03878 ZIP Code — Somersworth, NH
Strafford County, New Hampshire
ZIP code 03878 is located in Somersworth, New Hampshire, within Strafford County. It covers approximately 9.82 square miles and serves a population of 12,088 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 603.
About ZIP code 03878
The housing stock consists of a mix of housing types. Most homes were built in the pre-1940, giving the area an established character. Median home value is $265,200. Owner-occupancy sits near the national average at 65%.
Median household income is $75,833.
The dominant occupation class is management, business, and professional, with manufacturing as the leading industry. The average commute of 25 minutes is near the national average.
Educational attainment is near the national average, with 28% of residents holding a bachelor's degree or higher.
12,088
population
9.82
sq mi land
Standard
ZIP type
Eastern (ET)
timezone
03878 ZIP code map
Cities in ZIP code 03878
Below are the cities the US Postal Service accepts for ZIP code 03878. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Somersworth | Preferred |
Nearby ZIP codes
03869 Rollinsford (3.2 mi)
03901 Berwick (4 mi)
03822 Dover (4 mi)
03820 Dover (4.8 mi)
03839 Rochester (5.1 mi)
03867 Rochester (6.4 mi)
03868 Rochester (7 mi)
03908 South Berwick (7.2 mi)
03906 North Berwick (7.9 mi)
03825 Barrington (8.9 mi)
03903 Eliot (9.1 mi)
03824 Durham (9.4 mi)
Demographics
updated 05/2026
| Population | |
|---|---|
| Total population | 12,088 |
| Population density | 1,231 / sq mi |
| State FIPS | 33 |
| County FIPS | 017 |
| Geography | |
|---|---|
| Land area | 9.82 sq mi |
| Water area | 0.20 sq mi |
| Latitude | 43.2555 |
| Longitude | -70.8830 |
| Timezone | Eastern (ET) |
| Area code | 603 |
Total population by age
Gender
Race & ethnicity
Economics
updated 05/2026
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 34.3% | 32.7% | 31.0% |
| $50k – $100k | 41.9% | 33.3% | 31.2% |
| $100k – $200k | 22.2% | 26.7% | 28.1% |
| Over $200k | 1.6% | 7.4% | 9.7% |
Demographics & statistics
12,088
Population
1,231
People per sq mi
38.2
Median age
$75,833
Median household income
$39,712
Per capita income
$265,200
Median home value
$1,330
Median monthly rent
65.1%
Home ownership
8.7%
Poverty rate
2.8%
Unemployment
3,909
Housing units
27.8%
Bachelor's or higher
Age distribution
Male
Female
233
Under 5
226
123
5–9
119
489
10–14
475
352
15–19
342
348
20–24
337
1,236
25–34
1,200
745
35–44
723
841
45–54
817
396
55–59
384
461
60–64
447
568
65–74
552
287
75–84
279
55
85+
53
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 2,154 | 17.8% |
| 18 and over | 9,934 | 82.2% |
| 65 and over | 1,794 | 14.8% |
| Median age | 38.2 years | |
Race & ethnicity
White
81.9%
Two or more races
6.1%
Asian
4.2%
Hispanic or Latino
4.2%
Black or African American
1.9%
Other race
1.6%
| Group | Count | % |
|---|---|---|
| White | 10,328 | 81.9% |
| Two or more races | 774 | 6.1% |
| Asian | 534 | 4.2% |
| Hispanic or Latino | 525 | 4.2% |
| Black or African American | 241 | 1.9% |
| Other race | 205 | 1.6% |
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 34.3% | 32.7% | 31.0% |
| $50k – $100k | 41.9% | 33.3% | 31.2% |
| $100k – $200k | 22.2% | 26.7% | 28.1% |
| Over $200k | 1.6% | 7.4% | 9.7% |
