Blog · October 14, 2026 · Pennsylvania
Plum Plat Map, Pennsylvania: plats and lots
Lots in Plum trace back to recorded plats filed with the county.
Main page: Allegheny County, PA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Buying a lot in a subdivision near Springdale? Start with the Plum plat map, because the recorded plat shows how the land was divided. In this Plum guide: where plats are filed, how a plat differs from a parcel map, and what to look for on the sheet.
Who keeps the Plum plat map
For a lot in Plum, the deed or parcel record often names the subdivision and plat reference; use it to request a copy.
The viewer Allegheny County publishes
Parcels around Cheswick appear on the Allegheny County ArcGIS parcel map, which opens without registering. If you're looking near Verona, enter a street address, an owner's name or a parcel number, and the viewer zooms to the match. If you're looking near Monroeville, write down the parcel ID before closing the panel; every records desk in the county uses it to find the file.
Replats and vacations
An amended plat may change lots around Oakmont, search the index for replats of the same subdivision; vacated streets or alleys also get recorded.
A word on accuracy
The acreage figure is an assessed number; just a licensed surveyor establishes the real boundary for a parcel near Cheswick. For a home near Oakmont, records update in batches, so a deed recorded last month might lag behind.
Who handles what
Questions about value or the owner field for land near Blawnox are handled by the county assessment office, since that office keeps the assessment data. Questions about what you can build around Oakmont need the planning or permitting office, town or county, depending on location.
The paper trail behind a parcel
For anything that matters, get the recorded deed through the Recorder of Deeds; the parcel map near Oakmont only summarizes it. If you're looking near Cheswick, have ready the book and page from the tax record to skip a name search.
Land on the county line
Allegheny County meets Armstrong County, Beaver County, Butler County, Washington County, and Westmoreland County, all with their own assessor records. A tract near the line by Oakmont can be split in two county records, so open the neighboring map too. The Platbookmapper state page lists each neighboring county map across Pennsylvania.
Plum, PA: the basics
Plum is part of Allegheny County, Pennsylvania, and the county assessor maps its lots. Local government in Plum handles matters such as zoning, permits and utilities for lots inside the boundary, but the county runs assessment and recording. Lots just outside the city limits near Monroeville generally falls under county rules instead.
Allegheny County in a few facts
Pittsburgh is the county seat, home to the main records offices. You'll also find Springdale, Cheswick, Oakmont, and Verona, each with its own cluster of lots. Around 1,224,825 people live in Allegheny County (Census estimate, 2023) across some 730 square miles. Allegheny County was organized in 1788, and some chains of title near Cheswick are long. Features like Allegheny River and Monongahela River are easy to spot when you zoom out from Springdale.
Two different maps
The tax map on the Allegheny County ArcGIS parcel map is a summary, while the recorded plat is the legal document.
Land outside a subdivision
Acreage around Cheswick outside a subdivision is often described by metes and bounds or survey description; the deed and any recorded survey describe it instead.
On site with the map
Most viewers work in a phone browser, useful out on a road near Blawnox, though signal can drop in rural spots. A saved image of the lot near Blawnox and its lines keeps working without signal.
Lots, blocks and easements
Recorded easements around Springdale stay with the land when it sells; read the notes on the sheet.
Requesting the plat
Out toward Blawnox, many recorder offices offer an online index, otherwise call or visit with the reference; copy fees are usually small.
Sections, lots and bearings
Tracts outside towns near Cheswick commonly use metes-and-bounds descriptions, listing bearings, distances and landmarks. Town lots near Blawnox refer to a recorded plat, making them easier to find. Write down the legal description for the tract near Blawnox before you request a deed or survey.
Questions about the Plum plat map
Is a plat map a survey around Monroeville?
On ground around Blawnox, GIS parcels are tax drawings, and the recorded plat is the legal document; trust the plat when they differ.
What is a lot and block description near Springdale?
With a lot near Blawnox, lot and block refer to a numbered lot within a block on a recorded subdivision plat.
How do I get a copy of a plat in Plum?
Good question; the Recorder of Deeds keeps recorded plats; use the plat reference from the deed or parcel record.
What do the dashed lines on a plat mean around Cheswick?
For property near Oakmont, dashed lines often mark easements or building lines; read the plat notes.
Where do I find the parcel number for land near Oakmont?
It's the number the county assessment office uses to track a tract near Verona; you'll see it in the viewer and on tax statements.
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.