El Paso County is the westernmost county in the U.S. state of Texas. As of the 2020 census, the population was 865,657, making it the ninth-most populous county in the state of Texas. Its seat is the city of El Paso, the sixth-most populous city in Texas and the 22nd-most populous city in the United States. The county was created in 1850 and later organized in 1871.