Williamson County Population 2018

Williamson County's estimated population is 547,545 with a growth rate of 3.75% in the past year according to the most recent United States census data. Williamson County is the 12th largest county in Texas.

Year Population Growth Growth Rate
2017547,54519,7763.75%
2016527,76920,3494.01%
2015507,42019,0353.90%
2014488,38517,9373.81%
2013470,44814,3783.15%
2012456,07013,8933.14%
2011442,17715,8523.72%
2010426,325286,774205.50%
1990139,55163,03082.37%
198076,52139,216105.12%
197037,3052,2616.45%
196035,044-3,809-9.80%
195038,853-2,845-6.82%
194041,698-2,448-5.55%
193044,1461,2122.82%
192042,9347061.67%
191042,2284,15610.92%
190038,07212,16346.95%
189025,90910,75470.96%
188015,1558,787137.99%
18706,3681,83940.60%
18604,5292,961188.84%
18501,5680.00%

Williamson County Population Growth

Population Data via

Williamson County Race Data

Race Population Percentage
White423,00577.25%
Black or African American34,2966.26%
Asian32,0295.85%
Two or More Races13,5072.47%
American Indian and Alaska Native4,4770.82%
Native Hawaiian and Other Pacific Islander7450.14%

Williamson County Population Pyramid

0k5k10k15k20k Male Population0k5k10k15k20k Female Population8580757065605550454035302520151050
Data Sources
  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990