ZIP codes

ZIP codes in New Hampshire by county

New Hampshire has 247 ZIP codes in its 10 counties. 9 of them cross a county line and 1 cross into a neighboring state. Grafton County has the most, 37.

By the All Map Tools Team

ZIP codes: 247; With 1% or more of their land in the state
Counties: 10; 4 with a page of their own below
Cross a county line: 9; 1% or more of their land in another county
Cross a state line: 1; 1% or more of their land in another state
County with the most: 37; Grafton County
Most populated ZIP: 03103; 37,775 people · Manchester

ZIP codes per county in New Hampshire

14–16
17–29
30–34
35–37

Open in the interactive tool

Counties and their ZIP codes

County	Population (2025)	ZIP codes	Shared
Belknap County	65,147	14	2
Carroll County	52,784	30	1
Cheshire County	78,269	25	1
Coos County	31,343	15	1
Grafton County	93,225	37	2
Hillsborough County	433,415	34	1
Merrimack County	158,078	29	4
Rockingham County	324,077	37	1
Strafford County	135,043	16	1
Sullivan County	43,961	18	3

Every ZIP code in New Hampshire, by county

A ZIP code that crosses a county line appears in each county it has 1% or more of its land in.

Belknap County (14): 03218, 03220, 03225, 03226, 03237, 03246, 03249, 03253, 03256, 03269, 03276, 03809, 03810, 03837
Carroll County (30): 03227, 03254, 03259, 03812, 03813, 03814, 03816, 03817, 03818, 03830, 03832, 03836, 03838, 03845, 03846, 03847, 03849, 03850, 03853, 03860, 03864, 03872, 03875, 03882, 03883, 03886, 03887, 03890, 03894, 03897
Cheshire County (25): 03431, 03441, 03443, 03444, 03445, 03446, 03447, 03448, 03450, 03451, 03452, 03455, 03456, 03457, 03461, 03462, 03464, 03465, 03466, 03467, 03470, 03602, 03604, 03608, 03609
Coos County (15): 03570, 03575, 03576, 03579, 03581, 03582, 03583, 03584, 03588, 03590, 03592, 03593, 03595, 03597, 03598
Grafton County (37): 03215, 03217, 03222, 03223, 03238, 03240, 03241, 03243, 03245, 03251, 03262, 03264, 03266, 03279, 03282, 03285, 03293, 03561, 03574, 03580, 03585, 03586, 03740, 03741, 03748, 03750, 03755, 03765, 03766, 03768, 03771, 03774, 03777, 03779, 03780, 03784, 03785
Hillsborough County (34): 03031, 03033, 03043, 03045, 03047, 03048, 03049, 03051, 03052, 03054, 03055, 03057, 03060, 03062, 03063, 03064, 03070, 03071, 03076, 03082, 03084, 03086, 03101, 03102, 03103, 03104, 03109, 03110, 03244, 03281, 03440, 03442, 03449, 03458
Merrimack County (29): 03046, 03106, 03216, 03220, 03221, 03224, 03229, 03230, 03231, 03233, 03234, 03235, 03242, 03243, 03255, 03257, 03258, 03260, 03263, 03268, 03273, 03275, 03276, 03278, 03287, 03301, 03303, 03304, 03307
Rockingham County (37): 03032, 03034, 03036, 03037, 03038, 03042, 03044, 03053, 03077, 03079, 03087, 03103, 03261, 03290, 03291, 03801, 03811, 03819, 03826, 03827, 03833, 03840, 03841, 03842, 03844, 03848, 03854, 03856, 03857, 03858, 03862, 03865, 03870, 03871, 03873, 03874, 03885
Strafford County (16): 03820, 03823, 03824, 03825, 03835, 03839, 03851, 03852, 03855, 03861, 03867, 03868, 03869, 03878, 03884, 03887
Sullivan County (18): 03257, 03280, 03284, 03601, 03602, 03603, 03605, 03607, 03743, 03745, 03748, 03751, 03752, 03753, 03770, 03773, 03781, 03782

Neighboring states

Tools for New Hampshire

ZIP codes by county or city Any county or city in New Hampshire on an interactive map, with CSV US county map Its counties shaded by population, income or your own data Elevation and places of New Hampshire Its capital, its cities and its highest point, with their elevation

Sources

U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.

How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.

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