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
305 CA West Sacramento Sacramento
910 LA Marrero New Orleans
315 MT Great Falls downtown Great Falls
124 TN Chattanooga Chattanooga
444 OK downtown Tulsa downtown Tulsa
345 TX downtown Dallas downtown Dallas
478 NY Brooklyn, NY Manhattan, NY
878 NY Queens/John F. Kennedy International Airport Queens
194 ND in Mandan Mandan
495 ME Portland Falmouth
595 MD Washington, DC Annapolis
296 MI Grand Rapids Grand Rapids
A-1 Anchorage Canadian Border - Yukon Territory
A-2 Tok Junction Fairbanks
A-3 Soldotna Anchorage
A-4 Palmer Fairbanks
PR-1 Ponce San Juan
PR-2 Ponce San Juan
PR-3 Ceiba 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.