Last official estimated population of Warren County was 17,716 (year 2014)[1]. This was 0.006% of total US population and 0.1% of total Illinois state population. Area of Warren County is 543.1 mi² (=1406.5 km²), in this year population density was 32.62 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Warren County population in 2024 would be 17,739 [0].
Historical population of Warren County for period 1830-2014 [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
[1830-1840] +36.15 %/yr
[1840-1850] +1.95 %/yr
[1850-1860] +8.41 %/yr
[1860-1870] +2.37 %/yr
[1870-1880] -0.1 %/yr
[1880-1890] -0.74 %/yr
[1890-1900] +0.85 %/yr
[1900-1910] +0.06 %/yr
[1910-1920] -0.81 %/yr
[1920-1930] +0.12 %/yr
[1930-1940] -0.21 %/yr
[1940-1950] +0.32 %/yr
[1950-1960] -0.18 %/yr
[1960-1970] +0 %/yr
[1970-1980] +0.16 %/yr
[1980-1990] -1.34 %/yr
[1990-2000] -0.23 %/yr
[2000-2005] -0.94 %/yr
[2005-2010] -0.19 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Warren County? Visit this page: Settlements in Warren County, IL
Population of Warren County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 556 | 521 | 1,077 |
| 5 to 9 | 526 | 552 | 1,078 |
| 10 to 14 | 508 | 542 | 1,050 |
| 15 to 19 | 710 | 738 | 1,448 |
| 20 to 24 | 716 | 724 | 1,440 |
| 25 to 29 | 464 | 435 | 899 |
| 30 to 34 | 499 | 486 | 985 |
| 35 to 39 | 492 | 455 | 947 |
| 40 to 44 | 489 | 512 | 1,001 |
| 45 to 49 | 521 | 479 | 1,000 |
| 50 to 54 | 574 | 608 | 1,182 |
| 55 to 59 | 644 | 639 | 1,283 |
| 60 to 64 | 593 | 603 | 1,196 |
| 65 to 69 | 478 | 513 | 991 |
| 70 to 74 | 363 | 415 | 778 |
| 75 to 79 | 292 | 357 | 649 |
| 80 to 84 | 157 | 259 | 416 |
| 85+ | 138 | 316 | 454 |
Warren 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 | 8229 | 8777 | 17,006 |
| WA | 8103 | 8648 | 16,751 |
| NH | 7840 | 8359 | 16,199 |
| NHWAC | 7413 | 8036 | 15,449 |
| NHWA | 7297 | 7921 | 15,218 |
| H | 880 | 795 | 1,675 |
| HWAC | 816 | 741 | 1,557 |
| HWA | 806 | 727 | 1,533 |
| BAC | 319 | 276 | 595 |
| NHBAC | 288 | 242 | 530 |
| BA | 232 | 194 | 426 |
| NHBA | 208 | 171 | 379 |
| AAC | 203 | 154 | 357 |
| NHAAC | 200 | 153 | 353 |
| AA | 181 | 132 | 313 |
| NHAA | 179 | 132 | 311 |
| TOM | 136 | 135 | 271 |
| NHTOM | 126 | 119 | 245 |
| IAC | 85 | 72 | 157 |
| NHIAC | 53 | 43 | 96 |
| IA | 52 | 36 | 88 |
| HBAC | 31 | 34 | 65 |
| HIAC | 32 | 29 | 61 |
| HIA | 30 | 24 | 54 |
| HBA | 24 | 23 | 47 |
| NHIA | 22 | 12 | 34 |
| NAC | 20 | 14 | 34 |
| HTOM | 10 | 16 | 26 |
| NA | 16 | 9 | 25 |
| NHNAC | 12 | 8 | 20 |
| HNAC | 8 | 6 | 14 |
| HNA | 8 | 5 | 13 |
| NHNA | 8 | 4 | 12 |
| HAAC | 3 | 1 | 4 |
| HAA | 2 | 0 | 2 |
• Rock Island County population
42.8 mi, 
3°
• Knox County
21.9 mi, 
75°
• Henry County
42.9 mi, 
36°
• Des Moines County
29.9 mi, 
278°
• Fulton County
34.5 mi, 
140°
• McDonough County
27.4 mi, 
186°
• Hancock County
42.1 mi, 
223°
• Mercer County
25.3 mi, 
345°
• Louisa County
41.8 mi, 
307°
• Henderson County
17 mi, 
261°
[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
*Madison Illinois Notes
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