03801 ZIP Code, Portsmouth, NH

03801 is a ZIP code in Portsmouth, New Hampshire in Rockingham County. It covers 24 square miles of land. The closest ZIP codes are 03840, 03870 and 03904. 23,484 people live here in 11,262 households, more than in 9 of every 10 New Hampshire ZIP codes. With about 988 people per square mile it is lightly settled, and owners and renters are mixed (53% own). Median household income is $106,756, close to the New Hampshire median of $99,031.

Quick facts

Key figures

MeasureValue
Residents23,484
Households11,262
Median household income$106,756
Income per person$72,576
Median age43.3
Homeowners53.0%
Median home value$699,900
Median rent$1,872
Bachelor's degree or higher63.9%
Average commute (minutes)22.2
Households with kids under 1815.4%
Moved in the past year17.2%
Below the poverty line6.7%
Broadband internet94.8%
Speak a non-English language at home10.3%

Household income

% of householdsValue
<$10K4.1%
$10–15K2.2%
$15–25K5.4%
$25–35K4.1%
$35–50K6.4%
$50–75K12.8%
$75–100K11.8%
$100–150K22.7%
$150–200K8.8%
$200K+21.5%

Age

% of all residentsValue
<109.5%
10–195.8%
20–245.3%
25–3417.4%
35–4413.6%
45–5411.7%
55–6414.4%
65–7411.1%
75+11.1%

Tenure

% of housing unitsValue
Owned, with mortgage31.8%
Owned outright19.7%
Rented44.5%
Vacant4.0%

Type of building

% of housing unitsValue
Detached house40.8%
Townhome9.6%
2–4 units14.5%
5–19 units18.5%
20+ units14.3%
Mobile / other2.2%

Businesses in 03801

1,956 business establishments with 40,621 employees (ZIP Codes Business Patterns 2023).

EDDM carrier routes

03801 has 27 USPS carrier routes with 12,280 residential and 2,366 business mailboxes. Open the EDDM route map.

Carrier routes in 03801

03801 has 27 USPS carrier routes (25 city (C), 2 rural (R)) with 12,280 residential and 2,366 business mailboxes. Routes range from 123 homes (C022) to 843 homes (C005); the median route has 437 homes. The Census counted 11,262 households in 03801 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per routeRoutes
1–2492
250–49915
500–7497
750–9993
1,000–1,4990
1,500+0

Best routes in 03801 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

  1. Route C041 — USPS business mailboxes 345, 331 homes
  2. Route C022 — USPS business mailboxes 260, 123 homes
  3. Route C028 — USPS business mailboxes 212, 658 homes
  4. Route C024 — USPS business mailboxes 179, 453 homes
  5. Route C021 — USPS business mailboxes 172, 471 homes

Select these 5 routes on the route map

Every carrier route in 03801

RouteTypeHomesBusinessesEst. median incomeEst. ownersEst. families with kidsEst. moved in past year
C001City342149$122,152———
C002City41132$129,739———
C004City54931$160,740———
C005City84374$132,323———
C006City57052$112,536———
C008City41619$150,000———
C009City76677$107,931———
C010City58613$89,439———
C011City50119$112,536———
C012City318107$137,924———
C013City74555$47,049———
C014City45918$106,661———
C015City34953$177,337———
C016City269136$47,049———
C017City3151$131,578———
C018City5577$94,178———
C019City43726$106,661———
C020City294118$131,578———
C021City471172$89,523———
C022City123260$177,337———
C024City453179$89,523———
C025City3304$160,740———
C028City658212$107,931———
C040City267139$137,924———
C041City331345$122,152———
R001Rural75467$72,229———
R003Rural1661$150,000———

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 03801 on the EDDM route map.

How route demographics are estimated

Mailbox counts come from USPS; demographics are estimates

The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).

How a route gets its figures: the block-group length-share method

We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.

Margins of error

Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.

Different years

USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.

Why some routes show identical figures

Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.

Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Nearby ZIP codes

Areas that include 03801

Where it ranks

Mail every home in 03801

Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 03801, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 03801 in?
03801 is a Portsmouth, NH mailing address. By land area, 66% lies inside Portsmouth; the rest is outside any Census-defined city or community.
What county is 03801 in?
03801 is in Rockingham County.
What is the population of 03801?
About 23,484 people (±277), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 22,767.
What is the median household income in 03801?
$106,756 (±$6,433), compared with $99,031 for New Hampshire as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 03801?
27 USPS carrier routes with 12,280 residential and 2,366 business mailboxes (14,754 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 03801?
The closest, measured center to center: 03840 (3.2 mi), 03870 (4.4 mi), 03904 (4.4 mi, Kittery), 03854 (4.5 mi), 03903 (5.2 mi, South Eliot) and 03824 (6.4 mi, Durham).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.