I-37

About I-37

From Corpus Christi, TX (US 181) to San Antonio, TX (I-35)

Interstate 37 is a short north-south route of about 143 miles entirely within Texas, connecting Corpus Christi on the Gulf coast with San Antonio. Despite its odd number, the route is relatively brief and serves chiefly as a link between a major port city and a large inland metropolis. It crosses the South Texas brush country between the two cities.

From its southern terminus near the port of Corpus Christi, the route runs northwest through small towns and ranchland to reach San Antonio, where it ends at I-35 and I-10. It carries port-related freight, energy-sector traffic from the surrounding oil and gas region, and travel between the coast and central Texas.

State-by-state mileage

State	Miles
Texas	143.0
Total	143

History

I-37 was designated in 1959 and built to connect San Antonio with the deepwater port at Corpus Christi, replacing older US highway routing. It has remained a single-state route serving primarily regional and freight traffic.

Major cities and places

Did you know

• Lies entirely within Texas between Corpus Christi and San Antonio.
• Provides the main freeway link to the Port of Corpus Christi.
• Crosses the South Texas brush country and energy region.
• Ends in San Antonio at I-35 and I-10.