Kendall County, Illinois
County seat: Yorkville · Population 145,470 (2025) · 320 sq mi
Kendall County is the 14th most populous of Illinois's 102 counties, with 145,470 people (2025 estimate). Its county seat is Yorkville. It is part of the Northeast region, one of the 10 Illinois economic development regions (DCEO). The map shows its 15 cities and towns and the 6 neighboring counties.
Kendall County facts
- County seat
- Yorkville
- Population (2025 estimate)
- 145,470 +10.3% since 2020
- Land area
- 320 sq mi 89th largest of 102
- Water area
- 2 sq mi
- Population density
- 454 per sq mi
- Established
- 1841
- Named after
- Amos Kendall American politician (1789–1869)
- Largest city
- Oswego 39,948 in the county
- Median household income
- $111,601
- Cities and towns
- 15 plus 1 CDPs
- ZIP codes
- 19
- Time zone
- Central
- FIPS code
- 17093
Cities and towns in Kendall County
Kendall County has 15 incorporated cities, towns and villages. Populations count the people living inside Kendall County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Oswego | Village | 39,948 | Will County |
| Yorkville (county seat) | City | 26,730 | |
| Joliet | City | 14,550 | Will County |
| Plano | City | 12,677 | |
| Montgomery | Village | 12,419 | Kane County |
| Aurora | City | 6,501 | DuPage, Kane and Will counties |
| Plainfield | Village | 3,390 | Will County |
| Minooka | Village | 1,149 | Grundy and Will counties |
| Newark | Village | 984 | |
| Millbrook | Village | 291 | |
| Lisbon | Village | 267 | |
| Plattville | Village | 220 | |
| Millington | Village | 209 | LaSalle County |
| Sandwich | City | 171 | DeKalb County |
| Shorewood | Village | 0 | Will County |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Boulder Hill | 8,989 |
ZIP codes in Kendall County
19 ZIP codes reach into Kendall County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 60431 also Will County
- 60447 also Grundy and Will counties
- 60450 also Grundy County
- 60503 also Will County
- 60504 also DuPage and Kane counties
- 60506 also Kane County
- 60512
- 60536
- 60537 also LaSalle County
- 60538 also Kane County
- 60541 also Grundy and LaSalle counties
- 60543 also Will and Kane counties
- 60544 also Will County
- 60545
- 60548 also DeKalb and LaSalle counties
- 60554 also Kane County
- 60560
- 60585 also Will County
- 60586 also Will County
Population of Kendall County, 2020–2025
Kendall County grew by 13,594 people (+10.3%) between April 2020 and July 2025: 3,997 more births than deaths and a net gain of 9,584 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 132,364 |
| 2021 | 135,058 |
| 2022 | 137,557 |
| 2023 | 140,224 |
| 2024 | 143,125 |
| 2025 | 145,470 |
Neighboring counties
- Will County east · 712,253 people
- Grundy County south · 54,052 people
- Kane County north · 525,757 people
- LaSalle County southwest · 107,773 people
- DeKalb County northwest · 101,835 people
- DuPage County northeast · 934,298 people
Printable Kendall 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) (101 KB)
- PNG (2400 px) (75 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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