Last official estimated population of Washington County was 14,699 (year 2014)[1]. This was 0.005% of total US population and 0.1% of total Illinois state population. Area of Washington County is 563.9 mi² (=1460.5 km²), in this year population density was 26.07 p/mi². If population growth rate would be same as in period 2010-2014 (-0.03%/yr), Washington County population in 2024 would be 14,657 [0].
Historical population of Washington County for period 1820-2014 [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
[1820-1830] +1 %/yr
[1830-1840] +11.13 %/yr
[1840-1850] +3.75 %/yr
[1850-1860] +7.04 %/yr
[1860-1870] +2.51 %/yr
[1870-1880] +1.84 %/yr
[1880-1890] -0.91 %/yr
[1890-1900] +0.14 %/yr
[1900-1910] -0.4 %/yr
[1910-1920] -0.39 %/yr
[1920-1930] -1.01 %/yr
[1930-1940] -0.3 %/yr
[1940-1950] -0.88 %/yr
[1950-1960] -0.63 %/yr
[1960-1970] +0.15 %/yr
[1970-1980] +1.16 %/yr
[1980-1990] -0.33 %/yr
[1990-2000] +0.12 %/yr
[2000-2005] -0.27 %/yr
[2005-2010] -0.32 %/yr
[2010-2014] -0.03 %/yr
Looking for settlements in Washington County? Visit this page: Settlements in Washington County, IL
Population of Washington County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 306 | 336 | 642 |
| 5 to 9 | 436 | 455 | 891 |
| 10 to 14 | 466 | 444 | 910 |
| 15 to 19 | 437 | 399 | 836 |
| 20 to 24 | 399 | 401 | 800 |
| 25 to 29 | 443 | 381 | 824 |
| 30 to 34 | 459 | 398 | 857 |
| 35 to 39 | 430 | 430 | 860 |
| 40 to 44 | 434 | 419 | 853 |
| 45 to 49 | 455 | 451 | 906 |
| 50 to 54 | 595 | 600 | 1,195 |
| 55 to 59 | 604 | 556 | 1,160 |
| 60 to 64 | 533 | 439 | 972 |
| 65 to 69 | 385 | 370 | 755 |
| 70 to 74 | 264 | 341 | 605 |
| 75 to 79 | 217 | 259 | 476 |
| 80 to 84 | 152 | 196 | 348 |
| 85+ | 162 | 285 | 447 |
Washington 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 |
| WAC | 7053 | 7070 | 14,123 |
| NH | 7061 | 7050 | 14,111 |
| WA | 6988 | 7015 | 14,003 |
| NHWAC | 6944 | 6971 | 13,915 |
| NHWA | 6879 | 6916 | 13,795 |
| H | 116 | 110 | 226 |
| HWA | 109 | 99 | 208 |
| HWAC | 109 | 99 | 208 |
| BAC | 122 | 79 | 201 |
| NHBAC | 118 | 72 | 190 |
| TOM | 73 | 57 | 130 |
| NHTOM | 73 | 57 | 130 |
| BA | 75 | 45 | 120 |
| NHBA | 71 | 38 | 109 |
| AAC | 37 | 39 | 76 |
| NHAAC | 36 | 38 | 74 |
| IAC | 35 | 23 | 58 |
| NHIAC | 33 | 20 | 53 |
| AA | 23 | 29 | 52 |
| NHAA | 22 | 28 | 50 |
| IA | 13 | 8 | 21 |
| NHIA | 11 | 5 | 16 |
| NAC | 5 | 8 | 13 |
| NHNAC | 5 | 8 | 13 |
| NA | 5 | 6 | 11 |
| NHNA | 5 | 6 | 11 |
| HBAC | 4 | 7 | 11 |
| HBA | 4 | 7 | 11 |
| HIAC | 2 | 3 | 5 |
| HIA | 2 | 3 | 5 |
| HAAC | 1 | 1 | 2 |
| HAA | 1 | 1 | 2 |
| HNAC | 0 | 0 | 0 |
| HTOM | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• St. Clair County population
28.8 mi, 
286°
• Jackson County
39.2 mi, 
177°
• Franklin County
36.5 mi, 
133°
• Marion County
33.7 mi, 
52°
• Jefferson County
27 mi, 
97°
• Clinton County
17.5 mi, 
358°
• Randolph County
30 mi, 
226°
• Monroe County
41.6 mi, 
262°
• Perry County
18.8 mi, 
171°
• Bond County
36.8 mi, 358°
[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
*Randolph, St. Clair Illinois Notes
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