Nolan Ryan is a retired Major League Baseball pitcher and current president and majority owner of the Texas Rangers.
 Ryan played in a major league record 27 seasons for the New York Mets, California Angels, Houston Astros, and Texas Rangers, from 1966 to 1993.
He was inducted into the Baseball Hall of Fame in 1999.

Sam Bass (1851–1878), outlaw and train robber, was killed in a famous shootout in Round Rock in 1878.
 The shootout is re-enacted once a year as part of the Old Settlers Day celebration in Round Rock.

King Fisher (1854–March 11, 1884) was a Texas rancher and gunfighter who lived in Williamson County during his boyhood.

Dan Moody, a native of Taylor, was the 30th Governor of Texas from 1927 to 1931; he is remembered as a reformer and an opponent of the Ku Klux Klan and as the district attorney for Williamson County.

Paul Womack, judge of the Texas Court of Criminal Appeals, 1997–2015, was as assistant district attorney in Williamson County, 1987–1997, and resident of Georgetown.
Nolan Ryan is a retired Major League Baseball pitcher and current president and majority owner of the Texas Rangers.  Ryan played in a major league record 27 seasons for the New York Mets, California Angels, Houston Astros, and Texas Rangers, from 1966 to 1993. He was inducted into the Baseball Hall of Fame in 1999.
Sam Bass (1851–1878), outlaw and train robber, was killed in a famous shootout in Round Rock in 1878.  The shootout is re-enacted once a year as part of the Old Settlers Day celebration in Round Rock.
King Fisher (1854–March 11, 1884) was a Texas rancher and gunfighter who lived in Williamson County during his boyhood.
Dan Moody, a native of Taylor, was the 30th Governor of Texas from 1927 to 1931; he is remembered as a reformer and an opponent of the Ku Klux Klan and as the district attorney for Williamson County.
Paul Womack, judge of the Texas Court of Criminal Appeals, 1997–2015, was as assistant district attorney in Williamson County, 1987–1997, and resident of Georgetown.
Williamson County, Texas