Union County, Illinois
Union County: county in Illinois, United States
About
Union County is a county located in the U.S. state of Illinois. As of the 2010 census, the population was 17,808 and a population density of 16 people per km². After 10 years in 2020 county had an estimated population of 16,498 inhabitants. Its county seat is Jonesboro. The county was created 208 years ago in 1818.
County Snapshot
Union County at a glance
Union County currently has 9 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.
Mapped populated places
9
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
Mount PleasantPopulation 4,670
Top linked places
Quick Facts about Union County
| Population | 16,498 (2020) |
| Country | United States of America |
| State | Illinois (United States) |
| Different from | Union County, Union Parish, Union County, Union County, Union County, Union County, Union County, Union County, Union County, Union County, Union County, Union County, Union County, Union County, Union County, Union County, Union County |
| Twitter username | unioncountyil |
| Area | 1093 km2 |
| Water as percent of area | 2.1% |
| Land as percent of area | 97.9% |
| Latitude & Longitude | 37.4712,-89.2551 |
| Named for | United States of America |
| Capital | Jonesboro |
| Establishment | January 02, 1818 |
| Time Zone | America/Chicago |
| Local time | 06:45:03 (16th April 2026) |
| Density | 15 Pop. per km² as of 2020 |
| Population growth | -7.94% (2010-2020) |
| Weather | 63℉ Chance Showers And Thunderstorms 7-days weather |
Geography
Union County is located at 37°28'16"N 89°15'18"W (37.4712300, -89.2550900). It has 7 neighbors: Alexander County, Jackson County, Johnson County, Pulaski County, Williamson County, Cape Girardeau County and Perry County.
Union County map
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The largest city of Union County is Anna with a population of 4,059. Other cities include, Jonesboro population 1,677, Cobden population 1,053, Dongola population 672 and Alto Pass population 360. See all Union County cities & populated places.
Union County Populated Places
Cities, towns, neighborhoods & other populated places in Union County.
| City Name | Population | Title |
|---|---|---|
| Mount Pleasant | 4,670 | Township of Illinois |
| Anna | 4,059 | City in Union County, Illinois, United States |
| Jonesboro | 1,677 | City in Union County, Illinois, United States |
| Cobden | 1,053 | Village in Union County, Illinois, United States |
| Dongola | 672 | Human settlement in Illinois, United States of America |
| Alto Pass | 360 | Human settlement in Illinois, United States of America |
| Mason | 333 | This Union County village is situated at an elevation of 584 feet. |
| Saratoga | 255 | Township in Marshall County, Illinois |
| Mill Creek | 64 | Human settlement in Illinois, United States of America |
Weather
A chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms between 1am and 3am, then showers and thunderstorms. Most...
7-Day Forecast- Jonesboro
Demographics
According to census records, the population of Union County decreased by 7.94% in 10 years.
| Year | Population | % Change | Method |
|---|---|---|---|
| 2010 | 17,808 | - | census |
| 2011 | 17,692 | -0.66% | estimation process |
| 2012 | 17,608 | -0.48% | estimation process |
| 2013 | 17,539 | -0.39% | estimation process |
| 2014 | 17,402 | -0.79% | estimation process |
| 2015 | 17,284 | -0.68% | estimation process |
| 2016 | 17,105 | -1.05% | estimation process |
| 2017 | 16,968 | -0.81% | estimation process |
| 2018 | 16,832 | -0.81% | estimation process |
| 2019 | 16,653 | -1.07% | estimation process |
| 2020 | 16,498 | -0.94% | estimation process |
People born in Union County (1)
American football player Walt Houston was born in Union County
Other places with the same name (16)
- Union County, New Jersey county in Oregon, United States with a population of 555,394 people.
- Union County, North Carolina county in North Carolina, United States with a population of 244,562 people.
- Union County, Ohio county in Ohio, United States with a population of 60,021 people.
- Union County, Pennsylvania county in Pennsylvania, United States with a population of 44,294 people.
- Union County, Arkansas county in Arkansas, United States with a population of 38,219 people.
- Union County, Mississippi county in Mississippi, United States with a population of 28,866 people.
- Union County, South Carolina county in South Carolina, United States with a population of 26,991 people.
- Union County, Oregon county in Oregon, United States with a population of 26,551 people.
- Union County, Georgia county in Georgia, United States with a population of 25,358 people.
- Union County, Tennessee county in Tennessee, United States with a population of 20,187 people.
- Union County, South Dakota county in South Dakota, United States with a population of 16,192 people.
- Union County, Florida county in Florida, United States with a population of 15,182 people.
- Union County, Kentucky county in Kentucky, United States with a population of 14,443 people.
- Union County, Iowa county in Iowa, United States with a population of 12,157 people.
- Union County, Indiana county in Indiana, United States with a population of 7,119 people.
- Union County, New Mexico county in New Mexico, United States with a population of 4,026 people.
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. |