02451 ZIP Code — Waltham, MA

Middlesex County, Massachusetts

ZIP code 02451 is located in Waltham, Massachusetts, within Middlesex County. It covers approximately 5.32 square miles and serves a population of 18,379 residents. This is a po box ZIP code in the Eastern (ET) timezone, served by area code 781/617/339/978.

About ZIP code 02451

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 $677,700. Owner-occupancy sits near the national average at 60%.

The gap between median ($117,932) and mean household income suggests income inequality — a small number of higher earners pull the average up.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 27 minutes is near the national average.

Educational attainment is high — 55% of residents hold a bachelor's degree or higher, well above the national average of 33%.

18,379

population

5.32

sq mi land

PO Box

ZIP type

Eastern (ET)

timezone

02451 ZIP code map

Cities in ZIP code 02451

Below are the cities the US Postal Service accepts for ZIP code 02451. Using any city not on this list may result in mail delivery delays.

City	Status
Waltham	Acceptable

Demographics updated 06/2026

Population
Total population	18,379
Population density	3,455 / sq mi
State FIPS	25
County FIPS	017

Geography
Land area	5.32 sq mi
Water area	0.71 sq mi
Latitude	42.3973
Longitude	-71.2594
Timezone	Eastern (ET)
Area code	781/617/339/978

Total population by age

Gender

Race & ethnicity

Economics updated 06/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	24.6%	23.8%	31.3%
$50k – $100k	22.6%	23.1%	25.9%
$100k – $200k	33.1%	32.1%	28.5%
Over $200k	19.7%	20.9%	14.3%

Demographics & statistics

18,379

Population

3,455

People per sq mi

39.5

Median age

$117,932

Median household income

$64,930

Per capita income

$677,700

Median home value

$2,497

Median monthly rent

59.5%

Home ownership

8.1%

Poverty rate

2.8%

Unemployment

4,968

Housing units

54.9%

Bachelor's or higher

Age distribution

Male Female

384

Under 5

361

365

5–9

344

361

10–14

340

290

15–19

273

983

20–24

925

1,707

25–34

1,607

1,182

35–44

1,113

1,128

45–54

1,063

786

55–59

740

527

60–64

496

963

65–74

907

603

75–84

568

187

85+

176

← Male

Female →

Age summary

Group	Count	%
Under 18	2,388	13.0%
18 and over	15,991	87.0%
65 and over	3,404	18.5%
Median age	39.5 years

Race & ethnicity

White 57.8%

Asian 13.6%

Hispanic or Latino 9.9%

Two or more races 6.9%

Black or African American 5.7%

Other race 5.6%

American Indian / Alaska Native 0.4%

Group	Count	%
White	11,799	57.8%
Asian	2,775	13.6%
Hispanic or Latino	2,025	9.9%
Two or more races	1,411	6.9%
Black or African American	1,156	5.7%
Other race	1,149	5.6%
American Indian / Alaska Native	89	0.4%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	24.6%	23.8%	31.3%
$50k – $100k	22.6%	23.1%	25.9%
$100k – $200k	33.1%	32.1%	28.5%
Over $200k	19.7%	20.9%	14.3%

Under $10k 1.7%

$10k–$15k 1.7%

$15k–$25k 6.7%

$25k–$35k 6.4%

$35k–$50k 6.7%

$50k–$75k 6.8%

$75k–$100k 9.9%

$100k–$150k 21.2%

$150k–$200k 12.7%

$200k+ 26.1%

Range	% of households
Under $10k	1.7%
$10k–$15k	1.7%
$15k–$25k	6.7%
$25k–$35k	6.4%
$35k–$50k	6.7%
$50k–$75k	6.8%
$75k–$100k	9.9%
$100k–$150k	21.2%
$150k–$200k	12.7%
$200k+	26.1%
Median income	$117,932

Housing

Home values

Under $50k 0.6%

$50k–$100k 1.0%

$150k–$200k 0.6%

$200k–$300k 0.7%

$300k–$500k 13.3%

$500k–$1M 76.5%

$1M+ 7.4%

Housing overview

Metric	Value
Median home value	$677,700
Median rent / month	$2,497
Owner occupied	59.5%
Renter occupied	40.5%
Vacant	3.0%
Single-family detached	53.2%
Large apartment buildings	8.9%
Mobile homes	0.0%
Median rooms	5.5
Avg household size (owned)	2.41

Year built

Era	%
2020 or later	0.1%
2010–2019	6.0%
2000–2009	5.7%
1990–1999	8.1%
1980–1989	10.6%
1970–1979	15.5%
1960–1969	15.0%
1950–1959	12.8%
1940–1949	5.9%
1939 or earlier	20.2%

Bedrooms

Size	% of units
No bedroom (studio)	2.0%
1 bedroom	14.9%
2 bedrooms	26.1%
3 bedrooms	40.2%
4 bedrooms	13.8%
5+ bedrooms	3.1%

Vehicles per household

Vehicles	% of households
No vehicle	8.1%
1 vehicle	38.2%
2 vehicles	36.9%
3 or more	16.8%

