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ZIP Code 03857
Newmarket, NH, Rockingham County
Population
9,463
Land area
12.6sq mi
People per sq mi
751
City
Newmarket
ZIP 03857 and nearby ZIP codes
ZIP 03857 at a glance
- ZIP 03857 (Newmarket) is about 4.8 times as dense as New Hampshire as a whole.
- The median household income is $100,845, close to the New Hampshire median.
- A typical owner-occupied home is valued at $455,000 (13% above New Hampshire) and median rent is $1,671 a month.
Local data for ZIP 03857
Counts from official public data
Housing and community stats
ZIP 03857, American Community Survey 2020-2024
Median household income
$100,845
Poverty rate
4.6%
Median home value
$455,000
Prices +12.4% in a year
Median rent
$1,671/mo
Homeownership
52.9%
Bachelor's or higher
49.7%
Median age
41.2
Average commute
28.2 min
Economy and federal money
Businesses, pandemic loans and political donations
Business establishments
152
ZIP Business Patterns 2023
Employees
1,412
$73.2M annual payroll
PPP loans
$16.4M
197 loans
Campaign donations
$95.8K
57% D, 4% R, 2026 cycle
Environment and hazard risk
ZIP 03857, from FEMA, NOAA and EPA
Natural hazard risk
Relatively Moderate
Top: coastal flooding
Storm events since 1996
1,103
Countywide, mostly thunderstorm wind
Flood insurance policies
2,047
2.2% of homes, county
July high / Jan low
81° / 14°F
47.0 inches of rain a year
Health statistics
Share of adults in ZIP 03857, CDC PLACES estimates
Obesity
31.2%
U.S. 33.3% -2.1 pts
Diabetes
7.8%
U.S. 12.1% -4.3 pts
Smoking
9.4%
U.S. 12.8% -3.4 pts
Uninsured (18-64)
5.4%
U.S. 11.1% -5.7 pts
Frequently asked questions
- What city is ZIP code 03857?
- ZIP code 03857 is in Newmarket, NH (Rockingham County).
- What county is ZIP code 03857 in?
- ZIP code 03857 is mostly in Rockingham County, New Hampshire.
- How many people live in ZIP code 03857?
- About 9,463 people live in the 03857 ZIP Code Tabulation Area, based on American Community Survey 5-year estimates.
Source: U.S. Census Bureau (ZIP Code Tabulation Areas, American Community Survey) · Data as of 12/31/2023. ZIP Code Tabulation Areas closely match, but are not identical to, USPS ZIP code delivery areas.