03820 ZIP Code — Dover, NH
Strafford County, New Hampshire
ZIP code 03820 is located in Dover, New Hampshire, within Strafford County. It covers approximately 27.28 square miles and serves a population of 32,925 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 603.
About ZIP code 03820
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 $368,200. Owner-occupancy sits near the national average at 52%.
The gap between median ($90,868) and mean household income suggests income inequality — a small number of higher earners pull the average up.
The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 23 minutes is near the national average.
Educational attainment is high — 51% of residents hold a bachelor's degree or higher, well above the national average of 33%.
32,925
population
27.28
sq mi land
Standard
ZIP type
Eastern (ET)
timezone
03820 ZIP code map
Cities in ZIP code 03820
Below are the cities the US Postal Service accepts for ZIP code 03820. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Dover | Preferred |
Nearby ZIP codes
03822 Dover (1.3 mi)
03869 Rollinsford (3.5 mi)
03824 Durham (4.7 mi)
03878 Somersworth (4.8 mi)
03903 Eliot (6.3 mi)
03839 Rochester (6.6 mi)
03825 Barrington (8 mi)
03901 Berwick (8.6 mi)
03908 South Berwick (8.6 mi)
03857 Newmarket (8.7 mi)
03867 Rochester (9.3 mi)
03904 Kittery (9.5 mi)
Demographics
updated 05/2026
| Population | |
|---|---|
| Total population | 32,925 |
| Population density | 1,207 / sq mi |
| State FIPS | 33 |
| County FIPS | 017 |
| Geography | |
|---|---|
| Land area | 27.28 sq mi |
| Water area | 2.32 sq mi |
| Latitude | 43.1870 |
| Longitude | -70.8945 |
| 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 | 31.7% | 32.7% | 31.0% |
| $50k – $100k | 33.9% | 33.3% | 31.2% |
| $100k – $200k | 26.5% | 26.7% | 28.1% |
| Over $200k | 7.9% | 7.4% | 9.7% |
Demographics & statistics
32,925
Population
1,207
People per sq mi
37.2
Median age
$90,868
Median household income
$52,729
Per capita income
$368,200
Median home value
$1,436
Median monthly rent
52.0%
Home ownership
7.6%
Poverty rate
3.7%
Unemployment
8,242
Housing units
50.7%
Bachelor's or higher
Age distribution
Male
Female
868
Under 5
882
661
5–9
671
719
10–14
730
658
15–19
669
1,648
20–24
1,673
3,052
25–34
3,098
2,150
35–44
2,182
1,924
45–54
1,954
1,089
55–59
1,106
872
60–64
885
1,515
65–74
1,539
823
75–84
835
358
85+
364
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 5,609 | 17.0% |
| 18 and over | 27,316 | 83.0% |
| 65 and over | 5,434 | 16.5% |
| Median age | 37.2 years | |
Race & ethnicity
White
86.9%
Two or more races
4.3%
Asian
3.9%
Hispanic or Latino
2.5%
Black or African American
1.3%
Other race
1.2%
| Group | Count | % |
|---|---|---|
| White | 29,344 | 86.9% |
| Two or more races | 1,454 | 4.3% |
| Asian | 1,302 | 3.9% |
| Hispanic or Latino | 846 | 2.5% |
| Black or African American | 433 | 1.3% |
| Other race | 392 | 1.2% |
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 31.7% | 32.7% | 31.0% |
| $50k – $100k | 33.9% | 33.3% | 31.2% |
| $100k – $200k | 26.5% | 26.7% | 28.1% |
| Over $200k | 7.9% | 7.4% | 9.7% |
Under $10k
2.3%
$10k–$15k
3.9%
$15k–$25k
4.3%
$25k–$35k
7.2%
$35k–$50k
9.5%
$50k–$75k
14.9%
$75k–$100k
12.5%
$100k–$150k
16.6%
$150k–$200k
13.3%
$200k+
15.6%