Heating fuel

Fuel type	%
Utility gas	57.6%
Electricity	16.0%
Propane / LP gas	1.7%
Fuel oil	23.4%
No fuel used	0.6%

Households & families

Household type	Count	%
Married-couple family	3,267	41.2%
Cohabiting couple	703	8.9%
Male householder, no spouse	1,944	24.5%
Female householder, no spouse	2,014	25.4%
Households with children under 18	1,346	17.0%
Households with seniors (65+)	2,631	33.2%
Average household size	2.30

Marital status

Status	Male	Female
Never married	44.3%	37.4%
Married	44.9%	39.7%
Separated	1.8%	1.3%
Widowed	3.7%	10.7%
Divorced	5.3%	10.9%

Education

Less than 9th grade 4.1%

Some HS, no diploma 2.8%

HS graduate 19.0%

Some college, no degree 10.3%

Associate's degree 8.9%

Bachelor's degree 28.7%

Graduate / professional 26.2%

Metric	%
HS diploma or higher	93.1%
Bachelor's or higher	54.9%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	225	6.0%
Kindergarten	121	3.2%
Elementary school	1,095	29.1%
High school	389	10.3%
College / grad school	1,930	51.3%

Employment

Industry of employment

Education & healthcare 26.3%

Professional & management 17.9%

Retail trade 11.3%

Manufacturing 9.5%

Finance & real estate 8.3%

Construction 7.1%

Arts, food & hospitality 5.4%

Public administration 4.7%

Other services 3.3%

Information 3.0%

Transportation & utilities 2.8%

Wholesale trade 0.3%

Agriculture & mining 0.2%

Occupation

Category	%
Management, business & arts	56.3%
Service	10.7%
Sales & office	19.3%
Natural resources & construction	7.2%
Production & transportation	6.6%

Employment type

Type	%
Private sector	84.2%
Government	11.1%
Self-employed	4.5%
Unpaid family workers	0.2%

Commute

Method	%
Drive alone	63.3%
Carpool	8.4%
Public transit	4.3%
Walk	2.4%
Work from home	17.4%
Other means	4.1%
Avg commute (minutes)	26.7

Poverty

All people 8.1%

Under 18 years 8.5%

18 and over 8.0%

Married-couple families 1.1%

Female-led households 10.4%

Income support

Source	% of households
Social Security	26.8%
Retirement income	19.9%
Supplemental Security	9.1%
Cash public assistance	0.6%
Food stamps / SNAP	5.5%

Health indicators

Condition	%
Obesity	20.8%
High blood pressure	25.2%
High cholesterol	28.0%
Diabetes	7.0%
Heart disease	4.5%
Stroke	2.1%
Asthma	9.5%
Arthritis	19.3%
Kidney disease	2.2%
Pulmonary disease	3.9%
Cancer	6.4%

Behavior / access	%
Smoking	9.4%
Binge drinking	16.6%
No physical activity	15.4%
Less than 7 hrs sleep	28.3%
Depression	16.9%
Fair or poor health	8.0%
Poor mental health	12.0%
Poor physical health	6.6%
No health insurance	5.7%
Visited doctor (checkup)	75.6%
Visited dentist	76.0%
Cholesterol screening	91.6%
Teeth loss	8.3%

Veterans & disability

Veterans	Count	%
Civilian veterans	321	2.0%

Disability	%
Any disability	12.9%
Under 18	3.6%
18–64 years	8.7%
65 and over	35.7%

Health insurance coverage

Type	%
Private insurance	83.3%
Public insurance	30.2%
No insurance	1.2%
Uninsured under 19	0.5%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	17,634	95.9%
Spanish	1,963	11.1%
Other Indo-European	806	4.6%
Asian & Pacific Islander	636	3.6%
Other languages	495	2.8%

Place of birth & citizenship

Origin	Count	%
Native born (US)	13,743	74.8%
Born in same state	13,388	72.8%
Born in different state	9,598	52.2%
Foreign born	355	1.9%
Naturalized citizen	4,636	25.2%
Not a US citizen	2,773	59.8%

Ancestry

Ancestry	Count	%
Italian	2,998	16.3%
French	1,900	10.3%
German	631	3.4%
Arab	398	2.2%
Norwegian	98	0.5%

Ancestry	Count	%
Polish	72	0.4%
Irish	48	0.3%
English	42	0.2%
Dutch	27	0.1%

Technology access

Metric	% of households
Computer access	43.1%
Internet access	92.7%

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

Frequently asked questions about ZIP code 02451

What city is ZIP code 02451 in?

ZIP code 02451 is primarily assigned to Waltham, Massachusetts.

What county is ZIP code 02451 in?

ZIP code 02451 falls within Middlesex County, Massachusetts.

How educated is the population of ZIP code 02451?

55% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

What is the typical home value in ZIP code 02451?

The median home value in ZIP code 02451 is $677,700.

What is the median household income in ZIP code 02451?

The median household income in ZIP code 02451 is $117,932, above the national median of ~$75,000.

What is the population of ZIP code 02451?

ZIP code 02451 has an estimated population of 18,379 residents, with a density of 3,455 people per square mile.

What timezone is ZIP code 02451 in?

ZIP code 02451 observes the EST timezone.