County · code 42113
Sullivan CountyPennsylvania
Sullivan County is a county in Pennsylvania with its county seat in Laporte. It was formed in 1848 from Lycoming County and named after John Sullivan.
- Founded1848
- County seatLaporte
- Named forJohn Sullivan
- Land area450 sq mi + 2.6 sq mi water
- Population5,840 2020 Census
- Parcels mapped8,709 checked 16 October 2026
Where it is
Sullivan 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 1848 from Lycoming County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Sullivan County was created from Lycoming County on January 3, 1848.
- 1848Sullivan County created Sullivan created from Lycoming. · Pa. Laws 1847, no. 365, secs. 1-2/p. 462
Land and parcels
What the maps cover in Sullivan
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 8,709 parcels from Sullivan County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 7 October 2026 · checked 16 October 2026 -
Address points Missing
No public address points layer found for Sullivan 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
Sullivan 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
Sullivan 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 Sullivan County.
See your own lot on these maps
Open Sullivan 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 Sullivan County
- When was Sullivan County founded?
- Sullivan County was founded in 1848, formed from Lycoming County, and named after John Sullivan.
- What is the county seat of Sullivan County?
- The county seat of Sullivan County is Laporte.
- Is there an online parcel map for Sullivan County?
- Yes. Sullivan County publishes a parcel map of 8,709 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Sullivan County's boundary or name changed?
- Sullivan County was created in 1848 from Lycoming County. The Atlas of Historical County Boundaries records no boundary change since.
- Is my lot in a flood zone?
- We do not have flood maps for Sullivan County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby