Adams County, Pennsylvania
County seat: Gettysburg · Population 107,594 (2025) · 519 sq mi
Adams County is the 31st most populous of Pennsylvania's 67 counties, with 107,594 people (2025 estimate). Its county seat is Gettysburg. It is part of the District 8 region, one of the 11 PennDOT engineering districts. The map shows its 13 cities and towns and the 5 neighboring counties.
Adams County facts
- County seat
- Gettysburg
- Population (2025 estimate)
- 107,594 +3.6% since 2020
- Land area
- 519 sq mi 45th largest of 67
- Water area
- 3 sq mi
- Population density
- 208 per sq mi
- Established
- 1800
- Same name
- One of 12 Adams Counties in the US
- Named after
- John Adams Founding Father, U.S. president from 1797 to 1801 (1735–1826)
- Largest city
- Gettysburg 8,365
- Median household income
- $84,092
- Cities and towns
- 13 plus 13 CDPs
- ZIP codes
- 18
- Time zone
- Eastern
- FIPS code
- 42001
Cities and towns in Adams County
Adams County has 13 incorporated cities, towns and villages. Populations count the people living inside Adams County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Gettysburg (county seat) | Borough | 8,365 | |
| Littlestown | Borough | 4,895 | |
| Carroll Valley | Borough | 4,051 | |
| McSherrystown | Borough | 3,150 | |
| New Oxford | Borough | 1,912 | |
| Bonneauville | Borough | 1,802 | |
| East Berlin | Borough | 1,582 | |
| Biglerville | Borough | 1,240 | |
| Abbottstown | Borough | 1,048 | |
| Arendtsville | Borough | 890 | |
| Bendersville | Borough | 757 | |
| York Springs | Borough | 699 | |
| Fairfield | Borough | 542 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Lake Heritage | 2,997 | |
| Lake Meade | 2,176 | |
| Hampton | 1,404 | |
| Midway | 860 | |
| McKnightstown | 695 | |
| Heidlersburg | 457 | |
| Aspers | 405 | |
| Cashtown | 346 | |
| Orrtanna | 143 | |
| Hunterstown | 137 | |
| Idaville | 105 | |
| Table Rock | 98 | |
| Gardners | 76 |
ZIP codes in Adams County
18 ZIP codes reach into Adams County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 17019 also York and Cumberland counties
- 17222 also Franklin County
- 17301 also York County
- 17303
- 17304
- 17306
- 17307 also Cumberland County
- 17316 also York County
- 17320
- 17324 also Cumberland County
- 17325
- 17331 also York County
- 17340
- 17343
- 17344
- 17350
- 17353
- 17372 also York County
Population of Adams County, 2020–2025
Adams County grew by 3,740 people (+3.6%) between April 2020 and July 2025: 1,522 more deaths than births and a net gain of 5,359 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 103,814 |
| 2021 | 105,728 |
| 2022 | 105,994 |
| 2023 | 106,945 |
| 2024 | 107,155 |
| 2025 | 107,594 |
Neighboring counties
- York County east · 473,197 people
- Cumberland County north · 277,270 people
- Franklin County west · 160,652 people
- Frederick County, Maryland south · 302,883 people
- Carroll County, Maryland southeast · 176,677 people
Printable Adams 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) (111 KB)
- PNG (2400 px) (90 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.
Back to the Pennsylvania county map with all 67 counties. Found an error? Tell us.