Merrimack County is the third most populous county in New Hampshire, and the forth largest by land area. It is the home of the state capital, Concord, and is named for the Merrimack River, which flows through it.

The composition of Merrimack County has changed over time. It was created and incorporated in 1823, taking parts of Hillsborough and Rockingham Counties. Later, in 1840, it ceded a small amount of territory to help form Belknap County. Since then several towns within Merrimack County have broken off from others, joined others, or have been re-named.

Today Merrimack County contains two cities and twenty-five towns:

Towns/Cities In Merrimack County
Andover Allenstown Boscawen Bow
Bradford Canterbury Chichester Concord
Danbury Dunbarton Epsom Franklin
Henniker Hill Hooksett Hopkinton
Loudon Newbury New London Northfield
Pembroke Pittsfield Salisbury Sutton
Warner Webster Wilmot

Towns/Cities Incorporated Into Merrimack County
From Rockingham County From Hillsborough County Added since 1823
Allenstown Andover

Danbury from Alexandria, Wilmot, and Hill on 7/10/1874

Bow Boscawen

Franklin from Andover, Northfield, Salisbury, and Sanbornton on 12/24/1828

Canterbury Bradford Hill on 7/1/1868
Chichester Dunbarton Webster from Boscawen on 7/4/1860
Concord Fisherfield (Newbury)  
Epsom Henniker  
Loudon Hooksett  
Northfield Hopkinton  
Pembroke New London  
Pittsfield Salisbury  


The Merrimack County Registry of Deeds is the repository for all property records having to do with Merrimack County at the time the record was filed. (Please note that the same piece of property may have been part of another county, and the records may have to be searched in two places.)

We also have plans.

Records information is available on our computer portal HERE, indexed as Grantor and Grantee. Grantors include Sellers, Debtors, Assignors and Mortgagors. Grantees include Buyers, Assignees and Mortgagees. See search instructions HERE.

Don't see what you're looking for? Original, handwritten index books are available for some older records. Please ask us for help.

A Plan index is available from 1823 to present. The indexes are numbered sequentially prior to 1823. After that, they have docket numbers. Plans are often listed under the owner’s names, development name, and subdivision or condominium name; in some cases abutters' names are listed.

Plans are available for viewing on our in-house computer system. (Ask to use our big-screen monitor!) If you wish a copy of a plan, particularly a copy larger than would fit on legal-sized paper, ask at the desk.


We are closed on the following days to observe state holidays:

  • Martin Luther King Jr. Day Monday, January 17
  • President's Day Monday, February 21
  • Memorial Day Monday, May 30
  • Independence Day Monday, July 4
  • Labor Day Monday, September 5
  • Columbus Day Monday, October 10
  • Election Day Tuesday, November 8
  • Veterans' Day Friday, November 11
  • Thanksgiving Day and Day After Thursday and Friday, November 24 and 25
  • Christmas Day After Monday, December 26