ZIP code 03857: Newmarket, NH
03857 is a ZIP code in Newmarket, New Hampshire, mainly in Rockingham County, part of the Boston-Cambridge-Newton, MA-NH metro area. About 9,463 people live here.
- Population
- 9,463
- Median household income
- $100,845
- Typical home value
- $562,700+5.1% in 12 months
- Median rent
- $1,671gross, per month
- Median age
- 41.2
- Homeowners
- 52.9%of occupied homes
Shaded: ZIP code 03857's area. Click anywhere on the map to see which ZIP code it's in.
ZIP codes within 10 milesWithin 25 miles
ZIP code 03857 details
| City | Newmarket |
|---|---|
| State | New Hampshire |
| County | Rockingham County |
| Metro area | Boston-Cambridge-Newton, MA-NH |
| Time zone | Eastern Time (UTC−5), observes daylight saving time |
| Type | Standard (delivery area) |
| Land area | 12.6 sq mi, plus 1.6 sq mi of water |
| Population density | 752 people per sq mi |
| Bachelor's degree or higher | 49.7% of adults 25+ |
| Average commute | 28.2 minutes |
| Center coordinates | 43.07091, -70.94694 |
Median rent in 03857 by bedrooms
| Size | Median gross rent |
|---|---|
| 1 bedroom | $1,408/mo |
| 2 bedrooms | $1,712/mo |
| 3 bedrooms | $2,017/mo |
Gross rent includes utilities paid by the tenant. ACS 2020–2024; sizes with too few rentals to estimate are left out.
ZIP codes near 03857
| ZIP code | City | Distance | Population |
|---|---|---|---|
| 03856 | Newfields, NH | 2.5 mi | 2,023 |
| 03824 | Durham, NH | 3.5 mi | 15,080 |
| 03885 | Stratham, NH | 4.5 mi | 7,754 |
| 03861 | Lee, NH | 4.5 mi | 4,576 |
| 03840 | Greenland, NH | 5.6 mi | 4,106 |
| 03843 | Hampton, NH | 5.6 mi | — |
| 03833 | Exeter, NH | 6.6 mi | 22,817 |
| 03801 | Portsmouth, NH | 7.1 mi | 23,484 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Buying a home in 03857?
A typical home in ZIP code 03857 is worth about $562,700 (Zillow Home Value Index). The median household here earns $100,845 a year. See what buying here would cost per month, with New Hampshire average taxes and insurance filled in.
Monthly payment for a $562,700 homeWhat can a $100,845 income afford?Rental property numbers
About ZIP code 03857
What city is ZIP code 03857?
ZIP code 03857 is in Newmarket, NH, in Rockingham County.
What county is ZIP code 03857 in?
03857 is mainly in Rockingham County, New Hampshire.
What is the population of ZIP code 03857?
About 9,463 people live in ZIP code 03857, according to the American Community Survey 2020–2024 5-year estimates.
What time zone is ZIP code 03857 in?
03857 is in Eastern Time (UTC−5). It observes daylight saving time.