Blog · October 8, 2026 · Pennsylvania
Union County, Pennsylvania: Parcel Map Guide
The free official parcel map for Union County, how to search it, and what the parcel data does and doesn't tell you about owners, acreage and property lines.
Main page: Union County, PA GIS & Parcel Viewer (official map link, Union County facts and neighboring maps).
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Parcel lines, owner names and acreage for every tract from New Berlin to Mifflinburg are a few clicks away on the Union County parcel map, and it costs nothing to use.
Next: the Union County viewer link, a quick look at New Berlin and the surrounding land, and how Pennsylvania records back up the map.
Getting into the PASDA Pennsylvania Tax Parcels viewer
Union County doesn't run its own public parcel site. The free option is the statewide PASDA Pennsylvania Tax Parcels viewer, which includes the county's parcels. Zoom until the lot lines show up around Hartleton, then click; the pop-up gives the parcel ID, owner and acreage. The same link lives on our Union County county page, along with links for the surrounding area.
The lay of the land in Union County
Hartleton, Mifflinburg, and New Berlin fill out the town list, and Lewisburg is where the county seat sits. Crossroads communities such as Allenwood, Laurelton, and Linntown have their own small clusters of lots. Union County was created in 1813. Census Bureau estimates show 42,042 residents in 2023 and around 316 square miles of land in the county. Expect suburban-style lots near New Berlin and plenty of rural ground once the subdivisions thin out. Waterfront and bottomland parcels near the Susquehanna River deserve a second look at the flood layer. On the parcel layer, Sand Bridge State Park and Shikellamy State Park show up as public ground, and the private tracts along their edges are worth checking line by line.
Who's clicking on Union County parcels
The same map serves very different jobs around New Berlin. House hunters looking at Hartleton use the parcel record as a free check on the listing: lot size, legal description and last recorded sale. For a new build outside Hartleton, the parcel record supplies the lot size and legal description a site plan needs. Anyone hunting for a buildable lot near New Berlin can spot unbuilt parcels on the aerial layer and look up who owns them. For a hunter with permission on one farm near Hartleton, the parcel map shows exactly where that permission stops.
Vacant land and acreage on the Union County parcel map
Try this the next time you're looking for land near New Berlin:
- Start on the outskirts of New Berlin, where empty lots are easy to spot between the houses on the aerial layer.
- Click each empty tract near Allenwood and note the owner, acreage and mailing address.
- Assessed values lag the market, but comparing tracts near Allenwood still shows which ones the county rates higher.
- Trace the frontage on any tract near Allenwood; without it, access depends on a recorded easement.
- For a tract near Lewisburg, confirm zoning, septic suitability and flood status before you make an offer.
To double-check acreage on a parcel near Allenwood, see how to find the acreage of a property.
Property lines in Union County, Pennsylvania
Parcel boundaries on the Union County viewer are drawn to keep tax accounts straight, so small offsets from the true line are expected. Rural tracts near Hartleton follow metes-and-bounds calls, so their shapes on the map track creeks, roads and old fences. For rural ground near Allenwood, a recorded survey or a new one is the only reliable source for the true line.
Behind the map: land records in Union County
The map near Mifflinburg is only as good as the deeds behind it, and those are kept in the county's recording office. The office title varies by state (register of deeds, recorder, county clerk or clerk of court), so check the Union County government website for the right one. When the chain of title matters for land near Mifflinburg, ask for the full deed history or hire a title company in Pennsylvania.
Work and land use in Union County
Of the 967 establishments the Census Bureau counted in Union County for 2022, the biggest groups were health care and social assistance, retail trade, and other services. The sectors that stand out against the national mix are agriculture and forestry support services, wood product manufacturing, and machinery manufacturing. For a buyer eyeing woods outside Hartleton, that means asking whether the timber has been sold or harvested recently. Keep that in mind when you compare parcels in Union County: who works here shapes what land sells.
Nearby parcel maps
Looking at land between Mifflinburg and the Centre County line? Remember that Centre County, Clinton County, Lycoming County, Mifflin County, and Northumberland County each keep separate parcel records. Neighboring maps for Union County are a click away on our Pennsylvania page.
Quick answers
Where can I get a Union County plat book?
Whether a current printed edition exists for Union County varies; the free online map covering New Berlin and the rest of the county is the dependable option.
How do I look up a property owner in Union County, PA?
Search by address if the lot near New Berlin has one; otherwise click the tract on the map to see the owner of record.
What's the best way to locate a boundary in Union County?
The PASDA Pennsylvania Tax Parcels viewer gets you to the parcel; the recorded plat or deed gives the dimensions; a licensed surveyor marks the corners.
The Union County viewer is blank. What should I do?
Reload in a desktop browser; if the PASDA Pennsylvania Tax Parcels viewer still won't open, our Union County page has the current link.
Open the official Union County, PA parcel map Union County in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey, especially for fences, setbacks, or boundary disputes.