ZIP code 01821: Billerica, MA
01821 is a ZIP code in Billerica, Massachusetts, mainly in Middlesex County, part of the Boston-Cambridge-Newton, MA-NH metro area. About 30,143 people live here.
- Population
- 30,143
- Median household income
- $149,042
- Typical home value
- $696,100+2.6% in 12 months
- Median rent
- $2,346gross, per month
- Median age
- 44.3
- Homeowners
- 82.2%of occupied homes
Shaded: ZIP code 01821's area. Click anywhere on the map to see which ZIP code it's in.
ZIP codes within 10 milesWithin 25 miles
ZIP code 01821 details
| City | Billerica |
|---|---|
| State | Massachusetts |
| County | Middlesex County |
| Metro area | Boston-Cambridge-Newton, MA-NH |
| Time zone | Eastern Time (UTC−5), observes daylight saving time |
| Type | Standard (delivery area) |
| Land area | 16.6 sq mi, plus 0.4 sq mi of water |
| Population density | 1,817 people per sq mi |
| Bachelor's degree or higher | 40.2% of adults 25+ |
| Average commute | 25.9 minutes |
| Center coordinates | 42.54933, -71.25172 |
Median rent in 01821 by bedrooms
| Size | Median gross rent |
|---|---|
| 1 bedroom | $2,108/mo |
| 2 bedrooms | $2,489/mo |
| 3 bedrooms | $2,411/mo |
Gross rent includes utilities paid by the tenant. ACS 2020–2024; sizes with too few rentals to estimate are left out.
ZIP codes near 01821
| ZIP code | City | Distance | Population |
|---|---|---|---|
| 01822 | Billerica, MA | 1.1 mi | — |
| 01865 | Nutting Lake, MA | 1.2 mi | — |
| 01866 | Pinehurst, MA | 1.8 mi | — |
| 01862 | North Billerica, MA | 3.0 mi | 12,129 |
| 01730 | Bedford, MA | 3.8 mi | 14,707 |
| 01803 | Burlington, MA | 4.1 mi | 26,274 |
| 01805 | Burlington, MA | 4.2 mi | — |
| 01876 | Tewksbury, MA | 4.5 mi | 31,004 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Buying a home in 01821?
A typical home in ZIP code 01821 is worth about $696,100 (Zillow Home Value Index). The median household here earns $149,042 a year. See what buying here would cost per month, with Massachusetts average taxes and insurance filled in.
Monthly payment for a $696,100 homeWhat can a $149,042 income afford?Rental property numbers
About ZIP code 01821
What city is ZIP code 01821?
ZIP code 01821 is in Billerica, MA, in Middlesex County.
What county is ZIP code 01821 in?
01821 is mainly in Middlesex County, Massachusetts.
What is the population of ZIP code 01821?
About 30,143 people live in ZIP code 01821, according to the American Community Survey 2020–2024 5-year estimates.
What time zone is ZIP code 01821 in?
01821 is in Eastern Time (UTC−5). It observes daylight saving time.
What other ZIP codes does Billerica have?
Billerica, MA also uses 01822.