List of New Hampshire counties:
- Belknap County: formed in 1840 from parts of Merrimack County and Strafford County. County seat: Laconia.
- Carroll County: formed in 1840 from part of Strafford County. County seat: Ossipee.
- Cheshire County: one of five original counties created in New Hampshire in 1769. County seat: Keene.
- Coos County: formed in 1803 from part of Grafton County. County seat: Lancaster.
- Grafton County: one of five original counties created in New Hampshire in 1769. County seat: Haverhill.
- Hillsborough County: one of five original counties created in New Hampshire in 1769. County seats: Nashua and Manchester.
- Merrimack County: formed in 1823 from parts of Hillsborough County and Rockingham County. County seat: Concord.
- Rockingham County: one of five original counties created in New Hampshire in 1769. County seat: Brentwood. (Exeter was the county seat until 1997.)
- Strafford County: one of five original counties created in New Hampshire in 1769. County seat: Dover.
- Sullivan County: formed in 1827 from part of Cheshire County. County seat: Newport.
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