County · code 33019
Sullivan CountyNew Hampshire
Sullivan County is in New Hampshire and was formed on September 4, 1827, from Cheshire County. The county seat is Newport and is named after John Sullivan.
- Founded1827
- County seatNewport
- Named forJohn Sullivan
- Land area538 sq mi + 14 sq mi water
- Population43,063 2020 Census
- Parcels mapped27,422 checked 14 October 2026
Where it is
Sullivan on the map of New Hampshire
New Hampshire has 10 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1827 from Cheshire County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Sullivan County was created from Cheshire County on September 4, 1827. In 1837, the town of Enfield was transferred to Grafton County when it gained from the town of Grantham.
- 1827Sullivan County created Sullivan created from Cheshire. · N.H. Early Laws, vol. 9, ch. 48 [1827], secs. 2, 13/pp. 649-650, 653
- 1829Boundary clarified Sullivan boundaries were redefined (no change).no change· N.H. Early Laws, vol. 9, ch. 100 [1829], sec. 1/pp. 879-882
- 1837Lost territory Sullivan lost to Grafton when town of Enfield gained from town of Grantham. · N.H. Laws 1836, ch. 290, sec. 1/pp. 257-258
Land and parcels
What the maps cover in Sullivan
Who publishes each layer, how good it is, and when we last checked.
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Parcels Good enough
Lot lines and tax-map numbers for 27,422 parcels from New Hampshire Geographic Information System Clearinghouse (GRANIT). Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 14 October 2026 -
Address points Missing
No public address points layer found for Sullivan County yet.
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Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- Official
- from the office that keeps the record
- Good enough
- a reliable statewide or national copy
- Fallback
- a guide only; check the official record
- Missing
- nothing public found yet
People and land
Sullivan by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
Who to ask before you build, dig or sell
Official county pages only. We link to them; we do not copy them, because they change.
In New Hampshire, permits, zoning and assessing are handled by each city or town, not the county, and deeds are recorded at the county's registry of deeds.
Permits
- Health department: septic and well
Lead Paint & Healthy Homes Program
- Pistol-Revolver Permit Applications
County government
- County government
The official website of Sullivan County.
See your own lot on these maps
Open Sullivan County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.
Questions
Common questions about Sullivan County
- When was Sullivan County founded?
- Sullivan County was founded in 1827, formed from Cheshire County, and named after John Sullivan.
- What is the county seat of Sullivan County?
- The county seat of Sullivan County is Newport.
- Is there an online parcel map for Sullivan County?
- Yes. New Hampshire Geographic Information System Clearinghouse (GRANIT) publishes a parcel map of 27,422 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Sullivan County's boundary or name changed?
- Sullivan County was created in 1827 from Cheshire County. Since then the Atlas of Historical County Boundaries records 1 later change, chiefly involving Grafton County.
- Who issues building permits in Sullivan County?
- The county's page on building permits: Pistol-Revolver Permit Applications. Inside a city or town, ask that city first.
- Who issues septic and well permits in Sullivan County?
- The county's page on septic systems and wells: Lead Paint & Healthy Homes Program.
- Is my lot in a flood zone?
- We do not have flood maps for Sullivan County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
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