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 700,634. 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. McAllen apartments for rent comparison page shows most up to date rent information on McAllen apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.