Profile: Williamson County

Williamson County is the most populous suburban county in the Austin metropolitan area, with a population of 490,000 people and 145,000 jobs. The county has grown much faster than the metro and U.S.:  the population grew 55% from 2004-2014 and job base grew 69%.

The county’s population growth is primarily due to the migration of people into the county: from 2004 to 2014, 71% of new population was due to domestic migration. Over the 10 year period, 123,000 net new migrants moved to the county.

Williamson County has a diverse age range of population, and is home to a large concentration of families. According to the Census, 23% of Williamson County’s population are children under 15 years of age (versus 19% for the U.S.) and 24% of county residents are between 45 and 64 years old (versus 26% for the U.S.).

As a result, the county has lower concentrations of both young adults and the elderly residents than the nation.  Of the total population, 88% were born in the United States, with 12% born abroad.  Of the foreign-born population, 56% are not naturalized US citizens.

Williamson County’s population is 62% White, 24% Hispanic, 6% Black, and 6% Asian. The three largest ancestral groups are German, English, and Irish.


According to estimates from the Census, Williamson County is well-educated: 93% of residents have at least a high school degree and 40% have a Bachelor’s degree or higher. These educational attainment statistics are significantly higher than both the State of Texas (82% high school, 28% Bachelor’s) and the U.S. average (87% high school, 30% Bachelor’s). (American Community Survey, Williamson County)

Williamson County’s median household income has remained above the national average for many years, and was 136% of U.S. median household income in 2014.



The percent of overall population in poverty in Williamson County has also remained significantly below national trends over the past decade. Between 2009 and 2014 overall population in poverty in Williamson County rose from 5.5% to 7.8%. The percentage of children in poverty grew faster than the county as a whole, going from 8.7% in 2009 to 10.0% in 2014.



The Williamson County unemployment rate has fallen from its recent high of 7.3% in 2009 to 4.3% in 2014. The county rate has been consistently lower than the U.S. rate.


The largest industries in Williamson County are:

• Trade, Transportation, & Utilities – 24% of county employment
• Government – 15%
• Leisure & Hospitality -12%
• Professional & Business Services – 12%
• Health Services – 11%




Employment increased for all Williamson County industries between 2009 and 2014. The average increase was 21%, while the national average employment increase was 6%.

The average salary in Williamson County is 98% of the U.S. average and from 2009-2014 grew 16%, higher than the U.S. growth rate of 13%.

Two industries in the county have average salaries above the U.S. average:  Trade, Transportation, and Utilities and Manufacturing. The county’s fastest growing salaries in are Manufacturing, Natural Resources and Mining, and Professional and Business Services.


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