Pennsylvania · FIPS 42003 · County seat: Pittsburgh
Allegheny County, PA GIS & Parcel Viewer
Here is the direct link to the county parcel map covering Allegheny County, PA: Allegheny County GIS Viewer. Below you'll find basic facts about the county, steps for using the viewer, and nearby counties.
Open the Allegheny County parcel map ↗
Opens experience.arcgis.com in a new tab. We link out and never embed or copy parcel data.
Allegheny County at a glance
| Official map | Allegheny County GIS Viewer |
|---|---|
| Type | County-run map |
| Website | experience.arcgis.com |
| Access | Free, no login (checked Oct 2026) |
| County seat | Pittsburgh |
| Population | 1,224,825 (2023 Census Bureau estimate) |
| Land area | 730 sq mi |
| FIPS code | 42003 |
Who runs this map
This map is published by or for Allegheny County itself, so it reflects the local parcel layer rather than a third-party copy. As of our October 2026 test, anyone could open it without signing in or paying.
Searching for a parcel, step by step
- Press the button above; an ArcGIS Experience Builder app opens in a new tab. Accept any splash or disclaimer screen.
- Search by address or parcel ID, or pan to the area.
- Select a parcel to view the information the publisher makes available.
- Explore the app's panels for layers, legends or printing.
If an address search comes up empty, try the parcel number from a tax bill or deed instead, or click the lot on the map.
The county in brief
The U.S. Census Bureau estimated Allegheny County's population at 1,224,825 in 2023, spread over about 730 square miles of land, or roughly 1,678 people per square mile. By population it ranks 2nd of 67 counties in Pennsylvania. Its county seat is Pittsburgh.
Nearby parcel maps
Parcels close to the edge of Allegheny County can fall in the next county over. Neighboring counties:
- Armstrong County (state list)
- Beaver County
- Butler County
- Washington County
- Westmoreland County (state list)
Before you rely on the lines
Online parcel lines are drawn for tax and planning use. They can be off by several feet, so use a recorded plat or a licensed surveyor for fences, setbacks or a sale.