List of primary Interstate Highways

Dwight D. Eisenhower National System of Interstate and Defense Highways
Dwight D. Eisenhower National System of Interstate and Defense Highways
	Highway shield for Interstate 90 and the Eisenhower Interstate System
	Primary Interstate Highways in the 48 contiguous states as of 2024
System information
Formed	June 29, 1956
Highway names
Interstates	Interstate X (I-X)
System links
	Interstate Highway System; Main; Auxiliary; Suffixed; Business; Future;

There are 71 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, even-numbered Interstates run east–west, with lower numbers in the south and higher numbers in the north; odd-numbered Interstates run north–south, with lower numbers in the west and higher numbers in the east. Route numbers divisible by 5 usually represent major coast-to-coast or border-to-border routes (ex. I-10 connects Santa Monica, California to Jacksonville, Florida, extending between the Pacific and Atlantic oceans). Auxiliary highways have an added digit prefixing the number of the parent highway.

Five route numbers are duplicated in the system; the corresponding highways are in different regions, reducing potential confusion. In addition to primary highways in the contiguous United States, there are signed Interstates in Hawaii and unsigned Interstates in Alaska and Puerto Rico.

Contiguous United States

There are 71 primary interstate highways in the 48 contiguous United States as well as five former and one future primary interstate highway. This number does not include auxiliary Interstate Highways.


