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Population Review

What is the population of Williamson County, TX?

Williamson County in Texas has a population of 643,889, per Census ACS 5-Year estimates. The median household income is $108,309 and the median age is 37.2.

Context

Counties are the primary administrative subdivisions of states and a stable unit for tracking population. Williamson County's population reflects everyone within county lines, including residents of incorporated cities and unincorporated areas.

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Williamson County in Texas has a population of 643,889, per Census ACS 5-Year estimates. The median household income is $108,309 and the median age is 37.2.