Marshall County, Indiana
County seat: Plymouth · Population 46,599 (2025) · 444 sq mi
Marshall County is the 32nd most populous of Indiana's 92 counties, with 46,599 people (2025 estimate). Its county seat is Plymouth. It is part of the Northern (Region 2) region, one of the 12 Indiana economic growth regions (DWD / WorkOne regions). The map shows its 6 cities and towns and the 6 neighboring counties.
Marshall County facts
- County seat
- Plymouth
- Population (2025 estimate)
- 46,599 +1.1% since 2020
- Land area
- 444 sq mi 24th largest of 92
- Water area
- 6 sq mi
- Population density
- 105 per sq mi
- Established
- 1835
- Named after
- John Marshall chief justice of the United States from 1801 to 1835, (1755-1835)
- Largest city
- Plymouth 11,081
- Median household income
- $71,808
- Cities and towns
- 6 plus 6 CDPs
- ZIP codes
- 15
- Time zone
- Eastern
- FIPS code
- 18099
Cities and towns in Marshall County
Marshall County has 6 incorporated cities, towns and villages. Populations count the people living inside Marshall County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Plymouth (county seat) | City | 11,081 | |
| Bremen | Town | 4,592 | |
| Argos | Town | 1,761 | |
| Bourbon | Town | 1,674 | |
| Culver | Town | 1,256 | |
| La Paz | Town | 467 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Lake of the Woods | 663 | |
| Tippecanoe | 378 | |
| Tyner | 200 | |
| Koontz Lake | 128 | Starke County |
| Donaldson | 62 | |
| Teegarden | 35 |
ZIP codes in Marshall County
15 ZIP codes reach into Marshall County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 46501 also Fulton County
- 46504 also Kosciusko County
- 46506 also St. Joseph and Kosciusko counties
- 46511 also Starke, Fulton and Pulaski counties
- 46513
- 46524 also Kosciusko County
- 46531 also Starke County
- 46536 also St. Joseph County
- 46537
- 46539 also Kosciusko and Fulton counties
- 46550 also Elkhart, Kosciusko and St. Joseph counties
- 46563 also Starke and St. Joseph counties
- 46570 also Fulton County
- 46572
- 46574 also LaPorte, St. Joseph and Starke counties
Population of Marshall County, 2020–2025
Marshall County grew by 520 people (+1.1%) between April 2020 and July 2025: 33 more deaths than births and a net gain of 556 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 46,064 |
| 2021 | 46,106 |
| 2022 | 46,321 |
| 2023 | 46,269 |
| 2024 | 46,538 |
| 2025 | 46,599 |
Neighboring counties
- St. Joseph County north · 272,861 people
- Fulton County south · 20,091 people
- Kosciusko County east · 80,892 people
- Starke County west · 23,425 people
- Elkhart County northeast · 208,774 people
- Pulaski County southwest · 12,463 people
Printable Marshall 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) (91 KB)
- PNG (2400 px) (66 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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