Logan County, Illinois
County seat: Lincoln · Population 27,182 (2025) · 618 sq mi
Logan County is the 49th most populous of Illinois's 102 counties, with 27,182 people (2025 estimate). Its county seat is Lincoln. It is part of the Central region, one of the 10 Illinois economic development regions (DCEO). The map shows its 11 cities and towns and the 7 neighboring counties.
Logan County facts
- County seat
- Lincoln
- Population (2025 estimate)
- 27,182 −2.9% since 2020
- Land area
- 618 sq mi 33rd largest of 102
- Water area
- 1 sq mi
- Population density
- 44 per sq mi
- Established
- 1839
- Same name
- One of 10 Logan Counties in the US
- Named after
- John A. Logan American soldier and politician (1826–1886)
- Largest city
- Lincoln 12,981
- Median household income
- $66,358
- Cities and towns
- 11 plus 3 CDPs
- ZIP codes
- 20
- Time zone
- Central
- FIPS code
- 17107
Cities and towns in Logan County
Logan County has 11 incorporated cities, towns and villages. Populations count the people living inside Logan County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Lincoln (county seat) | City | 12,981 | |
| Atlanta | City | 1,626 | |
| Mount Pulaski | City | 1,499 | |
| Emden | Village | 452 | |
| Elkhart | Village | 437 | |
| Latham | Village | 321 | |
| Middletown | Village | 317 | |
| New Holland | Village | 262 | |
| Hartsburg | Village | 255 | |
| San Jose | Village | 183 | Mason County |
| Broadwell | Village | 138 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Chestnut | 347 | |
| Beason | 142 | |
| Cornland | 24 |
ZIP codes in Logan County
20 ZIP codes reach into Logan County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 61721 also Tazewell County
- 61723 also McLean County
- 61749 also De Witt and Macon counties
- 61751
- 61754 also McLean and De Witt counties
- 62512 also De Witt County
- 62518
- 62519
- 62541
- 62543 also Macon County
- 62548 also Sangamon County
- 62613 also Menard and Sangamon counties
- 62634
- 62635 also Tazewell County
- 62643
- 62656
- 62666 also Menard County
- 62671 also Mason County
- 62682 also Mason and Tazewell counties
- 62693 also Sangamon and Menard counties
Population of Logan County, 2020–2025
Logan County shrank by 806 people (−2.9%) between April 2020 and July 2025: 617 more deaths than births and a net loss of 141 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 27,892 |
| 2021 | 27,253 |
| 2022 | 27,210 |
| 2023 | 27,037 |
| 2024 | 27,219 |
| 2025 | 27,182 |
Neighboring counties
- Sangamon County southwest · 194,170 people
- Tazewell County north · 130,049 people
- De Witt County east · 15,118 people
- Mason County west · 12,411 people
- Macon County southeast · 99,300 people
- Menard County west · 11,863 people
- McLean County northeast · 171,419 people
Printable Logan 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) (94 KB)
- PNG (2400 px) (70 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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