Blog · October 14, 2026 · Pennsylvania
Union County Property Lines in Pennsylvania
The free Union County parcel map, Pennsylvania legal descriptions and survey basics for land around Mifflinburg.
Main page: Union County, PA GIS & Parcel Viewer (official map link, Union County facts and neighboring maps).
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Where does a yard in Lewisburg actually end? A quick check of Union County property lines on the official viewer gives a good first answer, and a fresh survey gives the final word for land in Union County, Pennsylvania.
This page covers how the Union County parcel layer draws boundaries, what accuracy to expect, reading a deed description, and what to do when a fence near Hartleton disagrees.
Viewing Union County property lines online
Open the PASDA Pennsylvania Tax Parcels viewer, zoom to the lot near Mifflinburg, then compare the drawn line with fences, tree lines and driveways. Measuring a lot in New Berlin on screen is fine for a first look, not for setting posts.
Step one: the free Union County viewer
There's no separate Union County parcel site to hunt for; the PASDA Pennsylvania Tax Parcels viewer carries the county's parcels along with the rest of Pennsylvania. Use the search box for an address in Hartleton or a parcel number, or simply zoom in and click a tract close to Lewisburg. Our Union County, PA page keeps the official link and the maps next door to Lewisburg in one place.
Towns and land across Union County
From Lewisburg, the seat of the county, the map spreads out to Hartleton, Mifflinburg, and New Berlin. Smaller places such as Allenwood, Laurelton, and Linntown appear on the county map as little clusters of lots. Union County had an estimated 42,042 people in 2023 (Census Bureau), spread across about 316 square miles. Platted neighborhoods near Lewisburg give way to rural acreage elsewhere in the county. With a founding date of 1813, Union County has long chains of title on some rural tracts.
Why the map and the ground disagree
GIS lines in Union County are built for assessment, not construction, so they can sit several feet, sometimes much more, from the true line. For a fence, an addition near New Berlin or a neighbor dispute, a licensed land surveyor's stakes are what count.
Deeds and plats behind the Union County map
The parcel layer for Union County points back to recorded deeds and plats, kept by the county's recording office (its title varies by state). Copy the parcel identifier and legal description from the county record well before you request a deed for land near Lewisburg.
Tracts that cross the Union County line
Near the edge of the county, check the next map over: Centre County, Clinton County, Lycoming County, Mifflin County, and Northumberland County all border it. Every map bordering Union County is listed on our Pennsylvania directory.
Reading the legal description
Land near New Berlin usually relies on metes-and-bounds descriptions, sometimes tied to old markers that are hard to track down near Mifflinburg. For a platted lot in Mifflinburg, the plat referenced on the county record gives frontage, depth and easements, which a surveyor will want to see.
Walking a line in Union County
On rural land near Allenwood, old fences and tree lines often follow a past boundary, but do not assume they match the deed. Take photos of any pins or markers you track down near New Berlin and note where they sit relative to the county parcel outline.
Setbacks, fences and trees in Union County
Garages, sheds and pools near Allenwood often have setback minimums, and the measurement is from the surveyed line, not the Union County GIS line. Long-standing fences near Allenwood can raise legal questions under Pennsylvania law, which is a conversation for a real estate attorney.
Pins, plats and surveys
Survey markers on a Union County tract may be buried a few inches down, but one pin does not prove where the line runs. Check whether a fresh survey of the tract close to New Berlin was recorded; the county's recording office may already hold a plat, and an attorney can advise if it escalates.
Union County property lines questions
How much does a fresh survey cost in Union County?
Usually whoever orders it; for a sale near New Berlin, buyer and seller can negotiate it, and costs depend on the tract.
Where are the corner markers on a Union County tract?
Corners on Union County tracts are often marked with iron rods; a fresh survey plat shows where to look.
Can I see property lines on my phone in Union County?
The PASDA Pennsylvania Tax Parcels viewer usually works in a phone browser, though GPS accuracy near Allenwood adds its own error.
How can I see the lot lines for a house in New Berlin?
Open the PASDA Pennsylvania Tax Parcels viewer, track down the parcel, and turn on the aerial layer; for exact lines near New Berlin, look for a recorded survey or hire a surveyor.
Are property lines on the Union County GIS map accurate?
They're rough; Union County parcel lines can be off by several feet or more, so use a fresh survey for fences and building.
Do easements display on the Union County parcel map?
Usually not; check the recorded plat and deed for any easement on a Union County parcel.
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.