About Texas Interstate Map
Explore the map of
Texas showing interstate highways with international boundary, state boundary, state capital and major cities.
List of Interstate Highways of Texas
Primary Interstate Highways
| highway Number | Formed in | Length in mi | Length in km |
|---|
| I-2 | 2013 | 46.8 | 75.3 |
| I-10 | 1959 | 877.455 | 1,412.13 |
| I-14 | 2017 | 25.9 | 41.68 |
| I-20 | 1959 | 634.723 | 1,021.49 |
| I-27 | 1968 | 124.182 | 199.852 |
| I-30 | 1959 | 223.404 | 359.534 |
| I-35 | 1959 | 407.195 | 655.317 |
| I-35E | 1959 | 96.657 | 155.554 |
| I-35W | 1959 | 85.283 | 137.25 |
| I-37 | 1959 | 142.787 | 229.793 |
| I-40 | 1959 | 177.139 | 285.078 |
| I-44 | 1982 | 15.398 | 24.781 |
| I-45 | 1959 | 284.913 | 458.523 |
| I-49 | proposed | 2 | 3.2 |
| I-69 | 2011 | 74.9 | 120.5 |
| I-69C | 2013 | 18 | 29 |
| I-69E | 2013 | 81 | 130 |
| I-69W | 2014 | 1.4 | 2.3 |
Auxiliary Interstate Highways
| Highway Number | Formed in | Length in mi | Length in km |
|---|
| I-110 | 1967 | 0.89 | 1.43 |
| I-169 | 2015 | 1.50 | 2.40 |
| I-345 | 1964 | 1.40 | 2.25 |
| I-369 | 2013 | 3.50 | 5.60 |
| I-410 | 1959 | 49.49 | 79.64 |
| I-610 | 1959 | 37.97 | 61.11 |
| I-635 | 1959 | 37.00 | 59.54 |
| I-820 | 1959 | 35.17 | 56.61 |
Business Interstate Highways
| Highway Number | Formed | Length in mi | Length in km |
|---|
| I-10 BL | 1990 | 2.75 | 4.42 |
| I-10 BL | 1990 | 2.88 | 4.64 |
| I-10 BL | 1991 | 2.00 | 3.22 |
| I-10 BL | 1991 | 1.40 | 2.25 |
| I-20 BL | 1991 | 14.04 | 22.60 |
| I-20 BL | 1991 | 8.22 | 13.23 |
| I-20 BL | 1991 | 31.76 | 51.11 |
| I-20 BL | 1995 | 4.69 | 7.54 |
| I-20 BL | 1990 | 5.61 | 9.03 |
| I-20 BL | 1990 | 1.07 | 1.72 |
| I-20 BL | 1990 | 5.93 | 9.54 |
| I-20 BL | 1990 | 1.63 | 2.63 |
| I-20 BS | 1990 | 1.64 | 2.65 |
| I-20 BL | 1990 | 6.45 | 10.38 |
| I-20 BL | 1990 | 2.08 | 3.34 |
| I-20 BL | 1990 | 2.79 | 4.48 |
| I-20 BL | 1990 | 1.66 | 2.67 |
| I-20 BL | 1990 | 8.47 | 13.63 |
| I-20 BL | 1990 | 2.83 | 4.55 |
| I-27 BL | 2002 | 1.17 | 1.88 |
| I-27 BL | 1990 | 9.28 | 14.94 |
| I-35 BL | 1991 | 3.40 | 5.47 |
| I-35 BL | 1990 | 1.22 | 1.97 |
| I-35 BL | 1991 | 2.87 | 4.62 |
| I-35 BL | 1991 | 4.15 | 6.67 |
| I-35 BL | 1991 | 5.45 | 8.77 |
| I-35 BL | 1991 | 4.49 | 7.22 |
| I-35 BL | 1990 | 1.46 | 2.35 |
| I-35 BL | 1990 | 2.29 | 3.68 |
| I-35 BL | 1991 | 1.88 | 3.03 |
| I-40 BL | 1990 | 0.78 | 1.25 |
| I-40 BL | 1990 | 2.37 | 3.81 |
| I-40 BL | 1990 | 3.40 | 5.46 |
| I-40 BL | 1990 | 14.13 | 22.73 |
| I-40 BL | 1990 | 3.53 | 5.69 |
| I-40 BL | 1990 | 3.80 | 6.11 |
| I-40 BL | 1993 | 2.77 | 4.46 |
| I-45 BL | 1990 | 6.37 | 10.25 |
| I-45 BL | 1990 | 4.51 | 7.26 |
| I-45 BL | 1990 | 2.33 | 3.75 |
| I-45 BL | 1990 | 3.37 | 5.42 |
Interstate Highways of Texas
Right now, across the country, none have as much interstate road as Texas does. About 3,240 miles of interstates run through the state, linking big urban areas like Houston and Dallas. Ports along the Gulf Coast link up with inland hubs using these routes. Energy sites deep in the state connect to markets far beyond. Farm country gets linked to manufacturing zones without hassle. Borders with Mexico and Mexico's neighbors also tie into the network. All of this links places, products, and populations over a huge area - more than 268,000 square miles. Seventeen main Interstate routes form the core of the system, along with supporting loops, spurs, and business paths. This setup gives Texas a large and busy Interstate network across the country.
