US Road Map

Explore USA road map, The United States boasts one of the most extensive road networks in the world, encompassing over 4 million miles of public roads. This vast network includes the Interstate Highway System, which spans about 48,000 miles and is crucial for national defense, commerce, and daily commutes. Established by the Federal-Aid Highway Act of 1956, the Interstate System facilitates efficient travel between states and connects major cities. Additionally, the U.S. road network supports economic growth by enabling the swift movement of goods and services, thereby playing a pivotal role in the nation's logistics and distribution sectors.

About US Road Map

This road map of USA is showing US interstate highways, state highways with major cities and U.S. states.

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List of Interstate Highways in U.S.

Number	Formed	Length in mi	Length in km	Northern / Eastern Terminus	Southern / Western Terminus
I-2	2013	46.80	75.32	I-69E/US 77/US 83 in Harlingen, Texas	BL US 83 in Peñitas, Texas
I-4	1959	132.30	212.92	I-95/SR 400 in Daytona Beach, Florida	I-275 in Tampa, Florida
I-5	1956	1,381.29	2,222.97	Hwy 99 at Canadian border in Blaine, Washington	Fed. 1/Fed. 1D at Mexican border in San Ysidro, California
I-8	1964	348.25	560.45	I-10 in Casa Grande, Arizona	Sunset Cliffs Boulevard/Nimitz Boulevard in San Diego, California
I-10	1957	2,460.34	3,959.53	I-95/US 17/SR 15/SR 228 in Jacksonville, Florida	SR 1 in Santa Monica, California
I-11	2017	22.60	36.37	I-215/I-515/US 93/US 95/SR 564 in Henderson, Nevada	US 93 at Arizona state line near Boulder City, Nevada
I-12	1967	85.59	137.74	I-10/I-59 in Slidell, Louisiana	I-10 in Baton Rouge, Louisiana
I-14	2017	25.10	40.39	I-35/US 190 in Belton, Texas	US 190/US 190 Bus in Copperas Cove, Texas
I-15	1957	1,433.52	2,307.03	Highway 4 at Canadian border in Sweetgrass, Montana	I-8/SR 15 in San Diego, California
I-16	1966	166.81	268.45	Montgomery Street in Savannah, Georgia	I-75/SR 540 in Macon, Georgia
I-17	1961	145.76	234.58	I-40/SR 89A in Flagstaff, Arizona	I-10/US 60 in Phoenix, Arizona
I-19	1972	63.35	101.95	I-10 in Tucson, Arizona	I-19 Bus. in Nogales, Arizona
I-20	1957	1,539.38	2,477.39	I-95/I-20 Bus. in Florence, South Carolina	I-10 at Scroggins Draw, Texas
I-22	2012	202.22	325.44	I-65 in Birmingham, Alabama	I-269/US 78/MS 304 near Byhalia, Mississippi
I-24	1962	316.36	509.13	I-75 in Chattanooga, Tennessee	I-57 in Pulley's Mill, Illinois
I-25	1957	1,061.67	1,708.59	I-90/US 87 in Buffalo, Wyoming	I-10/US 85/US 180 in Las Cruces, New Mexico
I-26	1960	304.64	490.27	US 17 in Charleston, South Carolina	US 11W/US 23/SR 137 in Kingsport, Tennessee
I-27	1969	124.13	199.77	I-40/US 87/US 287/US 60 in Amarillo, Texas	US 87/Loop 289 in Lubbock, Texas
I-29	1958	755.51	1,215.88	US 81 and PTH 75 at Canadian border in Pembina, North Dakota	I-35/I-70/US 24/US 40/US 71 in Kansas City, Missouri
I-30	1957	366.76	590.24	I-40/US 65/US 67/US 167 in North Little Rock, Arkansas	I-20 in Fort Worth, Texas
I-31	1957	-	-	US 81 and PTH 75 at Canadian border in Pembina, North Dakota	I-94 in Fargo, North Dakota
I-35	1956	1,568.38	2,524.06	MN 61/LSCT/26th Avenue in Duluth, Minnesota	US 83/Victoria Street in Laredo, Texas
I-37	1959	143.00	230.14	I-35/US 281 in San Antonio, Texas	US 181 in Corpus Christi, Texas
I-39	1984	306.14	492.68	WIS 29/US 51 in Wausau, Wisconsin	I-55 in Normal, Illinois
I-40	1964	2,556.61	4,114.46	US 117/NC 132 in Wilmington, North Carolina	I-15 in Barstow, California
I-41	2015	175.00	281.64	I-43/US 41/US 141 in Howard, Wisconsin	I-94/US 41 in Russell, Illinois
I-42	proposed	142.00	228.53	US 70 in Morehead City, North Carolina	I-40/US 70 in Garner, North Carolina
I-43	1981	191.55	308.27	I-41/US 41/US 141 in Howard, Wisconsin	I-39/I-90 in Beloit, Wisconsin
I-44	1958	636.69	1,024.65	I-70 in St. Louis, Missouri	US 82/US 277/US 281/US 287 in Wichita Falls, Texas
I-45	1971	284.91	458.52	I-30/US 67/US 75 in Dallas, Texas	SH 87 in Galveston, Texas
I-49	1984	528.02	849.77	I-435/I-470/US 50/US 71 in Kansas City, Missouri	I-10/US 167/LA 182 in Lafayette, Louisiana