Number	Length (mi)^[2]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
I-2	46.80	75.32	US 83/Bus. US 83-S in La Joya, TX	I-69E/US 77/US 83 in Harlingen, TX	02013-01-012013	current	Unfinished in Texas; Texas only
I-4	132.30	212.92	I-275 in Tampa, FL	I-95/SR 400 at Daytona Beach, FL	01959-01-011959	current	Florida only
I-5	1,381.29	2,222.97	Fed. 1/Fed. 1D at San Diego, CA	Highway 99 at Blaine, WA	01956-01-011956	current	Serves three states: California, Oregon, Washington Associated routes: I-105, I-205, I-305, I-405, I-505, I-605, I-705, I-805; Planned: I-905 in California
I-8	350.34	563.82	Sunset Cliffs Boulevard/Nimitz Boulevard in San Diego, CA	I-10 in Casa Grande, AZ	01964-01-011964	current	Serves two states: California, Arizona
I-10	2,460.34	3,959.53	SR 1 in Santa Monica, CA	I-95/US 17 in Jacksonville, FL	01957-01-011957	current	Serves eight states: California, Arizona, New Mexico, Texas, Louisiana, Mississippi, Alabama, Florida Associated routes: I-110, I-210, I-310, I-410, I-510, I-610, I-710, I-910
I-11	54.193	87.215	US 93 at the Arizona state line	Future I-11/US 95/SR 157 in Las Vegas, NV	02017-01-012017	current	Unfinished in Nevada; Nevada only; planned in one more: Arizona
I-12	85.59	137.74	I-10 in Baton Rouge, LA	I-10/I-59 in Slidell, LA	01967-01-011967	current	Louisiana only
I-14	25.10	40.39	US 190/US 190 Bus. in Copperas Cove, TX	I-35/US 190 in Belton, TX	02017-01-262017	current	Unfinished in Texas; Texas only; planned in four more: Louisiana, Mississippi, Alabama, Georgia Planned associated routes: I-14N, I-14S, and I-214 in Texas
I-15	1,433.52	2,307.03	I-8/SR 15 in San Diego, CA	Highway 4 at Sweetgrass, MT	01957-01-011957	current	Unfinished in California; serves six states: California, Nevada, Arizona, Utah, Idaho, Montana Associated routes: I-115, I-215, I-315
I-16	166.81	268.45	I-75/SR 540 in Macon, GA	Montgomery Street in Savannah, GA	01966-01-011966	current	Georgia only Associated route: I-516
I-17	145.93	234.85	I-10/US 60 in Phoenix, AZ	I-40/SR 89A in Flagstaff, AZ	01961-01-011961	current	Arizona only
I-19	63.43	102.08	I-19 BL in Nogales, AZ	I-10 in Tucson, AZ	01972-01-011972	current	Arizona only Uses kilometers instead of miles
I-20	1,539.38	2,477.39	I-10 in Reeves County, TX	I-95 & I-20 Bus. in Florence, SC	01957-01-011957	current	Serves six states: Texas, Louisiana, Mississippi, Alabama, Georgia, South Carolina Associated routes: I-220, I-520, I-820
I-22	202.22	325.44	I-269/US 78/MS 304 in Byhalia, MS	I-65 in Birmingham, AL	02012-01-012012	current	Unfinished in Alabama; serves two states: Mississippi, Alabama Planned associated routes: I-222 and I-422 in Alabama
I-24	316.36	509.13	I-57 in Pulley's Mill, IL	I-75/US 74 in East Ridge, TN	01962-01-011962	current	Serves four states: Illinois, Kentucky, Tennessee, Georgia Associated route: I-124
I-25	1,061.67	1,708.59	I-10/US 85/US 180 in Las Cruces, NM	I-90/US 87 in Buffalo, WY	01957-01-011957	current	Serves three states: New Mexico, Colorado, Wyoming Associated route: I-225
I-26	328.09	528.01	US 11W/US 23 in Kingsport, TN I-40/I-240/US 74 in Asheville, NC	US 19/US 23 south of Forks of Ivy, NC US 17 in Charleston, SC	01960-01-011960	current	Unfinished in North Carolina; serves three states: Tennessee, North Carolina, South Carolina Associated routes: I-126, I-526
I-27	128.332	206.530	US 87 in Lubbock, TX	I-40/US 60/US 87/US 287 in Amarillo, TX	01969-01-011969	current	Unfinished in Texas; Texas only; planned in one more: New Mexico; Planned associated routes in Texas: I-27E, I-27W, I-27N^[3]
I-29	750.58	1,207.94	I-35/I-70/US 24/US 40/US 71 in Kansas City, MO	PTH 75 at Pembina, ND	01958-01-011958	current	Serves four states: Missouri, Iowa, South Dakota, North Dakota Associated routes: I-129, I-229
I-30	366.76	590.24	I-20 northeast of Aledo, TX	I-40/US 65/US 67/US 167/AR 107 in North Little Rock, AR	01957-01-011957	current	Serves two states: Texas, Arkansas Associated routes: I-430, I-530, I-630
I-31	—	—	I-94 in Fargo, ND	US 81 & PTH 75 at Pembina, ND	01957-01-011957	01958-01-011958	Served North Dakota only Replaced by a northward extension of I-29
