Peñitas is a U.S. city in Hidalgo County, Texas. The population was 6,460 at the 2020 census, up from 4,403 at the 2010 census. It is part of th…Peñitas is a U.S. city in Hidalgo County, Texas. The population was 6,460 at the 2020 census, up from 4,403 at the 2010 census. It is part of the McAllen–Edinburg–Mission and Reynosa–McAllen metropolitan areas.