Blog · October 14, 2026 · Pennsylvania
Union County Flood Zone Map, Pennsylvania: a practical guide
Flood zones are set by FEMA, and checking one near Susquehanna River takes a few minutes.
Main page: Union County, PA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Before you buy or build near Linntown, look at the Union County flood zone map: FEMA's zone label affects insurance, building rules and resale. What this Union County guide covers: the free FEMA tools, what each zone label means, lender insurance rules and what a LOMA is.
The Union County flood zone map: start here
If you'd rather pan and zoom, use the National Flood Hazard Layer viewer, which draws the zones over aerial imagery, which applies near Shikellamy State Park as much as anywhere. A tract near Laurelton without an address can still be found: zoom in from US Route 15 and click the spot.
Pulling up a parcel
Your first stop is the PASDA Pennsylvania Tax Parcels viewer; it maps every tax parcel from Lewisburg to Shikellamy State Park. If you only know roughly where the land is, pan along US Route 15 until the lines appear, then click inside the one you want, and that holds around Allenwood too. For property near New Columbia, save the parcel ID before closing the panel; every clerk in the county asks for it first.
Low spots and local drainage
Creeks and ditches near New Columbia aren't always studied in detail, so look for water marks and debris lines. Marshy spots near Susquehanna River can limit building too; the National Wetlands Inventory mapper shows mapped wetlands.
Union County in a few facts
Lewisburg holds the county offices, where most land records are kept. Smaller places on the map include Hartleton, Mifflinburg, New Berlin, and Allenwood. Around 42,042 people live in Union County (Census estimate, 2023) across roughly 316 square miles. Union County dates to 1813, which matters when you trace an old farm's title. Features like Susquehanna River and Sand Bridge State Park help you orient on the aerial around Vicksburg.
Reading the legal description
Older tracts around New Berlin commonly use metes-and-bounds descriptions, a series of courses and distances from a starting point. Subdivision lots in Vicksburg usually use lot and block from a recorded plat instead, which is simpler to follow. Copy the legal description from the record for the parcel near Susquehanna River before you request a deed or survey.
Questions to ask before you buy
Out toward New Columbia, request whether the home has flooded before closing; getting a quote early avoids surprises.
Next door to Union County
Union County touches Centre County, Clinton County, Lycoming County, Mifflin County, and Northumberland County, and each of those keeps its own parcel map. Acreage along the edge near Laurelton can be split in two county records, so check the adjacent map too. For a parcel near Laurelton, the Platbookmapper state page links every neighboring county map for Pennsylvania.
Decoding the flood zone labels
Around Shikellamy State Park, any A or V zone mark the Special Flood Hazard Area, land with a 1-percent chance of flooding in any year. For a parcel near Sand Bridge State Park, shaded Zone X marks moderate flood hazard, between the 1% and 0.2% annual chance floods; plain X, or C on older maps, is minimal risk.
What the map can't tell you
For a tract near Sand Bridge State Park, the acreage figure is an estimate; only a licensed surveyor sets the real corners on the ground. For land near Hartleton, records update in batches, so a deed recorded last month can take weeks to appear.
Parcel lines plus flood zones
FEMA doesn't draw property lines, so check the PASDA Pennsylvania Tax Parcels viewer too to confirm you have the right parcel near Vicksburg.
Lenders and permits
For a structure inside an A or V zone and a federally regulated lender is involved, mandatory purchase rules apply in communities in the NFIP, which applies near Sand Bridge State Park as much as anywhere. New construction in a floodplain near Sand Bridge State Park can trigger elevation rules; call the permitting office before you plan.
Offices that can help
For assessment questions about property around New Columbia go to the county assessment office, since that office keeps the assessment data. Zoning, permits and septic questions near Linntown go to planning, building or health offices, town or county, depending on location.
Questions about the Union County flood zone map
Do I need to worry about flooding in Zone X around Lewisburg?
In most cases, Zone X near Allenwood means moderate (shaded) or minimal (unshaded) mapped risk; many owners near Shikellamy State Park buy coverage anyway.
Is flood insurance mandatory near Allenwood?
It depends, but for a building near Linntown in an A or V zone with a federally backed or regulated mortgage, it's generally required; elsewhere it's optional.
What is the difference between Zone A and AE near Lewisburg?
Good question; AE is a Special Flood Hazard Area with a published base flood elevation, so builders near Hartleton design to that elevation.
Can I see flood zones on the PASDA Pennsylvania Tax Parcels viewer near Shikellamy State Park?
For acreage around Vicksburg, some county viewers include a FEMA flood layer, but FEMA's own map is the official source.
What's a legal description near Hartleton?
For a parcel near New Berlin, Deeds use lot and block, metes and bounds or survey descriptions; copy it for any survey or title request.
Open the official Union County, PA parcel map See it 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.