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 High-density area
- $149,042
- Median income Above-median income area
- $615,100
- Median home value Above-median home value
- 40.2%
- Bachelor's or higher Above-average bachelor's attainment
National ZIP placement
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.
FHFA HPI release change
What changed in the latest House Price Index year
- FHFA House Price Index values in ZIP 01821 (Billerica, MA) rose +5.9% from 2023 to 2024. The all-transactions index moved from 259.7 in 2023 to 274.9 in 2024 (2000 = 100).
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 average Massachusetts ZIP), while per-capita income is $61,572. Both reported hardship measures are comparatively low in absolute terms: poverty is 5.3% and unemployment is 3.0%. Median home value is $615,100 (3% above the average Massachusetts ZIP) and median rent is $2,346; 82.2% of occupied homes are owner-occupied.
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. The page also surfaces 10 ZIP codes within roughly 10 miles and 6 more in Middlesex County, so 01821 can be compared with both its immediate and county-level context.
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.
- Construction
Construction
166 establishments
- Professional, scientific, and technical services
Professional, scientific, and technical services
84 establishments
- Other services (except public administration)
Other services (except public administration)
67 establishments
- Administrative and support and waste management and remediation services 57
Administrative and support and waste management and remediation services
57 establishments
- Accommodation and food services 50
Accommodation and food services
50 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 + 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
Who lives in ZIP 01821?
44.3
Median Age
49.2%
Male
50.8%
Female
15.4%
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?
$149,042
Median Household Income
+29% vs state ZIP avg
$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
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?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
11,430housing units
11,430
Total Housing Units
11,312
Occupied Units
118
Vacant Units
2.65
Avg Household Size
Occupancy Type
$615,100
Median Home Value
+3% vs state ZIP avg
$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.
- 01852
Lowell (01852)
33,508 residents
- 01821
Billerica (01821)
30,310 residents
- 01876
Tewksbury (01876)
28,667 residents
- 01803
Burlington (01803)
24,487 residents
- 01887
Wilmington (01887)
22,325 residents
- 02421
Lexington (02421)
17,342 residents
- 02420
Lexington (02420)
14,052 residents
- 01730 13,221
Bedford (01730)
13,221 residents
- 01862 10,227
North Billerica (01862)
10,227 residents
What this shows Among its immediate neighbors, ZIP 01821 ranks #2 by population - useful context the national average alone can't give.
ZIP 01821 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 01741
Carlisle (01741)
$250,000 median income
- 02420
Lexington (02420)
$245,031 median income
- 02421
Lexington (02421)
$227,813 median income
- 01730
Bedford (01730)
$172,400 median income
- 01887
Wilmington (01887)
$168,152 median income
- 01821
Billerica (01821)
$149,042 median income
- 01803
Burlington (01803)
$146,436 median income
- 01862
North Billerica (01862)
$138,571 median income
- 01876
Tewksbury (01876)
$130,204 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.
| 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 |
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 01821, both outside MA so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar population
Nearest cross-state ZIPs by resident population (30,310 here; floor ≥1,000).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in Middlesex County
Related Areas
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.
Related
Take this with you
What to do with ZIP 01821's numbers, next.
- See how ZIP 01821 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Billerica, MA ranks among every U.S. ZIP code on income, education, or homeownership View national rankings
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ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.