Grundy County, Illinois
County seat: Morris · Population 54,052 (2025) · 418 sq mi
Grundy County is the 25th most populous of Illinois's 102 counties, with 54,052 people (2025 estimate). Its county seat is Morris. It is part of the Northeast region, one of the 10 Illinois economic development regions (DCEO). The map shows its 17 cities and towns and the 5 neighboring counties.
Grundy County facts
- County seat
- Morris
- Population (2025 estimate)
- 54,052 +2.8% since 2020
- Land area
- 418 sq mi 69th largest of 102
- Water area
- 12 sq mi
- Population density
- 129 per sq mi
- Established
- 1841
- Same name
- One of 4 Grundy Counties in the US
- Named after
- Felix Grundy American politician (1777-1840)
- Largest city
- Morris 14,669
- Median household income
- $92,235
- Cities and towns
- 17
- ZIP codes
- 16
- Time zone
- Central
- FIPS code
- 17063
Cities and towns in Grundy County
Grundy County has 17 incorporated cities, towns and villages. Populations count the people living inside Grundy County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Morris (county seat) | City | 14,669 | |
| Minooka | Village | 9,763 | Kendall and Will counties |
| Coal City | Village | 5,828 | Will County |
| Channahon | Village | 4,561 | Will County |
| Diamond | Village | 2,709 | Will County |
| Gardner | Village | 1,366 | |
| Mazon | Village | 984 | |
| Braceville | Village | 732 | Will County |
| South Wilmington | Village | 719 | |
| Carbon Hill | Village | 381 | |
| Verona | Village | 207 | |
| Kinsman | Village | 91 | |
| East Brooklyn | Village | 75 | |
| Godley | Village | 53 | Will County |
| Dwight | Village | 14 | Livingston County |
| Seneca | Village | 8 | LaSalle County |
| Braidwood | City | 7 | Will County |
ZIP codes in Grundy County
16 ZIP codes reach into Grundy County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 60407 also Will County
- 60410 also Will County
- 60416 also Will County
- 60420 also Livingston County
- 60424 also Kankakee County
- 60437
- 60444
- 60447 also Kendall and Will counties
- 60450 also Kendall County
- 60470 also LaSalle and Livingston counties
- 60474
- 60479
- 60481 also Will and Kankakee counties
- 60541 also Kendall and LaSalle counties
- 60961 also Kankakee and Livingston counties
- 61360 also LaSalle County
Population of Grundy County, 2020–2025
Grundy County grew by 1,493 people (+2.8%) between April 2020 and July 2025: 34 more births than deaths and a net gain of 1,471 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 52,538 |
| 2021 | 52,992 |
| 2022 | 53,145 |
| 2023 | 53,550 |
| 2024 | 53,721 |
| 2025 | 54,052 |
Neighboring counties
- LaSalle County west · 107,773 people
- Will County northeast · 712,253 people
- Kendall County north · 145,470 people
- Livingston County south · 35,057 people
- Kankakee County east · 105,525 people
Printable Grundy 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) (96 KB)
- PNG (2400 px) (80 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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