PlainZIP

Dover, NH · standard

ZIP Code 03820

Strafford County, New Hampshire - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

30,039
418/sq mi
$94,897
Median income
$436,100
Median home value
52.0%
Bachelor's or higher

The verdict

Dover pairs an upper-quartile household income with upper-quartile home values, in a low-density, mixed-tenure area.

Top 23%
household income, US ZIPs
Top 17%
home value, US ZIPs
418
people per sq mi
53%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 03820 against every reporting US ZIP.

ZIP code 03820 is a densely settled ZIP (a standard USPS delivery area) in Dover, Strafford County, New Hampshire, with 30,039 residents across 71.9 square miles, a density of 418 people per square mile, in the New York time zone.

ZIP 03820 lands in the middle-income range, with a median household income of $94,897 (7% below the New Hampshire average), while per-capita income is $52,784. Poverty here runs at 8.3%, with unemployment measured at 4.1%. Median home value sits at $436,100 (8% above the state average), median rent at $1,607 a month, and owner-occupancy at 52.7%.

This is a highly-educated ZIP: 52.0% of adults hold a bachelor's degree or higher, the median age is 36.9, and the average commute is 23 minutes. A geography-based comparison follows: 10 ZIP codes within about 10 miles of 03820, plus 6 more within Strafford County, give a clearer read than the national average alone.

Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Top industries in ZIP 03820

Top 5 sectors by establishment count in Dover, NH

Which industries have the most business establishments in ZIP 03820.

establishments

What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.

Source U.S. Census Bureau · ZIP Code Business Patterns (ZBP) As of 2023

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 03820, Dover, NH · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

30,039

Population

71.9

Area (sq mi)

418

People / sq mi

New York

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 03820?

36.9

Median Age

49.5%

Male

50.5%

Female

6.0%

Foreign-Born

White 86.3%
African American 1.2%
Asian 4.8%
American Indian or Alaska Native 0.0%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 5.9%
Hispanic or Latino 3.5%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$94,897

Median Household Income

-7% vs state

$52,784

Per Capita Income

8.3%

Poverty Rate

4.1%

Unemployment Rate

22.8 min

Mean Commute Time

How ZIP 03820 ranks nationally

Dover, NH household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$94,897 Top 23% higher than 77% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). Below this entry. $60,000–$80,000: 9,980 US ZIPs (33%). Below this entry. $80,000–$100,000: 5,778 US ZIPs (19%). This entry sits in this band. $100,000–$120,000: 2,855 US ZIPs (9%). Above this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Above this entry. $140,000–$160,000: 686 US ZIPs (2%). Above this entry. $160,000–$180,000: 364 US ZIPs (1%). Above this entry. $180,000–$200,000: 186 US ZIPs (1%). Above this entry. $200,000–$220,000: 324 US ZIPs (1%). Above this entry. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 71.6%
Bachelor's Degree or Higher 52.0%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

15,453

Total Housing Units

15,062

Occupied Units

391

Vacant Units

2.16

Avg Household Size

Occupancy Type

Owner 52.7%
Renter 47.3%

$436,100

Median Home Value

+8% vs state

$1,607

Median Rent

1976

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How have home values changed over time?

FHFA House Price Index, annual appreciation data based on repeat sales and appraisals

+8.0%

YoY Change (2024)

301

HPI Index (2000 = 100)

+201%

Total Change Since 2000

Home values in ZIP 03820 have increased 8.0% over the past year (2024). Since 2000, this ZIP has seen +201% cumulative appreciation.

Year Annual Change HPI Index
2020 +4.4% 190
2021 +13.9% 217
2022 +15.8% 251
2023 +11.2% 279
2024 +8.0% 301

Source: Federal Housing Finance Agency (FHFA) House Price Index, All-Transactions, Five-Digit ZIP Codes (Developmental Index). Index base = 100 in year 2000. Data through 2024. ZIP codes with few transactions may show missing values.

What businesses operate in this ZIP?

Census Bureau data shows 902 business establishments in ZIP 03820, employing approximately 16,911 people with a combined annual payroll of $1,053,613,000.

