Forest County, Pennsylvania
County seat: Tionesta · Population 6,614 (2025) · 427 sq mi
Forest County is the 65th most populous of Pennsylvania's 67 counties, with 6,614 people (2025 estimate). Its county seat is Tionesta. It is part of the District 1 region, one of the 11 PennDOT engineering districts. The map shows its 1 city or town and the 6 neighboring counties.
Forest County facts
- County seat
- Tionesta
- Population (2025 estimate)
- 6,614 −5.3% since 2020
- Land area
- 427 sq mi 53rd largest of 67
- Water area
- 3 sq mi
- Population density
- 16 per sq mi
- Established
- 1848
- Named after
- forest subjective characterization of an area with trees
- Largest city
- Jenks 3,662
- Median household income
- $52,191
- Cities and towns
- 1 plus 1 CDPs
- ZIP codes
- 11
- Time zone
- Eastern
- FIPS code
- 42053
Cities and towns in Forest County
Forest County has 1 incorporated place. Populations count the people living inside Forest County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Tionesta (county seat) | Borough | 399 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Marienville | 3,163 |
ZIP codes in Forest County
11 ZIP codes reach into Forest County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 15828 also Jefferson County
- 16217 also Clarion County
- 16239
- 16260 also Clarion County
- 16321
- 16322
- 16341 also Venango County
- 16347 also Warren County
- 16351 also Warren County
- 16353 also Clarion and Venango counties
- 16370
Population of Forest County, 2020–2025
Forest County shrank by 373 people (−5.3%) between April 2020 and July 2025: 395 more deaths than births and a net loss of 7 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 6,972 |
| 2021 | 6,905 |
| 2022 | 6,615 |
| 2023 | 6,474 |
| 2024 | 6,595 |
| 2025 | 6,614 |
Neighboring counties
- Warren County north · 37,038 people
- Elk County east · 29,926 people
- Clarion County south · 36,680 people
- Venango County west · 49,346 people
- Jefferson County southeast · 43,255 people
- McKean County northeast · 38,984 people
Printable Forest 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) (65 KB)
- PNG (2400 px) (56 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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