The Planning and Development Services Department generates monthly population estimates and future population projections based on recent development activity. These estimates are adjusted every ten years as decennial Census figures are released.

• As of December 2011, Round Rock's estimated population is 101,169 (within the city limits).
• City Profile of select tables from the 2010 Census 2010 American Community Survey (pdf)
• Population projections 2010-2030 (pdf)