Buying Land in Merrimack County, New Hampshire

The state capital sits inside a genuinely rural county

It's easy to assume that a county containing the state capital skews urban, but Merrimack County doesn't work that way. Concord holds the State House and state government offices and has a population of roughly 44,700 -- respectable by New Hampshire standards, but far short of Manchester or Nashua's scale in neighboring Hillsborough County. Outside Concord and the smaller city of Franklin, the county's 25 towns are, for the most part, exactly the kind of rural and semi-rural New Hampshire land a buyer of raw acreage is actually looking for: Warner, Henniker, Hopkinton, Andover, Wilmot, Danbury, Hill, Sutton, Bradford, Salisbury, Webster, Boscawen, Canterbury, Chichester, Dunbarton, Loudon, and Northfield, among others, range from small-town centers to genuinely wooded and agricultural land with modest populations. A Merrimack County land search should treat Concord and Franklin as the exception, not assume the whole county trades at capital-city intensity.

Lake Sunapee's northern shore is in this county, not just Sullivan's

Lake Sunapee is most often associated with Sullivan County, since the town of Sunapee itself sits on the lake's southern and western shore in that county -- but the towns of Newbury and New London, both in Merrimack County, hold a meaningful stretch of the lake's northern and eastern shoreline. Any parcel in those towns near the lake is subject to New Hampshire's Shoreland Water Quality Protection Act (RSA 483-B) exactly the way a Sullivan County lakefront parcel would be: a 250-foot protected shoreland zone (with a stricter inner 50-foot waterfront buffer) triggering a NHDES shoreland permit for vegetation removal, excavation, fill, or most construction, layered on top of Newbury's or New London's own town zoning and shoreland-related local rules. Don't assume "Lake Sunapee land" is a Sullivan County-only conversation; check which side of the lake, and which county, a specific listing actually sits in.

Zoning and the state septic/subdivision framework, town by town

Merrimack County has no zoning authority of its own -- under RSA Chapter 674, that power belongs entirely to each city or town. Concord and Franklin each administer their own planning and zoning departments as full-service city operations; the county's 25 towns each set their own zoning ordinance, minimum lot sizes, and setbacks independently, and two adjoining towns can look very different on paper. There is no county planning office to fall back on if a specific town doesn't answer -- the municipality is always the right first call.

The same statewide rules that apply everywhere in New Hampshire apply here without exception: any lot under 5 acres needs its own NHDES Subdivision Approval confirming it can support a septic system or sewer connection (RSA 485-A:29-44), separate from and in addition to the town's own subdivision approval, and any new septic system needs a state-permitted designer and NHDES sign-off through its Subsurface Systems Bureau. For a rural Merrimack County parcel outside Concord's and Franklin's municipal sewer service areas, plan for septic and a private well as the default, not the exception.

The county also hosts three Army Corps flood-control dams

Merrimack County is home to three separate, still-active U.S. Army Corps of Engineers flood-control dam projects, all built in the decades after the catastrophic 1936 New England flood: Franklin Falls Dam on the Pemigewasset River in Franklin, Blackwater Dam on the Blackwater River in Webster, and the Merrimack County portion of the Hopkinton-Everett Lake system, spanning Henniker, Hopkinton, and Dunbarton (the system's other dam, Everett, sits just over the county line in Weare, Hillsborough County). All three are normally dry -- the river flows through unimpeded most of the year -- but their reservoir footprint fills during a major flood, and the Army Corps holds real, recorded flowage easements over privately owned land inside that footprint, restricting new construction, fill, and excavation without its approval. This is a genuinely distinct due-diligence question from an ordinary FEMA flood-zone determination; see our dedicated flood-zones page for this county for the specifics on each project and what a flowage easement actually requires of a landowner.

Checking a Merrimack County parcel before you buy

Confirm zoning, lot-size minimums, and any local site plan review directly with the specific town's (or, in Concord's and Franklin's case, city's) planning office -- there is no county-level shortcut. If the parcel is under 5 acres, verify whether it already carries a valid NHDES subdivision approval, and treat septic design as a state process handled by a permitted designer rather than a county health department. If the parcel is anywhere near Lake Sunapee's Newbury/New London shore, another named lake, or a larger river, check its distance against the Shoreland Water Quality Protection Act's 250-foot zone before assuming a build or clearing plan is unrestricted. All deeds for the county record at the Merrimack County Register of Deeds in Concord.