郡道
The state highways in Harris County, Texas consists of approximately 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 of highways to the overall Harris County highway system.