902

Businesses

16,911

Employees

$1.1B

Annual Payroll

16

Industry Sectors

Industry Establishments % of Total
Health care and social assistance 146 16.2%
Accommodation and food services 113 12.5%
Retail trade 97 10.8%
Other services (except public administration) 89 9.9%
Professional, scientific, and technical services 84 9.3%
Construction 76 8.4%
Administrative and support and waste management and remediation services 59 6.5%
Finance and insurance 53 5.9%
Manufacturing 42 4.7%
Wholesale trade 36 4.0%
Real estate and rental and leasing 32 3.5%
Information 17 1.9%
Educational services 17 1.9%
Arts, entertainment, and recreation 17 1.9%
Transportation and warehousing 13 1.4%
Management of companies and enterprises 8 0.9%

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

Nearby ZIP Codes

Want a side-by-side? Compare 03820 vs 03878 →

ZIP 03820 vs its nearest neighbors, by population

Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.

residents

What this shows Among its immediate neighbors, ZIP 03820 ranks the most populous - useful context the national average alone can't give.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023

ZIP 03820 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

median income

What this shows By household income, ZIP 03820 ranks #6 of 9 neighboring ZIPs, local affluence varies block to block, not just metro to metro.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
03878 Somersworth, NH 11,824 4.4 mi
03823 Madbury, NH 1,719 2.9 mi
03869 Rollinsford, NH 2,469 3.2 mi
03824 Durham, NH 14,638 5.2 mi
03903 Eliot, ME 6,211 5.8 mi
03901 Berwick, ME 7,246 8.0 mi
03839 Rochester, NH 3,735 7.0 mi
03857 Newmarket, NH 9,006 8.9 mi
03868 Rochester, NH 5,323 9.5 mi
03908 South Berwick, ME 7,233 7.8 mi

More ZIP Codes in Strafford County

03867 standard
Rochester, NH
Pop: 20,758
03824 standard
Durham, NH
Pop: 14,638
03878 standard
Somersworth, NH
Pop: 11,824
03825 standard
Barrington, NH
Pop: 8,512
03835 standard
Farmington, NH
Pop: 6,786
03868 standard
Rochester, NH
Pop: 5,323

Related Areas

Strafford County Dover, NH New Hampshire

Frequently Asked Questions

What county is ZIP code 03820 in? ▼
ZIP code 03820 (Dover) is located in Strafford County, New Hampshire. Strafford County contains multiple ZIP codes, see the full list at /counties/strafford-nh.
What is the population of ZIP code 03820? ▼
ZIP code 03820 in Dover, NH has a population of 30,039 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 03820? ▼
The median household income in ZIP 03820 is $94,897, which is 24% above the national average of $76,288.
What is the average home value in ZIP 03820? ▼
The median home value in ZIP 03820 is $436,100, which is 57% above the national average of $278,155.
What is the demographic makeup of ZIP 03820? ▼
The largest racial group in ZIP 03820 is White at 86.3%. Hispanic or Latino residents make up 3.5% of the population.
How many businesses are in ZIP code 03820? ▼
ZIP code 03820 has 902 business establishments employing approximately 16,911 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 03820? ▼
The top industries by establishment count in ZIP 03820 are: Health care and social assistance (146), Accommodation and food services (113), Retail trade (97). There are 16 industry sectors represented in total.
How have home values changed in ZIP code 03820? ▼
According to the FHFA House Price Index, home values in ZIP 03820 increased by 8.0% in 2024. Since 2000, home values in this ZIP have appreciated by approximately 201%. This is a developmental index based on repeat sales and appraisal data from Fannie Mae and Freddie Mac.
What is the education level in ZIP code 03820? ▼
In ZIP code 03820, 71.6% of residents aged 25+ have a high school diploma or higher, and 52.0% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What is the average commute time in ZIP 03820? ▼
The mean commute time for workers in ZIP code 03820 is 22.8 minutes according to Census ACS data. The national average is roughly 26 minutes, so commuters here spend less time traveling to work than typical.
What percentage of residents own vs. rent in ZIP 03820? ▼
In ZIP code 03820, approximately 52.7% of occupied housing units are owner-occupied and 47.3% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 03820? ▼
The poverty rate in ZIP code 03820 is 8.3% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

Read our methodology to see how this data is sourced, computed, and verified.