Texas, the second-largest state in the Union, has the most state highway miles in the country.

Photography contributions by Alex Nitzman, Andy Field, Brent Ivy, Jeff Royston, Justin Cozart and Kevin Trinkle. Many thanks to Kevin, who both started Lone Star Roads on AARoads in 2005 and compiled the bulk of the original Texas highway guides found throughout the site.

Toll Roads

Other Roads

Population Statistics

State Population
Top City Populations
Houston 2,303,482 San Antonio 1,492,510 Dallas 1,317,929
Austin 947,890 Fort Worth 854,113 El Paso 683,080
Arlington 392,772 Corpus Christi 325,733 Plano 286,057
Top MSA Populations
Dallas/Ft Worth 7,233,323 Houston/ The Woodlands/ Sugar Land 6,772,470 San Antonio/ New Braunfels 2,429,609
Austin/ Round Rock 2,056,405 McAllen/ Edinburg/ Mission 849,843 El Paso 841,971
Corpus Christi 454,726 Killeen/ Temple 435,857 Brownsville/ Harlingen 422,135
Top County Populations
Harris 4,589,928 Dallas 2,574,984 Tarrant 2,016,872
Bexar 1,928,680 Travis 1,199,323 Collin 939,585
Hidalgo 849,843 El Paso 837,918 Denton 806,180
Source: US Census 2016 Population Estimate

What is a FM Road?

A Farm to Market Road (FM) is a secondary state highway. The system was conceived in the 1930s as part of a "Good roads" project to ensure farms (or ranches) have all-weather access to markets. The system was originally funded by an earmark from the general fund with state funds (no federal funds). Some FM roads are eligible for federal aid, however.

There is no difference between a FM, Ranch to Market (RM) or Urban Road (UR) for state purposes. RM markers are generally found in Western Texas where ranches are dominant, while FM roads are generally found in eastern Texas where farms dominate. There are some exceptions to this general rule though.

Urban Roads were originally FM roads (most notably around Houston and San Antonio) but were reclassified in 1995 to UR status (since they don’t serve farms anymore). All are still signed as FM roads to avoid driver confusion and save costs involved in re-signing the road.

Texas Highway Designations

TxDOT classifies Interstates. U.S. Highways, State Highways and other routes across the state with two letter abbreviations. The full list can be found at the TxDOT web site. A summary of those commonly used on AARoads include:

  • IH – Interstate Highway
  • SH – State Highway – includes the lettered routes for Old San Antonio Road (OSR) and NASA Road 1
  • SL – State Highway Loop
  • SS – State Highway Spur
  • UR – Urban Road – a farm or ranch to market road routed within an urban area.
  • RM – Ranch to Market Road – generally used in rural areas of the state
  • PR – Park Road – a state maintained roadway to a state or national park

Other terms referenced in the TxDOT Designation Files (route log for all state maintained roadways):

  • BI – Business Interstate Highway
  • BU – Business US Highway
  • BS – Business State Highway
  • BF – Business Farm to Market Road
  • RE – Recreational Road
  • UA – U.S. Highway Alternate
  • UP – U.S. Highway Spur

Farm and Ranch to Market Roads may have Spur routes posted as well.

Page updated July 31, 2019.