Blog · October 14, 2026 · Pennsylvania
Using the Whitehall Plat Map
A recorded plat shows how land near Bethel Park was divided into lots.
Main page: Allegheny County, PA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
Platbookmapper is an Amazon Associate. If you buy through an Amazon link on this page, we earn a commission. The link is a product, not the county map.
When a deed near Castle Shannon says lot and block, you'll need the Whitehall plat map to make sense of it. What this Whitehall guide covers: where plats are filed, how a plat differs from a parcel map, and the details that matter to buyers.
Getting started with the Whitehall plat map
For a lot in Whitehall, the deed usually cites the plat; bring that to the recorder's office or its online index.
Opening the official parcel viewer
Your first stop is the Allegheny County ArcGIS parcel map; it includes each tax parcel in the county, Pleasant Hills included. Out toward Brentwood, type a street address, an owner's name or a parcel number, and the viewer zooms to the match. For property near Castle Shannon, a pop-up or side panel normally shows the owner of record, acreage on the tax roll, a parcel ID and in many cases the last transfer.
Metes and bounds instead
Rural land near Dormont that was never subdivided may have no plat at all; look for a recorded survey for land near Bethel Park.
Sections, lots and bearings
Older tracts around Bethel Park are often described by metes and bounds, which trace the boundary call by call. Town lots near Bethel Park are typically described by lot and block, which is simpler to follow. Copy the legal description from the record for the parcel near Castle Shannon for any title or survey request.
Whitehall and the county around it
Whitehall is part of Allegheny County, Pennsylvania, so its parcels are on the county's map. Closer to Pleasant Hills, city or town hall handles things like zoning, permits and utilities within town limits, but the county runs assessment and recording. Lots just outside the city limits toward Baldwin often falls under county rules, not municipal ones.
Recorded plat or GIS layer
When the two disagree for a lot near Baldwin, the recorded plat and a survey control.
Limits of the parcel data
Tax maps are drawn for assessment, not measured on the ground, so a fence near Brentwood can sit several feet off the line on screen. For a tract near Castle Shannon, records update in batches, so a deed recorded last month can take weeks to appear.
Who handles what
If the acreage or value on a parcel near Castle Shannon looks off go to the county assessment office, which maintains the tax roll. Questions about what you can build around Pleasant Hills go to planning, building or health offices, town or county, depending on location.
Next door to Allegheny County
Allegheny County borders Armstrong County, Beaver County, Butler County, Washington County, and Westmoreland County, and each of those keeps its own parcel map. Acreage along the edge near Castle Shannon may show up in two county records, so check the adjacent map as well. For land near Pleasant Hills, our state page links every bordering county map for Pennsylvania.
Places you'll see on the map
Pittsburgh serves as the county seat, which is where the courthouse records live. You'll also find Brentwood, Castle Shannon, Pleasant Hills, and Baldwin, each with its own cluster of lots. Around 1,224,825 people live in Allegheny County (Census estimate, 2023) spread over roughly 730 square miles. Allegheny County dates to 1788, and some chains of title near Dormont are long. Features like Allegheny River and Monongahela River are easy to spot when you zoom out from Bethel Park.
On site with the map
The parcel map usually runs in a mobile browser, handy when you're parked on a road near Baldwin, so load it before you lose signal. A saved image of the lot near Castle Shannon and its lines is a good backup.
Lots, blocks and easements
Utility or drainage strips on a lot in Whitehall can block a shed or pool; check the plat notes and any covenants.
Backing up the map with records
The map is an index, not the title: deeds, subdivision plats and easements for land near Castle Shannon sit with the Recorder of Deeds. Long-held tracts near Bethel Park can sit on several deeds, and a title company can sort it out on a real sale.
Replats and vacations
An amended plat may change lots around Brentwood, so check for later filings; street vacations near Dormont show up in the records too.
Getting a copy
For acreage around Baldwin, many recorder offices offer an online index, while others require a visit or a request; small fees are common.
Questions about the Whitehall plat map
What do the dashed lines on a plat mean in Whitehall?
For a home near Pleasant Hills, dashed lines often mark easements or building lines; read the plat notes.
What does lot 7, block 3 mean near Bethel Park?
If the land is near Dormont, lot and block refer to a numbered lot within a block on a recorded subdivision plat.
Are old plats online around Baldwin?
In and around Dormont, it varies; some offices have scanned older plats and some haven't, including older subdivisions.
Is the Whitehall plat map the same as the county GIS?
For a tract near Dormont, a recorded plat is based on a survey, but the GIS map is not.
How do I save a parcel from the viewer for land near Bethel Park?
Most viewers have a print or export tool, and it's worth keeping the parcel ID visible for land near Pleasant Hills.
Open the official Allegheny 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.