Weslaco is a city in Hidalgo County, Texas, United States. As of the 2020 census the population was 41,103, and in 2020 the estimated popula…Weslaco is a city in Hidalgo County, Texas, United States. As of the 2020 census the population was 41,103, and in 2020 the estimated population was 40,160. It is located at the southern tip of Texas in the Rio Grande Valley near the Mexican border, across the Rio Grande from the city of Nuevo Progreso, Rio Bravo, Tamaulipas.
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