ZIP Code 01821
standardSource:
Billerica · Middlesex County · Massachusetts
- Population
- 30,310
- Median income
- $149,042
- Median home value
- $615,100
- Bachelor's or higher
- 40.2%
- Land area
- 42.9 sq mi
706/sq mi
▲ 95% vs US
higher than 96% of US ZIPs
▲ 121% vs US
higher than 91% of US ZIPs
Median age 44.3
New York
ZIP code 01821 in Billerica, Massachusetts has a population of 30,310. The median household income is $149,042, which is 95% above the national average. Median home value is $615,100, 121% above the US average. 40.2% of residents hold a bachelor's degree or higher.
ZIP code 01821 is classified by USPS as a standard delivery area and covers roughly 42.9 square miles in Billerica, Middlesex County, Massachusetts. The area is home to 30,310 residents, producing a population density of 706 people per square mile, and falls within the New York time zone. These USPS and Census boundary values drive every downstream statistic on this page, including the benchmarks that compare 01821 against Massachusetts and the nation.
On the economic side, the median household income for ZIP 01821 sits at $149,042 (29% above the Massachusetts average), while per-capita income is $61,572. The poverty rate stands at 5.3% and the unemployment rate at 3.0%. On housing, the median home value is $615,100 (3% above the state average) with median rent at $2,346 per month, and 82.2% of occupied units are owner-occupied, a direct signal of whether 01821 behaves more like a homeowner neighborhood or a renter-heavy ZIP.
Education and household profile round out the picture: 40.2% of adults hold a bachelor's degree or higher, the median age is 44.3, and the average commute is 26 minutes. We also surface 10 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Middlesex County, so you can benchmark 01821 against its immediate geography rather than a national average alone. Every figure is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates, HUD Fair Market Rents, and FHFA Home Price Index data, no estimates, no proprietary scoring. Verify with HUD →
Top industries in ZIP 01821
Top 5 sectors by establishment count
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 + HUD FMR + FHFA HPI ACS demographics, ZBP business establishments, HUD Fair Market Rents, 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; HUD FMR + 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
$61,572
Per Capita Income
5.3%
Poverty Rate
3.0%
Unemployment Rate
25.9 min
Mean Commute Time
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?
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
$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 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
Related Areas
Frequently Asked Questions
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How have home values changed in ZIP code 01821? ▼
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What percentage of residents own vs. rent in ZIP 01821? ▼
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ZIP Code Research Guides
Official Data Resources for Billerica, MA
Verify and explore additional data for this area using these official government sources.
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023). Business data: Source: Census ZIP Code Business Patterns (ZBP) 2023. Home value trends: Source: FHFA House Price Index (HPI), Five-Digit ZIP Codes.
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Read our methodology , how this data is sourced, computed, and verified.