List of primary Interstate Highways: Difference between revisions
imported>Imzadi1979 Undid revision 1322407151 by ~2025-33740-46 (talk); not far enough along in any of those proposals to be listed here |
imported>Bneu2013 →Contiguous United States: add est refs - will add more |
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| terminus_a = [[Interstate 275 (Florida)|I-275]] in [[Tampa, Florida|Tampa, FL]] | | terminus_a = [[Interstate 275 (Florida)|I-275]] in [[Tampa, Florida|Tampa, FL]] | ||
| terminus_b = [[#I0095|I-95]]/[[Florida State Road 400|SR 400]] at [[Daytona Beach, Florida|Daytona Beach, FL]] | | terminus_b = [[#I0095|I-95]]/[[Florida State Road 400|SR 400]] at [[Daytona Beach, Florida|Daytona Beach, FL]] | ||
| established = | | established = 1957 | ||
| established_ref = <ref name="AASHO-1957">{{cite map |author = Public Roads Administration |author-link = Public Roads Administration |date = August 14, 1957 |title = Official Route Numbering for the National System of Interstate and Defense Highways as Adopted by the American Association of State Highway Officials |url = https://commons.wikimedia.org/wiki/File:Interstate_Highway_plan_August_14,_1957.jpg |location = Washington, DC |publisher = Public Roads Administration |access-date = June 14, 2018 |via = [[Wikimedia Commons]] |archive-date = July 19, 2017 |archive-url = https://web.archive.org/web/20170719213034/https://commons.wikimedia.org/wiki/File:Interstate_Highway_plan_August_14,_1957.jpg |url-status = live }}</ref> | |||
| notes = Florida only | | notes = Florida only | ||
| state = | | state = | ||
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| terminus_a = [[Mexican Federal Highway 1|Fed. 1]]/[[Mexican Federal Highway 1D|Fed. 1D]] at [[San Diego|San Diego, CA]] | | terminus_a = [[Mexican Federal Highway 1|Fed. 1]]/[[Mexican Federal Highway 1D|Fed. 1D]] at [[San Diego|San Diego, CA]] | ||
| terminus_b = [[British Columbia Highway 99|Highway 99]] at [[Blaine, Washington|Blaine, WA]] | | terminus_b = [[British Columbia Highway 99|Highway 99]] at [[Blaine, Washington|Blaine, WA]] | ||
| established = | | established = 1957 | ||
| established_ref = <ref name="AASHO-1957"/> | |||
| notes = Serves three states: [[Interstate 5 in California|California]], [[Interstate 5 in Oregon|Oregon]], [[Interstate 5 in Washington|Washington]]<br />Associated routes: [[Interstate 105 (disambiguation)|I-105]], [[Interstate 205 (disambiguation)|I-205]], [[Interstate 305 (disambiguation)|I-305]], [[Interstate 405 (disambiguation)|I-405]], [[Interstate 505|I-505]], [[Interstate 605|I-605]], [[Interstate 705|I-705]], [[Interstate 805|I-805]]; Planned: [[California State Route 905|I-905 in California]] | | notes = Serves three states: [[Interstate 5 in California|California]], [[Interstate 5 in Oregon|Oregon]], [[Interstate 5 in Washington|Washington]]<br />Associated routes: [[Interstate 105 (disambiguation)|I-105]], [[Interstate 205 (disambiguation)|I-205]], [[Interstate 305 (disambiguation)|I-305]], [[Interstate 405 (disambiguation)|I-405]], [[Interstate 505|I-505]], [[Interstate 605|I-605]], [[Interstate 705|I-705]], [[Interstate 805|I-805]]; Planned: [[California State Route 905|I-905 in California]] | ||
| state = | | state = | ||
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| terminus_a = [[#I0035|I-35]]/[[#I0070|I-70]]/[[U.S. Route 24|US 24]]/[[U.S. Route 40|US 40]]/[[U.S. Route 71|US 71]] in [[Kansas City, Missouri|Kansas City, MO]] | | terminus_a = [[#I0035|I-35]]/[[#I0070|I-70]]/[[U.S. Route 24|US 24]]/[[U.S. Route 40|US 40]]/[[U.S. Route 71|US 71]] in [[Kansas City, Missouri|Kansas City, MO]] | ||
| terminus_b = [[Manitoba Highway 75|PTH 75]] at [[Pembina, North Dakota|Pembina, ND]] | | terminus_b = [[Manitoba Highway 75|PTH 75]] at [[Pembina, North Dakota|Pembina, ND]] | ||
| established = | | established = 1957 | ||
| notes = Serves four states: [[Interstate 29 in Missouri|Missouri]], [[Interstate 29 in Iowa|Iowa]], [[Interstate 29 in South Dakota|South Dakota]], [[Interstate 29 in North Dakota|North Dakota]]<br />Associated routes: [[Interstate 129|I-129]], [[Interstate 229 (disambiguation)|I-229]] | | notes = Serves four states: [[Interstate 29 in Missouri|Missouri]], [[Interstate 29 in Iowa|Iowa]], [[Interstate 29 in South Dakota|South Dakota]], [[Interstate 29 in North Dakota|North Dakota]]<br />Associated routes: [[Interstate 129|I-129]], [[Interstate 229 (disambiguation)|I-229]] | ||
| state = | | state = | ||
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| terminus_a = [[U.S. Route 82|US 82]]/[[U.S. Route 277|US 277]]/[[U.S. Route 281|US 281]]/[[U.S. Route 287|US 287]] in [[Wichita Falls, Texas|Wichita Falls, TX]] | | terminus_a = [[U.S. Route 82|US 82]]/[[U.S. Route 277|US 277]]/[[U.S. Route 281|US 281]]/[[U.S. Route 287|US 287]] in [[Wichita Falls, Texas|Wichita Falls, TX]] | ||
