Jersey County, Illinois
Jersey County: county in Illinois, United States
About
Jersey County is a county located in the U.S. state of Illinois. As of the 2010 census, the population was 22,985 and a population density of 24 people per km². After 10 years in 2020 county had an estimated population of 21,616 inhabitants. Its county seat is Jerseyville. The county was created 187 years ago in 1839.
County Snapshot
Jersey County at a glance
Jersey County currently has 8 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.
Mapped populated places
8
These counts use a stricter populated-place filter so the main lists stay focused on real city and town pages.
Illinois counties
102
Open related pagesLargest city
JerseyvillePopulation 8,111
Top linked places
Quick Facts about Jersey County
| Population | 21,616 (2020) |
| Country | United States of America |
| State | Illinois (United States) |
| Area | 976 km2 |
| Water as percent of area | 2.1% |
| Land as percent of area | 97.9% |
| Latitude & Longitude | 39.0857,-90.3567 |
| Named for | New Jersey |
| Altitude | 584 feet / 178 meters |
| Capital | Jerseyville |
| Establishment | February 28, 1839 |
| Time Zone | America/Chicago |
| Local time | 23:21:03 (15th April 2026) |
| Density | 22 Pop. per km² as of 2020 |
| Population growth | -6.33% (2010-2020) |
| Weather | 79℉ Showers And Thunderstorms Likely 7-days weather |
Geography
Jersey County is located at 39°5'8"N 90°21'24"W (39.0856600, -90.3566800). It has 4 neighbors: Calhoun County, Greene County, Macoupin County and Saint Charles County.
Jersey County map
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The largest city of Jersey County is Jerseyville with a population of 8,111. Other cities include, Grafton population 691, Rosedale population 425, Fieldon population 219 and Otterville population 116. See all Jersey County cities & populated places.
Jersey County Populated Places
Cities, towns, neighborhoods & other populated places in Jersey County.
| City Name | Population | Title |
|---|---|---|
| Jerseyville | 8,111 | City in Jersey County, Illinois, United States |
| Grafton | 691 | Town in Illinois, United States |
| Elsah | 604 | Township in Jersey County, Illinois |
| Rosedale | 425 | Unincorporated community in Illinois, United States |
| Fieldon | 219 | Human settlement in Illinois, United States of America |
| Otterville | 116 | Town of the United States |
| Fidelity | 113 | Human settlement in Illinois, United States of America |
| Camden | 76 | Village in Illinois, United States |
Weather
Showers and thunderstorms likely before 1pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 79. Chance of precipitation i...
7-Day ForecastOfficial website of Jersey County
Official WebsiteDemographics
According to census records, the population of Jersey County decreased by 6.33% in 10 years.
| Year | Population | % Change | Method |
|---|---|---|---|
| 2010 | 22,985 | - | census |
| 2011 | 22,879 | -0.46% | estimation process |
| 2012 | 22,710 | -0.74% | estimation process |
| 2013 | 22,599 | -0.49% | estimation process |
| 2014 | 22,492 | -0.48% | estimation process |
| 2015 | 22,260 | -1.04% | estimation process |
| 2016 | 21,947 | -1.43% | estimation process |
| 2017 | 21,912 | -0.16% | estimation process |
| 2018 | 21,795 | -0.54% | estimation process |
| 2019 | 21,773 | -0.1% | estimation process |
| 2020 | 21,616 | -0.73% | estimation process |
People born in Jersey County (1)
American temperance worker Jennie Florella Holmes was born in Jersey County
Illinois Other Counties (more counties)
| County Name | Population | Title |
|---|---|---|
| Cook County | 5,108,284 | County in Illinois, United States |
| Chicago | 2,677,643 | The third most populous city in the United States and the center of the Chicago metropolitan area. |
| DuPage County | 917,481 | County in Illinois, United States |
| Lake County | 693,593 | County in Oregon, United States |
| Will County | 688,726 | County in Illinois, United States |
| Kane County | 531,010 | County in southern Utah, United States |
| McHenry County | 305,888 | County in Illinois, United States |
| Winnebago County | 281,295 | County in Illinois, United States |
| Madison County | 262,635 | County in Montana, United States |
| Saint Clair County | 258,046 | The County of St. |
| Champaign County | 209,192 | County in Illinois, United States |
| Aurora | 196,383 | The second most populous city in Illinois. |
| Sangamon County | 193,882 | County in Illinois, United States |
| Peoria County | 177,652 | County in Illinois, United States of America |
| McLean County | 171,256 | County in North Dakota, United States |
| Naperville | 147,986 | The second most populous city in Illinois. |