Hancock County, Illinois
Hancock County: county in Illinois, United States
About
Hancock County is a county located in the U.S. state of Illinois. As of the 2010 census, the population was 19,104 and a population density of 9 people per km². After 10 years in 2020 county had an estimated population of 17,422 inhabitants. Its county seat is Carthage. The county was created 201 years ago in 1824.
County Snapshot
Hancock County at a glance
Hancock County currently has 19 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.
Mapped populated places
19
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
CarthagePopulation 2,419
Top linked places
Quick Facts about Hancock County
| Population | 17,422 (2020) |
| Country | United States of America |
| State | Illinois (United States) |
| Different from | Hancock County, Hancock County, Hancock County, Hancock County, Hancock County, Hancock County, Hancock County, Hancock County, Hancock County |
| Area | 2110 km2 |
| Water as percent of area | 2.5% |
| Land as percent of area | 97.5% |
| Latitude & Longitude | 40.4038,-91.1647 |
| Named for | John Hancock |
| Capital | Carthage |
| Establishment | January 01, 1825 |
| Time Zone | America/Chicago |
| Local time | 23:21:22 (17th April 2026) |
| Density | 8 Pop. per km² as of 2020 |
| Population growth | -9.65% (2010-2020) |
| Weather | 58℉ Mostly Clear 7-days weather |
Geography
Hancock County is located at 40°24'14"N 91°9'53"W (40.4037800, -91.1647000). It has 7 neighbors: Adams County, Lee County, Henderson County, McDonough County, Schuyler County, Clark County and Lewis County.
Hancock County map
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The largest city of Hancock County is Carthage with a population of 2,419. Other cities include, Warsaw population 1,456, La Harpe population 1,123, Nauvoo population 1,044 and Chili population 597. See all Hancock County cities & populated places.
Hancock County Populated Places (more)
Cities, towns, neighborhoods & other populated places in Hancock County.
| City Name | Population | Title |
|---|---|---|
| Carthage | 2,419 | City in and county seat of Hancock County, Illinois, United States |
| Warsaw | 1,456 | City in Illinois, United States |
| La Harpe | 1,123 | City in Hancock County, Illinois, United States |
| Nauvoo | 1,044 | City and historic district in Hancock County, Illinois, United States |
| Dallas City | 859 | Township in Hancock County, Illinois |
| Chili | 597 | Unincorporated community in Illinois |
| Saint Mary | 585 | Township in Hancock County, Illinois |
| Augusta | 534 | Human settlement in Hancock County, Illinois, United States of America |
| Plymouth | 459 | Village in the United States |
| Bowen | 450 | Human settlement in Illinois, United States of America |
| Denver | 390 | Human settlement in Illinois, United States of America |
| Fountain Green | 262 | Township in Hancock County, Illinois |
| Durham | 251 | Unincorporated community in Illinois |
| Hamilton | 189 | City in Hancock County, Illinois, United States |
| Elvaston | 152 | Human settlement in Hancock County, Illinois, United States of America |
| Ferris | 143 | Village in Hancock County, Illinois, United States |
Weather
Mostly clear. Low around 58, with temperatures rising to around 60 overnight. South wind around 10 mph.
7-Day ForecastOfficial website of Hancock County
Official WebsiteDemographics
According to census records, the population of Hancock County decreased by 9.65% in 10 years.
| Year | Population | % Change | Method |
|---|---|---|---|
| 2010 | 19,104 | - | census |
| 2011 | 18,999 | -0.55% | estimation process |
| 2012 | 18,829 | -0.9% | estimation process |
| 2013 | 18,544 | -1.54% | estimation process |
| 2014 | 18,324 | -1.2% | estimation process |
| 2015 | 18,216 | -0.59% | estimation process |
| 2016 | 18,205 | -0.06% | estimation process |
| 2017 | 17,958 | -1.38% | estimation process |
| 2018 | 17,828 | -0.73% | estimation process |
| 2019 | 17,708 | -0.68% | estimation process |
| 2020 | 17,422 | -1.64% | estimation process |
People born in Hancock County (2)
People born in Hancock County, including businessman Walter William Head, Early Oregon settler, longtime chair of the Women's Auxiliary of the Oregon Pioneer Association. Charlotte Terwilliger Moffett Cartwright, .
More notable people
Other places with the same name (9)
- Hancock County, Indiana county in Indiana, United States with a population of 79,553 people.
- Hancock County, Ohio county in Maine, United States with a population of 75,407 people.
- Hancock County, Maine county in Maine, United States with a population of 55,088 people.
- Hancock County, Mississippi county in Mississippi, United States with a population of 48,000 people.
- Hancock County, West Virginia county in West Virginia, United States with a population of 28,571 people.
- Hancock County, Iowa county in Iowa, United States with a population of 10,507 people.
- Hancock County, Kentucky county in Kentucky, United States with a population of 8,742 people.
- Hancock County, Georgia county in Georgia, United States with a population of 8,494 people.
- Hancock County, Tennessee county in Tennessee, United States with a population of 6,493 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. |