| Range | % of households |
|---|---|
| Under $10k | 2.3% |
| $10k–$15k | 3.9% |
| $15k–$25k | 4.3% |
| $25k–$35k | 7.2% |
| $35k–$50k | 9.5% |
| $50k–$75k | 14.9% |
| $75k–$100k | 12.5% |
| $100k–$150k | 16.6% |
| $150k–$200k | 13.3% |
| $200k+ | 15.6% |
| Median income | $90,868 |
Housing
Home values
Under $50k
2.2%
$50k–$100k
2.8%
$100k–$150k
1.9%
$150k–$200k
1.3%
$200k–$300k
22.1%
$300k–$500k
46.6%
$500k–$1M
21.2%
$1M+
1.9%
Housing overview
| Metric | Value |
|---|---|
| Median home value | $368,200 |
| Median rent / month | $1,436 |
| Owner occupied | 52.0% |
| Renter occupied | 48.0% |
| Vacant | 4.2% |
| Single-family detached | 42.0% |
| Large apartment buildings | 15.0% |
| Mobile homes | 2.9% |
| Median rooms | 5.2 |
| Avg household size (owned) | 2.43 |
Year built
| Era | % |
|---|---|
| 2020 or later | 0.9% |
| 2010–2019 | 7.2% |
| 2000–2009 | 11.1% |
| 1990–1999 | 10.4% |
| 1980–1989 | 14.9% |
| 1970–1979 | 11.9% |
| 1960–1969 | 7.8% |
| 1950–1959 | 7.5% |
| 1940–1949 | 2.0% |
| 1939 or earlier | 26.2% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 3.4% |
| 1 bedroom | 15.2% |
| 2 bedrooms | 34.6% |
| 3 bedrooms | 29.1% |
| 4 bedrooms | 14.2% |
| 5+ bedrooms | 3.5% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 4.1% |
| 1 vehicle | 37.9% |
| 2 vehicles | 43.7% |
| 3 or more | 14.3% |
Heating fuel
| Fuel type | % |
|---|---|
| Utility gas | 40.5% |
| Electricity | 16.6% |
| Propane / LP gas | 9.3% |
| Fuel oil | 28.5% |
| Wood | 1.3% |
| Solar | 0.4% |
| No fuel used | 1.9% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 6,559 | 44.9% |
| Cohabiting couple | 1,397 | 9.6% |
| Male householder, no spouse | 3,038 | 20.8% |
| Female householder, no spouse | 3,630 | 24.8% |
| Households with children under 18 | 3,475 | 23.8% |
| Households with seniors (65+) | 3,838 | 26.2% |
| Average household size | 2.18 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 38.4% | 35.3% |
| Married | 49.1% | 46.2% |
| Separated | 0.8% | 1.9% |
| Widowed | 1.7% | 5.6% |
| Divorced | 10.0% | 11.0% |
Education
Less than 9th grade
1.4%
Some HS, no diploma
2.2%
HS graduate
20.0%
Some college, no degree
15.0%
Associate's degree
10.7%
Bachelor's degree
33.1%
Graduate / professional
17.6%
| Metric | % |
|---|---|
| HS diploma or higher | 96.4% |
| Bachelor's or higher | 50.7% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 455 | 7.3% |
| Kindergarten | 292 | 4.7% |
| Elementary school | 2,137 | 34.3% |
| High school | 1,293 | 20.8% |
| College / grad school | 2,047 | 32.9% |
Employment
Industry of employment
Education & healthcare
24.6%
Professional & management
13.8%
Manufacturing
12.6%
Arts, food & hospitality
11.4%
Finance & real estate
10.1%
Retail trade
9.1%
Other services
4.7%
Public administration
4.6%
Construction
3.1%
Transportation & utilities
2.5%
Information
1.8%
Wholesale trade
1.5%
Agriculture & mining
0.1%
Occupation
| Category | % |
|---|---|
| Management, business & arts | 50.5% |
| Service | 16.0% |
| Sales & office | 19.9% |
| Natural resources & construction | 5.2% |
| Production & transportation | 8.4% |
Employment type
| Type | % |
|---|---|
| Private sector | 80.3% |
| Government | 14.2% |
| Self-employed | 5.3% |
| Unpaid family workers | 0.2% |
Commute
| Method | % |
|---|---|