I-35	1,569.06	2,525.16	US 83 in Laredo, TX I-35W & I-35E in Denton, TX I-35W & I-35E in Columbus, MN	I-35W & I-35E in Hillsboro, TX I-35W & I-35E in Burnsville, MN MN 61 in Duluth, MN	01956-01-011956	current	Serves six states: Texas, Oklahoma, Kansas, Missouri, Iowa, Minnesota Associated routes: I-35E, I-35W, I-135, I-235, I-335, I-435, I-535, I-635
I-37	143.00	230.14	US 181/SH 35 in Corpus Christi, TX	I-35/US 281 in San Antonio, TX	01959-01-011959	current	Texas only
I-39	306.14	492.68	I-55/US 51 in Normal, IL	US 51/WIS 29 west of Rothschild, WI	01984-01-011984	current	Serves two states: Illinois, Wisconsin
I-40	2,556.61	4,114.46	I-15 in Barstow, CA	US 117 in Wilmington, NC	01957-01-011957	current	Serves eight states: California, Arizona, New Mexico, Texas, Oklahoma, Arkansas, Tennessee, North Carolina Associated routes: I-140, I-240, I-440, I-540, I-640, I-840
I-41	175.00	281.64	I-94/US 41 in Russell, IL	I-43/US 41/US 141 in Howard, WI	02015-01-012015	current	Serves two states: Illinois, Wisconsin
I-42	190	310	I-35 in Noble County, OK	I-49 in Springdale, AR	proposed	—	Future Interstate; will serve two states: Oklahoma, Arkansas
I-42	31.5	50.7	I-40/NC 540 southeast of Garner, NC US 70 in Goldsboro, NC	US 70/US 70 Bus. southeast of Clayton, NC US 70 in La Grange, NC	02024-01-012024	current	Unfinished in North Carolina; North Carolina only
I-43	191.55	308.27	I-39/I-90 in Beloit, WI	I-41/US 41/US 141 in Howard, WI	01981-01-011981	current	Wisconsin only
I-44	636.69	1,024.65	US 82/US 277/US 281/US 287 in Wichita Falls, TX	I-70 in St. Louis, MO	01958-01-011958	current	Serves three states: Texas, Oklahoma, Missouri Associated routes: I-244, I-344, I-444
I-45	284.91	458.52	SH 87/Spur 342 in Galveston, TX	I-30/I-345/US 67 in Dallas, TX	01971-01-011971	current	Texas only Associated route: I-345
I-49	547.52	881.15	I-10/US 167/LA 182 in Lafayette, LA I-220 in Shreveport, LA I-40/US 71 at Alma, AR	I-20 in Shreveport, LA US 59/US 71 in Texarkana, AR I-435/I-470/US 50/US 71 in Kansas City, MO	01984-01-011984	current	Unfinished in Arkansas and Louisiana; serves three states: Louisiana, Arkansas, Missouri; planned in one more: Texas
I-55	964.25	1,551.81	I-10 in LaPlace, LA	US 41 in Chicago, IL	01960-01-011960	current	Serves six states: Louisiana, Mississippi, Tennessee, Arkansas, Missouri, Illinois Associated routes: I-155, I-255, I-355, I-555
I-57	508.92	819.03	I-40/US 67/US 167 in North Little Rock, AR I-55/US 60 in Sikeston, MO	US 67/US 412/US 412B in Walnut Ridge, AR I-94 in Chicago, IL	01965-01-011965	current	Unfinished in Missouri and Arkansas; serves three states: Arkansas, Missouri, Illinois.
I-59	445.23	716.53	I-10/I-12 in Slidell, LA	I-24 in Wildwood, GA	01960-01-011960	current	Serves four states: Louisiana, Mississippi, Alabama, Georgia Associated routes: I-359, I-459, I-759
I-64	963.52	1,550.64	I-70/US 40/US 61 in Wentzville, MO	I-264/I-664/US 13/US 58/US 460 in Chesapeake, VA	01961-01-011961	current	Serves six states: Missouri, Illinois, Indiana, Kentucky, West Virginia, Virginia Associated routes: I-264, I-464, I-564, I-664
I-65	887.30	1,427.97	I-10 in Mobile, AL	US 12/US 20 in Gary, IN	01958-01-011958	current	Serves four states: Alabama, Tennessee, Kentucky, Indiana Associated routes: I-165, I-265, I-465, I-565, I-865; Planned: I-365 in Kentucky
I-66	—	—	Wichita, KS	Near Pikeville, KY	01991-01-011991	02015-01-012015^[4]	Served four states: Kansas, Missouri, Illinois, Kentucky Associated routes: I-66 Spur in Kentucky The project was unpopular and ultimately cancelled without the interstate being completed; I-66 Spur eventually became I-165
I-66	76.28	122.76	I-81 southwest of Middletown, VA	US 29 in Washington, D.C.	01961-01-011961	current	Serves DC and one state: Virginia
I-68	113.15	182.10	I-79 in Morgantown, WV	I-70/US 40/US 522 in Hancock, MD	01991-01-011991	current	Serves two states: West Virginia, Maryland
