List of business routes of the Interstate Highway System

The Interstate Highway System of the United States, in addition to being a network of freeways, also includes a number of Business Routes assigned by the American Association of State Highway and Transportation Officials (AASHTO). These routes connect a central or commercial district of a city or town with an Interstate bypass, and are signed with green shields resembling the Interstate Highway shield. The word BUSINESS is used instead of INTERSTATE, and, above the number, where the state name is sometimes included, the word LOOP or SPUR appears. A business loop has both ends as its "parent", while a business spur has a "dangling end", sometimes running from the end of the Interstate to the downtown area.

As the main purpose of a Business Interstate is to serve a downtown area, it is typically routed on surface roads. Thus Business Interstates do not have to meet Interstate Highway standards and are not considered part of the Interstate Highway System. AASHTO does, however, apply similar standards as to new U.S. Highways, requiring a new Business Interstate to meet certain design standards. Business Interstates are also sometimes routed onto freeways that were once designated as mainline Interstates themselves, such as the now-decommissioned Interstate 40 Business in Winston-Salem, North Carolina, and the existing Interstate 80 Business in Sacramento, California.

Business Interstates are most often posted in the western states, across the Great Plains and in Michigan. Eastern states generally did not designate business routes, as most of the Interstates paralleled the original U.S. Highways instead of directly replacing them. With the exception of mountainous areas, this left most of the U.S. Highways in place, or as co-signed routes with the parent Interstate, while the former routes were redesignated as local or frontage roads. In contrast, construction of the Interstate system in the western states often directly overlaid the old U.S. Highway, leaving the former road impassable or as a disconnected route. Exceptions were at cities and towns, where the freeway would shift onto a bypass around them. This often left extant segments of old U.S. Highways in place, with a business route designation applied to them as a motorist aid to and from a business district of collection of motorists services.

Like auxiliary Interstate Highways, Business Interstates can be repeated from state to state along their route. However, unlike auxiliary Interstate Highways, Business Interstates can ''also'' be repeated in several locations within the same state.

List

Defunct routes are listed in italics.

Interstate 5

*'' I-5 Bus.''—San Ysidro, National City and San Diego, California
*'' I-5 Bus.''—San Diego, California
*'' I-5 Bus.''—Solana Beach, California
*'' I-5 Bus.''—San Clemente, California
* I-5 Bus.—Irvine, California
* I-5 Bus.—Los Angeles, California
*'' I-5 Bus.–Coalinga, California
* I-5 Bus.—Woodland, California
* I-5 Bus.— Arbuckle, California
* I-5 Bus.— Williams and Maxwell, California
* I-5 Bus.— Willows and Orland, California
* I-5 Bus.— Red Bluff, California
*'' I-5 Bus.''— Cottonwood, California
*'' I-5 Bus.''— Anderson and Redding, California
* I-5 Bus.—Dunsmuir, California
* I-5 Bus.— Mount Shasta, California
* I-5 Bus.— Weed, California
* I-5 Bus.—Yreka, California
*'' I-5 Bus.''—Vancouver, Washington
* I-5 Bus.— Castle Rock, Washington
*'' I-5 Bus.''— Chehalis and Centralia, Washington
*'' I-5 Bus.''—Olympia, Washington
*'' I-5 Bus.''— Fife, Washington and Midway (near Des Moines, Washington)
*'' I-5 Bus.''—Seattle, Washington
*'' I-5 Bus.''—Marysville, Washington and Everett, Washington
*'' I-5 Bus.''—Bellingham, Washington

Interstate 205

* I-205 Bus.—Tracy, California

Interstate 8

*'' I-8 Bus.''—San Diego, California
* I-8 Bus.—El Cajon, California
*'' I-8 Bus.''— Alpine, California
* I-8 Bus.— El Centro, California
* State Bus. Route 8 (1)—Winterhaven, California and Yuma, Arizona
* State Bus. Route 8 (3)—Gila Bend, Arizona

Interstate 10

*'' I-10 Bus.''—Ontario, California
*'' I-10 Bus.''—Colton, California
*'' I-10 Bus.''—Indio, California
* I-10 Bus.—Blythe, California
* State Bus. Route 10 (1)—Quartzsite, Arizona
*'' State Bus. Route 10''—Phoenix, Arizona
*'' State Bus. Route 10''—Casa Grande, Arizona
*'' State Bus. Route 10 (2)''—Tucson, Arizona
* State Bus. Route 10 (3)—Benson, Arizona
*'' State Bus. Route 10 Spur''—Benson, Arizona
* State Bus. Route 10 (4)— Willcox, Arizona
* State Bus. Route 10 (5)—Bowie, Arizona
* State Bus. Route 10 (6)—San Simon, Arizona
* BL 21— Lordsburg, New Mexico
* BL 22—Deming, New Mexico
*'' BL''—Las Cruces, New Mexico
* Bus. I-10-C— Sierra Blanca, Texas
* Bus. I-10-D— Van Horn, Texas
* Bus. I-10-F—Balmorhea, Texas
* Bus. I-10-G—Fort Stockton, Texas

