McAllen is a city in Hidalgo County, Texas. It is located at the very southern tip of Texas in an area known as the Rio Grande Valley. As of 2005, the city had a population of 123,055. In 2006 the McAllen-Edinburg-Mission metropolitan area had a population of 670,287. Its southern boundary is located about five miles from the U.S.-Mexico border, the Rio Grande River. McAllen is one of the fastest growing cities in the country. It is also the largest city in Hidalgo County. According to the United States Census Bureau, the city has a total area of 119.8 km² (46.3 mi²). 119.1 km² (46.0 mi²) of it is land and 0.8 km² (0.3 mi²) [of] it (0.63%) is water.

As of 2006, there were 123,055 people, 33,151 households, and 26,089 families residing in the city. The population density was 893.8/km² (2,314.7/mi²). There were 37,922 housing units at an average density of 318.5/km² (824.9/mi²). The racial makeup of the city was 78.46% White, 2.61% African American, 0.40% Native American, 1.93% Asian, 0.04% Pacific Islander, 15.85% from other races, and 2.71% from two or more races. Hispanic or Latino of any race were 80.28% of the population. There were 33,151 households out of which 43.2% had children under the age of 18 living with them, 59.0% were married couples living together, 16.0% had a female householder with no husband present, and 21.3% were non-families. 17.9% of all households were made up of individuals and 6.4% had someone living alone who was 65 years of age or older. The average household size was 3.18 and the average family size was 3.64.