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is a city in Hidalgo County, Texas, United States. The population was 26,935 at the 2000 census. Weslaco derives its name from the W.E. Stewart Land Company. It was the hometown of Harlon Block, one of the Marines photographed raising the flag at Iwo Jima.
According to the United States Census Bureau, the city has a total area of 12.8 square miles (33.0 km²), of which, 12.7 square miles (32.9 km²) of it is land and 0.1 square miles (0.2 km²) of it (0.55%) is water.