Cass County, Illinois
County seat: Virginia · Population 12,463 (2025) · 376 sq mi
Cass County is the 81st most populous of Illinois's 102 counties, with 12,463 people (2025 estimate). Its county seat is Virginia. 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 6 neighboring counties.
Cass County facts
- County seat
- Virginia
- Population (2025 estimate)
- 12,463 −4.4% since 2020
- Land area
- 376 sq mi 79th largest of 102
- Water area
- 8 sq mi
- Population density
- 33 per sq mi
- Established
- 1837
- Same name
- One of 9 Cass Counties in the US
- Named after
- Lewis Cass American politician (1782-1866)
- Largest city
- Beardstown 5,691
- Median household income
- $68,125
- Cities and towns
- 5
- ZIP codes
- 8
- Time zone
- Central
- FIPS code
- 17017
Cities and towns in Cass County
Cass County has 5 incorporated cities, towns and villages. Populations count the people living inside Cass County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Beardstown | City | 5,691 | |
| Virginia (county seat) | City | 1,442 | |
| Ashland | Village | 1,162 | |
| Chandlerville | Village | 508 | |
| Arenzville | Village | 355 |
ZIP codes in Cass County
8 ZIP codes reach into Cass County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 62611 also Morgan County
- 62612 also Morgan County
- 62618
- 62622
- 62627 also Mason County
- 62673 also Menard County
- 62675 also Menard County
- 62691
Population of Cass County, 2020–2025
Cass County shrank by 574 people (−4.4%) between April 2020 and July 2025: 17 more births than deaths and a net loss of 586 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 12,978 |
| 2021 | 12,782 |
| 2022 | 12,657 |
| 2023 | 12,716 |
| 2024 | 12,530 |
| 2025 | 12,463 |
Neighboring counties
- Mason County northeast · 12,411 people
- Morgan County south · 32,515 people
- Schuyler County northwest · 6,657 people
- Menard County east · 11,863 people
- Brown County west · 6,401 people
- Sangamon County southeast · 194,170 people
Printable Cass 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) (92 KB)
- PNG (2400 px) (71 KB)
Paste this code to embed the map on your site:
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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