Under $10k
2.2%
$10k–$15k
3.5%
$15k–$25k
6.5%
$25k–$35k
6.5%
$35k–$50k
9.3%
$50k–$75k
20.1%
$75k–$100k
19.6%
$100k–$150k
15.4%
$150k–$200k
11.7%
$200k+
5.3%
| Range | % of households |
|---|---|
| Under $10k | 2.2% |
| $10k–$15k | 3.5% |
| $15k–$25k | 6.5% |
| $25k–$35k | 6.5% |
| $35k–$50k | 9.3% |
| $50k–$75k | 20.1% |
| $75k–$100k | 19.6% |
| $100k–$150k | 15.4% |
| $150k–$200k | 11.7% |
| $200k+ | 5.3% |
| Median income | $75,833 |
Housing
Home values
Under $50k
8.7%
$50k–$100k
1.6%
$100k–$150k
4.9%
$150k–$200k
8.4%
$200k–$300k
40.2%
$300k–$500k
33.9%
$500k–$1M
1.8%
$1M+
0.5%
Housing overview
| Metric | Value |
|---|---|
| Median home value | $265,200 |
| Median rent / month | $1,330 |
| Owner occupied | 65.1% |
| Renter occupied | 34.9% |
| Vacant | 8.2% |
| Single-family detached | 47.6% |
| Large apartment buildings | 10.2% |
| Mobile homes | 7.1% |
| Median rooms | 5.3 |
| Avg household size (owned) | 2.46 |
Year built
| Era | % |
|---|---|
| 2020 or later | 0.0% |
| 2010–2019 | 3.4% |
| 2000–2009 | 7.0% |
| 1990–1999 | 7.1% |
| 1980–1989 | 16.6% |
| 1970–1979 | 12.2% |
| 1960–1969 | 11.2% |
| 1950–1959 | 11.7% |
| 1940–1949 | 4.9% |
| 1939 or earlier | 25.9% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 3.3% |
| 1 bedroom | 11.4% |
| 2 bedrooms | 33.3% |
| 3 bedrooms | 37.5% |
| 4 bedrooms | 11.2% |
| 5+ bedrooms | 3.3% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 7.4% |
| 1 vehicle | 31.2% |
| 2 vehicles | 43.5% |
| 3 or more | 17.9% |
Heating fuel
| Fuel type | % |
|---|---|
| Utility gas | 17.3% |
| Electricity | 9.7% |
| Propane / LP gas | 12.3% |
| Fuel oil | 53.7% |
| Wood | 1.7% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 2,283 | 43.2% |
| Cohabiting couple | 647 | 12.2% |
| Male householder, no spouse | 971 | 18.4% |
| Female householder, no spouse | 1,383 | 26.2% |
| Households with children under 18 | 1,581 | 29.9% |
| Households with seniors (65+) | 1,400 | 26.5% |
| Average household size | 2.29 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 40.8% | 29.1% |
| Married | 44.0% | 46.9% |
| Separated | 0.7% | 0.2% |
| Widowed | 1.5% | 7.7% |
| Divorced | 13.1% | 16.0% |
Education
Less than 9th grade
1.4%
Some HS, no diploma
3.9%
HS graduate
23.9%
Some college, no degree
27.5%
Associate's degree
15.5%
Bachelor's degree
19.6%
Graduate / professional
8.2%
| Metric | % |
|---|---|
| HS diploma or higher | 94.7% |
| Bachelor's or higher | 27.8% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 58 | 2.4% |
| Kindergarten | 0 | 0.0% |
| Elementary school | 1,143 | 47.8% |
| High school | 524 | 21.9% |
| College / grad school | 666 | 27.9% |
Employment
Industry of employment
Manufacturing
19.2%
Education & healthcare
18.5%
Professional & management
12.7%
Retail trade
11.9%
Arts, food & hospitality
7.9%
Public administration
7.9%
Transportation & utilities
6.5%
Finance & real estate
6.2%
Other services
3.2%
Construction
2.8%
Wholesale trade
1.5%
Information
1.4%
Agriculture & mining
0.3%
Occupation
| Category | % |
|---|---|
| Management, business & arts | 39.1% |
| Service | 12.9% |
| Sales & office | 22.2% |
| Natural resources & construction | 9.3% |
| Production & transportation | 16.4% |
Employment type
| Type | % |
|---|---|
| Private sector | 83.7% |