I-55	1960	964.25	1,551.81	US 41 in Chicago, Illinois	I-10 in LaPlace, Louisiana
I-57	1965	386.12	621.40	I-94 in Chicago, Illinois	I-55 in Miner, Missouri
I-59	1960	445.23	716.53	I-24 in Wildwood, Georgia	I-10/I-12 in Slidell, Louisiana
I-64	1961	963.52	1,550.64	I-264/I-664 in Chesapeake, Virginia	I-70/US 61 in Wentzville, Missouri
I-65	1958	887.30	1,427.97	US 12/US 20 in Gary, Indiana	I-10 in Mobile, Alabama
I-66	1991	-	-	Near Pikeville, Kentucky	Witchita, Kansas
I-66	1961	76.28	122.76	US 29 in Washington, D.C.	I-81 in Front Royal, Virginia
I-68	1991	113.15	182.10	I-70 in Hancock, Maryland	I-79 in Morgantown, West Virginia
I-69	1957	879.82	1,415.93	Hwy 402 at Canadian border in Port Huron, Michigan	US 59 in Rosenberg, Texas
I-70	1956	2,172.16	3,495.75	I-695 in Woodlawn, Maryland	I-15 in Cove Fort, Utah
I-71	1959	345.57	556.14	I-90 in Cleveland, Ohio	I-64 in Louisville, Kentucky
I-72	1970	179.29	288.54	Church Street and University Avenue in Champaign, Illinois	US 61 in Hannibal, Missouri
I-73	1997	99.43	160.02	I‑74 and US 220 in Randleman, North Carolina	US 220 near Stokesdale, North Carolina
I-74	1974	491.74	791.38	US 74/NC 41 near Lumberton, North Carolina	I-80 in Bettendorf, Iowa
I-75	1958	1,786.47	2,875.04	Canadian border at Sault Ste. Marie, Michigan	SR 826/SR 916/SR 924 in Miami Lakes, Florida
I-76	1975	186.48	300.11	I-80 at Big Springs, Nebraska	I-70 at Denver, Colorado
I-76	1964	435.66	701.13	I-295 at Bellmawr, New Jersey	I-71 in Westfield Center, Ohio
I-77	1958	610.10	981.86	I-90 in Cleveland, Ohio	I-26 in Columbia, South Carolina
I-78	1957	146.28	235.41	Canal Street in New York City	I-81 at Jonestown, Pennsylvania
I-79	1967	343.46	552.75	PA 5 in Erie, Pennsylvania	I-77 in Charleston, West Virginia
I-80	1956	2,899.59	4,666.44	I-95 in Teaneck, New Jersey	US 101 in San Francisco, California
I-81	1961	855.02	1,376.02	Hwy 137 at Canadian border on Wellesley Island, New York	I-40 in Dandridge, Tennessee
I-82	1957	143.58	231.07	I-84 in Hermiston, Oregon	I-90 in Ellensburg, Washington
I-82	1957	-	-	I-95 in Teaneck, New Jersey	I-81/I-84/US 6 in Scranton, Pennsylvania
I-82	1956	-	-	Providence, Rhode Island	I-84 in East Hartford, Connecticut
I-83	1959	85.03	136.84	I-81 in Harrisburg, Pennsylvania	President Street and Fayette Street in Baltimore, Maryland
I-84	1980	769.62	1,238.58	I-80 in Echo, Utah	I-5 in Portland, Oregon
I-84	1963	232.71	374.51	I-90 in Sturbridge, Massachusetts	I-81 in Scranton, Pennsylvania
I-85	1958	666.05	1,071.90	I-95 in Petersburg, Virginia	I-65 in Montgomery, Alabama
I-86	1980	62.85	101.15	I-15 in Chubbuck, Idaho	I-84 near Declo, Idaho
I-86	1999	223.39	359.51	NY 17/NY 79 in Windsor, New York	I-90 near North East, Pennsylvania
I-86	1968	38.97	62.72	I-90 in Sturbridge, Massachusetts	I-84 in East Hartford, Connecticut
I-87	2017	12.90	20.76	US 64/US 264 in Wendell, North Carolina	I-440/US 64/US 264 in Raleigh, North Carolina
I-87	1957	333.49	536.70	A-15 at Canadian border in Champlain, New York	I-278 in New York City
I-88	1987	140.60	226.27	I-290/IL 110 in Hillside, Illinois	I-80/IL 92 in East Moline, Illinois
I-88	1968	117.75	189.50	I-90 in Schenectady, New York	I-81 in Binghamton, New York
I-89	1960	191.12	307.58	Route 133/Future A-35 at Canadian border in Highgate, Vermont	I-93/SR 3A in Bow, New Hampshire
I-90	1956	3,020.44	4,860.93	MA 1A in Boston, Massachusetts	SR 519/4th Avenue/Edgar Martinez Drive in Seattle, Washington
I-91	1958	290.37	467.31	A-55 at Canadian border in Derby Line, Vermont	I-95/Route 34 in New Haven, Connecticut
I-93	1957	189.95	305.69	I-91 in St. Johnsbury, Vermont	I-95/US 1 in Canton, Massachusetts
I-94	1956	1,585.20	2,551.13	Highway 402 at Canadian border in Port Huron, Michigan	I-90 in Lockwood, Montana
I-95	1957	1,919.31	3,088.83	NB 95 at Canadian border in Houlton, Maine	US 1 in Miami, Florida
I-96	1959	192.06	309.09	I-75 in Detroit, Michigan	US 31 in Norton Shores, Michigan
I-97	1987	17.62	28.36	I-695/I-895 in Glen Burnie, Maryland	US 50 in Annapolis, Maryland
I-99	1998	98.34	158.26	I-86/NY 17 in Painted Post, New York	I-70/I-76 in Bedford, Pennsylvania

