List of Interstates

Note that the route number of an Interstate Highway is even for roads which are primarily east-west routes, and odd for roads which are primarily north-south.

List of one- and two-digit interstate highways in the United States:

Interstate 4	Florida
Interstate 5	Washington, Oregon, California
Interstate 8	Arizona, California
Interstate 10	Florida, Alabama, Mississippi, Louisiana, Texas, New Mexico, Arizona, California
Interstate 12	Louisiana
Interstate 15	Montana, Idaho, Utah, Arizona, Nevada, California
Interstate 16	Georgia
Interstate 17	Arizona
Interstate 19	Arizona
Interstate 20	South Carolina, Georgia, Alabama, Mississippi, Louisiana, Texas
Interstate 24	Tennessee, Georgia, Tennessee (again), Kentucky, Illinois
Interstate 25	Wyoming, Colorado, New Mexico
Interstate 26	South Carolina, North Carolina, Tennessee
Interstate 27	Texas
Interstate 29	North Dakota, South Dakota, Iowa, Missouri
Interstate 30	Arkansas, Texas
Interstate 35	Minnesota, Iowa, Missouri, Kansas, Oklahoma, Texas
Interstate 37	Texas
Interstate 39	Wisconsin, Illinois
Interstate 40	North Carolina, Tennessee, Arkansas, Oklahoma, Texas, New Mexico, Arizona, California
Interstate 43	Wisconsin
Interstate 44	Missouri, Oklahoma, Texas
Interstate 45	Texas
Interstate 49	Louisiana
Interstate 55	Illinois, Missouri, Arkansas, Tennessee, Mississippi, Louisiana
Interstate 57	Illinois, Missouri
Interstate 59	Georgia, Alabama, Mississippi, Louisiana
Interstate 64	Virginia, West Virginia, Kentucky, Indiana, Illinois, Missouri
Interstate 65	Indiana, Kentucky, Tennessee, Alabama
Interstate 66	District of Columbia, Virginia
Interstate 68	Maryland, West Virginia
Interstate 69	Michigan, Indiana
Interstate 70	Maryland, Pennsylvania, West Virginia, Ohio, Indiana, Illinois, Missouri, Kansas, Colorado, Utah
Interstate 71	Ohio, Kentucky
Interstate 72	Illinois, Missouri
Interstate 73	North Carolina
Interstate 74	Ohio, Indiana, Illinois, Iowa
Interstate 75	Michigan, Ohio, Kentucky, Tennessee, Georgia, Florida (See Also: Alligator Alley)
Interstate 76	Eastern: New Jersey, Pennsylvania, Ohio; Western: Nebraska, Colorado
Interstate 77	Ohio, West Virginia, Virginia, North Carolina, South Carolina
Interstate 78	New York, New Jersey, Pennsylvania
Interstate 79	Pennsylvania, West Virginia
Interstate 80	New Jersey, Pennsylvania, Ohio, Indiana, Illinois, Iowa, Nebraska, Wyoming, Utah, Nevada, California
Interstate 81	New York, Pennsylvania, Maryland, West Virginia, Virginia, Tennessee
Interstate 82	Oregon, Washington
Interstate 83	Pennsylvania, Maryland
Interstate 84	Eastern: Massachusetts, Connecticut, New York, Pennsylvania; Western: Utah, Idaho, Oregon
Interstate 85	Virginia, North Carolina, South Carolina, Georgia, Alabama
Interstate 86	Eastern: New York, Pennsylvania; Western: Idaho
Interstate 87	New York
Interstate 88	Eastern: New York; Western: Illinois
Interstate 89	Vermont, New Hampshire
Interstate 90	Massachusetts, New York, Pennsylvania, Ohio, Indiana, Illinois, Wisconsin, Minnesota, South Dakota, Wyoming, Montana, Idaho, Washington
Interstate 91	Vermont, Connecticut, Massachusetts
Interstate 93	Vermont, New Hampshire, Massachusetts
Interstate 94	Michigan, Indiana, Illinois, Wisconsin, Minnesota, North Dakota, Montana
Interstate 95	Maine, New Hampshire, Massachusetts, Rhode Island, Connecticut, New York, New Jersey, Pennsylvania, Delaware, Maryland, Virginia, North Carolina, South Carolina, Georgia, Florida
Interstate 96	Michigan
Interstate 97	Maryland
Interstate 99	Pennsylvania
Interstate 238	California (an unusual exception to the rules)

Hawaii interstates include:

• Interstate H-1
• Interstate H-2
• Interstate H-3

Note: Three-digit interstates (with the exception of I-238) are to be discussed in the same article as the one- or two-digit interstate that the three-digit interstate is a spur or loop of, even if plans to build the connection between the "spur" and the main highway never materialized. For example, I-170 is discussed in the I-70 article, and I-278 in New York and New Jersey is discussed in the I-78 article, even though no connection exists between I-78 and any of its spurs or loops. I-238 is an exception because it is not a loop or spur of any one- or two-digit interstate (no I-38 exists anywhere near I-238).