Interstate 15

* I-15 Bus.—Escondido, California
* I-15 Bus.—Victorville, California
* I-15 Bus.— Barstow, California
*'' I-15 Bus.''— Mesquite, Nevada
* I-15 Bus.- St. George, Utah
* I-15 Bus.—Cedar City, Utah
* I-15 Bus.— Parowan, Utah
* I-15 Bus.—Beaver, Utah
* I-15 Bus.—Fillmore, Utah
*'' I-15 Bus.''—Holden, Utah
* I-15 Bus.— Nephi, Utah
*'' I-15 Bus.''—Layton, Utah
* I-15 Bus.—Brigham City, Utah
* I-15 Bus.—Tremonton, Utah
* I-15 Bus.—Pocatello, Idaho
* I-15 Bus.—Idaho Falls, Idaho
* I-15 Bus.—Butte, Montana
* I-15 Bus.—Helena, Montana
* I-15 Bus.—Great Falls, Montana
* I-15 Bus.— Conrad, Montana
* I-15 Bus.— Shelby, Montana

Interstate 17

*'' State Bus. Route 17''—Black Canyon City, Arizona

Interstate 19

* State Bus. Route 19 (1)—Nogales, Arizona
*'' State Bus. Route 19 (2)''— Sahuarita, Arizona – Tucson, Arizona (Still shown on all Rand McNally road atlases.)

Interstate 20

* Bus. I-20-B— Pecos, Barstow, Texas
* Bus. I-20-D—Monahans, Texas
* Bus. I-20-E—Odessa, Midland, Texas
* Bus. I-20-F—Stanton, Texas
* Bus. I-20-G—Big Spring, Texas
* Bus. I-20-H— Westbrook, Texas
* Bus. I-20-J— Colorado City, Texas
* Bus. I-20-K—Loraine, Texas
* Bus. I-20-L—Roscoe, Texas
* Bus. I-20-M—Sweetwater, Texas
* Bus. I-20-N—Trent, Texas
* Bus. I-20-P— Merkel, Texas
* Business I-20-Q—Tye, Texas
* Bus. I-20-R—Abilene, Texas
* Bus. I-20-T—Baird, Texas
* I-20 BS—Florence, South Carolina

Interstate 24

* I-24 Bus.—Paducah, Kentucky
*'' Downtown Loop ¹''—Paducah, Kentucky

¹ Downtown Loop I-24 in Paducah, Kentucky was changed to Business Loop I-24 in 2002.

Interstate 25

* BL (11)— Williamsburg, New Mexico – Truth or Consequences, New Mexico
* BL (12)—Socorro, New Mexico
* BL (13)—Belen, New Mexico
*'' BL (14)''—Santa Fe, New Mexico
* BL (15)—Las Vegas, New Mexico
* BL (16)—Springer, New Mexico
* BL (17)— Raton, New Mexico
*'' State Highway 25A''—Trinidad, Colorado
* State Highway 25B Spur—Aguilar, Colorado
* State Highway 25C—Walsenburg, Colorado
*'' State Highway 25 Bus.''—Colorado Springs, Colorado
*'' State Highway 25 Bus.''—Castle Rock, Colorado (Likely unsigned)
* I-25 Bus.—Cheyenne, Wyoming
* I-25 Bus.—Chugwater, Wyoming
* I-25 Bus.— Wheatland, Wyoming
* I-25 Bus.—Douglas, Wyoming
* I-25 Bus.— Glenrock, Wyoming
* I-25 Bus.—Casper, Wyoming
* I-25 Bus.—Buffalo, Wyoming

Interstate 126

*'' I-126 BS''—Columbia, South Carolina

Interstate 526

* I-526 BS— Mount Pleasant, South Carolina

Interstate 27

* Bus. I-27-T—Hale Center, Texas
* Bus. I-27-U—Plainview, Texas

Interstate 29

* I-29 Bus.—Saint Joseph, Missouri
* I-29 Bus.—Elk Point, South Dakota
* I-29 Bus.—Brookings, South Dakota
* I-29 Downtown Spur—Sioux Falls, South Dakota
* I-29P Bus.—North Sioux City, South Dakota (unsigned)

