Additional Info

Official Route Numbering for the National System of Interstate and Defense Highways adopted by the American Association of State Highway Officials in August 1957.
Some notable changes from the original system envisioned by transportation officials include:
  • Interstate 31 in North Dakota was renumbered as part of an extended Interstate 29
  • Interstate 67 between Elkhart and Lansing was never built
  • Interstate 77 from Detroit to Port Huron became the easternmost extent of Interstate 94
  • Interstate 78 between Norwalk, Ohio and Youngstown was supplanted by the corridors of Interstate 80 and 80S (later I-76)
  • Interstate 79 between Canton and Cleveland, Ohio was renumberd as Interstate 77
  • Interstate 80 from Youngstown southeast to Harrisburg was later changed to I-80N and ultimately I-76. The I-80N/S split east from Harrisburg now carries I-78 and I-76 respectively.
  • Interstate 82 from Portland to Idaho was redesignated as Interstate 80N. I-82N in Idaho was later I-15W and today is I-86
  • Interstate 82 between Scranton and New York became I-81E (now I-380) and part of new I-80.
  • Interstate 84 across northern Pennsylvania was dropped in favor of a southern alignment for new Interstate 80
  • Interstate 90N between Buffalo and Niagara Falls became Interstate 190
  • Interstate 92 in Michigan was renumbered as the new alignment of I-94, with planned I-94 being replaced by I-96.
  • Interstate 94N in Michigan became Interstate 196 and later the westernmost extent of I-96
  • Interstate 95E from Providence to New Beford changed to Interstate 195
Birmingham, Alabama - 1960.
Interstate 59B was the proposed number for the Birmingham belt line (Interstate 459) in the early days of the Interstate System.
Topeka, Kansas - 1960.
This Topeka, Kansas inset from 1960 shows Interstate 70 Bypass for what is now Interstate 470 bypassing the capital city to the south. Note also the error I-35 shield posted for the Kansas Turnpike (now I-335). Interstate 35 was never envisioned for this stretch of the turnpike.


Decommissioned Interstates

This set of Interstates includes those that were either signed at one point and legislatively decommissioned, renumbered as another Interstate, or planned and subsequently canceled. As planning documents arise either through library research, the internet, or other sources, expansion of the list below will occur with this information and photos as they are taken.

The following code indicates whether the Interstate was Dismantled (D); Partially Completed (P); Renumbered as another Interstate or freeway designation, U.S., or State Route (R); Unconstructed (U); or Numbering Proposed but Not Approved by AASHTO (N).

