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County · code 42129

Westmoreland CountyPennsylvania

Westmoreland County is a county in Pennsylvania with a seat in Greensburg, formed in 1773.

  • Founded1773
  • County seatGreensburg
  • Named forWestmorland, England
  • Land area1,028 sq mi + 8.2 sq mi water
  • Population354,663 2020 Census
  • Parcels mapped198,609 checked 15 October 2026
Open the free map Click any parcel in Westmoreland County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

FayetteArmstrongIndianaAlleghenySomersetButlerCambriaWashington Greensburg Census outline · seat marked

Where it is

Westmoreland 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 CountyWarren CountyWashington CountyWayne CountyWyoming CountyYork CountyWestmoreland County Westmoreland
Counties of Pennsylvania · Westmoreland highlighted

History

Formed in 1773 from Bedford County

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

Westmoreland County was formed in 1773 from Bedford County, and named after Westmorland, England. Greensburg is the county seat.

Deeds and plats from before 1773 for land now in Westmoreland County may have been recorded in Bedford County.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries; the 5 that matter most are shown first.

  1. 1773
    Westmoreland County created Westmoreland created from Bedford.
    from Bedford
    · Pa. Stat., ch. 678, sec. 1/8:314
  2. 1776
    Westmoreland County created Westmoreland overlapped by Monongalia (West Virginia), Ohio (West Virginia), and Yohogania (extinct), all created by Virginia to replace West Augusta District.
    from Monongalia (W.Va.)from Ohio (W.Va.)from Yohogania
    · Cappon, Petchenik, and Long, 93; Hening, 9:262-274
  3. 1781
    Lost territory Westmoreland lost to the creation of Washington.
    to Washington
    · Pa. Stat., ch. 931, sec. 1/10:272-273
  4. 1783
    Lost territory Westmoreland lost to the creation of Fayette.
    to Fayette
    · Pa. Stat., ch. 1016, sec. 1/11:197
  5. 1784
    Lost territory Westmoreland lost to Fayette.
    to Fayette
    · Pa. Stat., ch. 1068, sec. 1/11:234
Show all 17 changes (12 more)
  1. 1773
    Westmoreland County created Westmoreland created from Bedford.
    from Bedford
    · Pa. Stat., ch. 678, sec. 1/8:314
  2. 1773
    Changed Westmoreland overlapped by West Augusta District (Virginia) when Virginia asserted its control over the Pittsburgh region. · Abernethy, 94
  3. 1776
    Westmoreland County created Westmoreland overlapped by Monongalia (West Virginia), Ohio (West Virginia), and Yohogania (extinct), all created by Virginia to replace West Augusta District.
    from Monongalia (W.Va.)from Ohio (W.Va.)from Yohogania
    · Cappon, Petchenik, and Long, 93; Hening, 9:262-274
  4. 1780
    Changed Westmoreland overlap by Monongalia (West Virginia), Ohio (West Virginia), and Yohogania (extinct) ended when Virginia gave up claim to area.
    Monongalia (W.Va.)Ohio (W.Va.)Yohogania
    · Crumrine, "Boundary Controversy," 521-523; Van Zandt, 83
  5. 1781
    Lost territory Westmoreland lost to the creation of Washington.
    to Washington
    · Pa. Stat., ch. 931, sec. 1/10:272-273
  6. 1783
    Lost territory Westmoreland lost to the creation of Fayette.
    to Fayette
    · Pa. Stat., ch. 1016, sec. 1/11:197
  7. 1784
    Lost territory Westmoreland lost to Fayette.
    to Fayette
    · Pa. Stat., ch. 1068, sec. 1/11:234
  8. 1785
    Gained territory Westmoreland gained from Non-County Area 1; Non-County Area 1 eliminated. · Pa. Stat., ch. 1164, sec. 15/11:595
  9. 1788
    Lost territory Westmoreland lost to the creation of Allegheny.
    to Allegheny
    · Pa. Stat., ch. 1359, sec. 1/13:84-85
  10. 1800
    Lost territory Westmoreland lost to the creation of Armstrong; Armstrong attached to Westmoreland.
    to Armstrong
    · Pa. Stat., ch. 2130, pp. 459-460
  11. 1803
    Lost territory Westmoreland lost to the creation of Indiana; Indiana attached to Westmoreland.
    to Indiana
    · Pa. Stat., ch. 2374, secs. 1, 3/17:434-435
  12. 1804
    Changed Jefferson attached to Westmoreland.
    Jefferson
    · Pa. Stat., ch. 2478, secs. 1, 13/pp. 769-770, 774
  13. 1805
    Changed Armstrong detached from Westmoreland.
    Armstrong
    · Pa. Stat., ch. 2553, sec. 1/17:920
  14. 1806
    Changed Jefferson detached from Westmoreland (but Jefferson remained indirectly attached to Westmoreland, through Indiana, until 3 Nov 1806).
    JeffersonIndiana
    · Pa. Stat., ch. 2665, sec. 9/18:123-124
  15. 1806
    Changed Indiana detached from Westmoreland.
    Indiana
    · Pa. Stat., ch. 2665, sec. 1/18:120
  16. 1807
    Changed Middle of Monongahela River fixed as boundary of adjoining counties, including Westmoreland (no change). · Pa. Stat., ch. 2863, sec. 1/18:644
  17. 1840
    Boundary clarified Boundary between Westmoreland and Armstrong clarified (no change).
    with Armstrongno change
    · Pa. Laws 1840, no. 73, sec. 1/p. 167

Land and parcels

What the maps cover in Westmoreland

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

Westmoreland by the Census

Population
354,663 2020 Census count
Housing units
167,776 2020 Census count
Land area
1,028 square miles
Water area
8.2 square miles
People per sq mi
345 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

Westmoreland 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

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Questions

Common questions about Westmoreland County

When was Westmoreland County founded?
Westmoreland County was founded in 1773, formed from Bedford County, and named after Westmorland, England.
What is the county seat of Westmoreland County?
The county seat of Westmoreland County is Greensburg.
Is there an online parcel map for Westmoreland County?
Yes. A public source publishes a parcel map of 198,609 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Westmoreland County's boundary or name changed?
Westmoreland County was created in 1773 from Bedford County. Since then the Atlas of Historical County Boundaries records 14 later changes, chiefly involving Indiana County, Armstrong County and Fayette County.
Is my lot in a flood zone?
We do not have flood maps for Westmoreland 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