List of highways in Harris County, Texas

Harris County's location within the state of Texas
System information
Length:	1,212.797 mi (1,951.808 km)
Highway names
Interstates:	Interstate X (I-X) Interstate Highway X (IH-X)
US Highways:	U.S. Highway X (US X)
State:	State Highway X (SH X)
Loops:	Loop X
Spurs:	Spur X
Other roads:	Park Road X (PR X) Farm-to-Market Road X (FM X) Ranch-to-Market Road X (RM X)
System links
Highways in Texas Interstate US State Toll Loops Spurs FM/RM Park Rec

The state highways in Harris County, Texas consists of approximately 1,213 miles (1,952 km) of routes in the Texas state highway system that are located within Harris County. These highways are maintained by the Texas Department of Transportation (TxDOT). These highways are made up of Interstate Highways, U.S. Highways, State Highways, State Loop and Spur Highways, Farm to Market Roads, Park Highways, and Alternate and Business Routes. In addition to these highways, three independent Toll Roads and a section of Interstate 10 that is toll managed are also located in Harris County. These roads are maintained by the Harris County Toll Road Authority, and add approximately 120 miles (190 km) of highways to the overall Harris County highway system.

There are currently four interstates located within Harris County. They consist of three major interstates (Interstate 10 (I-10), known as the Katy Freeway and the East Freeway, Interstate 45 (I-45), known as the Gulf Freeway and the North Freeway, and Interstate 69 (I-69), known as the Southwest Freeway and the Eastex Freeway) and one Auxiliary Interstate (Interstate 610 (I-610), known as "The Loop"). There are also three U.S. Routes located in Harris County. These highways consist of U.S. Route 59 (US 59, known as the Southwest Freeway and the Eastex Freeway), U.S. Route 90 (US 90, known as the Cosby Freeway), and U.S. Route 290 (US 290, known as the Northwest Freeway). There are nine state highways, eight spur and loop highways, one park highway, four toll roads (three independent), twenty-two farm to market roads, four bannered U.S. routes, two bannered state routes, and one bannered farm to market road.