I-69	910.10	1,464.66	US 59 in Rosenberg, TX MS 713 southwest of Banks, MS US 51 in Fulton, KY US 41 in Evansville, IN	US 59 in Splendora, TX US 51 in Memphis, TN US 41 in Henderson, KY Hwy 402 at Port Huron, MI	01957-01-011957	current	Unfinished in Texas, Mississippi, Tennessee, Kentucky, and Indiana; serves six states: Texas, Mississippi, Tennessee, Kentucky, Indiana, Michigan Planned/started in 2 more: Louisiana, Arkansas Associated routes: I-69C, I-69E, I-69W, I-169, I-269, I-369, I-469; Planned: I-569 in Kentucky
I-70	2,171.71	3,495.03	I-15 in Cove Fort, UT	I-695 in Woodlawn, MD	01956-01-011956	current	Serves 10 states: Utah, Colorado, Kansas, Missouri, Illinois, Indiana, Ohio, West Virginia, Pennsylvania, Maryland Associated routes: I-170, I-270, I-370, I-470, I-670
I-71	345.57	556.14	I-64/I-65 in Louisville, KY	I-90 & I-490 in Cleveland, OH	01959-01-011959	current	Serves two states: Kentucky, Ohio Associated routes: I-271, I-471
I-72	179.29	288.54	US 36/US 36 Bus./US 61 (Avenue of the Saints)/Route 110 (CKC) in Hannibal, MO	University Avenue & Church Street in Champaign, IL	01970-01-011970	current	Serves two states: Missouri, Illinois Associated route: I-172
I-73	101.10	162.70	I‑74/US 74/US 74 Bus. west of Rockingham, NC	US 220/NC 68 northeast of Stokesdale, NC	01997-01-011997	current	Unfinished in North Carolina; North Carolina only; planned in five more: South Carolina, Virginia, West Virginia, Ohio, Michigan
I-74	541.62	871.65	I-80 in Davenport, IA I-77 at the Virginia state line northwest of Pine Ridge, NC I-40 in Winston-Salem, NC US 74 Alt./US 74 Bus. in Maxton, NC	I-75/US 52 in Cincinnati, OH US 52 in Mount Airy, NC US 74 Bus. northwest of Hamlet, NC US 74 southwest of Lumberton, NC	01974-01-011974	current	Unfinished in Ohio and North Carolina; serves five states: Iowa, Illinois, Indiana, Ohio, North Carolina; planned in three more: West Virginia, Virginia, South Carolina Associated routes: I-474; Planned: I-274 in North Carolina
I-75	1,786.47	2,875.04	SR 826/SR 924 in Miami Lakes, FL	International Bridge at Sault Ste. Marie, MI	01958-01-011958	current	Serves six states: Florida, Georgia, Tennessee, Kentucky, Ohio, Michigan Associated routes: I-175, I-275, I-375, I-475, I-575, I-675
I-76	187.29	301.41	I-70 in Arvada, CO	I-80 at Big Springs, NE	01975-01-011975	current	Serves two states: Colorado, Nebraska
I-76	435.66	701.13	I-71/US 224 in Westfield Township, OH	I-295/Route 42 in Bellmawr, NJ	01964-01-011964	current	Serves three states: Ohio, Pennsylvania, New Jersey Associated routes: I-176, I-276, I-376, I-476, I-676
I-77	610.10	981.86	I-26 in Cayce, SC	I-90 in Cleveland, OH	01958-01-011958	current	Serves five states: South Carolina, North Carolina, Virginia, West Virginia, Ohio Associated route: I-277
I-78	146.28	235.41	I-81 in Union Township, PA	Canal Street in New York, NY	01957-01-011957	current	Serves three states: Pennsylvania, New Jersey, New York Associated routes: I-278, I-478, I-678, I-878
I-79	343.46	552.75	I-77 in Charleston, WV	PA 5/PA 290/Bayfront Parkway in Erie, PA	01967-01-011967	current	Serves two states: West Virginia, Pennsylvania Associated routes: I-279, I-579
I-80	2,900.76	4,668.32	US 101 in San Francisco, CA	I-95 in Teaneck, NJ	01956-01-011956	current	Serves 11 states: California, Nevada, Utah, Wyoming, Nebraska, Iowa, Illinois, Indiana, Ohio, Pennsylvania, New Jersey Associated routes: I-180, I-238, I-280, I-380, I-480, I-580, I-680, I-780, I-880, I-980
I-81	855.02	1,376.02	I-40 in Dandrige, TN	Hwy 137 at Wellesley Island, NY	01961-01-011961	current	Serves six states: Tennessee, Virginia, West Virginia, Maryland, Pennsylvania, New York Associated routes: I-381, I-481, I-581, I-781
I-82	143.58	231.07	I-90/US 97 in Ellensburg, WA	I-84/US 30 in Hermiston, OR	01957-01-011957	current	Serves two states: Washington, Oregon Associated route: I-182
I-82	—	—	I-81/I-84/US 6 in Scranton, PA	I-95 in Teaneck, NJ	01957-01-011957	01958-01-011958	Served two states: Pennsylvania, New Jersey Was the initial designation to what is now I-380 and I-80
I-82	—	—	I-84 in East Hartford, CT	Providence, RI	01956-01-011956	01968-01-011968	Served one state: Connecticut, was planned for one state: Rhode Island Redesignated as I-84 in 1968
I-83	85.03	136.84	President Street/Fayette Street in Baltimore, MD	I-81/US 322 north of Progress, PA	01959-01-011959	current	Serves two states: Maryland, Pennsylvania Associated route: I-283
