High Quality Content by WIKIPEDIA articles! Aldine is a census-designated place (CDP) in unincorporated central Harris County, Texas, United States, located within the extraterritorial jurisdiction of Houston. The population was 13,979 at the 2000 census. In 2007, the population was 16,008, according to City-Data. The community is located on the Hardy Toll Road, Union Pacific Railroad, and Farm to Market Road 525.