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The new boundaries of the numbering plan areas are drawn in a manner that minimizes splitting communities and should coincide with political subdivision where practical.<ref name="notes1975" /> Other geographic features, such as rivers and bodies of water, mountain ranges, or highways may serve as guides for boundary placements. Tributary toll telephone routes should not be unduly cut, so prevent rerouting to new toll center switching systems.
The area that retains the existing area code is typically the largest, or historically more established or developed place, but locations of large government bodies or other criteria may
==Area code overlays==
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