| Government | 12.5% |
| Self-employed | 3.5% |
| Unpaid family workers | 0.2% |
Commute
| Method | % |
|---|---|
| Drive alone | 75.9% |
| Carpool | 12.8% |
| Public transit | 2.4% |
| Walk | 0.2% |
| Work from home | 7.2% |
| Other means | 1.5% |
| Avg commute (minutes) | 25.1 |
Poverty
All people
8.7%
Under 18 years
9.6%
18 and over
8.6%
Married-couple families
5.1%
Female-led households
11.1%
Income support
| Source | % of households |
|---|---|
| Social Security | 28.7% |
| Retirement income | 28.9% |
| Supplemental Security | 8.9% |
| Cash public assistance | 3.5% |
| Food stamps / SNAP | 6.7% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 29.8% |
| High blood pressure | 28.8% |
| High cholesterol | 31.5% |
| Diabetes | 8.4% |
| Heart disease | 5.3% |
| Stroke | 2.5% |
| Asthma | 10.6% |
| Arthritis | 22.5% |
| Kidney disease | 2.4% |
| Pulmonary disease | 6.1% |
| Cancer | 6.1% |
| Behavior / access | % |
|---|---|
| Smoking | 17.8% |
| Binge drinking | 18.8% |
| No physical activity | 21.5% |
| Less than 7 hrs sleep | 31.5% |
| Depression | 25.6% |
| Fair or poor health | 12.3% |
| Poor mental health | 16.5% |
| Poor physical health | 10.1% |
| No health insurance | 11.8% |
| Visited doctor (checkup) | 71.1% |
| Visited dentist | 65.3% |
| Cholesterol screening | 89.2% |
| Teeth loss | 12.7% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 869 | 8.9% |
| Disability | % |
|---|---|
| Any disability | 13.5% |
| Under 18 | 4.9% |
| 18–64 years | 11.6% |
| 65 and over | 32.4% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 74.8% |
| Public insurance | 32.4% |
| No insurance | 5.7% |
| Uninsured under 19 | 3.3% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 11,629 | 96.2% |
| Spanish | 187 | 1.6% |
| Other Indo-European | 60 | 0.5% |
| Asian & Pacific Islander | 0 | 0.0% |
| Other languages | 60 | 0.5% |
Place of birth & citizenship
| Origin | Count | % |
|---|---|---|
| Native born (US) | 11,372 | 94.1% |
| Born in same state | 11,088 | 91.7% |
| Born in different state | 5,939 | 49.1% |
| Foreign born | 284 | 2.3% |
| Naturalized citizen | 716 | 5.9% |
| Not a US citizen | 448 | 62.6% |
Ancestry
| Ancestry | Count | % |
|---|---|---|
| Italian | 2,634 | 21.8% |
| French | 1,758 | 14.5% |
| German | 1,052 | 8.7% |
| Arab | 231 | 1.9% |
| Ancestry | Count | % |
|---|---|---|
| Polish | 108 | 0.9% |
| Norwegian | 71 | 0.6% |
| English | 69 | 0.6% |
| Irish | 10 | 0.1% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 43.7% |
| Internet access | 95.5% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 03878
What city is ZIP code 03878 in?
ZIP code 03878 is primarily assigned to Somersworth, New Hampshire.
What county is ZIP code 03878 in?
ZIP code 03878 falls within Strafford County, New Hampshire.
What is the population of ZIP code 03878?
ZIP code 03878 has an estimated population of 12,088 residents, with a density of 1,232 people per square mile.
What is the typical home value in ZIP code 03878?
The median home value in ZIP code 03878 is $265,200.
What is the median household income in ZIP code 03878?
The median household income in ZIP code 03878 is $75,833, above the national median of ~$75,000.
What timezone is ZIP code 03878 in?
ZIP code 03878 observes the EST timezone.