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Unsigned/Secret Interstates

These routes are officially part of the Eisenhower Interstate System, Yet are official essentially only on paper or internal documentation as no shields or other signage of their existance is posted. Additionally they are federally maintained and adhere to the standards of any other signed Interstate highway.

In many cases an Interstate is unsigned as to not confuse or overburden motorists with an additional number on an already signed route. This occurs in Maryland with the segment of Interstate 595 as it is already known as U.S. 50 and U.S. 301.

Interstate South/West Terminus North/East Terminus
305CAWest SacramentoSacramento
910LAMarreroNew Orleans
315MTGreat Fallsdowntown Great Falls
444OKdowntown Tulsadowntown Tulsa
345TXdowntown Dallasdowntown Dallas
478NYBrooklyn, NYManhattan, NY
878NYQueens/John F. Kennedy International AirportQueens
194NDin MandanMandan
595MDWashington, DCAnnapolis
296MIGrand RapidsGrand Rapids
A-1Anchorage Canadian Border - Yukon Territory
A-2Tok Junction Fairbanks
A-3Soldotna Anchorage
A-4Palmer Fairbanks
PR-1Ponce San Juan
PR-2Ponce San Juan
PR-3Ceiba San Juan

* - photos of historical terminus included

Page Updated January 18, 2012.

Interstate 80 westbound at U.S. 83 in Nebraska. Photo taken 09/05/05.
Nebraska was the first state to complete its Interstate system. Find more Interstate facts on the All About Interstates page.
Crossing the Columbia River on Interstate 5 north. Photo taken 08/27/06.
This bridge is one of a handful of draw bridges on the Interstate system. Find more Interstate facts on the All About Interstates page.
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