Williamson County Population 2018

Williamson County's estimated population is 67,328 with a growth rate of -0.46% in the past year according to the most recent United States census data. Williamson County is the 22nd largest county in Illinois.

Year Population Growth Growth Rate
201767,328-312-0.46%
201667,640330.05%
201567,6072210.33%
201467,386-38-0.06%
201367,4246651.00%
201266,759480.07%
201166,7112820.42%
201066,4298,69615.06%
199057,7331,1952.11%
198056,5387,51715.33%
197049,0212,9046.30%
196046,117-2,504-5.15%
195048,621-2,803-5.45%
194051,424-2,456-4.56%
193053,880-7,212-11.81%
192061,09215,99435.46%
191045,09817,30262.25%
190027,7965,57025.06%
189022,2262,90215.02%
188019,3241,99511.51%
187017,3295,12441.98%
186012,2054,98969.14%
18507,2162,75961.90%
18404,4570.00%

Williamson County Population Growth

Population Data via

Williamson County Race Data

Race Population Percentage
White62,41492.70%
Black or African American3,0604.54%
Two or More Races1,1091.65%
Asian7241.08%
American Indian and Alaska Native2660.40%
Native Hawaiian and Other Pacific Islander160.02%

Williamson County Population Pyramid

0k1k1k2k2k3k Male Population0k1k1k2k2k3k 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