Blog · October 14, 2026 · Pennsylvania
The Northumberland County Plat Book: a Pennsylvania guide
Township atlases, old editions and current owners in Northumberland County, starting near Marion Heights.
Main page: Northumberland County, PA GIS & Parcel Viewer (official map link, Northumberland County facts and neighboring maps).
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People who grew up near Marion Heights remember the Northumberland County plat book as the book that named every farm. Below is how to track one down for Northumberland County, PA, and what the online map does better.
What's inside a county plat book
Think of the Northumberland County plat book as a bound, printed version of ownership: township pages, owner names on each tract, and road maps for places like McEwensville. It's different from a recorded plat, which is the official survey drawing for a subdivision in Herndon filed with the county.
Finding the tract on the Northumberland County map
The county's own public map is the Northumberland County Basemap viewer, and it opens without an account for parcels in Herndon and the rest of the county. Click any Northumberland County parcel near Herndon to open its record: owner, parcel ID and assessed acreage are most often listed. If the official address for the Northumberland County, PA map ever changes, our directory page carries the current link for Herndon and the rest of the county.
Where Northumberland County plat books turn up
Whether a current Northumberland County edition exists varies, so ask locally in Herndon before ordering; county offices often know if one is in print. Collectors and genealogists prize old Northumberland County atlases because they display farm names and owners near Dalmatia long before online maps.
Atlas details and limits
Many atlases add rural residence listings and road maps, handy on back roads near Dalmatia. Small parcels and town lots in McEwensville are often too small to label on an atlas page, which is another reason the online map is better for them. Genealogists in Pennsylvania often pair an old Northumberland County atlas with deed records to follow a farm through the generations.
Editions, deeds and printouts
Comparing two Northumberland County editions side by side shows when a farm near Shamokin was split or sold. Some buyers print the county parcel map at township scale to carry on back roads near Shamokin.
What drives land use around Sunbury
County Business Patterns counted 1,606 business establishments in Northumberland County for 2022, led by retail trade, other services, and health care and social assistance. Mining (except oil and gas) and warehousing and storage make up an above-average share of Northumberland County businesses, a clue to how land around Shamokin gets used.
Northumberland County at a glance
Town lots cluster around Sunbury, the county seat, and Shamokin, Herndon, Kulpmont, and Marion Heights. Smaller places such as Atlas, Dalmatia, and Dewart appear on the county map as little clusters of lots. Census Bureau estimates put Northumberland County at about 90,120 residents in 2023 on about 458 square miles of land. The Northumberland County map mixes subdivision lots near Sunbury with farm and wooded tracts farther out.
Tracts that cross the Northumberland County line
Near the edge of the county, check the next map over: Columbia County, Dauphin County, Juniata County, Lycoming County, and Montour County all border it. Our Pennsylvania page links each map neighboring Northumberland County.
Deeds and plats behind the Northumberland County map
The parcel layer for Northumberland County points back to recorded deeds and plats, kept by the county's recording office (its title varies by state). A deed book and page or instrument number on the county record is the fastest way to request the document for a lot in Herndon.
Current owners without a printed book
For current ownership, the free Northumberland County Basemap viewer beats any printed book: owners update as deeds are processed, and you can click any piece of ground near Herndon. Pair the county map with a road atlas for the back roads near McEwensville.
Northumberland County plat book questions
Can I use a plat book to locate lot lines near Marion Heights?
It shows rough ownership blocks; for lines near Marion Heights, use recorded plats and surveys.
Where can I locate old plat books for Northumberland County, Pennsylvania?
Some libraries and historical societies keep older Northumberland County atlases; ask what's available near Kulpmont.
Is a plat book the same as a recorded plat for a lot in Marion Heights?
No; a lot in Marion Heights answers to its recorded plat, and the county atlas is only a guide.
Is the Northumberland County, Pennsylvania online map better than a plat book?
For current owners near Kulpmont, yes; the Northumberland County Basemap viewer updates as deeds are processed.
Can I buy a new plat book for Northumberland County, Pennsylvania?
It depends on if a publisher has a county edition in print; local offices in Marion Heights most often know.
Open the official Northumberland County, PA parcel map Northumberland 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.