Primary Routes

I-4: Tampa to Daytona Beach, FL

I-5: San Ysidro, CA to Blaine, WA

I-8: San Diego, CA to Casa Grande, AZ

I-10: Santa Monica, CA to Jacksonville, FL

I-12: Baton Rouge to Slidell, LA

I-15: San Diego, CA to Sweetgrass, MT

I-16: Macon to Savannah, GA

I-17: Phoenix to Flagstaff, AZ

I-19: Nogales to Tucson, AZ

I-20: Kent, TX to Florence, SC

I-22: Memphis, TX to Birmingham, AL

I-24: Pulleys Mill, IL to Chattanooga, TN

I-25: Las Cruces, NM to Buffalo, WY

I-26: Kingsport, TN to Charleston, SC

I-27: Lubbock to Amarillo, TX

I-29: Kansas City, MO to Pembina, ND

I-30: Fort Worth, TX to Little Rock, AR

I-35: Laredo, TX to Duluth, MN

I-37: Corpus Christi to San Antonio, TX

I-39: Normal, IL to Wausau, WI

I-70: Cove Fort, UT to Baltimore, MD

I-71: Louisville, KY to Cleveland, OH

I-72: Hannibal, MO to Champaign, IL

I-73: Candor to Greensboro, NC

I-74: Bettendorf, IA to Cincinnati, OH

I-75: Ft. Lauderdale, FL to Sault Ste. Marie, MI

I-76: (WEST) Denver, CO to Big Spring, NE

I-76: (EAST) Westfield Center, OH to Camden, NJ

I-77: Columbia, SC to Cleveland, OH

I-78: Bordnersville, PA to New York, NY

I-79: Charleston, WV to Erie, PA

I-80: San Francisco, CA to Fort Lee, NJ

I-81: Dandridge, TN to Fisher's Landing, NY

I-82: Ellensburg, WA to Hermiston, OR

I-83: Baltimore, MD to Harrisburg, OA

I-84: (WEST) Portland, OR to Echo, UT

I-84: (EAST) Scranton, PA to Sturbridge, MA

I-85: Montgomery, AL to Petersburg, VA

I-86: (WEST) Heyburn to Pocatello, ID

I-86: (EAST) Erie, PA to Elmira, NY

I-87: New York to Champlain, NY

I-88: (WEST) Moline to Chicago, IL

I-88: (EAST) Binghamton to Schenectady, NY

I-89: Concord, NH to Highgate Springs, VT

I-90: Seattle, WA to Boston, MA

I-91: New Haven, CT to Derby Line, VT

I-93: Canton, MA to St. Johnsbury, VT

I-94: Billings, MT to Port Huron, MI

I-95: Miami, FL to Houlton, ME

I-96: Muskegon to Detroit, MI

I-97: Annapolis to Baltimore, MD

I-99: Bedford to Bald Eagle, PA

I-238: Hayward to San Lorenzo, CA

I-40: Barstow, CA to Wilmington, NC

I-43: Beloit to Green Bay, WI

I-44: Wichita Falls, TX to St. Louis, MO

I-45: Galveston to Dallas, TX

I-49: Lafayette to Shreveport, LA

I-55: La Place, LA to Chicago, IL

I-57: Sikeston, MO to Chicago, IL

I-59: Slidell, LA to Lookout Mountain, GA

I-64: St. Louis, MO to Chesapeake, VA

I-65: Mobile, AL to Gary, IN

I-66: Middletown, VA to Washington, DC

I-68: Morgantown, WV to Hancock, MD

I-69: Indianapolis, IN to Port Huron, MI

ALASKA: A1, A2, A3, A4

HAWAII: H1, H2, H3

PUERTO RICO: PRI1, PRI2, PRI3

NOTE: Alaskan and Puerto Rican Interstates are not signed, and Alaska's Interstates are not up to standards.