I-84	769.62	1,238.58	I-5/US 30 in Portland, OR	I-80/US 189 in Echo, UT	01980-01-011980	current	Serves three states: Oregon, Idaho, Utah Associated route: I-184
I-84	232.71	374.51	I-81/I-380/US 6 in Dunmore, PA	I-90/Massachusetts Turnpike in Sturbridge, MA	01963-01-011963	current	Serves four states: Pennsylvania, New York, Connecticut, Massachusetts Associated routes: I-384, I-684
I-85	666.05	1,071.90	I-65/US 82 in Montgomery, AL	I-95/US 460 in Petersburg, VA	01958-01-011958	current	Unfinished in Alabama; serves five states: Alabama, Georgia, South Carolina, North Carolina, Virginia Associated routes: I-185, I-285, I-385, I-485, I-585, I-785, I-885, I-985; Future/Planned: I-685 in both Alabama and North Carolina
I-86	62.85	101.15	I-84/US 30 northeast of Declo, ID	I-15 in Chubbuck, ID	01980-01-011980	current	Idaho only
I-86	254.02	408.81	I-90 in Greenfield Township, PA I-81/NY 17/NY 990G in Kirkwood, NY	NY 17/NY 26 in Vestal, NY NY 17/NY 79 in Windsor, NY	01999-01-011999	current	Unfinished in New York; serves two states: Pennsylvania, New York
I-86	38.97	62.72	I-84 in East Hartford, CT	I-90 in Sturbridge, MA	01968-01-011968	01984-01-011984	Served two states: Connecticut, Massachusetts Redesignated as I-84 in 1984 when the I-84 Hartford-Providence corridor was cancelled
I-87	12.90	20.76	I-40/I-440/US 64 in Raleigh, NC	US 64/US 264 in Wendell, NC	02017-01-012017	current	Unfinished in North Carolina; North Carolina only; planned in one more: Virginia Associated route: I-587
I-87	333.49	536.70	I-278 in Port Morris, NY	A-15 at Champlain, NY	01957-01-011957	current	New York only Associated routes: I-287, I-587, I-787
I-88	140.60	226.27	I-80/IL 5/IL 92/Route 110 (CKC) northeast of East Moline, IL	I-290/Route 110 (CKC) in Hillsdale, IL	01987-01-011987	current	Illinois only
I-88	117.75	189.50	I-81 in Chenango, NY	I-90/New York State Thruway in Rotterdam, NY	01968-01-011968	current	New York only
I-89	191.12	307.58	I-93/Everett Turnpike/NH 3A in Bow, NH	Route 133 at Highgate, VT	01960-01-011960	current	Serves two states: New Hampshire, Vermont Associated route: I-189
I-90	3,099.74	4,988.55	SR 519 in Seattle, WA	Route 1A in Boston, MA	01956-01-011956	current	Serves 13 states: Washington, Idaho, Montana, Wyoming, South Dakota, Minnesota, Wisconsin, Illinois, Indiana, Ohio, Pennsylvania, New York, Massachusetts Associated routes: I-190, I-290, I-390, I-490, I-590, I-690, I-790, I-890, I-990 Longest Interstate highway
I-91	290.37	467.31	I-95 in New Haven, CT	A-55 at Derby Line, VT	01958-01-011958	current	Serves three states: Connecticut, Massachusetts, Vermont Associated routes: I-291, I-391, I-691
I-93	189.95	305.69	I-95/US 1/Route 128 in Canton, MA	I-91 in Waterford, VT	01957-01-011957	current	Serves three states: Massachusetts, New Hampshire, Vermont Associated routes: I-293, I-393
I-94	1,555.43	2,503.22	I-90/US 87/US 212 in Lockwood, MT	Highway 402 at Port Huron, MI	01956-01-011956	current	Serves seven states: Montana, North Dakota, Minnesota, Wisconsin, Illinois, Indiana, Michigan Associated routes: I-194, I-294, I-394, I-494, I-694, I-794, I-894
I-95	1,905.96	3,067.35	US 1 in Miami, FL	Route 95 at Houlton, ME	01957-01-011957	current	Serves DC and 15 states: Florida, Georgia, South Carolina, North Carolina, Virginia, Maryland, Delaware, Pennsylvania, New Jersey, New York, Connecticut, Rhode Island, Massachusetts, New Hampshire, Maine Associated routes: I-195, I-295, I-395, I-495, I-595, I-695, I-795, I-895 Longest primary north-south Interstate highway
I-96	192.032	309.046	US 31 in Norton Shores, MI	I-75 in Detroit, MI	01959-01-011959	current	Michigan only Associated routes: I-196, I-296, I-496, I-696
I-97	17.62	28.36	US 50/US 301 in Parole, MD	I-695/I-895A in Brooklyn Park, MD	01987-01-011987	current	Maryland only
I-99	161.68	260.20	US 220/US 220 Bus. north of Bedford, PA I-180/US 15/US 220 in Williamsport, PA	US 220/PA 26 northeast of Bellefonte, PA I-86/US 15/NY 17/NY 352 at Painted Post, NY	01998-01-011998	current	Unfinished in Pennsylvania; serves two states: Pennsylvania, New York
Former Proposed and unbuilt

