Blog · October 14, 2026 · New Hampshire
The Merrimack County Plat Book and the online parcel map
If you're looking near Allenstown, plat books show ownership by township; the parcel viewer shows it today.
Main page: Merrimack County, NH 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.
Want a copy of the Merrimack County plat book? It's a printed atlas of landownership, usually by township, and it's handy for land around Bradford. In this Merrimack County guide: how the atlas is organized, where to look for printed copies, and the free online map that stays current.
The Merrimack County plat book: start here
Out toward Andover, plat books are commercial atlases, with owner names on each tract, usually township by township.
Opening the official parcel viewer
Parcels around Henniker are published on the NHDOT Parcel Mosaic Viewer, free to use and open without a login. If the land is near Allenstown, type a street address, an owner's name or a parcel number, and the viewer zooms to the match. With a lot near Contoocook, save the parcel ID before closing the panel; every clerk in the county asks for it first.
When a parcel crosses a boundary
Merrimack County meets Belknap County, Grafton County, Hillsborough County, Rockingham County, and Strafford County, all with their own assessor records. Acreage along the edge near Bradford can be split across two assessors' files, so open the neighboring map too. If the land is near Bradford, our state page lists each bordering county map for New Hampshire.
A homemade atlas
Print parcel views near Andover township by township and keep them in a binder for the truck.
Places you'll see on the map
Concord holds the county offices, home to the main records offices. You'll also find Franklin, Allenstown, Andover, and Boscawen. About 157,103 people call Merrimack County home (Census estimate, 2023) across some 933 square miles. Merrimack County was formed in 1823, so old deeds can run back a long way. Features like John Hay National Wildlife Refuge help you orient on the aerial.
Getting answers from the right desk
Recorded documents for a parcel near Boscawen come from the county Registry of Deeds, often with an online index. Building or septic questions for a lot near Henniker need the planning or permitting office, depending on whether the land is inside town limits.
Why people still buy them
Farmers, hunters and appraisers near Contoocook use plat books for a big-picture view of who owns what.
Editions and availability
Editions come and go depending on publishers, try the county extension office, recorder's office or library near Blodgett Landing.
Where the recorded documents are
The map is an index, not the title: deeds, plats and easements for land near John Hay National Wildlife Refuge sit with the county Registry of Deeds. If the land is near Hooksett, use the document number shown in the record panel so staff can find the deed fast.
Current ownership online
Between printed editions, the NHDOT Parcel Mosaic Viewer shows current owners, including rural land around Andover.
Before you lean on the lines
Around Loudon, listed acreage is a tax-roll number; just a licensed surveyor sets the real lines on the ground. For land near Hooksett, owner names and values update on a schedule, so a deed recorded last month may not show yet.
Not the same thing
A plat book is not a recorded plat: recorded plats near Boscawen are filed with the county Registry of Deeds, while the atlas is a reference.
Sections, lots and bearings
Older tracts around Boscawen commonly use metes-and-bounds descriptions, listing bearings, distances and landmarks. Town lots near Franklin refer to a recorded plat, making them easier to find. Copy the legal description from the record for the parcel near John Hay National Wildlife Refuge when you talk to a surveyor.
On site with the map
Most viewers work in a phone browser, handy when you're parked on a road near Henniker, so load it before you lose signal. A saved image of the lot near Contoocook and its lines helps when you meet an owner or agent.
Merrimack County: common questions
Should I use the NHDOT Parcel Mosaic Viewer instead around John Hay National Wildlife Refuge?
If you're looking near Hooksett, the NHDOT Parcel Mosaic Viewer is free and updated more often.
Is there a current Merrimack County plat book?
Editions come and go.
Are old plat books online in Merrimack County?
For land near Bradford, libraries and historical societies hold older editions; call ahead.
Is a plat book legal proof for land near Franklin?
Closer to Franklin, a plat book is a privately published atlas; check the deed.
Is the parcel map a survey around Bradford?
For a home near Blodgett Landing, parcel lines are tax drawings, not surveys, so a fence may sit off the line
How accurate are plat book acreages around Allenstown?
Closer to Boscawen, the deed and a survey decide; don't rely on them for boundaries.
Open the official Merrimack County, NH 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.