Zip Code 03820
Dover, New Hampshire — Strafford County
📍 ZIP code 03820 is in Dover, Strafford County, New Hampshire.
ZIP code 03820 is located in Dover, Strafford County, New Hampshire. It is a zip code in the Eastern (EST/EDT) Time Zone with an estimated population of 33,150. The area code for ZIP code 03820 is 603.
Quick Answer
Zip code 03820 is in Dover, New Hampshire (Strafford County). It has a population of 33,150, median household income of $92,793, and median home value of $397,900.
Population
33,150
Income
$92,793
Home Value
$397,900
Climate
81°F / 15°F
About Zip Code 03820
Zip code 03820 is located in Dover, New Hampshire, within Strafford County. Home to approximately 33,150 residents, this area sits at an elevation of 95 ft and falls within the Eastern (EST/EDT) timezone. The local area code is 603.
The median household income is $92,793 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $397,900, and the cost of living index is 127 (27% above the national average of 100).
Summers average a high of 81°F while winters drop to 15°F. The area receives about 48 in of rain and 36 in of snow annually. The zip code covers 27.7 square miles of land area and 2.5 square miles of water.
Key Statistics
33,150
$92,793
$397,900
Eastern (EST/EDT)
603
95 ft
27.7 sq mi
37.6
15,460
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Compare With Nearby Zip Codes
| Metric | 03820 | 03869 | 03878 | 03824 | 03903 | 03839 |
|---|---|---|---|---|---|---|
| City | Dover, NH | Rollinsford, NH | Somersworth, NH | Durham, NH | Eliot, ME | Rochester, NH |
| Population | 33,150 | 2,452 | 12,145 | 15,054 | 6,978 | 4,150 |
| Median Income | $92,793 | $82,983 | $79,691 | $126,658 | $100,472 | $86,932 |
| Home Value | $397,900 | $363,200 | $295,200 | $469,900 | $465,100 | $299,800 |
| Cost of Living | 127 | 116 | 97 | 148 | 140 | 96 |
| Median Age | 37.6 | 40.1 | 38.3 | 20.7 | 49.4 | 38.8 |
Cost of Living
100 = National Average. Dover's cost of living is 27% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
4.3x
Demographics
Zip code 03820 has a population of 33,150 people with a median age of 37.6. There are 15,460 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Dover (03820) population trend from 2010 to 2024
↓ -0.5%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
81°F
15°F
48 in
36 in
Dover experiences warm summers with average highs around 81°F. Winters are cold with lows averaging 15°F. With 36 in of annual snowfall, residents should be prepared for significant winter weather.
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Housing & Economy
Median Home Value
$397,900
Median Household Income
$92,793
With 15,460 housing units across 27.7 square miles, 03820 has a housing density of 558 units per square mile. The home price-to-income ratio is 4.3x.
Location & Geography
Latitude
43.1907°
Longitude
-70.8877°
Land Area
27.7 sq mi
Water Area
2.5 sq mi
Nearby Zip Codes
Zip codes closest to 03820 (Dover, NH) with distances:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 03820's $92,793. A way to compare Dover to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 03820 (Dover, NH). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is Dover, New Hampshire?
Dover, New Hampshire uses zip code 03820.
What county is zip code 03820 in?
Zip code 03820 is located in Strafford County, New Hampshire.
What is the population of zip code 03820?
The population of zip code 03820 is 33,150 with a median age of 37.6.
Is 03820 in Dover, New Hampshire?
Yes, zip code 03820 is in Dover, Strafford County, New Hampshire. The area code is 603.
Frequently Asked Questions
What city is zip code 03820 in?
Zip code 03820 is in Dover, New Hampshire. It is part of Strafford County and uses the Eastern (EST/EDT) timezone.
What is zip code 03820?
Zip code 03820 is a U.S. postal code in Dover, New Hampshire (Strafford County). It has a population of 33,150 and covers 27.7 square miles.
What is the population of zip code 03820?
The population of zip code 03820 (Dover, NH) is 33,150 with a median age of 37.6. There are approximately 15,460 housing units in this area.
What is the median income in zip code 03820?
The median household income in zip code 03820 (Dover, NH) is $92,793 per year. The cost of living index is 127 (100 = national average).
What is the average home price in zip code 03820?
The median home value in zip code 03820 (Dover, NH) is $397,900. The cost of living index is 127 compared to the national average of 100.
What county is zip code 03820 in?
Zip code 03820 is located in Strafford County, New Hampshire. The primary city is Dover.
What is the area code for zip code 03820?
Zip code 03820 in Dover, NH uses area code 603. It is located in the Eastern (EST/EDT) timezone.
Is zip code 03820 a good place to live?
Zip code 03820 (Dover, NH) has a cost of living index of 127 (100 = national average), a median household income of $92,793, and median home values of $397,900. The median age is 37.6. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 03820?
The cost of living index for zip code 03820 (Dover, NH) is 127, where 100 represents the national average. This area is above the national average. Median home value: $397,900.
What schools serve zip code 03820?
Zip code 03820 in Dover, New Hampshire is served by the local school district of Strafford County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.