In Hidalgo County
, Mission is located just west of McAllen
on US 83 on the banks of the Rio Grande River near the United States/Mexico border.
By 1970, growth in tourism and in the numbers of 'winter Texans'-residents of colder climates who winter in Texas-led to the building of 74 trailer or motor home courts, with a total of 10,000 spots; the population of Mission had risen to 22,589 by 1980.
At that time the city had three main areas-south Mission, historically Hispanic; north-central Mission, mainly third-generation settlers and retirees; and Sharyland, the northeastern part of the city (adjacent to McAllen), which served as a bedroom community for employees of nearby industries and large farms.
Mission is part of the McAllen-Edinburg-Mission, Texas metro area.