Mason County, Illinois
Mason County: county in Illinois, United States
About
Mason County is a county located in the U.S. state of Illinois. As of the 2010 census, the population was 14,666 and a population density of 10 people per km². After 10 years in 2020 county had an estimated population of 13,173 inhabitants. Its county seat is Havana. The county was created 185 years ago in 1840.
County Snapshot
Mason County at a glance
Mason County currently has 11 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.
Mapped populated places
11
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
HavanaPopulation 2,945
Top linked places
Quick Facts about Mason County
| Population | 13,173 (2020) |
| Country | United States of America |
| State | Illinois (United States) |
| Different from | Mason County, Mason County, Mason County, Mason County, Mason County |
| Area | 1459 km2 |
| Water as percent of area | 4.3% |
| Land as percent of area | 95.7% |
| Latitude & Longitude | 40.2397,-89.9168 |
| Named for | George Mason |
| Capital | Havana |
| Establishment | January 01, 1841 |
| Time Zone | America/Chicago |
| Local time | 19:23:17 (18th April 2026) |
| Density | 9 Pop. per km² as of 2020 |
| Population growth | -11.33% (2010-2020) |
| Weather | 55℉ Rain Showers 7-days weather |
Geography
Mason County is located at 40°14'23"N 89°55'0"W (40.2396500, -89.9167800). It has 4 neighbors: Cass County, Fulton County, Logan County and Schuyler County.
Mason County map
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The largest city of Mason County is Havana with a population of 2,945. Other cities include, Manito population 1,467, San Jose population 587, Bath population 306 and Easton population 283. See all Mason County cities & populated places.
Mason County Populated Places
Cities, towns, neighborhoods & other populated places in Mason County.
| City Name | Population | Title |
|---|---|---|
| Havana | 2,945 | City in Mason County, Illinois, United States |
| Mason City | 2,088 | Township in Mason County, Illinois |
| Manito | 1,467 | Human settlement in Illinois, United States of America |
| San Jose | 587 | Village in Logan and Mason counties, Illinois, United States |
| Allen | 536 | Township in LaSalle County, Illinois |
| Bath | 306 | Human settlement in United States of America |
| Easton | 283 | Human settlement in Illinois, United States of America |
| Kilbourne | 271 | Township in Mason County, Illinois |
| Forest City | 249 | Township in Mason County, Illinois |
| Bishop | 121 | Unincorporated community in Illinois |
| Topeka | 69 | Town in Mason County, Illinois, United States |
Weather
Rain showers before 1pm. Mostly sunny, with a high near 55. Northwest wind around 15 mph, with gusts as high as 26 mph. Chance of precipitation is 80%...
7-Day ForecastOfficial website of Mason County
Official WebsiteDemographics
According to census records, the population of Mason County decreased by 11.33% in 10 years.
| Year | Population | % Change | Method |
|---|---|---|---|
| 2010 | 14,666 | - | census |
| 2011 | 14,471 | -1.35% | estimation process |
| 2012 | 14,322 | -1.04% | estimation process |
| 2013 | 14,144 | -1.26% | estimation process |
| 2014 | 14,103 | -0.29% | estimation process |
| 2015 | 13,863 | -1.73% | estimation process |
| 2016 | 13,675 | -1.37% | estimation process |
| 2017 | 13,677 | 0.01% | estimation process |
| 2018 | 13,533 | -1.06% | estimation process |
| 2019 | 13,359 | -1.3% | estimation process |
| 2020 | 13,173 | -1.41% | estimation process |
People born in Mason County (1)
American educator, editor, temperance advocate Margaret Ashmore Sudduth was born in Mason County
Other places with the same name (5)
- Mason County, Washington county in the state of Washington, United States with a population of 68,224 people.
- Mason County, Michigan county in Michigan, United States with a population of 29,164 people.
- Mason County, West Virginia county in West Virginia, United States with a population of 26,335 people.
- Mason County, Kentucky county in Kentucky, United States with a population of 17,035 people.
- Mason County, Texas county in Texas, United States with a population of 4,344 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. |