Richland County, Illinois
Richland County: county in Illinois, United States
About
Richland County is a county located in the U.S. state of Illinois. As of the 2010 census, the population was 16,233 and a population density of 17 people per km². After 10 years in 2020 county had an estimated population of 15,507 inhabitants. Its county seat is Olney. The county was created 185 years ago in 1841.
County Snapshot
Richland County at a glance
Richland County currently has 7 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.
Mapped populated places
7
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
OlneyPopulation 8,667
Top linked places
Quick Facts about Richland County
| Population | 15,507 (2020) |
| Country | United States of America |
| State | Illinois (United States) |
| Different from | Richland County, Richland County, Richland County, Richland County, Richland County, Richland Parish |
| Area | 938 km2 |
| Water as percent of area | 0.5% |
| Land as percent of area | 99.5% |
| Latitude & Longitude | 38.7124,-88.0851 |
| Named for | Richland County |
| Capital | Olney |
| Establishment | February 24, 1841 |
| Time Zone | America/Chicago |
| Local time | 20:51:36 (18th April 2026) |
| Density | 17 Pop. per km² as of 2020 |
| Population growth | -4.68% (2010-2020) |
| Weather | 78℉ Showers And Thunderstorms Likely 7-days weather |
Geography
Richland County is located at 38°42'44"N 88°5'6"W (38.7123600, -88.0851000). It has 6 neighbors: Clay County, Crawford County, Jasper County, Lawrence County, Wabash County and Wayne County.
Richland County map
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The largest city of Richland County is Olney with a population of 8,667. Other cities include, Noble population 719, Parkersburg population 201, Claremont population 168 and Calhoun population 164. See all Richland County cities & populated places.
Richland County Populated Places
Cities, towns, neighborhoods & other populated places in Richland County.
| City Name | Population | Title |
|---|---|---|
| Olney | 8,667 | City in Richland County, Illinois, United States of America |
| Amity | 807 | Township in Livingston County, Illinois |
| Noble | 719 | Village in Illinois |
| Seminary | 483 | Township in Fayette County, Illinois |
| Parkersburg | 201 | Human settlement in Illinois, United States of America |
| Claremont | 168 | Village in Richland County, Illinois, United States |
| Calhoun | 164 | Village in the United States |
Weather
Showers and thunderstorms likely. Partly sunny, with a high near 78.
7-Day ForecastDemographics
According to census records, the population of Richland County decreased by 4.68% in 10 years.
| Year | Population | % Change | Method |
|---|---|---|---|
| 2010 | 16,233 | - | census |
| 2011 | 16,190 | -0.27% | estimation process |
| 2012 | 16,134 | -0.35% | estimation process |
| 2013 | 16,008 | -0.79% | estimation process |
| 2014 | 16,020 | 0.07% | estimation process |
| 2015 | 15,957 | -0.39% | estimation process |
| 2016 | 15,829 | -0.81% | estimation process |
| 2017 | 15,837 | 0.05% | estimation process |
| 2018 | 15,695 | -0.9% | estimation process |
| 2019 | 15,513 | -1.17% | estimation process |
| 2020 | 15,507 | -0.04% | estimation process |
Other places with the same name (5)
- Richland County, South Carolina county in South Carolina, United States with a population of 419,051 people.
- Richland County, Ohio county in Ohio, United States with a population of 120,891 people.
- Richland County, Wisconsin county in Wisconsin, United States with a population of 17,258 people.
- Richland County, North Dakota county in North Dakota, United States with a population of 16,156 people.
- Richland County, Montana county in Montana, United States with a population of 11,043 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. |