Austin Tx Population 2025. Austin, texas is the 11th largest city in the us. Austin county, texas's estimated 2025 population is 32,284 with a growth rate of 1.92% in the past year according to the most recent united states census data.
With a projected population growth rate of 13.55 percent (the highest out of all metro areas), that means austin’s population in the next five years could balloon to. Other biggest cities in the united states.