Last official estimated population of Williamson County was 66,433 (year 2014)[1]. This was 0.021% of total US population and 0.5% of total Illinois state population. Area of Williamson County is 444.4 mi² (=1150.9 km²), in this year population density was 149.51 p/mi². If population growth rate would be same as in period 2010-2014 (+0.03%/yr), Williamson County population in 2026 would be 66,662 [0].
Historical population of Williamson County for period 1840-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position
[1840-1850] +4.94 %/yr
[1850-1860] +5.4 %/yr
[1860-1870] +3.57 %/yr
[1870-1880] +1.1 %/yr
[1880-1890] +1.41 %/yr
[1890-1900] +2.26 %/yr
[1900-1910] +4.96 %/yr
[1910-1920] +3.08 %/yr
[1920-1930] -1.25 %/yr
[1930-1940] -0.47 %/yr
[1940-1950] -0.56 %/yr
[1950-1960] -0.53 %/yr
[1960-1970] +0.61 %/yr
[1970-1980] +1.44 %/yr
[1980-1990] +0.21 %/yr
[1990-2000] +0.6 %/yr
[2000-2005] +0.83 %/yr
[2005-2010] +0.77 %/yr
[2010-2014] +0.03 %/yr
Looking for settlements in Williamson County? Visit this page: Settlements in Williamson County, IL
Population of Williamson County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 2039 | 1908 | 3,947 |
| 5 to 9 | 2123 | 1999 | 4,122 |
| 10 to 14 | 2136 | 2043 | 4,179 |
| 15 to 19 | 1886 | 1788 | 3,674 |
| 20 to 24 | 1981 | 1966 | 3,947 |
| 25 to 29 | 2274 | 2139 | 4,413 |
| 30 to 34 | 2267 | 2203 | 4,470 |
| 35 to 39 | 2246 | 1990 | 4,236 |
| 40 to 44 | 2225 | 2147 | 4,372 |
| 45 to 49 | 2154 | 2020 | 4,174 |
| 50 to 54 | 2395 | 2446 | 4,841 |
| 55 to 59 | 2317 | 2363 | 4,680 |
| 60 to 64 | 2023 | 2121 | 4,144 |
| 65 to 69 | 1809 | 2018 | 3,827 |
| 70 to 74 | 1367 | 1617 | 2,984 |
| 75 to 79 | 965 | 1212 | 2,177 |
| 80 to 84 | 602 | 834 | 1,436 |
| 85+ | 461 | 924 | 1,385 |
Williamson County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| NH | 32388 | 33018 | 65,406 |
| WAC | 31070 | 32063 | 63,133 |
| WA | 30573 | 31573 | 62,146 |
| NHWAC | 30285 | 31417 | 61,702 |
| NHWA | 29811 | 30952 | 60,763 |
| BAC | 2016 | 1469 | 3,485 |
| NHBAC | 1956 | 1417 | 3,373 |
| BA | 1715 | 1173 | 2,888 |
| NHBA | 1666 | 1135 | 2,801 |
| H | 882 | 720 | 1,602 |
| HWAC | 785 | 646 | 1,431 |
| HWA | 762 | 621 | 1,383 |
| TOM | 522 | 521 | 1,043 |
| NHTOM | 497 | 496 | 993 |
| AAC | 391 | 451 | 842 |
| NHAAC | 379 | 449 | 828 |
| AA | 285 | 353 | 638 |
| NHAA | 280 | 351 | 631 |
| IAC | 296 | 265 | 561 |
| NHIAC | 248 | 222 | 470 |
| IA | 164 | 109 | 273 |
| NHIA | 126 | 78 | 204 |
| HBAC | 60 | 52 | 112 |
| HIAC | 48 | 43 | 91 |
| HBA | 49 | 38 | 87 |
| HIA | 38 | 31 | 69 |
| NAC | 30 | 26 | 56 |
| NHNAC | 27 | 23 | 50 |
| HTOM | 25 | 25 | 50 |
| NA | 11 | 9 | 20 |
| HAAC | 12 | 2 | 14 |
| NHNA | 8 | 6 | 14 |
| HAA | 5 | 2 | 7 |
| HNAC | 3 | 3 | 6 |
| HNA | 3 | 3 | 6 |
• Jackson County population
24.9 mi, 
278°
• Franklin County
18.1 mi, 
0°
• Saline County
21.1 mi, 
85°
• Perry County
34.2 mi, 
315°
• Union County
24.1 mi, 
225°
• Massac County
37.6 mi, 
160°
• Johnson County
18.8 mi, 
171°
• Hamilton County
32.5 mi, 
41°
• Pulaski County
37.2 mi, 
196°
• Pope County
30.3 mi, 
135°
[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
*Franklin Illinois Notes
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