Chelmsford is a town in Middlesex County, Massachusetts, home to about 36,446 people across 22 square miles. Its ZIP codes are 01824 and 01863.
Homes sold for a median of $372 per square foot across 2 ZIP codes in the three months ending August 2026, and all of them were seller’s markets.
Each card is that ZIP code’s whole market, including any part outside Chelmsford. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Chelmsford’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Boston Logan International Airport (BOS)24 miles away |
|---|---|
| Closer regional airport | Laurence G Hanscom Field (BED)10 miles away |
| Nearest city of 250,000+ | Boston, MA26 miles away |
| Nearest city of 1 million+ | New York, NY189 miles away |
Straight-line distances from the center of Chelmsford; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Chelmsford had 36,392 residents in the 2020 census, up 7% since 2000.
It’s the 47th largest of 351 towns in Massachusetts by population.
Middlesex County grew from 565,696 residents in 1900 to 1,632,002 in 2020.
Middlesex County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 85°F in summer, and winter lows average 16°F. About 48.6 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Lowell, MA weather station (3 miles away).
963,417 jobs at 44,624 businesses in Middlesex County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
781 doctors and other health care providers list an office in Chelmsford’s ZIP codes.
Nearest hospitals
Providers with an office here
| Primary care doctors | 82 |
|---|---|
| Specialist doctors | 112 |
| Dentists | 65 |
| Nurse practitioners and physician assistants | 166 |
| Mental health providers | 241 |
| Physical and occupational therapists | 92 |
| Optometrists | 14 |
| Chiropractors | 9 |
| Pharmacies | 8 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (28 nearby)
Grocery stores (7 nearby)
Pharmacies (3 nearby)
Libraries (2 nearby)
Museums
Theaters and performance venues (1 nearby)
Counts are within about 3 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Established in 1633.
Notable people born here
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by Chelmsford. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Community Education CenterChelmsford | Pre-K | 158 | Public | 1.3 mi |
| Byam SchoolChelmsford | K–4 | 510 | Public | 2.1 mi |
| Center Elementary SchoolChelmsford | K–4 | 480 | Public | 1.0 mi |
| Charles D HarringtonNorth Chelmsford | K–4 | 468 | Public | 1.8 mi |
| South RowChelmsford | K–4 | 464 | Public | 2.1 mi |
| Col Moses Parker SchoolChelmsford | 5–6 | 778 | Public | 1.7 mi |
| McCarthy Middle SchoolChelmsford | 7–8 | 808 | Public | 1.3 mi |
| Chelmsford HighNorth Chelmsford | 9–12 | 1,402 | Public | 1.6 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Greater Visions Childrens CenterChelmsford | Pre-K–K | 9 | Nonsectarian | 1.2 mi |
| Keystone Montessori SchoolNorth Chelmsford | Pre-K–6 | 22 | Nonsectarian | 2.7 mi |
| Klub Kid TooChelmsford | Pre-K–K | 6 | Nonsectarian | 2.1 mi |
| Lighthouse School, IncNorth Chelmsford | Pre-K–12 | 213 | Nonsectarian | 3.3 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Lowell.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.