The Major Interstate Corridors
What stands out first are roads like I-10, then I-35, followed by I-45 - each playing a key role. Moving through the state, I-20 shows up too, linking zones far apart; I-27 fills gaps where others stretch thin. Running straight across Texas from Louisiana near Orange, I-10 measures close to 880 miles before entering New Mexico at El Paso. Its path cuts through cities such as Houston, San Antonio, yet also slides silently across endless desert sand. North to south, Interstate 35 runs 407 miles - from Laredo at the Mexican line - passing through San Antonio, Austin, then on to Dallas–Fort Worth before hitting Oklahoma. Heavy traffic moves constantly along this route, which stands among the most traveled shipping routes in North America. Trucks share lanes with drivers every single day. Farther east, I-45 links Galveston with Houston; it stretches 285 miles toward Dallas, shaping a key shipping path between the two cities. From Louisiana's edge, I-20 stretches 636 miles southward into North Texas on its way toward New Mexico. Passing through Longview, then Tyler, the highway reaches the Dallas–Fort Worth area before continuing west toward Abilene. Farther west, Midland–Odessa comes into view along its extended path across the region. Meanwhile, up near the northern edge, I-27 measures just 124 miles long but still plays an essential role - linking Lubbock downward all the way to Amarillo along a vertical axis across the Texas Panhandle.
Economic Importance and Daily Use
Throughout Texas, interstate highways handle massive amounts of cargo and people. By 2025, freight moved along interstate routes for over 250 billion ton-miles each year, fueling fields like oil production, farming, factories, and global commerce. Running straight through the middle of the country, I-35 forms a key pathway - linking Mexico, Canada, and central North America with heavy traffic flowing constantly. Every day, many people in Texas use these roads to get to work, visit relatives, or reach cities far away. In places like Houston, Austin, San Antonio, and the Dallas–Fort Worth region, interstate routes handle huge volumes of traffic each morning.
Current Challenges and Ongoing Improvements
Even though they play a key role, Texas Interstates deal with major issues. Heavy traffic plagues major cities like Dallas–Fort Worth, Houston, Austin, and San Antonio, especially along I-35, I-10, and I-45 where constant delays happen. Much of the infrastructure originally constructed during the 1950s and 1960s now shows signs of aging, meaning full-scale renovation is needed. By 2026, TxDOT is pushing forward with highway expansions along major routes, introducing additional lane management sections, while creating fresh alternate paths. Work continues on upgrading Interstate 35 across Austin and San Antonio. Houston sees I-10 growing broader at the same time. El Paso's Loop 375 also shifts into higher capacity design. East Texas remains active with I-69 improvements still unfolding.
The Future of Texas Interstates
Down in Texas, they’re still pouring money into the interstate network - matching how fast folks and businesses are growing. On the horizon, plans include stretching I-69 further into the Rio Grande Valley, adding more controlled access points along I-35 and I-10, while also bringing in fresh bypass roads around crowded urban zones. Over the next ten years, these upgrades aim to ease traffic flow and lower risks on high-volume routes across a vast stretch of U.S. terrain. Life moves just as fast there, so smooth transportation stays non-negotiable for trade, travel, and everyday living.
