County · code 42001
Adams CountyPennsylvania
Adams County is in Pennsylvania and has its county seat in Gettysburg. It was created on January 22, 1800, from York County and named after John Adams.
- Founded1800
- County seatGettysburg
- Named forJohn Adams
- Land area519 sq mi + 3 sq mi water
- Population103,852 2020 Census
- Parcels mapped46,916 checked 15 October 2026
Where it is
Adams on the map of Pennsylvania
Pennsylvania has 67 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1800 from York County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Adams County was created from York County in 1800. In 1838, a small area was gained from Franklin County.
- 1800
- 1832Boundary clarified Boundary between Adams and Cumberland redefined (no change).with Cumberlandno change· Pa. Laws 1831-1832, no. 175, secs. 21, 24/pp. 457-458
- 1838Gained territory Adams gained small area from Franklin. · Pa. Laws 1837-1838, no. 94, sec. 93/p. 607
Land and parcels
What the maps cover in Adams
Who publishes each layer, how good it is, and when we last checked.
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Parcels Good enough
Lot lines and tax-map numbers for 46,916 parcels from Adams County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 15 October 2026 -
Address points Missing
No public address points layer found for Adams County yet.
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Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- Official
- from the office that keeps the record
- Good enough
- a reliable statewide or national copy
- Fallback
- a guide only; check the official record
- Missing
- nothing public found yet
People and land
Adams by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
Adams County's official site
We have found the county's site but not its offices yet; start there.
County government
- County government
The official website of Adams County.
See your own lot on these maps
Open Adams County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.
Questions
Common questions about Adams County
- When was Adams County founded?
- Adams County was founded in 1800, formed from York County, and named after John Adams.
- What is the county seat of Adams County?
- The county seat of Adams County is Gettysburg.
- Is there an online parcel map for Adams County?
- Yes. Adams County publishes a parcel map of 46,916 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Adams County's boundary or name changed?
- Adams County was created in 1800 from York County. Since then the Atlas of Historical County Boundaries records 1 later change, most of them small boundary adjustments, chiefly involving Franklin County.
- Is my lot in a flood zone?
- We do not have flood maps for Adams County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby