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County · code 42123

Warren CountyPennsylvania

Warren County is a county in Pennsylvania, formed in 1800 from Allegheny and Lycoming counties, with its seat in Warren.

  • Founded1800
  • County seatWarren
  • Named forJoseph Warren
  • Land area884 sq mi + 14 sq mi water
  • Population38,587 2020 Census
  • Parcels mapped31,245 checked 15 October 2026
Open the free map Click any parcel in Warren County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

ForestChautauqua, NYVenangoMcKeanCattaraugus, NYCrawfordErie Warren Census outline · seat marked

Where it is

Warren on the map of Pennsylvania

Pennsylvania has 67 counties and county equivalents, each with its own records office. Shapes with a page are links.

Adams CountyAllegheny CountyArmstrong CountyBeaver CountyBedford CountyBerks CountyBlair CountyBradford CountyBucks CountyButler CountyCambria CountyCameron CountyCarbon CountyCentre CountyChester CountyClarion CountyClearfield CountyClinton CountyColumbia CountyCrawford CountyCumberland CountyDauphin CountyDelaware CountyElk CountyErie CountyFayette CountyForest CountyFranklin CountyFulton CountyGreene CountyHuntingdon CountyIndiana CountyJefferson CountyJuniata CountyLackawanna CountyLancaster CountyLawrence CountyLebanon CountyLehigh CountyLuzerne CountyLycoming CountyMcKean CountyMercer CountyMifflin CountyMonroe CountyMontgomery CountyMontour CountyNorthampton CountyNorthumberland CountyPerry CountyPhiladelphia CountyPike CountyPotter CountySchuylkill CountySnyder CountySomerset CountySullivan CountySusquehanna CountyTioga CountyUnion CountyVenango CountyWashington CountyWayne CountyWestmoreland CountyWyoming CountyYork CountyWarren County Warren
Counties of Pennsylvania · Warren highlighted

History

Formed in 1800 from Allegheny County, Lycoming County and Crawford County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Warren County was created from Allegheny and Lycoming counties on March 12, 1800, but remained incompletely organized and attached to Crawford County. On April 1, 1805, Warren was detached from Crawford and attached to Venango County, though it maintained an indirect connection to Crawford through Venango until September 1, 1805. Warren County became fully organized and independent on October 1, 1819, when it was detached from Venango County. In 1845, Warren County gained territory from McKean County.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1800
    Warren County created Warren created from Allegheny and Lycoming; not fully organized, attached to Crawford.
    from Alleghenyfrom Lycomingfrom Crawford
    · Pa. Stat., ch. 2130, pp. 457-458, 460-461
  2. 1805
    Changed Warren detached from Crawford, attached to Venango (but Warren remained indirectly attached to Crawford, through Venango, until 1 Sep 1805).
    CrawfordVenango
    · Pa. Stat., ch. 2600, sec. 6/17:1033
  3. 1819
    Changed Warren fully organized, detached from Venango.
    Venango
    · Pa. Laws 1818-1819, ch. 72, secs. 1-2/p. 102
  4. 1845
    Gained territory Warren gained from McKean.
    from McKean
    · Pa. Laws 1845, no. 350, sec. 1/p. 541
  5. 1847
    Boundary clarified Boundary between Warren and McKean clarified (no change).
    with McKeanno change
    · Pa. Laws 1847, no. 104, sec. 5/p. 147

Land and parcels

What the maps cover in Warren

Who publishes each layer, how good it is, and when we last checked.

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

Warren by the Census

Population
38,587 2020 Census count
Housing units
21,587 2020 Census count
Land area
884 square miles
Water area
14 square miles
People per sq mi
44 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Warren County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

Open Warren 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.

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Questions

Common questions about Warren County

When was Warren County founded?
Warren County was founded in 1800, formed from Allegheny County, Lycoming County and Crawford County, and named after Joseph Warren.
What is the county seat of Warren County?
The county seat of Warren County is Warren.
Is there an online parcel map for Warren County?
Yes. Warren County publishes a parcel map of 31,245 parcels, rated fallback here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Warren County's boundary or name changed?
Warren County was created in 1800 from Allegheny County, Lycoming County and Crawford County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Venango County, Crawford County and McKean County.
Is my lot in a flood zone?
We do not have flood maps for Warren County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door