Interstate Hiways in Hawaii

Number	Length (mi)	Length (km)	Formed	Northern or eastern terminus	Southern or western terminus	Removed
H-1	27	44	1960	Route 72 in Honolulu	Route 93 in Kapolei	current
H-2	8	13	1960	Route 99 in Wahiawa	H-1 in Pearl City	current
H-3	15	25	1997	Marine Corps Base Hawaii	H-1/H-201 in Halawa	current

Interstate Hiways in Alaska

Number	Length (mi)	Length (km)	Formed	Northern or eastern terminus	Southern or western terminus	Removed
A-1	408	657	1976	Canadian border in Alcan Border	Anchorage	current
A-2	202	325	1976	Fairbanks	Tok	current
A-3	148	238	1976	Soldotna	Anchorage	current
A-4	324	521	1976	Fairbanks	Gateway, near Palmer	current

Interstate Hiways in Puerto Rico

Number	Length (mi)	Length (km)	Formed	Northern or eastern terminus	Southern or western terminus	Removed
PR-1	71	114.39	1976	PR-2 in San Juan	PR-2 in Ponce	current
PR-2	138	222.3	1976	PR-3 in San Juan	PR-1 in Ponce	current
PR-3	41	65.27	1976	PR-2 in San Juan	PR-3 in Humacao	current

Road Network in the United States

The road network in the United States is an extensive and intricate system that is vital to the nation's infrastructure. The total length of the road network reached approximately 4.18 million miles as of 2020, making it one of the most comprehensive road systems globally. Key components of the U.S. road network include the Interstate Highway System, state highways, and local roadways. The Interstate Highway System, established in 1956 through the Federal Aid Highway Act, comprises about 48,000 miles and serves as the backbone for cross-country travel and commerce.

