02421 ZIP Code — Lexington, MA

Middlesex County, Massachusetts

ZIP code 02421 is located in Lexington, Massachusetts, within Middlesex County. It covers approximately 9.57 square miles and serves a population of 17,865 residents. This is a po box ZIP code in the Eastern (ET) timezone, served by area code 781.

About ZIP code 02421

The housing stock consists of a mix of housing types. Most homes were built in the pre-1940, giving the area an established character. Median home value is $1,086,500. Owner-occupancy is high at 78%, well above the national average.

The gap between median ($200,294) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 5% is below the national average. 32% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with professional and management as the leading industry. The average commute of 32 minutes is near the national average. Remote work is prevalent — 29% of workers work from home.

Educational attainment is high — 83% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 02421 reflects a community defined by a highly educated population, high homeownership, a high rate of remote workers, and a significant Social Security-dependent population.

17,865

population

9.57

sq mi land

PO Box

ZIP type

Eastern (ET)

timezone

02421 ZIP code map

Cities in ZIP code 02421

Below are the cities the US Postal Service accepts for ZIP code 02421. Using any city not on this list may result in mail delivery delays.

City	Status
Lexington	Acceptable

Demographics updated 07/2026

Population
Total population	17,865
Population density	1,867 / sq mi
State FIPS	25
County FIPS	017

Geography
Land area	9.57 sq mi
Water area	0.16 sq mi
Latitude	42.4430
Longitude	-71.2349
Timezone	Eastern (ET)
Area code	781

Total population by age

Gender

Race & ethnicity

Economics updated 07/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	15.5%	23.8%	31.3%
$50k – $100k	12.5%	23.1%	25.9%
$100k – $200k	27.1%	32.1%	28.5%
Over $200k	45.0%	20.9%	14.3%

Demographics & statistics

17,865

Population

1,867

People per sq mi

47.8

Median age

$200,294

Median household income

$100,873

Per capita income

$1,086,500

Median home value

$2,968

Median monthly rent

78.4%

Home ownership

5.2%

Poverty rate

3.4%

Unemployment

5,491

Housing units

83.0%

Bachelor's or higher

Age distribution

Male Female

230

Under 5

246

519

5–9

555

850

10–14

909

710

15–19

759

179

20–24

191

308

25–34

330

920

35–44

983

1,813

45–54

1,940

699

55–59

747

467

60–64

500

981

65–74

1,049

643

75–84

688

314

85+

335

← Male

Female →

Age summary

Group	Count	%
Under 18	4,494	25.2%
18 and over	13,371	74.8%
65 and over	4,010	22.4%
Median age	47.8 years

Race & ethnicity

White 56%

Asian 32.7%

Two or more races 5.7%

Hispanic or Latino 2.8%

Other race 1.5%

Black or African American 1.3%

Group	Count	%
White	10,289	56%
Asian	6,006	32.7%
Two or more races	1,047	5.7%
Hispanic or Latino	519	2.8%
Other race	281	1.5%
Black or African American	242	1.3%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	15.5%	23.8%	31.3%
$50k – $100k	12.5%	23.1%	25.9%
$100k – $200k	27.1%	32.1%	28.5%
Over $200k	45.0%	20.9%	14.3%

Under $10k 4.6%

$10k–$15k 1.4%

$15k–$25k 3.3%

$25k–$35k 1.7%

$35k–$50k 2.1%

$50k–$75k 5.4%

$75k–$100k 6.9%

$100k–$150k 11.9%

$150k–$200k 12.7%

$200k+ 50.0%

Range	% of households
Under $10k	4.6%
$10k–$15k	1.4%
$15k–$25k	3.3%
$25k–$35k	1.7%
$35k–$50k	2.1%
$50k–$75k	5.4%
$75k–$100k	6.9%
$100k–$150k	11.9%
$150k–$200k	12.7%
$200k+	50.0%
Median income	$200,294

Housing

Home values

Under $50k 0.5%

$50k–$100k 0.2%

$100k–$150k 0.6%

$150k–$200k 0.3%

$200k–$300k 1.0%

$300k–$500k 5.2%

$500k–$1M 33.3%

$1M+ 58.9%

Housing overview

Metric	Value
Median home value	$1,086,500
Median rent / month	$2,968
Owner occupied	78.4%
Renter occupied	21.6%
Vacant	2.4%
Single-family detached	69.4%
Large apartment buildings	10.2%
Mobile homes	0.0%
Median rooms	7.3
Avg household size (owned)	2.74

Year built

Era	%
2020 or later	0.6%
2010–2019	6.8%
2000–2009	10.6%
1990–1999	6.2%
1980–1989	10.7%
1970–1979	8.6%
1960–1969	12.1%
1950–1959	17.2%
1940–1949	5.5%
1939 or earlier	21.6%

Bedrooms

Size	% of units
No bedroom (studio)	1.0%
1 bedroom	9.6%
2 bedrooms	15.5%
3 bedrooms	28.2%
4 bedrooms	28.1%
5+ bedrooms	17.6%

Vehicles per household

Vehicles	% of households
No vehicle	6.4%
1 vehicle	27.1%
2 vehicles	52.4%
3 or more	14.1%

