Mercer County, Illinois
Mercer County, Illinois · ZIP 61231, 61260, 61262
- Census data · ACS 2019-2023
- 15,292 (2024 estimate)Population
- 6,413Households
- $71,710Median household income
- $139,300Median home value
- 31Towns with a page
- 14ZIP codes
Mercer County in numbersOfficial sources, refreshed yearly
| Census | Population |
|---|---|
| 2000 | 16,957 |
| 2010 | 16,434 |
| 2020 | 15,699 |
As counted at each census, within the boundaries the area had then; the current estimate is in the glance card.
Sources: Census 2000 Summary File 1: total population, county level, state 17, retrieved November 14, 2026; Census 2010 Summary File 1: total population, county level, state 17, retrieved November 14, 2026; Census 2020 Redistricting Data (P.L. 94-171): total population, county level, state 17, retrieved November 14, 2026.
Median household income $71,710 · Share of households by income, American Community Survey 5-year 2019-2023, table S1901.
Source: American Community Survey 5-year subject table S1901 (household income) 2019–2023, county level, state 17, retrieved November 14, 2026.
- Owner occupied
- 5,305 units
- Renter occupied
- 1,108 units
- Vacancy rate
- 11.9%
Occupied housing units by tenure and the share of all units vacant, American Community Survey 5-year 2019-2023, table DP04.
Source: American Community Survey 5-year data profile 2019–2023, county level, state 17, retrieved November 14, 2026.
2,200 employees in 258 establishments with payroll in 2023, all sectors; employers themselves are not named in the source. County Business Patterns counts are published with noise.
Source: County Business Patterns 2023: employment by sector, county level, state 17, retrieved November 14, 2026.
| Measure | Mercer County | Illinois |
|---|---|---|
| Population | 15,619 | 12,692,653 |
| Median household income | $71,710 | $81,702 |
| Median age | 44.5 | 38.9 |
| Median home value | $139,300 | $250,500 |
| Bachelor’s degree or higher | 18.9% | 37.2% |
| Foreign-born residents | 1.1% | 14.4% |
| Owner-occupied homes | 82.7% | 66.8% |
| Mean commute to work | 28.5 minutes | 28.1 minutes |
Source: American Community Survey 5-year data profile 2019–2023, county level, state 17, retrieved November 14, 2026.
Townships, towns and villages in Mercer County31 with a page · sort by any column
| Type | |||
|---|---|---|---|
| Mercer Township | Township | 3,857 | 35.4 sq mi |
| Aledo | City | 3,522 | 2.34 sq mi |
| Richland Grove Township | Township | 2,271 | 36.4 sq mi |
| Preemption Township | Township | 1,639 | 36.8 sq mi |
| Greene Township | Township | 1,408 | 36.7 sq mi |
| New Boston Township | Township | 1,145 | 50.7 sq mi |
| Rivoli Township | Township | 1,025 | 35.0 sq mi |
| Viola | Village | 843 | 0.84 sq mi |
| Matherville | Village | 690 | 0.39 sq mi |
| Sherrard | Village | 688 | 0.93 sq mi |
| Windsor | Village | 652 | 0.44 sq mi |
| Keithsburg Township | Township | 640 | 18.0 sq mi |
| Millersburg Township | Township | 609 | 36.3 sq mi |
| New Boston | City | 605 | 0.94 sq mi |
| Suez Township | Township | 590 | 37.1 sq mi |
| Keithsburg | City | 545 | 2.56 sq mi |
| Perryton Township | Township | 444 | 36.4 sq mi |
| Eliza Township | Township | 401 | 57.4 sq mi |
| North Henderson Township | Township | 378 | 35.0 sq mi |
| Abington Township | Township | 362 | 36.6 sq mi |
| Joy | Village | 359 | 0.43 sq mi |
| Ohio Grove Township | Township | 266 | 36.8 sq mi |
| Duncan Township | Township | 257 | 36.6 sq mi |
| Seaton | Village | 206 | 1.58 sq mi |
| North Henderson | Village | 159 | 0.23 sq mi |
| Preemption | Census designated place | 100 | 1.11 sq mi |
| Cable | Census designated place | 83 | 1.14 sq mi |
| Millersburg | Census designated place | 36 | 0.30 sq mi |
| Swedona | Census designated place | 28 | 0.28 sq mi |
| Eliza | Census designated place | 0 | 0.13 sq mi |
| Hamlet | Census designated place | 0 | 0.45 sq mi |
Populations: Census Population Estimates, Vintage 2024: subcounty totals, state 17 (2024). Land areas: Census Gazetteer 2025: counties. A dash means the figure is not in the cited file.
County officialsFrom public records
No county official is published yet. Names appear once a researcher drafts them from the county’s own site and a second person approves; office contacts only, never personal details.
Across Mercer County
No job is posted in Mercer County’s towns yet. Employers post from their business dashboard; public job banks are added once their terms are recorded.
No upcoming event is listed in Mercer County's towns yet. Members and businesses add events from any town page.
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Neighboring counties
Neighboring counties
- Des Moines CountyPopulation 38,411 (2024 estimate)
- Henderson CountyPopulation 6,048 (2024 estimate)
- Henry CountyPopulation 48,177 (2024 estimate)
- Knox CountyPopulation 48,716 (2024 estimate)
- Louisa CountyPopulation 10,630 (2024 estimate)
- Rock Island CountyPopulation 142,731 (2024 estimate)
- Warren CountyPopulation 16,217 (2024 estimate)
Sources: Census county adjacency file 2024, retrieved November 14, 2026; Census Population Estimates, Vintage 2024: subcounty totals, state 19, retrieved November 14, 2026; Census Population Estimates, Vintage 2024: subcounty totals, state 17, retrieved November 14, 2026.