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List of suffixed Interstate Highways

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Title: List of suffixed Interstate Highways  
Author: World Heritage Encyclopedia
Language: English
Subject: Interstate 82, Interstate Highway System, Interstate 35, Infobox road/testcases, List of business routes of the Interstate Highway System
Collection: Interstate Highway System
Publisher: World Heritage Encyclopedia

List of suffixed Interstate Highways

Dwight D. Eisenhower National System of Interstate and Defense Highways
The 1958 Interstate Highway System plan included many suffixed Interstates.
System information
Formed: June 29, 1956[1]
Highway names
Interstates: Interstate X (I-X)
System links

Currently the Interstate Highway System includes seven suffixed routes that are signed: the Interstate 35 split into Interstate 35E and Interstate 35W at Dallas-Fort Worth, Texas; a similar split into Interstate 35E and Interstate 35W at Minneapolis-St. Paul, Minnesota; as well as Interstate 69C, Interstate 69E and Interstate 69W in South Texas; in addition, Interstate 480N in Ohio exists and is designated as such on mile markers and exit/entrance ramp signs, but is otherwise unsigned. However, there were once many more, as the three-digit Interstates were not designated until after all major routes were assigned numbers, including some short connections and spurs. (A few of the shortest, including I-190 and I-195, were assigned three-digit numbers almost immediately.) Most were not equal splits like on I-35, but had the main route continue through, and often the suffixed route never returned to its parent. In 1980, AASHTO abolished the majority of suffixes due to confusion, renumbering them as three-digit Interstates, but several that return to their parents were kept. Interstate 15E has since become Interstate 215, but both I-35E/I-35W and I-69 splits still exist.


  • List of suffixed Interstates 1
    • Current routes 1.1
    • Former routes 1.2
  • References 2

List of suffixed Interstates

Current routes

Interstate Extent
Hillsboro, Texas (I-35) to Denton, Texas (I-35)
Burnsville, Minnesota (I-35) to Forest Lake, Minnesota (I-35)
Mexican border to Victoria, Texas (I-69/US 59, Incomplete, does not connect to I-69. Will connect to I-69 in the future.)
I-480N Warrensville Heights, Ohio (I-480 to I-271) via North Randall, Ohio; unsigned

Former routes

Interstate Extent Notes
Tracy, California (I-5) to Dunnigan, California (I-5) In the 1958 plan; I-5E changed to I-5 and I-5W to I-580, I-80 and I-505 in 1964
I-15E Temecula, California (I-15) to Devore, California (I-15) Renumbered from I-215 in 1973 and back to I-215 in 1982
I-15W Pocatello, Idaho (I-15) to Rupert, Idaho (I-80N) In the 1958 plan; became I-86 in 1980
I-24W Jackson, Tennessee (I-40) to Hayti, Missouri (I-55) Did not connect to I-24; renumbered I-155 in 1964
I-35W Wichita, Kansas (I-35) to Salina, Kansas (I-70) In the 1958 plan; renumbered I-135 in 1976[2]
I-59B Bypass for I-59 around Birmingham, Alabama Renumbered I-459
I-70S Washington, Pennsylvania (I-70) to New Stanton, Pennsylvania (I-70/I-80S) In the 1958 plan; became part of I-70 and former I-70 became parts of I-79 and I-76 in 1964
Frederick, Maryland (I-70) to Washington, DC (I-66/I-95) and Baltimore, Maryland (I-83/I-95) In the 1958 plan; became I-270 and I-70 in 1973
I-75E Bypass for I-75 around Tampa-St. Petersburg, Florida Renumbered I-275 in 1973, and swapped with I-75 in 1980
I-80N Echo, Utah (I-80) to Portland, Oregon (I-5) In the 1958 plan; became I-84 in 1980
I-180N Spur from I-80N to Boise, Idaho This was the only suffixed three-digit Interstate (Until I-480N In ohio was designated); all other spurs of suffixed routes had no suffix; became I-184 in 1980
I-80S Big Springs, Nebraska (I-80) to Denver, Colorado (I-25/I-70) In the 1958 plan; became I-76 in 1980
I-80N Neola, Iowa (I-80) to Loveland, Iowa (I-29) Became part of I-680 in 1973
I-80N Norwalk, Ohio (I-80/I-90) to Edinburg, Ohio (I-80) In the 1958 plan; became part of I-80 by 1962
I-80S Youngstown, Ohio (I-80) to Camden, New Jersey (I-295) Extended west to Lodi, Ohio by 1962 over former I-80; east end truncated to Monroeville, Pennsylvania and the part east of Monroeville renumbered I-76 in 1964; the rest became part of I-76 in 1970
I-81E Scranton, Pennsylvania (I-81) to Scotrun, Pennsylvania (I-80) In the 1958 plan; became I-380 ca. 1973


  1. ^ Weingroff, Richard F. (Summer 1996). "Federal-Aid Highway Act of 1956, Creating the Interstate System". Public Roads (Washington, DC:  
  2. ^ "1970s". Kansas Celebrates 50 Years of Interstates. Kansas Department of Transportation. Retrieved 2013-07-16. 
  • misc.transport.road Frequently Asked Questions - What are/were all the suffixed interstates?
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