Residential delivery area · Massachusetts
ZIP Code 01721: Ashland, MA
ZIP code 01721 uses the postal name Ashland, Massachusetts and lies entirely in Middlesex County (Census 2020 ZIP-county file). About 19,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $127,539 (Census Bureau, ACS 2020-2024). Its land lies outside any incorporated or census-designated place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Ashland · its only residential ZIP
- County
- Middlesex County
- Metro area
- Boston-Cambridge-Newton, MA-NH
- House district
- MA-2 119th Congress
- State
- Massachusetts
- Time zone
- Eastern
- Land area
- 12.3 sq mi · 1,530 people per sq mi
Where is ZIP code 01721?
01721 centers on 42.258°, -71.474° and covers 12.3 square miles of land plus 0.5 of water. It borders 6 ZIP codes: 01702, 01745, 01748, 01772, 01746, 01770.
The map draws ZIP code areas only. For the streets inside 01721, 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 01721 compare with the rest of Middlesex County?
| Measure | 01721 | In Middlesex County | In MA |
|---|---|---|---|
| People (ACS 2020-2024) | 18,873 | 39th of 83 | 134th of 539 |
| Median household income | $128k | 53rd of 78 | 139th of 406 |
| Median home value | $612k | 60th of 80 | 176th of 449 |
Its median household income is higher than in 92% of U.S. residential ZIP codes, and it is denser than 82% 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 01721?
The 2020 Census counted 18,832 people in 01721; the ACS, which samples households over 2020-2024, estimates 18,873. Between the 2010 and 2020 censuses its population grew 13.5% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 18,873
- 2020 Census count
- 18,832+13.5% since 2010 (16,593)
- Households
- 7,643
- Median age
- 42.1
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 01721?
Of the 18,873 people the ACS estimates in 01721, 18.4% are under 18 and 18.2% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (62.7%), then Asian (not Hispanic) (15.6%).
- Under 1818.4%
- 18 to 6463.3%
- 65 and older18.2%
- White, not Hispanic62.7%
- Asian, not Hispanic15.6%
- Hispanic or Latino8.7%
- Other or two or more8.0%
- Black, not Hispanic4.9%
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 01721 earn?
Median household income is $127,539 (ACS 2020-2024), the 53rd highest of the 78 ranked ZIP codes in Middlesex County. It fell from $152,306 in 2015-2019 (in 2024 dollars), a change larger than the surveys' margins of error.
- Median household income
- $127,539
- Income per person
- $70,893
- Below the poverty line
- 3.5%
- Unemployed (of the labor force)
- 5.4%
- Adults 25+ with a bachelor's degree
- 60.7%
- Adjusted gross income per tax return, 2022
- $134,1739,500 returns; wages 76% 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 01721?
FHFA's house price index for 01721, built from repeat sales and appraisals of the same homes, rose 91% from 2015 to 2025 and rose 56% from 2020 to 2025, and moved +5.9% in 2025.
- Median home value (owners' estimate)
- $611,700
- Median gross rent
- $2,452
- Homes owned by their occupants
- 75.3%
- Housing units
- 8,094
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 01721?
438 business establishments had a location in this ZIP code in 2023, 27 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction70
- Professional, scientific, and technical services66
- Other services (except public administration)50
- Retail trade46
- Accommodation and food services45
- Health care and social assistance33
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 01721?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 01702 | Framingham | 39,789 | $83k | 2.5 mi |
| 01745 | Fayville | 586 | $186k | 2.7 mi |
| 01748 | Hopkinton | 19,358 | $223k | 4.1 mi |
| 01772 | Southborough | 9,907 | $202k | 4.3 mi |
| 01746 | Holliston | 15,094 | $160k | 4.4 mi |
| 01770 | Sherborn | 4,427 | $250k+ | 5.4 mi |
| 01701 | Framingham | 32,618 | $137k | 4.6 mi (near) |
| 01760 | Natick | 36,782 | $139k | 6.6 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.