Zip Code 01821
Billerica, Massachusetts — Middlesex County
📍 ZIP code 01821 is in Billerica, Middlesex County, Massachusetts.
ZIP code 01821 is located in Billerica, Middlesex County, Massachusetts. It is a zip code in the Eastern (EST/EDT) Time Zone with an estimated population of 30,203. The area code for ZIP code 01821 is 978.
Quick Answer
Zip code 01821 is in Billerica, Massachusetts (Middlesex County). It has a population of 30,203, median household income of $142,564, and median home value of $581,300.
Population
30,203
Income
$142,564
Home Value
$581,300
Climate
84°F / 18°F
About Zip Code 01821
Zip code 01821 is located in Billerica, Massachusetts, within Middlesex County. Home to approximately 30,203 residents, this area sits at an elevation of 194 ft and falls within the Eastern (EST/EDT) timezone. The local area code is 978.
The median household income is $142,564 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $581,300, and the cost of living index is 188 (88% above the national average of 100).
Summers average a high of 84°F while winters drop to 18°F. The area receives about 49 in of rain and 59 in of snow annually. The zip code covers 16.6 square miles of land area and 0.4 square miles of water.
Key Statistics
30,203
$142,564
$581,300
Eastern (EST/EDT)
978
194 ft
16.6 sq mi
44.6
11,666
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Compare With Nearby Zip Codes
| Metric | 01821 | 01862 | 01730 | 01803 | 01876 | 01887 |
|---|---|---|---|---|---|---|
| City | Billerica, MA | Billerica, MA | Bedford, MA | Burlington, MA | Tewksbury, MA | Wilmington, MA |
| Population | 30,203 | 11,703 | 14,478 | 26,068 | 30,962 | 23,195 |
| Median Income | $142,564 | $131,214 | $158,286 | $142,421 | $126,795 | $161,473 |
| Home Value | $581,300 | $503,600 | $878,200 | $679,400 | $546,600 | $646,200 |
| Cost of Living | 188 | 169 | 250 | 213 | 173 | 212 |
| Median Age | 44.6 | 39.6 | 44.2 | 44.9 | 46.9 | 42.1 |
Cost of Living
100 = National Average. Billerica's cost of living is 88% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
4.1x
Demographics
Zip code 01821 has a population of 30,203 people with a median age of 44.6. There are 11,666 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Billerica (01821) population trend from 2010 to 2024
↑ 30.1%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
84°F
18°F
49 in
59 in
Billerica experiences warm summers with average highs around 84°F. Winters are cold with lows averaging 18°F. With 59 in of annual snowfall, residents should be prepared for significant winter weather.
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Housing & Economy
Median Home Value
$581,300
Median Household Income
$142,564
With 11,666 housing units across 16.6 square miles, 01821 has a housing density of 703 units per square mile. The home price-to-income ratio is 4.1x.
Location & Geography
Latitude
42.5493°
Longitude
-71.2517°
Land Area
16.6 sq mi
Water Area
0.4 sq mi
Nearby Zip Codes
Zip codes closest to 01821 (Billerica, MA) with distances:
All Zip Codes in Billerica, MA
Other zip codes serving Billerica:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 01821's $142,564. A way to compare Billerica 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 01821 (Billerica, MA). 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 Billerica, Massachusetts?
Billerica, Massachusetts uses zip code 01821 along with 3 other zip codes.
What county is zip code 01821 in?
Zip code 01821 is located in Middlesex County, Massachusetts.
What is the population of zip code 01821?
The population of zip code 01821 is 30,203 with a median age of 44.6.
Is 01821 in Billerica, Massachusetts?
Yes, zip code 01821 is in Billerica, Middlesex County, Massachusetts. The area code is 978.
Frequently Asked Questions
What city is zip code 01821 in?
Zip code 01821 is in Billerica, Massachusetts. It is part of Middlesex County and uses the Eastern (EST/EDT) timezone.
What is zip code 01821?
Zip code 01821 is a U.S. postal code in Billerica, Massachusetts (Middlesex County). It has a population of 30,203 and covers 16.6 square miles.
What is the population of zip code 01821?
The population of zip code 01821 (Billerica, MA) is 30,203 with a median age of 44.6. There are approximately 11,666 housing units in this area.
What is the median income in zip code 01821?
The median household income in zip code 01821 (Billerica, MA) is $142,564 per year. The cost of living index is 188 (100 = national average).
What is the average home price in zip code 01821?
The median home value in zip code 01821 (Billerica, MA) is $581,300. The cost of living index is 188 compared to the national average of 100.
What county is zip code 01821 in?
Zip code 01821 is located in Middlesex County, Massachusetts. The primary city is Billerica.
What is the area code for zip code 01821?
Zip code 01821 in Billerica, MA uses area code 978. It is located in the Eastern (EST/EDT) timezone.
Is zip code 01821 a good place to live?
Zip code 01821 (Billerica, MA) has a cost of living index of 188 (100 = national average), a median household income of $142,564, and median home values of $581,300. The median age is 44.6. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 01821?
The cost of living index for zip code 01821 (Billerica, MA) is 188, where 100 represents the national average. This area is above the national average. Median home value: $581,300.
What schools serve zip code 01821?
Zip code 01821 in Billerica, Massachusetts is served by the local school district of Middlesex 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.