Weslaco 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. Weslaco is part of the McAllen–Edinburg–Mission Metropolitan Statistical Area.