2017 Growth Rate
-0.46%
County Website
State
Founded
January 16, 1836
County Seat
Rockford
Lat/Lng
Winnebago County, Illinois's estimated population is 284,740 with a growth rate of -0.46% in the past year according to the most recent United States census data. Winnebago County, Illinois is the 7th largest county in Illinois.
| Year | Population | Growth | Growth Rate |
| 2018 | 284,081 | -659 | -0.23% |
| 2017 | 284,740 | -1,314 | -0.46% |
| 2016 | 286,054 | -1,168 | -0.41% |
| 2015 | 287,222 | -1,553 | -0.54% |
| 2014 | 288,775 | -2,219 | -0.76% |
| 2013 | 290,994 | -1,118 | -0.38% |
| 2012 | 292,112 | -1,522 | -0.52% |
| 2011 | 293,634 | -1,454 | -0.49% |
| 2010 | 295,088 | 42,175 | 16.68% |
| 1990 | 252,913 | 2,029 | 0.81% |
| 1980 | 250,884 | 4,261 | 1.73% |
| 1970 | 246,623 | 36,858 | 17.57% |
| 1960 | 209,765 | 57,380 | 37.65% |
| 1950 | 152,385 | 31,207 | 25.75% |
| 1940 | 121,178 | 3,805 | 3.24% |
| 1930 | 117,373 | 26,444 | 29.08% |
| 1920 | 90,929 | 27,776 | 43.98% |
| 1910 | 63,153 | 15,308 | 31.99% |
| 1900 | 47,845 | 7,907 | 19.80% |
| 1890 | 39,938 | 9,433 | 30.92% |
| 1880 | 30,505 | 1,204 | 4.11% |
| 1870 | 29,301 | 4,810 | 19.64% |
| 1860 | 24,491 | 12,718 | 108.03% |
| 1850 | 11,773 | 7,164 | 155.44% |
| 1840 | 4,609 | 0.00% |
| Race | Population | Percentage |
| White | 226,817 | 78.89% |
| Black or African American | 36,256 | 12.61% |
| Two or More Races | 8,737 | 3.04% |
| Some Other Race | 7,468 | 2.60% |
| Asian | 7,305 | 2.54% |
| American Indian and Alaska Native | 847 | 0.29% |
| Native Hawaiian and Other Pacific Islander | 82 | 0.03% |
39.6
38.3
40.8
There are 219,221 adults, (46,416 of whom are seniors) in Winnebago County, Illinois.
Female
147,058
51.15%
Male
140,454
48.85%
| Type | Count | Average Size | Owned |
| All | 114,491 | 2.47 | 66.1 |
| Married | 52,402 | 3.11 | 84.5 |
| Non Family | 39,990 | 1.19 | 53.7 |
| Female | 16,023 | 3.29 | 42.5 |
| Male | 6,076 | 3.29 | 51.9 |
| Education Attained | Count | Percentage |
| Less Than 9th Grade | 8,494 | 4.36% |
| 9th to 12th Grade | 16,009 | 8.22% |
| High School Graduate | 62,589 | 32.12% |
| Some College | 46,831 | 24.04% |
| Associates Degree | 17,214 | 8.84% |
| Bachelors Degree | 27,530 | 14.13% |
| Graduate Degree | 16,167 | 8.30% |
| Name | Total | High School | Bachelors |
| White | 149,530 | 136,697 | 37,120 |
| Black | 20,745 | 16,614 | 2,389 |
| Hispanic | 17,189 | 10,927 | 1,650 |
| Asian | 4,825 | 3,871 | 1,984 |
| Other Race | 4,103 | 2,431 | 427 |
| Multiple Races | 2,985 | 2,465 | 553 |
| Native American | 606 | 479 | 80 |
| Islander | 59 | 59 | 5 |
The highest rate of high school graduation is among islander people with a rate of 100.00%.
The highest rate of bachelors degrees is among asian people with a rate of 41.12%.
$35,232
Average Earnings
$42,300
Average Male
$28,231
Average Female
86.12% of Winnebago County, Illinois residents speak only English, while 13.88% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 9.23% of the population.
| Name | Total | In Poverty | Poverty Rate |
| White | 198,786 | 19,313 | 9.72% |
| Black | 35,184 | 13,351 | 37.95% |
| Hispanic | 34,647 | 7,841 | 22.63% |
| Multiple | 8,411 | 2,135 | 25.38% |
| Other | 7,452 | 1,669 | 22.40% |
| Asian | 7,289 | 1,119 | 15.35% |
| Native | 809 | 291 | 35.97% |
| Islander | 81 | 27 | 33.33% |
15.27%
Overall Poverty Rate
13.71%
Male Poverty Rate
16.76%
Female Poverty Rate
The race most likely to be in poverty in Winnebago County, Illinois is Black, with 37.95% below the poverty level.
The race least likely to be in poverty in Winnebago County, Illinois is White, with 9.72% below the poverty level.
The poverty rate among those that worked full-time for the past 12 months was 3.17%. Among those working part-time, it was 17.90%, and for those that did not work, the poverty rate was 20.72%.
48.2%
Overall Marriage Rate
50.5%
Male Marriage Rate
46.1%
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 | 16,412 | 9.15% |
| Black | 1,451 | 5.87% |
| Hispanic | 576 | 2.71% |
| 2 or More | 191 | 4.67% |
| Asian | 159 | 2.94% |
| Other | 94 | 1.98% |
| Indian | 57 | 8.30% |
| Hawaiian | 2 | 2.47% |
7.86%
Veteran Poverty Rate
29.47%
Veteran Disability Rate
64.7%
Labor Force Participation
58.2%
Employment Rate
10%
Unemployment Rate
Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.
91.77%
Native Born
8.23%
Foreign Born
4.25%
Non Citizen
91.77% of Winnebago County, Illinois residents were born in the United States, with 68.15% having been born in Illinois. 4.25% 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 |
| Rockford | 153162 | 147651 | -5511 | -3.60% |
| Loves Park | 23999 | 23413 | -586 | -2.44% |
| Machesney Park | 23495 | 22873 | -622 | -2.65% |
| Roscoe | 10782 | 10521 | -261 | -2.42% |
| South Beloit | 7896 | 7652 | -244 | -3.09% |
| Rockton | 7685 | 7499 | -186 | -2.42% |
| Cherry Valley | 3162 | 3087 | -75 | -2.37% |
| Winnebago | 3101 | 3002 | -99 | -3.19% |
| Pecatonica | 2203 | 2111 | -92 | -4.18% |
| Durand | 1450 | 1404 | -46 | -3.17% |
| New Milford | 697 | 666 | -31 | -4.45% |