Interstate South/West Terminus North/East Terminus Code Current Designation
5W CA Vernalis Dunnigan R I-580, I-80, I-505
105 CA se of Downtown Los Angeles east of Downtown Los Angeles R US 101
305 OR Salem Keizer R I-305*
505 OR Portland Portland P
110 CA east of Downtown Los Angeles east of Downtown Los Angeles R no #
210 AL Mobile Prichard P
410 AZ se of Downtown Phoenix east of Downtown Phoenix R I-10
410 LA west of Port Allen Walker R, P I-110
410 LA Kenner New Orleans East R, P I-310, I-510
510 AZ se of Downtown Phoenix east of Downtown Phoenix R I-410
710 AZ south Tuscon east of Downtown Tuscon U Kino Pkwy
15E CA Murrieta Devore R I-215
15W ID Heyburn Pocatello R I-86
415 UT Murray East Millcreek R I-215
420 GA Atlanta Gresham Park U
420 LA Monroe Bypass U
326 SC Interstate 26 near Columbia South Carolina 48 R I-77
130 AR south of Texarkana Texarkana R I-49
31 ND Fargo Pembina R I-29
35W KS Wichita Salina R I-135
335 MN Minneapolis - Urban Loop U
340 NC Sanford Raleigh N U.S. 1
440 OK Oklahoma City Oklahoma City R I-44
244 MO Mehlville Bridgeton R I-270
255 TN Memphis Downtown Memphis R I-240
455 IL Bolingbrook Itasca R I-355
755 MO north of downtown Saint Louis south of downtown Saint Louis P
164 IN Evansville near Elberfeld R I-69
165 IN Indianapolis Castleton U IN 37
265 TN Nashville Nashville R I-65
68 MD Glenarden west of Annapolis R I-595
168 MD west of Annapolis Annapolis R I-595
70A OH Columbus Columbus R I-670, OH 315, I-71
70N OH Columbus Columbus R I-670
70N MD Frederick Baltimore R I-70
70S MD Frederick Bethesda R I-270
70S PA Washington New Stanton R I-70
170 MD west of downtown Baltimore Downtown Baltimore R, P U.S. 40
470 CO Golden Centennial R C-470
172 IL Quincy Springfield R I-72
174 IL, IA Moline, IL Bettendorf, IA N
274 IL, IA I-74/80 near Coloma, IL NW of Davenport, IA R I-280
75E FL Ellenton Lutz R I-75
175 GA Albany Cordele R GA 300*
475 GA Stockbridge Atlanta R I-675, GA 400
475 TN Interstate 40/75 Interstate 75 U --
178 PA Downtown Allentown Hanover Township U --
378 PA Downtown Bethlehem northern Bethlehem R PA 378
478 NY Brooklyn Manhattan P  
878 NY Bronx Bronx R I-278
80N OR, ID, UT Portland Echo Junction R I-84
80N IA Loveland Minden R I-680
80N OH Norwalk Youngstown P
80S CO, NE Denver, CO Big Springs, NE R I-76
80S OH, PA, NJ Norwalk, OH Camden, NJ R I-76
180N ID Boise Downtown Boise R I-184
180 CA San Rafael Richmond R I-580
180 PA Morgantown Reading R I-176
280 NE, IA Omaha Council Bluffs R I-680
280 PA King of Prussia Bristol R I-276
480 CA western San Francisco eastern San Francisco D
480 PA Chester Plymouth Meeting R I-476
580 NE Omaha northern Omaha R U.S. 75
680 NJ/PA Downtown Philadelphia Camden R I-76, I-676
880 CA West Sacramento Sacramento R I-80
81E PA Pocono Summit Scranton R I-380
181 TN Colonial Heights Kingsport R I-26
281 NY Syracuse Bypass R I-481
184 RI Providence Cranston R
284 CT East Hartford South Windsor P
484 CT Downtown Hartford Downtown Hartford P
185 NC Lexington Winston-Salem N I-285
485 GA Downtown Atlanta Clarkston P
86 CT, MA Wethersfield Sturbridge R I-84
487 NY Elmsford Rye R I-287
687 NY I-87 north of Albany I-90 Albany U
90N NY Buffalo Niagara Falls P I-190
289 VT north of Burlington Williston
290 OH Cleveland R, U I-490
193 NH Bedford Manchester R I-293
494 IL Chicago - Lake Shore Drive, Crosstown Expressway R, U U.S. 41*
95E RI/MA Providence Bedford R I-195
195 NC Fayetteville Loop N I-295
395 NJ/PA Bellmawr Philadelphia R I-76
495 NJ/NY Secaucus, NJ Manhattan, NY R NJ 495
595 MD sw of Downtown Baltimore Lexington, Baltimore U  
595 VA Washington National Airport Arlington, VA P U.S. 1*, VA-233
695 MA Boston Inner Belt U
695 NJ connection from unbuilt I-95 to I-287 north U
695 PA I-95 south Philadelphia I-76 Philadelphia U
895 DE Newport Claymont R I-95
895 NJ, PA Springside, NJ West Bristol, PA U
895 MA vicinity of Swansea Attleboro, MA U
895 RI Warwick Swansea U
197 MD west of Annapolis Annapolis R I-168
297 MD Bowie Millersville U

* = Route built to expressway/parkway/boulevard standards rather than Interstate standards (controlled access).

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