Zip Code 02421 — Lexington, MA
02421 is a ZIP Code associated with Lexington, MA, located within Middlesex. 02421 ranks #41 out of 81 ZIP codes in Middlesex County by population (and #144 out of 539 in MA). The area supports an estimated population of 18,080 residents across Data Pending housing units, with a population density of 729.5 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (42.438000, -71.239220)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 02421 |
| Primary City | Lexington |
| State / Province | MA |
| County | Middlesex |
| Total Population | 18,080 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 729.5 people/sq mi |
| Timezone | America/New_York |
How 02421 Compares
| Metric | ZIP 02421 | Middlesex County | MA State Average |
|---|
| Population | 18,080 | 1,629,277 (Total) | 7,043,978 (Total) |
| Average ZIP Income | Data Pending | N/A | N/A |
| Population Density | 729.5 /sq mi | -- | -- |
| County Pop Rank | #41 of 81 | -- | -- |
Nearby ZIP Codes
Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →