Residential delivery area · Massachusetts
ZIP Code 01581: Westborough, MA
ZIP code 01581 uses the postal name Westborough, Massachusetts and lies entirely in Worcester County (Census 2020 ZIP-county file). About 22,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $141,944 (Census Bureau, ACS 2020-2024). By Census place, 9% of its land lies in Westborough (a census-designated place); 91% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Westborough · its only residential ZIP
- County
- Worcester County
- Census places
- Westborough census-designated place
- Metro area
- Worcester, MA
- House district
- MA-2 119th Congress
- State
- Massachusetts
- Time zone
- Eastern
- Land area
- 20.6 sq mi · 1,065 people per sq mi
Where is ZIP code 01581?
01581 centers on 42.268°, -71.613° and covers 20.6 square miles of land plus 0.9 of water. It borders 6 ZIP codes: 01532, 01536, 01748, 01772, 01545, 01568.
The map draws ZIP code areas only. For the streets inside 01581, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 01581 compare with the rest of Worcester County?
| Measure | 01581 | In Worcester County | In MA |
|---|---|---|---|
| People (ACS 2020-2024) | 21,944 | 11th of 87 | 116th of 539 |
| Median household income | $142k | 11th of 67 | 92nd of 406 |
| Median home value | $685k | 4th of 77 | 127th of 449 |
Its median household income is higher than in 95% of U.S. residential ZIP codes, and it is denser than 79% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 01581?
The 2020 Census counted 21,567 people in 01581; the ACS, which samples households over 2020-2024, estimates 21,944. Between the 2010 and 2020 censuses its population grew 18.0% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 21,944
- 2020 Census count
- 21,567+18.0% since 2010 (18,272)
- Households
- 7,964
- Median age
- 38.8
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 01581?
Of the 21,944 people the ACS estimates in 01581, 25.6% are under 18 and 15.5% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (57.5%), then Asian (not Hispanic) (23.2%).
- Under 1825.6%
- 18 to 6458.8%
- 65 and older15.5%
- White, not Hispanic57.5%
- Asian, not Hispanic23.2%
- Other or two or more8.9%
- Hispanic or Latino7.4%
- Black, not Hispanic3.0%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 01581 earn?
Median household income is $141,944 (ACS 2020-2024), the 11th highest of the 67 ranked ZIP codes in Worcester County. It is not measurably different from 2015-2019 ($137,611 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $141,944
- Income per person
- $66,421
- Below the poverty line
- 6.3%
- Unemployed (of the labor force)
- 4.3%
- Adults 25+ with a bachelor's degree
- 65.2%
- Adjusted gross income per tax return, 2022
- $152,70410,180 returns; wages 75% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 01581?
FHFA's house price index for 01581, built from repeat sales and appraisals of the same homes, rose 81% from 2015 to 2025 and rose 49% from 2020 to 2025, and moved +1.4% in 2025.
- Median home value (owners' estimate)
- $685,300
- Median gross rent
- $2,106
- Homes owned by their occupants
- 61.8%
- Housing units
- 8,342
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 01581?
955 business establishments had a location in this ZIP code in 2023, 27 fewer than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services161
- Health care and social assistance131
- Accommodation and food services87
- Retail trade86
- Finance and insurance80
- Other services (except public administration)76
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 01581?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 01532 | Northborough | 15,750 | $153k | 4.2 mi |
| 01536 | North Grafton | 6,860 | $116k | 4.8 mi |
| 01748 | Hopkinton | 19,358 | $223k | 4.8 mi |
| 01772 | Southborough | 9,907 | $202k | 4.8 mi |
| 01545 | Shrewsbury | 38,876 | $139k | 5.3 mi |
| 01568 | Upton | 8,011 | $160k | 6.3 mi |
| 01519 | Grafton | 8,058 | $178k | 5.6 mi (near) |
| 01745 | Fayville | 586 | $186k | 6.1 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.