Spring is a census-designated place (CDP) in Harris County, Texas, United States. It lies within the extraterritorial jurisdiction of Houston and is part of the Greater Houston metropolitan area. The population was 62,559 at the 2020 census. While the name "Spring" is popularly applied to a large area of northern Harris County and a smaller area of southern Montgomery County, the original town of Spring, now known as Old Town Spring, is at the intersection of Spring-Cypress and Hardy roads and encompasses perhaps 1 square kilometer (0.39 sq mi).