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ZIP Code 03870
Portsmouth, NH, Rockingham County
Population
5,188
Land area
12.1sq mi
People per sq mi
431
City
Portsmouth
ZIP 03870 and nearby ZIP codes
ZIP 03870 at a glance
- ZIP 03870 (Portsmouth) is about 2.8 times as dense as New Hampshire as a whole.
- The median household income is $140,938, 42% above the New Hampshire median of $99,031.
- A typical owner-occupied home is valued at $990,700 (about 2.5 times the New Hampshire figure) and median rent is $1,790 a month.
Local data for ZIP 03870
Counts from official public data
Housing and community stats
ZIP 03870, American Community Survey 2020-2024
Median household income
$140,938
Poverty rate
6.9%
Median home value
$990,700
Prices -0.6% in a year
Median rent
$1,790/mo
Homeownership
85.7%
Bachelor's or higher
60.1%
Median age
54.9
Average commute
29.2 min
Economy and federal money
Businesses, pandemic loans and political donations
Business establishments
133
ZIP Business Patterns 2023
Employees
1,246
$64.9M annual payroll
PPP loans
$14.3M
235 loans
Campaign donations
$383K
33% D, 30% R, 2026 cycle
Environment and hazard risk
ZIP 03870, 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° / 16°F
50.6 inches of rain a year
Health statistics
Share of adults in ZIP 03870, CDC PLACES estimates
Obesity
29.7%
U.S. 33.3% -3.6 pts
Diabetes
9.8%
U.S. 12.1% -2.3 pts
Smoking
7.7%
U.S. 12.8% -5.1 pts
Uninsured (18-64)
4.1%
U.S. 11.1% -7.0 pts
Frequently asked questions
- What city is ZIP code 03870?
- ZIP code 03870 is in Portsmouth, NH (Rockingham County).
- What county is ZIP code 03870 in?
- ZIP code 03870 is mostly in Rockingham County, New Hampshire.
- How many people live in ZIP code 03870?
- About 5,188 people live in the 03870 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.