2017 Growth Rate
-0.77%
County Website
State
Founded
1825
County Seat
Monmouth
Lat/Lng
Warren County, Illinois's estimated population is 17,170 with a growth rate of -0.77% in the past year according to the most recent United States census data. Warren County, Illinois is the 62nd largest county in Illinois.
| Year | Population | Growth | Growth Rate |
| 2018 | 17,032 | -138 | -0.80% |
| 2017 | 17,170 | -133 | -0.77% |
| 2016 | 17,303 | -163 | -0.93% |
| 2015 | 17,466 | -253 | -1.43% |
| 2014 | 17,719 | 49 | 0.28% |
| 2013 | 17,670 | -84 | -0.47% |
| 2012 | 17,754 | -85 | -0.48% |
| 2011 | 17,839 | 120 | 0.68% |
| 2010 | 17,719 | -1,462 | -7.62% |
| 1990 | 19,181 | -2,762 | -12.59% |
| 1980 | 21,943 | 348 | 1.61% |
| 1970 | 21,595 | 8 | 0.04% |
| 1960 | 21,587 | -394 | -1.79% |
| 1950 | 21,981 | 695 | 3.27% |
| 1940 | 21,286 | -459 | -2.11% |
| 1930 | 21,745 | 257 | 1.20% |
| 1920 | 21,488 | -1,825 | -7.83% |
| 1910 | 23,313 | 150 | 0.65% |
| 1900 | 23,163 | 1,882 | 8.84% |
| 1890 | 21,281 | -1,652 | -7.20% |
| 1880 | 22,933 | -241 | -1.04% |
| 1870 | 23,174 | 4,838 | 26.39% |
| 1860 | 18,336 | 10,160 | 124.27% |
| 1850 | 8,176 | 1,437 | 21.32% |
| 1840 | 6,739 | 6,431 | 2087.99% |
| 1830 | 308 | 0.00% |
| Race | Population | Percentage |
| White | 15,626 | 89.66% |
| Some Other Race | 571 | 3.28% |
| Black or African American | 485 | 2.78% |
| Asian | 404 | 2.32% |
| Two or More Races | 335 | 1.92% |
| American Indian and Alaska Native | 8 | 0.05% |
39.1
37.5
40.2
There are 13,558 adults, (3,150 of whom are seniors) in Warren County, Illinois.
Female
8,990
51.58%
Male
8,439
48.42%
| Type | Count | Average Size | Owned |
| All | 6,802 | 2.38 | 74.7 |
| Married | 3,494 | 2.97 | 86.9 |
| Non Family | 2,295 | 1.16 | 60.5 |
| Female | 793 | 3.12 | 65.4 |
| Male | 220 | 3.2 | 62.7 |
| Education Attained | Count | Percentage |
| Less Than 9th Grade | 501 | 4.39% |
| 9th to 12th Grade | 882 | 7.73% |
| High School Graduate | 3,831 | 33.59% |
| Some College | 2,358 | 20.68% |
| Associates Degree | 1,057 | 9.27% |
| Bachelors Degree | 1,959 | 17.18% |
| Graduate Degree | 816 | 7.16% |
| Name | Total | High School | Bachelors |
| White | 10,102 | 9,159 | 2,503 |
| Hispanic | 786 | 435 | 140 |
| Other Race | 306 | 118 | 16 |
| Black | 244 | 192 | 22 |
| Asian | 239 | 202 | 103 |
| Multiple Races | 98 | 98 | 47 |
The highest rate of high school graduation is among multiple races people with a rate of 100.00%.
The highest rate of bachelors degrees is among multiple races people with a rate of 47.96%.
$33,597
Average Earnings
$38,327
Average Male
$27,571
Average Female
91.54% of Warren County, Illinois residents speak only English, while 8.46% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 5.84% of the population.
| Name | Total | In Poverty | Poverty Rate |
| White | 13,790 | 1,809 | 13.12% |
| Hispanic | 1,513 | 212 | 14.01% |
| Other | 571 | 134 | 23.47% |
| Asian | 362 | 86 | 23.76% |
| Black | 319 | 86 | 26.96% |
| Multiple | 330 | 45 | 13.64% |
13.81%
Overall Poverty Rate
11.19%
Male Poverty Rate
16.30%
Female Poverty Rate
The race most likely to be in poverty in Warren County, Illinois is Black, with 26.96% below the poverty level.
The race least likely to be in poverty in Warren County, Illinois is White, with 13.12% below the poverty level.
The poverty rate among those that worked full-time for the past 12 months was 3.64%. Among those working part-time, it was 17.92%, and for those that did not work, the poverty rate was 19.60%.
51.2%
Overall Marriage Rate
53.8%
Male Marriage Rate
48.8%
Female Marriage Rate
The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 55-64.
| Name | Veterans | % of Total |
| White | 989 | 7.95% |
| Hispanic | 53 | 5.39% |
| 2 or More | 45 | 39.47% |
| Black | 15 | 3.83% |
3.88%
Veteran Poverty Rate
26.96%
Veteran Disability Rate
62.9%
Labor Force Participation
58.7%
Employment Rate
6.6%
Unemployment Rate
Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.
94.38%
Native Born
5.62%
Foreign Born
4.28%
Non Citizen
94.38% of Warren County, Illinois residents were born in the United States, with 74.72% having been born in Illinois. 4.28% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.
| City | 2010 Census | 2016 Estimated | Growth | Growth Rate |
| Monmouth | 9444 | 9210 | -234 | -2.48% |
| Roseville | 989 | 971 | -18 | -1.82% |
| Alexis | 831 | 799 | -32 | -3.85% |
| Avon | 799 | 751 | -48 | -6.01% |
| Kirkwood | 714 | 696 | -18 | -2.52% |
| Little York | 331 | 328 | -3 | -0.91% |