This network facilitates efficient goods transportation, contributing over $700 billion annually to the U.S. economy. The Interstate System alone carries about 25% of all vehicle miles traveled, despite making up only 1% of the total road mileage. The road network also significantly supports the tourism industry, enabling easy access to national parks, historical sites, and other attractions.

Investment in road maintenance and improvement is critical given the age and frequent use of many roadways. The American Society of Civil Engineers (ASCE) rated the U.S. road infrastructure a D in its 2021 report card, highlighting the need for increased funding and modernization efforts. Issues such as traffic congestion and road safety are also pertinent, with urban areas experiencing about 54 hours of delay per commuter annually and road traffic accidents accounting for over 36,000 fatalities in 2019.

Emerging technologies are poised to revolutionize this network. Autonomous vehicles, smart highways, and advanced traffic management systems promise to enhance safety and efficiency. Public and private sector collaboration is essential for integrating these innovations into the existing infrastructure.

Numbered Highway System in the United States

The United States Numbered Highway System, established in 1926, remains one of the most comprehensive road networks in the world. This system, commonly referred to as U.S. Routes, facilitates efficient transportation across all states, providing vital connections between cities, towns, and regions. As of 2021, there are 199 primary numbered highways, with nearly 50,000 miles of roadways, playing a crucial role in both commerce and daily commuting.

History and Development

The concept of a numbered highway system originated from the necessity to create a standardized, efficient method of navigation across the country. Prior to its inception, roads were designated by inconsistent naming conventions, which often led to confusion. The American Association of State Highway Officials (AASHO), now known as the American Association of State Highway and Transportation Officials (AASHTO), spearheaded the initiative to develop a uniform numbering system for highways. This move was in response to the growing need for improved roads due to increased automobile usage in the early 20th century.

Structure and Organization

The numbering system for U.S. Routes is logically organized to enhance user navigation. Major east-west routes are assigned even numbers, while north-south routes are designated with odd numbers. The numbering convention begins with the lowest numbers in the north and east, increasing as one moves south and west. For instance, U.S. Route 1 runs along the East Coast from Fort Kent, Maine, to Key West, Florida, and U.S. Route 2 spans from the Upper Peninsula of Michigan to Everett, Washington.

Key Highways and Their Importance

Several highways in the United States Numbered Highway System are noteworthy for their length and significance:

U.S. Route 20

Stretching over 3,365 miles, U.S. Route 20 holds the distinction of being the longest road in the system. It begins in Boston, Massachusetts, and extends to Newport, Oregon.

U.S. Route 6

Known as the Grand Army of the Republic Highway, it was once the longest route, from Provincetown, Massachusetts, to Long Beach, California, covering 3,199 miles.

U.S. Route 66

Dubbed the "Main Street of America," U.S. Route 66 is perhaps the most famous, with a rich cultural history. Though it was officially removed from the U.S. Highway System in 1985, it continues to attract tourists and is commemorated through various "Historic Route 66" markers.

Modern Usage and Adaptation

Despite the advent of the Interstate Highway System in the 1950s, the U.S. Route network has not lost its relevance. Many of these highways serve as critical connectors between interstate roads and provide essential links to rural areas. U.S. Routes often retain historical and economic importance, supporting local economies by facilitating tourism and commerce.

The Federal Highway Administration (FHWA) continuously monitors and maintains these routes to ensure safety and efficiency. Innovations such as integrated monitoring systems and strategic planning initiatives aim to uphold the integrity of this historic transportation network.

Facts and Figures

Total Routes

199 primary numbered highways.

Total Mileage

Nearly 50,000 miles.

Longest Route

U.S. Route 20 (3,365 miles).

Notable Route

U.S. Route 66, known for its cultural and historical significance.