Interstate 229

* I-229 Downtown Loop—Sioux Falls, South Dakota

Interstate 30

*'' I-30 Bus.''—Benton, Arkansas
*'' I-30 Bus.''—Little Rock, Arkansas

Interstate 35

* BS I-35-A—Laredo, Texas
* Bus. I-35-B— Encinal, Texas
* Bus. I-35-C— Cotulla, Texas
* Bus. I-35-D—Dilley, Texas
* Bus. I-35-E—Pearsall, Texas
* Bus. I-35-H—New Braunfels, Texas
* Bus. I-35-J— Kyle, Texas
* Bus. I-35-L—Round Rock, Texas
*'' Bus. I-35-M''—Georgetown, Texas (Cancelled July 2006)
* BS I-35-V— Alvarado, Texas
* Bus. I-35-X—Sanger, Texas
* I-35 BL—Ames, Iowa
* I-35 BL— Clear Lake, Iowa
* I-35 Bus.—Faribault, Minnesota
* I-35 Bus.—Albert Lea, Minnesota
* I-35 Bus.— Pine City, Minnesota

Interstate 40

* I-40 Bus.—Needles, California
*'' State Bus. Route 40 (0)''—Kingman, Arizona
* State Bus. Route 40 (1)— Seligman, Arizona
* State Bus. Route 40 (2)—Ash Fork, Arizona
*'' State Bus. Route 40 (3)''—Williams, Arizona
* State Bus. Route 40 (4)—Flagstaff, Arizona
*'' State Bus. Route 40 (5)''—Flagstaff, Arizona
*'' State Bus. Route 40 (6)''—Winslow, Arizona
* State Route 40 Spur—Winslow, Arizona
* State Bus. Route 40 (7)—Joseph City, Arizona
* State Bus. Route 40 (8)— Holbrook, Arizona
*'' I-40 Bus.''—Gallup, New Mexico
*'' I-40 Bus.''— Grants, New Mexico
*'' I-40 Bus.''—Albuquerque, New Mexico
* Bus. Route 40 (34)— Moriarty, New Mexico
* Bus. Route 40 (35)— Santa Rosa, New Mexico
* Bus. Route 40 (36)—Tucumcari, New Mexico
* Bus. I-40-A†—Glenrio, Texas
* Bus. I-40-B—Adrian, Texas
* Bus. I-40-C—Vega, Texas
* Bus. I-40-D—Amarillo, Texas
* Bus. I-40-F—Groom, Texas
* Bus. I-40-H— McLean, Texas
* Bus. I-40-J—Shamrock, Texas
* I-40 Bus.—Erick, Oklahoma
* I-40 Bus.—Sayre, Oklahoma
* I-40 Bus.—Elk City, Oklahoma
* I-40 Bus.—Clinton, Oklahoma
* I-40 Bus.— Weatherford, Oklahoma
* I-40 Bus.—El Reno, Oklahoma
* I-40 Bus.—Henryetta, Oklahoma
* I-40 Bus.— Sallisaw, Oklahoma
*'' I-40 Bus.''—Winston-Salem and Greensboro, North Carolina (Winston-Salem portion removed in February 2020; Greensboro portion (separated by a six-mile gap) removed September 2008)
*'' I-40 Bus.''—Raleigh, North Carolina (Replaced by Interstate 440)

† Business Loop I-40 for Glenrio, Texas is a spur route (at the New Mexico state line it becomes a country road), but is posted as a business loop.

Interstate 44

* I-44 Bus.—Joplin, Missouri
* I-44 Bus.—Sarcoxie, Missouri
* I-44 Bus.—Mount Vernon, Missouri
* I-44 Bus.—Springfield, Missouri
* I-44 Bus.—Lebanon, Missouri
* I-44 Bus.— Waynesville/ St. Robert, Missouri
* I-44 BS— Ft. Leonard Wood, Missouri
* I-44 Bus.—Rolla, Missouri
* I-44 Bus.—Pacific, Missouri

Interstate 45

* Bus. I-45-F—Corsicana, Texas
* Bus. I-45-G— Ennis, Texas
* Bus. I-45-H—Palmer, Texas
* Bus. I-45-J— Ferris, Texas

Interstate 49

* I-49 Bus.—Neosho, Missouri
* I-49 Bus.—Joplin, Missouri
* I-49 Bus.—Nevada, Missouri
* I-49 Bus.—Butler, Missouri

Interstate 55

* I-55 Bus.— New Madrid, Missouri
* I-55 Bus.— Cape Girardeau-Fruitland, Missouri
* I-55 Bus.—Crystal City, Missouri

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