ZIP Code 03820
standardSource:
Dover · Strafford County · New Hampshire
- Population
- 30,039
- Median income
- $94,897
- Median home value
- $436,100
- Bachelor's or higher
- 52.0%
- Land area
- 71.9 sq mi
418/sq mi
▲ 24% vs US
higher than 77% of US ZIPs
▲ 57% vs US
higher than 83% of US ZIPs
Median age 36.9
New York
ZIP code 03820 in Dover, New Hampshire has a population of 30,039. The median household income is $94,897, which is 24% above the national average. Median home value is $436,100, 57% above the US average. 52.0% of residents hold a bachelor's degree or higher.
ZIP code 03820 is classified by USPS as a standard delivery area and covers roughly 71.9 square miles in Dover, Strafford County, New Hampshire. The area is home to 30,039 residents, producing a population density of 418 people per square mile, and falls within the New York time zone. These USPS and Census boundary values drive every downstream statistic on this page, including the benchmarks that compare 03820 against New Hampshire and the nation.
On the economic side, the median household income for ZIP 03820 sits at $94,897 (7% below the New Hampshire average), while per-capita income is $52,784. The poverty rate stands at 8.3% and the unemployment rate at 4.1%. On housing, the median home value is $436,100 (8% above the state average) with median rent at $1,607 per month, and 52.7% of occupied units are owner-occupied, a direct signal of whether 03820 behaves more like a homeowner neighborhood or a renter-heavy ZIP.
Education and household profile round out the picture: 52.0% of adults hold a bachelor's degree or higher, the median age is 36.9, and the average commute is 23 minutes. We also surface 10 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Strafford County, so you can benchmark 03820 against its immediate geography rather than a national average alone. Every figure is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates, HUD Fair Market Rents, and FHFA Home Price Index data, no estimates, no proprietary scoring. Verify with HUD →
Top industries in ZIP 03820
Top 5 sectors by establishment count
Which industries have the most business establishments in ZIP 03820.
- Health care and social assistance
Health care and social assistance
146 establishments
- Accommodation and food services
Accommodation and food services
113 establishments
- Retail trade
Retail trade
97 establishments
- Other services (except public administration)
Other services (except public administration)
89 establishments
- Professional, scientific, and technical services
Professional, scientific, and technical services
84 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, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + HUD FMR + FHFA HPI ACS demographics, ZBP business establishments, HUD Fair Market Rents, 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; HUD FMR + 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
Who lives in ZIP 03820?
36.9
Median Age
49.5%
Male
50.5%
Female
6.0%
Foreign-Born
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
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What is the education profile here?
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
$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 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
Related Areas
Frequently Asked Questions
What county is ZIP code 03820 in? ▼
What is the population of ZIP code 03820? ▼
What is the median household income in ZIP 03820? ▼
What is the average home value in ZIP 03820? ▼
What is the demographic makeup of ZIP 03820? ▼
How many businesses are in ZIP code 03820? ▼
What are the main industries in ZIP code 03820? ▼
How have home values changed in ZIP code 03820? ▼
What is the education level in ZIP code 03820? ▼
What is the average commute time in ZIP 03820? ▼
What percentage of residents own vs. rent in ZIP 03820? ▼
What is the poverty rate in ZIP code 03820? ▼
ZIP Code Research Guides
Official Data Resources for Dover, NH
Verify and explore additional data for this area using these official government sources.
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023). Business data: Source: Census ZIP Code Business Patterns (ZBP) 2023. Home value trends: Source: FHFA House Price Index (HPI), Five-Digit ZIP Codes.
PlainZIP is not affiliated with the U.S. Census Bureau or any government agency.
Read our methodology , how this data is sourced, computed, and verified.