Other regions

In addition to the 48 contiguous states, Interstate Highways are found in Hawaii, Alaska, and Puerto Rico. The Federal Highway Administration funds four routes in Alaska and three routes in Puerto Rico under the same program as the rest of the Interstate Highway System. However, these routes are not required to meet the same standards as the mainland routes:

Highways on the Interstate System in Alaska and Puerto Rico shall be designed in accordance with such geometric and construction standards as are adequate for current and probable future traffic demands and the needs of the locality of the highway.^[5]

Hawaii

Map of Hawaii's Interstate Highways (excluding H-201)

The Interstate Highways on the island of Oʻahu, Hawaii are signed with the standard Interstate Highway shield, with the letter "H-" prefixed before the number. They are fully controlled-access routes built to the same standards as the mainland Interstate Highways.


Number	Length (mi)^[2]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
H-1	27.16	43.71	Route 93 in Kapolei	Route 72 in Honolulu	01960-01-011960	current	Associated route: H-201
H-2	8.33	13.41	H-1 in Pearl City	Route 99 in Wahiawa	01960-01-011960	current
H-3	15.32	24.66	H-1/H-201 in Halawa	Marine Corps Base Hawaii	01997-01-011997	current

Alaska

Map of Alaska's Interstate Highways

Alaska's Interstate Highways are unsigned as such, although they all have state highway numbers that do not match the Interstate Highway numbers.^[6]


Number	Length (mi)^[2]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
A-1	408.23	656.98	Anchorage	Hwy. 1 at Alcan Border	01976-01-011976	current	Glenn Highway, Richardson Highway, Tok Cut-Off, Alaska Highway^[7]^[8]^[9]^[10]
A-2	202.18	325.38	Tok	Fairbanks	01976-01-011976	current	Alaska Highway, Richardson Highway^[8]^[9]^[10]
A-3	148.12	238.38	Anchorage	Soldotna	01976-01-011976	current	Seward Highway, Sterling Highway^[7]^[9]^[10]
A-4	323.69	520.93	Gateway, near Palmer	Fairbanks	01976-01-011976	current	Parks Highway^[7]^[8]^[9]^[10]

Puerto Rico

Map of the Interstates in Puerto Rico

Puerto Rico signs its Interstate Highways as territorial routes, as the numbers do not match their official Interstate Highway designations. Many of the territory's routes are freeway-standard toll roads.^[11]


Number	Length (mi)^[2]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
PR-1	71.08	114.39	PR-2 in Ponce	PR-2 in San Juan	01976-01-011976	current	Follows PR-52
PR-2	138.13	222.30	PR-1 in Ponce	PR-3 in San Juan	01976-01-011976	current	Follows PR-22
PR-3	40.56	65.27	PR-3 in Humacao	PR-2 in San Juan	01976-01-011976	current	Follows PR-66

