Menard County, Illinois
County seat: Petersburg · Population 11,863 (2025) · 314 sq mi
Menard County is the 83rd most populous of Illinois's 102 counties, with 11,863 people (2025 estimate). Its county seat is Petersburg. It is part of the Central region, one of the 10 Illinois economic development regions (DCEO). The map shows its 5 cities and towns and the 4 neighboring counties.
Menard County facts
- County seat
- Petersburg
- Population (2025 estimate)
- 11,863 −3.5% since 2020
- Land area
- 314 sq mi 90th largest of 102
- Water area
- 1 sq mi
- Population density
- 38 per sq mi
- Established
- 1839
- Named after
- Pierre Menard fur trader and US political figure
- Largest city
- Petersburg 2,125
- Median household income
- $82,176
- Cities and towns
- 5 plus 1 CDPs
- ZIP codes
- 8
- Time zone
- Central
- FIPS code
- 17129
Cities and towns in Menard County
Menard County has 5 incorporated cities, towns and villages. Populations count the people living inside Menard County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Petersburg (county seat) | City | 2,125 | |
| Athens | City | 1,883 | |
| Greenview | Village | 718 | |
| Tallula | Village | 420 | |
| Oakford | Village | 224 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Lake Petersburg | 928 |
ZIP codes in Menard County
8 ZIP codes reach into Menard County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 62613 also Sangamon and Logan counties
- 62642
- 62666 also Logan County
- 62673 also Cass County
- 62675 also Cass County
- 62677 also Sangamon County
- 62688
- 62693 also Sangamon and Logan counties
Population of Menard County, 2020–2025
Menard County shrank by 434 people (−3.5%) between April 2020 and July 2025: 155 more deaths than births and a net loss of 273 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 12,273 |
| 2021 | 12,174 |
| 2022 | 12,074 |
| 2023 | 12,009 |
| 2024 | 11,924 |
| 2025 | 11,863 |
Neighboring counties
- Mason County northwest · 12,411 people
- Sangamon County south · 194,170 people
- Cass County west · 12,463 people
- Logan County east · 27,182 people
Printable Menard County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (81 KB)
- PNG (2400 px) (63 KB)
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Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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