Pennsylvania · FIPS 42097 · County seat: Sunbury
Northumberland County, PA GIS & Parcel Viewer
Parcel lookups for Northumberland County start at Northumberland County Basemap viewer. This page gives you that official link, notes on how the viewer works, and links to the counties next door.
Open the Northumberland County parcel map ↗
Opens gis.norrycopa.net in a new tab. We link out and never embed or copy parcel data.
Map and county facts
| Official map | Northumberland County Basemap viewer |
|---|---|
| Type | County-run map |
| Website | gis.norrycopa.net |
| Access | Free, no login (checked Oct 2026) |
| County seat | Sunbury |
| Population | 90,120 (2023 Census Bureau estimate) |
| Land area | 458 sq mi |
| FIPS code | 42097 |
Who runs this map
It is a county-level map: Northumberland County or the company it hires keeps the parcel layer up to date. As of our October 2026 test, anyone could open it without signing in or paying.
How to use the Northumberland County viewer
- Open the official link in a new tab.
- Accept any disclaimer, then look for a search box that takes street addresses, owners or parcel IDs.
- Zoom in and click a parcel to see its details.
- Use the map's layer controls to add aerials or other layers if they're offered.
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 Northumberland County's population at 90,120 in 2023, spread over about 458 square miles of land, or roughly 197 people per square mile. That makes it number 32 out of 67 Pennsylvania counties by population. The county seat is Sunbury.
Neighboring counties
If the property sits near a county line, the parcel may belong to a neighbor. These counties border Northumberland County:
- Columbia County
- Dauphin County
- Juniata County
- Lycoming County
- Montour County
- Perry County
- Schuylkill County
- Snyder County
- Union County
Maps vs. surveys
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.