References

^ Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. 60 (1). Washington, DC: Federal Highway Administration. Archived from the original on September 23, 2021. Retrieved March 16, 2012.
^ ^a ^b ^c ^d "Table 1: Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways as of December 31, 2018". FHWA Route Log and Finder List. Federal Highway Administration. May 6, 2019. Retrieved April 21, 2021.
^ United States Congress (March 22, 2024). "Text - S.992 - 118th Congress (2023-2024): I-27 Numbering Act of 2023". Congress.gov. Library of Congress. Retrieved February 21, 2025.
^ Nelsen, Carrie (July 9, 2015). "For Immediate Release" (PDF) (Press release). Illinois Department of Transportation. Archived from the original (PDF) on September 6, 2015.
^ Staff. "FHWA Route Log and Finder List". Federal Highway Administration. Retrieved May 24, 2007.
^ Voss, Oscar. "Alaska Roads: Interstate ends photos". Retrieved May 24, 2007.
^ ^a ^b ^c Witt, Jennifer W. (2010). Annual Traffic Volume Report (PDF) (Report) (2008-2009-2010 ed.). Alaska Department of Transportation & Public Facilities. Archived from the original (PDF) on March 30, 2014. Retrieved March 15, 2012.
^ ^a ^b ^c Birkholz, Ethan (2010). Annual Traffic Volume Report (PDF) (Report) (2008-2009-2010 ed.). Alaska Department of Transportation & Public Facilities. Archived from the original (PDF) on April 17, 2014. Retrieved May 31, 2012.
^ ^a ^b ^c ^d Staff. "Dwight D. Eisenhower Interstate Routes Statewide" (PDF). Federal Highway Administration. Archived from the original (PDF) on April 17, 2014. Retrieved May 31, 2012.
^ ^a ^b ^c ^d Staff. "Alaska Department of Transportation and Public Facilities Routes by Description: CDS Route Numbers as of 28 October 2008" (PDF). Federal Highway Administration. Archived from the original (PDF) on April 17, 2014. Retrieved May 31, 2012.
^ Voss, Oscar. "Puerto Rico road photos". Retrieved May 24, 2007.

External links

[FAHA56-1] Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads. 60 (1). Washington, DC: Federal Highway Administration. Archived from the original on September 23, 2021. Retrieved March 16, 2012.

[table1-2] "Table 1: Main Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways as of December 31, 2018". FHWA Route Log and Finder List. Federal Highway Administration. May 6, 2019. Retrieved April 21, 2021.

[3] United States Congress (March 22, 2024). "Text - S.992 - 118th Congress (2023-2024): I-27 Numbering Act of 2023". Congress.gov. Library of Congress. Retrieved February 21, 2025.

[4] Nelsen, Carrie (July 9, 2015). "For Immediate Release" (PDF) (Press release). Illinois Department of Transportation. Archived from the original (PDF) on September 6, 2015.

[5] Staff. "FHWA Route Log and Finder List". Federal Highway Administration. Retrieved May 24, 2007.

[6] Voss, Oscar. "Alaska Roads: Interstate ends photos". Retrieved May 24, 2007.

[AADT_Central-7] Witt, Jennifer W. (2010). Annual Traffic Volume Report (PDF) (Report) (2008-2009-2010 ed.). Alaska Department of Transportation & Public Facilities. Archived from the original (PDF) on March 30, 2014. Retrieved March 15, 2012.

[AADT_North-8] Birkholz, Ethan (2010). Annual Traffic Volume Report (PDF) (Report) (2008-2009-2010 ed.). Alaska Department of Transportation & Public Facilities. Archived from the original (PDF) on April 17, 2014. Retrieved May 31, 2012.

[Interstate_Maps-9] Staff. "Dwight D. Eisenhower Interstate Routes Statewide" (PDF). Federal Highway Administration. Archived from the original (PDF) on April 17, 2014. Retrieved May 31, 2012.

[Interstate_List-10] Staff. "Alaska Department of Transportation and Public Facilities Routes by Description: CDS Route Numbers as of 28 October 2008" (PDF). Federal Highway Administration. Archived from the original (PDF) on April 17, 2014. Retrieved May 31, 2012.

[11] Voss, Oscar. "Puerto Rico road photos". Retrieved May 24, 2007.

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