| terminus_b = [[#I0070|I-70]] in [[St. Louis, Missouri|St. Louis, MO]] | | terminus_b = [[#I0070|I-70]] in [[St. Louis, Missouri|St. Louis, MO]] | ||
| established = | | established = 1957 | ||
| notes = Serves three states: [[Interstate 44 in Texas|Texas]], [[Interstate 44 in Oklahoma|Oklahoma]], [[Interstate 44 in Missouri|Missouri]]<br />Associated routes: [[Interstate 244|I-244]], [[Interstate 344|I-344]], [[Interstate 444|I-444]] | | notes = Serves three states: [[Interstate 44 in Texas|Texas]], [[Interstate 44 in Oklahoma|Oklahoma]], [[Interstate 44 in Missouri|Missouri]]<br />Associated routes: [[Interstate 244|I-244]], [[Interstate 344|I-344]], [[Interstate 444|I-444]] | ||
| state = | | state = | ||
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| length_mi = 76.28 | | length_mi = 76.28 | ||
| terminus_a = [[#I0081|I-81]] southwest of [[Middletown, Virginia|Middletown, VA]] | | terminus_a = [[#I0081|I-81]] southwest of [[Middletown, Virginia|Middletown, VA]] | ||
| terminus_b = [[U.S. Route 29|US 29]] in [[Washington, | | terminus_b = [[U.S. Route 29|US 29]] in [[Washington, DC]] | ||
| established = 1961 | | established = 1961 | ||
| notes = Serves DC and one state: Virginia | | notes = Serves DC and one state: Virginia | ||
Latest revision as of 06:10, 23 December 2025
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There are 71 primary Interstate Highways in the Interstate Highway System, a network of freeways in the United States. These primary highways are assigned one- or two-digit route numbers, whereas their associated auxiliary Interstate Highways receive three-digit route numbers. Typically, even-numbered Interstates run east–west, with lower numbers in the south and higher numbers in the north; odd-numbered Interstates run north–south, with lower numbers in the west and higher numbers in the east. Route numbers divisible by 5 usually represent major coast-to-coast or border-to-border routes (ex. I-10 connects Santa Monica, California to Jacksonville, Florida, extending between the Pacific and Atlantic oceans). Auxiliary highways have an added digit prefixing the number of the parent highway.
Five route numbers are duplicated in the system; the corresponding highways are in different regions, reducing potential confusion. In addition to primary highways in the contiguous United States, there are signed Interstates in Hawaii and unsigned Interstates in Alaska and Puerto Rico. Template:TOClimit
Contiguous United States
There are 71 primary interstate highways in the 48 contiguous United States as well as five former and one future primary interstate highway. This number does not include auxiliary Interstate Highways. Template:Routelist top Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist bottom
Other regions
In addition to the 48 contiguous states, Interstate Highways are found in Hawaii, Alaska, and Puerto Rico. The Federal Highway Administration funds four routes in Alaska and three routes in Puerto Rico under the same program as the rest of the Interstate Highway System. However, these routes are not required to meet the same standards as the mainland routes:
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Highways on the Interstate System in Alaska and Puerto Rico shall be designed in accordance with such geometric and construction standards as are adequate for current and probable future traffic demands and the needs of the locality of the highway.[1]
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Hawaii
The Interstate Highways on the island of Oʻahu, Hawaii are signed with the standard Interstate Highway shield, with the letter "H-" prefixed before the number. They are fully controlled-access routes built to the same standards as the mainland Interstate Highways.
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Alaska
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Puerto Rico
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Puerto Rico signs its Interstate Highways as territorial routes, as the numbers do not match their official Interstate Highway designations. Many of the territory's routes are freeway-standard toll roads.[3] Template:Routelist top Template:Routelist row Template:Routelist row Template:Routelist row Template:Routelist bottom
See also
References
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External links
- Template:Osmrelation
- Alaska Roads - Interstate ends photos
- Puerto Rico road photos
- The Dwight D. Eisenhower National System of Interstate and Defense Highways Route Log and Finder List
- 3-digit Interstate Highways
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