Find the last 4 digits (ZIP+4) for an address in 03857

ZIP 03857, Newmarket, NH is filled in. Just type the street address.

Addresses are checked through our secure proxy. Bot checks use Cloudflare Turnstile. Each device can run 5 live checks per day; repeats of the same address are free.

ZIP Code 03857 – Newmarket, NH

Newmarket, New Hampshire · Rockingham County · Eastern time

ZIP code03857
CityNewmarket
StateNew Hampshire
CountyRockingham County
Area code603
Population9,463
Time zoneEastern · local time
ZIP typeStandard (has a Census ZCTA area)
Land area12.59 sq mi
Center (lat, long)43.0709, -70.9469

Map

Nearby ZIP codes

03856 Newfields · 2.5 mi03824 Durham · 3.5 mi03885 Stratham · 4.5 mi03861 Lee · 4.5 mi03840 Greenland · 5.5 mi03843 Hampton · 5.6 mi03833 Exeter · 6.6 mi03801 Portsmouth · 7.1 mi

About ZIP 03857

ZIP code 03857 is assigned to Newmarket, New Hampshire. It lies in Rockingham County. Its Census area covers about 12.59 square miles of land. The closest neighboring ZIP is 03856 (Newfields), about 2.5 miles away.

Every address in 03857 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources