Mission is a city in Hidalgo County, in the US state of Texas, United States. Its population was 85,778 at the 2020 census and an estimated 86,635 in 2022. Mission is part of the McAllen–Edinburg–Mission and Reynosa–McAllen metropolitan areas.

Mission is in southern Hidalgo County. It is bordered to the east by McAllen, the largest city in the county, to the north by Palmhurst, to the west by Palmview, and to the south by the Mexico–United States border along the Rio Grande.

The Interstate 2/U.S. Route 83 freeway passes through Mission, south of the center of town. The highway leads east 5 miles (8 km) to downtown McAllen and 41 miles (66 km) to Harlingen. Interstate 2 ends 7 miles (11 km) west of Mission; US 83 leads west 34 miles (55 km) to Rio Grande City.

According to the United States Census Bureau, Mission has a total area of 34.1 square miles (88.2 km²), of which 0.1 sq mi (0.2 km²), or 0.20%, is covered by water.

As of the 2020 United States census, 85,778 people, 25,172 households, and 20,139 families were residing in the city.

As of the 2010 United States census, 77,058 people, resided in the city.

As of the 2000 United States census, 45,408 people, 13,766 households, and 11,384 families lived in the city. The population density was 1,881.9 inhabitants per square mile (726.6/km²). The 17,723 housing units had an average density of 734.5/sq mi (283.6/km²). The racial makeup of the city was 77.63% White, 0.37% African American, 0.38% Native American, 1.63% Asian, 18.65% from other races, and 2.34% from two or more races. Hispanics or Latinos of any race were 81.03% of the population.

Of the 13,766 households, 43.4% had children under 18 living with them, 64.8% were married couples living together, 14.5% had a female householder with no husband present, and 17.3% were not families; 15.3% of all households were made up of individuals, and 9.1% had someone living alone who was 65 or older. The average household size was 3.29, and the average family size was 3.68.