What city is 02421 in?

02421 is a Lexington, MA mailing address. By land area, 100% lies inside Lexington.

What is the population of 02421?

About 18,080 people (±916), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 18,950.

What is the median household income in 02421?

$227,813 (±$31,387), compared with $103,960 for Massachusetts as a whole. Half the households in the ZIP code earn more and half earn less.

How many carrier routes and mailboxes are in 02421?

21 USPS carrier routes with 7,066 residential and 516 business mailboxes (7,590 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 02421?

The closest, measured center to center: 02420 (1.8 mi, Lexington), 02451 (2.6 mi, Waltham), 01731 (2.9 mi, Hanscom AFB), 02452 (3.1 mi, Waltham), 01773 (3.7 mi, Waltham) and 02476 (3.7 mi, Arlington).

02421 ZIP Code, Lexington, MA

02421 is a ZIP code in Lexington, Massachusetts in Middlesex County. It covers 9.6 square miles of land. The closest ZIP codes are 02420, 02451 and 01731. 18,080 people live here in 6,824 households. At about 1,889 people per square mile it has suburban density, and most homes are owner-occupied (76%). Median household income is $227,813, well above the Massachusetts median of $103,960; the median age is 48.2, older than most ZIP codes.

Quick facts

Mailing city: Lexington, MA
County: Middlesex County
Land area: 9.6 sq mi
Population: 18,080
Median household income: $227,813
Carrier routes: 21 (7,066 homes)

Key figures

Measure	Value
Residents	18,080
Households	6,824
Median household income	$227,813
Income per person	$112,662
Median age	48.2
Homeowners	75.9%
Median home value	$1,205,700
Median rent	$2,948
Bachelor's degree or higher	83.2%
Average commute (minutes)	31.4
Households with kids under 18	39.4%
Moved in the past year	10.6%
Below the poverty line	6.4%
Broadband internet	98.2%
Speak a non-English language at home	40.9%

Household income

% of households	Value
<$10K	4.5%
$10–15K	2.9%
$15–25K	2.3%
$25–35K	3.6%
$35–50K	2.3%
$50–75K	4.8%
$75–100K	4.4%
$100–150K	9.1%
$150–200K	13.4%
$200K+	52.7%

Age

% of all residents	Value
<10	9.0%
10–19	17.5%
20–24	2.6%
25–34	3.5%
35–44	10.0%
45–54	20.2%
55–64	14.3%
65–74	11.7%
75+	11.0%

Tenure

% of housing units	Value
Owned, with mortgage	44.5%
Owned outright	30.7%
Rented	23.6%
Vacant	1.1%

Type of building

% of housing units	Value
Detached house	69.2%
Townhome	8.4%
2–4 units	4.0%
5–19 units	8.5%
20+ units	9.9%
Mobile / other	0.0%

Businesses in 02421

582 business establishments with 20,781 employees (ZIP Codes Business Patterns 2023).

Professional, Scientific, and Technical Services: 175
Health Care and Social Assistance: 91
Other Services (except Public Administration): 50
Accommodation and Food Services: 39
Retail Trade: 32
Finance and Insurance: 28
Construction: 27
Administrative and Support and Waste Management and Remediation Services: 24

EDDM carrier routes

02421 has 21 USPS carrier routes with 7,066 residential and 516 business mailboxes. Open the EDDM route map.

Carrier routes in 02421

02421 has 21 USPS carrier routes (21 city (C)) with 7,066 residential and 516 business mailboxes. Routes range from 191 homes (C042) to 620 homes (C006); the median route has 321 homes. The Census counted 6,824 households in 02421 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	3
250–499	16
500–749	2
750–999	0
1,000–1,499	0
1,500+	0

Best routes in 02421 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

Route C039 — USPS business mailboxes 120, 252 homes
Route C037 — USPS business mailboxes 112, 210 homes
Route C001 — USPS business mailboxes 82, 304 homes
Route C042 — USPS business mailboxes 49, 191 homes
Route C045 — USPS business mailboxes 36, 321 homes

Select these 5 routes on the route map

Every carrier route in 02421

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C001	City	304	82	$193,618	—	—	—
C004	City	331	6	$163,839	—	—	—
C006	City	620	3	$200,001+	—	—	—
C008	City	332	0	$200,001+	—	—	—
C009	City	451	22	$155,570	—	—	—
C013	City	344	9	$200,001+	—	—	—
C017	City	250	7	$193,618	—	—	—
C018	City	565	4	$155,570	—	—	—
C021	City	282	1	$194,645	—	—	—
C025	City	321	0	$200,001+	—	—	—
C027	City	398	1	$200,001+	—	—	—
C029	City	200	0	$200,001+	—	—	—
C032	City	314	1	$200,001+	—	—	—
C035	City	346	2	$200,001+	—	—	—
C036	City	449	15	$115,216	—	—	—
C037	City	210	112	$165,863	—	—	—
C039	City	252	120	$180,213	—	—	—
C040	City	297	32	$193,618	—	—	—
C042	City	191	49	$115,216	—	—	—
C045	City	321	36	$200,001+	—	—	—
C047	City	288	14	$200,001+	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 02421 on the EDDM route map.

How route demographics are estimated

Mailbox counts come from USPS; demographics are estimates

The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).

How a route gets its figures: the block-group length-share method

We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.

Margins of error

Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.

Different years

USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.

Why some routes show identical figures

Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.

Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Nearby ZIP codes

02420 — Lexington CDP, MA (1.8 mi)
02451 — Waltham city, MA (2.6 mi)
01731 — Hanscom AFB CDP, MA (2.9 mi)
02452 — Waltham city, MA (3.1 mi)
01773 — Waltham city, MA (3.7 mi)
02476 — Arlington CDP, MA (3.7 mi)
02478 — Belmont CDP, MA (4.3 mi)
02474 — Arlington CDP, MA (4.4 mi)

Areas that include 02421

Lexington, MA ZIP codes — 3 ZIP codes
Middlesex County ZIP codes — 83 ZIP codes
Massachusetts ZIP code data

Where it ranks

Mail every home in 02421

Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 02421, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 02421 in?: 02421 is a Lexington, MA mailing address. By land area, 100% lies inside Lexington.
What county is 02421 in?: 02421 is in Middlesex County.
What is the population of 02421?: About 18,080 people (±916), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 18,950.
What is the median household income in 02421?: $227,813 (±$31,387), compared with $103,960 for Massachusetts as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 02421?: 21 USPS carrier routes with 7,066 residential and 516 business mailboxes (7,590 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 02421?: The closest, measured center to center: 02420 (1.8 mi, Lexington), 02451 (2.6 mi, Waltham), 01731 (2.9 mi, Hanscom AFB), 02452 (3.1 mi, Waltham), 01773 (3.7 mi, Waltham) and 02476 (3.7 mi, Arlington).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.