The Planning and Development Services Department generates monthly population estimates and future population projections based on recent development activity. The population estimate is updated monthly to reflect completed single-family units, and completed multifamily units are added twice a year in October and April. Projections are adjusted every ten years as decennial Census figures are released. 

• As of October 2020, Round Rock’s estimated population is 119,292 (within the city limits).
• Population projections 2010-2030 (pdf), last updated April 2020 

The City’s Economic Development partnership with the Chamber of Commerce compiles additional demographic information from a variety of sources.