Heating fuel

Fuel type	%
Utility gas	52.3%
Electricity	10.8%
Propane / LP gas	3.4%
Fuel oil	32.9%
Wood	0.1%

Households & families

Household type	Count	%
Married-couple family	4,628	68.1%
Cohabiting couple	158	2.3%
Male householder, no spouse	658	9.7%
Female householder, no spouse	1,352	19.9%
Households with children under 18	2,778	40.9%
Households with seniors (65+)	2,674	39.3%
Average household size	2.60

Marital status

Status	Male	Female
Never married	18.6%	21.1%
Married	73.4%	63.3%
Separated	1.0%	1.1%
Widowed	2.7%	8.2%
Divorced	4.3%	6.3%

Education

Less than 9th grade 0.9%

Some HS, no diploma 1.5%

HS graduate 6.5%

Some college, no degree 4.2%

Associate's degree 3.9%

Bachelor's degree 25.4%

Graduate / professional 57.7%

Metric	%
HS diploma or higher	97.6%
Bachelor's or higher	83.0%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	270	5.5%
Kindergarten	145	3.0%
Elementary school	2,338	47.9%
High school	1,515	31.1%
College / grad school	611	12.5%

Employment

Industry of employment

Professional & management 27.3%

Education & healthcare 23.6%

Manufacturing 18.0%

Finance & real estate 9.4%

Arts, food & hospitality 5.9%

Retail trade 5.3%

Information 3.3%

Other services 2.1%

Public administration 1.9%

Wholesale trade 1.7%

Construction 0.7%

Transportation & utilities 0.7%

Agriculture & mining 0.1%

Occupation

Category	%
Management, business & arts	78.8%
Service	6.3%
Sales & office	11.0%
Natural resources & construction	0.7%
Production & transportation	3.2%

Employment type

Type	%
Private sector	85.0%
Government	7.5%
Self-employed	7.3%
Unpaid family workers	0.2%

Commute

Method	%
Drive alone	57.0%
Carpool	4.5%
Public transit	5.4%
Walk	1.8%
Work from home	29.3%
Other means	2.0%
Avg commute (minutes)	32.1

Poverty

All people 5.2%

Under 18 years 4.1%

18 and over 5.6%

Married-couple families 2.0%

Female-led households 29.7%

Income support

Source	% of households
Social Security	32.2%
Retirement income	23.0%
Supplemental Security	1.6%
Cash public assistance	2.4%
Food stamps / SNAP	3.9%

Health indicators

Condition	%
Obesity	17.8%
High blood pressure	28.0%
High cholesterol	32.3%
Diabetes	7.5%
Heart disease	5.0%
Stroke	2.1%
Asthma	8.5%
Arthritis	21.8%
Kidney disease	2.5%
Pulmonary disease	3.4%
Cancer	8.4%

Behavior / access	%
Smoking	5.8%
Binge drinking	13.3%
No physical activity	12.8%
Less than 7 hrs sleep	25.1%
Depression	14.3%
Fair or poor health	6.4%
Poor mental health	9.2%
Poor physical health	5.8%
No health insurance	3.2%
Visited doctor (checkup)	79.4%
Visited dentist	82.3%
Cholesterol screening	95.5%
Teeth loss	5.0%

Veterans & disability

Veterans	Count	%
Civilian veterans	424	3.2%

Disability	%
Any disability	8.7%
Under 18	3.8%
18–64 years	4.0%
65 and over	25.6%

Health insurance coverage

Type	%
Private insurance	89.8%
Public insurance	23.8%
No insurance	0.8%
Uninsured under 19	0.6%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	17,389	97.3%
Spanish	1,558	9.0%
Other Indo-European	68	0.4%
Asian & Pacific Islander	323	1.9%
Other languages	1,130	6.5%

Place of birth & citizenship

Origin	Count	%
Native born (US)	11,641	65.2%
Born in same state	11,292	63.2%
Born in different state	6,157	34.5%
Foreign born	349	2.0%
Naturalized citizen	6,224	34.8%
Not a US citizen	3,872	62.2%

Ancestry

Ancestry	Count	%
Italian	1,696	9.5%
French	1,594	8.9%
Arab	608	3.4%
German	267	1.5%
Polish	252	1.4%

Ancestry	Count	%
English	204	1.1%
Norwegian	148	0.8%
Irish	144	0.8%
Dutch	69	0.4%

Technology access

Metric	% of households
Computer access	38.0%
Internet access	97.2%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 02421

What city is ZIP code 02421 in?

ZIP code 02421 is primarily assigned to Lexington, Massachusetts.

What county is ZIP code 02421 in?

ZIP code 02421 falls within Middlesex County, Massachusetts.

How educated is the population of ZIP code 02421?

83% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

What is the median household income in ZIP code 02421?

The median household income in ZIP code 02421 is $200,294, above the national median of ~$75,000.

What is the typical home value in ZIP code 02421?

The median home value in ZIP code 02421 is $1,086,500.

What is the population of ZIP code 02421?

ZIP code 02421 has an estimated population of 17,865 residents, with a density of 1,867 people per square mile.

What timezone is ZIP code 02421 in?

ZIP code 02421 observes the EST timezone.