| Drive alone | 75.8% |
| Carpool | 4.6% |
| Public transit | 2.2% |
| Walk | 1.8% |
| Work from home | 14.8% |
| Other means | 0.9% |
| Avg commute (minutes) | 23.2 |
Poverty
All people
7.6%
Under 18 years
5.5%
18 and over
8.0%
Married-couple families
2.3%
Female-led households
11.0%
Income support
| Source | % of households |
|---|---|
| Social Security | 28.0% |
| Retirement income | 22.9% |
| Supplemental Security | 4.4% |
| Cash public assistance | 2.6% |
| Food stamps / SNAP | 5.8% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 27.7% |
| High blood pressure | 26.9% |
| High cholesterol | 29.3% |
| Diabetes | 7.5% |
| Heart disease | 5.0% |
| Stroke | 2.2% |
| Asthma | 10.3% |
| Arthritis | 20.9% |
| Kidney disease | 2.3% |
| Pulmonary disease | 5.1% |
| Cancer | 6.1% |
| Behavior / access | % |
|---|---|
| Smoking | 14.2% |
| Binge drinking | 19.0% |
| No physical activity | 18.5% |
| Less than 7 hrs sleep | 29.5% |
| Depression | 24.6% |
| Fair or poor health | 10.5% |
| Poor mental health | 15.4% |
| Poor physical health | 8.8% |
| No health insurance | 10.0% |
| Visited doctor (checkup) | 71.3% |
| Visited dentist | 69.0% |
| Cholesterol screening | 89.4% |
| Teeth loss | 10.7% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 1,576 | 5.8% |
| Disability | % |
|---|---|
| Any disability | 11.8% |
| Under 18 | 2.9% |
| 18–64 years | 9.8% |
| 65 and over | 30.2% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 78.9% |
| Public insurance | 29.0% |
| No insurance | 6.0% |
| Uninsured under 19 | 2.3% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 31,175 | 94.7% |
| Spanish | 685 | 2.2% |
| Other Indo-European | 187 | 0.6% |
| Asian & Pacific Islander | 274 | 0.9% |
| Other languages | 217 | 0.7% |
Place of birth & citizenship
| Origin | Count | % |
|---|---|---|
| Native born (US) | 31,010 | 94.2% |
| Born in same state | 30,343 | 92.2% |
| Born in different state | 13,997 | 42.5% |
| Foreign born | 667 | 2.0% |
| Naturalized citizen | 1,915 | 5.8% |
| Not a US citizen | 1,075 | 56.1% |
Ancestry
| Ancestry | Count | % |
|---|---|---|
| Italian | 8,026 | 24.4% |
| French | 6,963 | 21.1% |
| German | 2,384 | 7.2% |
| Arab | 891 | 2.7% |
| English | 270 | 0.8% |
| Ancestry | Count | % |
|---|---|---|
| Polish | 261 | 0.8% |
| Norwegian | 226 | 0.7% |
| Dutch | 130 | 0.4% |
| Irish | 76 | 0.2% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 44.4% |
| Internet access | 95.7% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 03820
What city is ZIP code 03820 in?
ZIP code 03820 is primarily assigned to Dover, New Hampshire.
What county is ZIP code 03820 in?
ZIP code 03820 falls within Strafford County, New Hampshire.
How educated is the population of ZIP code 03820?
51% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.
What is the typical home value in ZIP code 03820?
The median home value in ZIP code 03820 is $368,200.
What is the population of ZIP code 03820?
ZIP code 03820 has an estimated population of 32,925 residents, with a density of 1,207 people per square mile.
What is the median household income in ZIP code 03820?
The median household income in ZIP code 03820 is $90,868, above the national median of ~$75,000.
What timezone is ZIP code 03820 in?
ZIP code 03820 observes the EST timezone.