County · code 33011
Hillsborough CountyNew Hampshire
Hillsborough County is a county in New Hampshire with its seat in Manchester and Nashua. It was created as one of the five original New Hampshire counties on April 29, 1769, and named after Wills Hill, 1st Marquess of Downshire.
- Founded1769
- County seatManchester and Nashua
- Named forWills Hill, 1st Marquess of Downshire
- Land area877 sq mi + 16 sq mi water
- Population422,937 2020 Census
- Parcels mapped134,895 checked 14 October 2026
Where it is
Hillsborough 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
Founded in 1769
An old deed may name a county that no longer exists, or a boundary that has since moved.
Hillsborough gained and lost territory throughout its early history, growing when the town of Hooksett was created from neighboring towns in 1822 and when Pelham was transferred from Rockingham County in 1824, but losing area to the creation of Merrimack County in 1823.
- 1769Hillsborough County created Hillsborough created as one of the five original New Hampshire counties. · N.H. Early Laws, vol. 3, ch. 9 [1769]/pp. 524-530
- 1778Gained territory Hillsborough gained from Cheshire when town of Fishersfield (now Newbury) was created from unincorporated lands. · N.H. Early Laws, vol. 4, ch. 17 [1778]/pp. 189-190
- 1817Gained territory Hillsborough gained from Cheshire when town of New London gained from town of Wendell (now Sunapee). · N.H. Early Laws, vol. 8, ch. 11 [1817]/pp. 607-608
- 1822Gained territory Hillsborough gained from Rockingham when town of Hooksett was created from towns of Chester, Dunbarton, and Goffstown. · N.H. Early Laws, vol. 9, ch. 42 [1822], secs. 1, 4/pp. 141-143
- 1823Lost territory Hillsborough lost to creation of Merrimack. · N.H. Early Laws, vol. 9, ch. 38 [1823], secs. 2, 12/pp. 221, 224
Show all 10 changes
- 1769Hillsborough County created Hillsborough created as one of the five original New Hampshire counties. · N.H. Early Laws, vol. 3, ch. 9 [1769]/pp. 524-530
- 1772Gained territory Hillsborough gained small area of the town of Hopkinton from Rockingham. · N.H. Early Laws, vol. 3, ch. 1 [1772]/p. 576
- 1778Gained territory Hillsborough gained from Cheshire when town of Fishersfield (now Newbury) was created from unincorporated lands. · N.H. Early Laws, vol. 4, ch. 17 [1778]/pp. 189-190
- 1787Gained territory Hillsborough gained small area from Cheshire when town of Bradford was created from Washington Gore and the towns of New Bradford and Washington. · N.H. Early Laws, vol. 5, ch. 6 [1787]/pp. 280-281
- 1791Boundary clarified Hillsborough boundaries were redefined (no change).no change· N.H. Early Laws, vol. 5, ch. 14 [1791]/pp. 766-767
- 1817Gained territory Hillsborough gained from Cheshire when town of New London gained from town of Wendell (now Sunapee). · N.H. Early Laws, vol. 8, ch. 11 [1817]/pp. 607-608
- 1822Gained territory Hillsborough gained from Rockingham when town of Hooksett was created from towns of Chester, Dunbarton, and Goffstown. · N.H. Early Laws, vol. 9, ch. 42 [1822], secs. 1, 4/pp. 141-143
- 1823Lost territory Hillsborough lost to creation of Merrimack. · N.H. Early Laws, vol. 9, ch. 38 [1823], secs. 2, 12/pp. 221, 224
- 1824Gained territory Hillsborough gained town of Pelham from Rockingham. · N.H. Early Laws, vol. 9, ch. 10 [1824]/pp. 301-302
- 1829Boundary clarified Hillsborough boundaries were redefined (no change).no change· N.H. Early Laws, vol. 9, ch. 100 [1829], sec. 1/pp. 879-882
Land and parcels
What the maps cover in Hillsborough
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 134,895 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 Hillsborough 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
Hillsborough 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
Hillsborough County's official site
We have found the county's site but not its offices yet; start there.
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.
County government
- County government
The official website of Hillsborough County.
See your own lot on these maps
Open Hillsborough 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 Hillsborough County
- When was Hillsborough County founded?
- Hillsborough County was founded in 1769, and named after Wills Hill, 1st Marquess of Downshire.
- What is the county seat of Hillsborough County?
- The county seat of Hillsborough County is Manchester and Nashua.
- Is there an online parcel map for Hillsborough County?
- Yes. New Hampshire Geographic Information System Clearinghouse (GRANIT) publishes a parcel map of 134,895 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Hillsborough County's boundary or name changed?
- Hillsborough County was created in 1769. Since then the Atlas of Historical County Boundaries records 7 later changes, chiefly involving Cheshire County, Rockingham County and Merrimack County.
- Is my lot in a flood zone?
- We do not have flood maps for Hillsborough County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby