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