PlainZIP

Billerica, MA · standard

ZIP Code 01821

Middlesex County, Massachusetts - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

30,310
706/sq mi
$149,042
Median income
$615,100
Median home value
40.2%
Bachelor's or higher

The verdict

Billerica pairs a top-decile household income with top-decile home values, in a low-density, homeowner-dominated area.

Top 4%
household income, US ZIPs
Top 9%
home value, US ZIPs
706
people per sq mi
82%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 01821 against every reporting US ZIP.

ZIP code 01821 is a densely settled ZIP (a standard USPS delivery area) in Billerica, Middlesex County, Massachusetts, with 30,310 residents across 42.9 square miles, a density of 706 people per square mile, in the New York time zone.

ZIP 01821 skews affluent, with a median household income of $149,042 (29% above the Massachusetts average), while per-capita income is $61,572. Local economic indicators show a 5.3% poverty rate alongside 3.0% unemployment. Median home value sits at $615,100 (3% above the state average), median rent at $2,346 a month, and owner-occupancy at 82.2%.

A solid share of residents have a four-year degree: 40.2% of adults hold a bachelor's degree or higher, the median age is 44.3, and the average commute is 26 minutes. To put 01821 in local context, 10 ZIP codes within roughly 10 miles appear further down this page alongside 6 additional ZIPs in Middlesex County, for a geography-aware comparison.

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 01821

Top 5 sectors by establishment count in Billerica, MA

Which industries have the most business establishments in ZIP 01821.

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 01821, Billerica, MA · 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

30,310

Population

42.9

Area (sq mi)

706

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 01821?

44.3

Median Age

49.2%

Male

50.8%

Female

15.4%

Foreign-Born

White 79.8%
African American 2.7%
Asian 10.1%
American Indian or Alaska Native 0.0%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 6.1%
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?

$149,042

Median Household Income

+29% vs state

$61,572

Per Capita Income

5.3%

Poverty Rate

3.0%

Unemployment Rate

25.9 min

Mean Commute Time

How ZIP 01821 ranks nationally

Billerica, MA household income vs. every US ZIP code

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

$149,042 Top 4% higher than 96% 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%). Below this entry. $100,000–$120,000: 2,855 US ZIPs (9%). Below this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Below this entry. $140,000–$160,000: 686 US ZIPs (2%). This entry sits in this band. $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 66.5%
Bachelor's Degree or Higher 40.2%

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

What does housing look like?

11,430

Total Housing Units

11,312

Occupied Units

118

Vacant Units

2.65

Avg Household Size

Occupancy Type

Owner 82.2%
Renter 17.8%

$615,100

Median Home Value

+3% vs state

$2,346

Median Rent

1972

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

+5.9%

YoY Change (2024)

275

HPI Index (2000 = 100)

+175%

Total Change Since 2000

Home values in ZIP 01821 have increased 5.9% over the past year (2024). Since 2000, this ZIP has seen +175% cumulative appreciation.

Year Annual Change HPI Index
2020 +3.8% 194
2021 +10.5% 214
2022 +12.5% 241
2023 +7.7% 260
2024 +5.9% 275

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 717 business establishments in ZIP 01821, employing approximately 15,332 people with a combined annual payroll of $1,548,721,000.

717

Businesses

15,332

Employees

$1.5B

Annual Payroll

15

Industry Sectors

Industry Establishments % of Total
Construction 166 23.1%
Professional, scientific, and technical services 84 11.7%
Other services (except public administration) 67 9.3%
Administrative and support and waste management and remediation services 57 8.0%
Accommodation and food services 50 7.0%
Retail trade 49 6.8%
Wholesale trade 47 6.6%
Health care and social assistance 47 6.6%
Manufacturing 42 5.9%
Transportation and warehousing 35 4.9%
Real estate and rental and leasing 25 3.5%
Finance and insurance 19 2.6%
Information 11 1.5%
Educational services 8 1.1%
Arts, entertainment, and recreation 7 1.0%

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 01821 vs 01862 →

ZIP 01821 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 01821 ranks #2 by population - useful context the national average alone can't give.

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

ZIP 01821 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 01821 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
01862 North Billerica, MA 10,227 2.7 mi
01730 Bedford, MA 13,221 3.9 mi
01876 Tewksbury, MA 28,667 4.5 mi
01887 Wilmington, MA 22,325 4.5 mi
01803 Burlington, MA 24,487 4.2 mi
01741 Carlisle, MA 4,852 5.2 mi
01731 Hanscom Afb, MA 1,396 6.6 mi
02421 Lexington, MA 17,342 7.7 mi
01852 Lowell, MA 33,508 6.1 mi
02420 Lexington, MA 14,052 6.7 mi

More ZIP Codes in Middlesex County

02148 standard
Malden, MA
Pop: 59,503
02155 standard
Medford, MA
Pop: 57,964
02149 standard
Everett, MA
Pop: 41,550
01801 standard
Woburn, MA
Pop: 38,903
01752 standard
Marlborough, MA
Pop: 38,499
01702 standard
Framingham, MA
Pop: 37,206

Related Areas

Middlesex County Billerica, MA Massachusetts

Frequently Asked Questions

What county is ZIP code 01821 in? ▼
ZIP code 01821 (Billerica) is located in Middlesex County, Massachusetts. Middlesex County contains multiple ZIP codes, see the full list at /counties/middlesex-ma.
What is the population of ZIP code 01821? ▼
ZIP code 01821 in Billerica, MA has a population of 30,310 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 01821? ▼
The median household income in ZIP 01821 is $149,042, which is 95% above the national average of $76,288.
What is the average home value in ZIP 01821? ▼
The median home value in ZIP 01821 is $615,100, which is 121% above the national average of $278,155.
What is the demographic makeup of ZIP 01821? ▼
The largest racial group in ZIP 01821 is White at 79.8%. Hispanic or Latino residents make up 3.5% of the population.
How many businesses are in ZIP code 01821? ▼
ZIP code 01821 has 717 business establishments employing approximately 15,332 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 01821? ▼
The top industries by establishment count in ZIP 01821 are: Construction (166), Professional, scientific, and technical services (84), Other services (except public administration) (67). There are 15 industry sectors represented in total.
How have home values changed in ZIP code 01821? ▼
According to the FHFA House Price Index, home values in ZIP 01821 increased by 5.9% in 2024. Since 2000, home values in this ZIP have appreciated by approximately 175%. 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 01821? ▼
In ZIP code 01821, 66.5% of residents aged 25+ have a high school diploma or higher, and 40.2% 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 01821? ▼
The mean commute time for workers in ZIP code 01821 is 25.9 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 01821? ▼
In ZIP code 01821, approximately 82.2% of occupied housing units are owner-occupied and 17.8% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 01821? ▼
The poverty rate in ZIP code 01821 is 5.3% 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.