Fun Facts About The Interstate Highway System

      • Total miles: 46,837 (2004)
      • Longest Interstate Routes:
      I-90, Seattle, Wash., to Boston, Mass., 3,020.54 miles
      I-80, San Francisco, Calif., to Teaneck, N.J., 2,899.54 miles
      I-40, Barstow, Calif., to Wilmington, N.C., 2,555.40 miles
      I-10, Los Angeles, Calif., to Jacksonville, Fla., 2,460.34 miles
      • Shortest two-digit interstate routes:
      I-73, Emery to Greensboro, N.C., 12.27 miles
      I-97, Annapolis to Baltimore, Md., 17.62 miles
      I-99, Bedford to Bald Eagle, Pa., 53 miles
      I-19, Nogales to Tucson, Ariz., 63.35 miles
      • Shortest three-digit interstate routes:
      I-878, 0.70 miles, New York
      I-395, 0.72 miles, Maryland
      I-980, 0.80 miles, California
      I-315, 0.82 miles, Montana
      I-110, 0.94 miles, Texas
      • States with most interstate miles:
      Texas, 17 routes, totaling 3,233.45 miles
      California, 25 routes, totaling 2,455.74 miles
      Illinois, 23 routes, totaling 2,169.53 miles
      Pennsylvania, 22 routes, totaling 1,759.34 miles
      Ohio, 21 routes, totaling 1,572.35 miles
      • Interchanges: 14,750 (approximate)
      • Bridges: 55,512 (as of December 2004)
      • Tunnels: 82 (104 bores)

Source: Federal Highway Administration