Demographics of Waltham city, Massachusetts

Waltham city, Massachusetts had 65,037 people on July 1, 2025, by the Census Bureau’s estimate: +847 since July 2020. Age, income, poverty, housing and origin below come from the survey, averaged over 2020–2024, each with its margin of error.

Waltham city, in four figures

65,037
Population: July 1, 2025, Vintage 2025 estimate. The survey’s 2020–⁠2024 figure is 64,902 ±43.; +1.3%
Change since July 2020: +847 people.; 34.4 ±1.0
Median age: ACS 2020–⁠2024.; $120,216 ±$7,308
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. The Bureau publishes no births, deaths or migration for a place, so the change is the difference between one July estimate and the next.

Waltham city, Massachusetts's population grew 1.3% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Waltham city, Massachusetts's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

Source: The Census Bureau

About this chart

The figures

Waltham city, Massachusetts's population grew 1.3% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Waltham city, Massachusetts's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	64,190	100.0	100.0
2021	64,522	100.5	100.2
2022	64,628	100.7	100.7
2023	65,002	101.3	101.6
2024	65,178	101.5	102.5
2025	65,037	101.3	103.1

Population of Waltham city, Massachusetts on July 1 of each year, Vintage 2025
July 1	Population	Change
2020	64,190	—
2021	64,522	+332
2022	64,628	+106
2023	65,002	+374
2024	65,178	+176
2025	65,037	−141

Age, 2020–2024

The median age is 34.4 ±1.0: for men 33.8 ±1.2 and for women 35.1 ±1.5. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Waltham city by age, ACS 2020–2024
Age	People	Share	Massachusetts	United States
Under 5	3,172 ±459	4.9% ±0.7	5.0% ±<0.1	5.6% ±<0.1
5 to 17	5,676 ±587	8.7% ±0.9	14.4% ±0.1	16.3% ±<0.1
18 to 24	12,714 ±1,128	19.6% ±1.7	9.8% ±0.1	9.1% ±<0.1
25 to 44	19,868 ±1,090	30.6% ±1.7	27.1% ±0.1	26.9% ±<0.1
45 to 64	13,244 ±1,023	20.4% ±1.6	25.9% ±0.1	24.8% ±<0.1
65 and over	10,228 ±738	15.8% ±1.1	17.9% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $120,216 ±$7,308, and income per person $58,449 ±$2,740, in 2024 dollars. The median is $103,960 ±$527 in Massachusetts and $80,734 ±$166 in the United States.

Households by income

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Households in Waltham city by income, ACS 2020–2024
Household income	Households	Share	Massachusetts	United States
Under $25,000	3,042 ±504	11.9% ±2.0	13.2% ±0.2	14.6% ±<0.1
$25,000 to $49,999	3,006 ±488	11.8% ±1.9	12.5% ±0.2	16.7% ±<0.1
$50,000 to $74,999	2,410 ±373	9.5% ±1.4	12.0% ±0.2	15.5% ±<0.1
$75,000 to $99,999	2,399 ±350	9.4% ±1.4	10.7% ±0.2	12.6% ±<0.1
$100,000 to $149,999	4,920 ±733	19.3% ±2.8	17.5% ±0.2	17.5% ±<0.1
$150,000 to $199,999	3,376 ±461	13.2% ±1.8	11.9% ±0.1	9.6% ±<0.1
$200,000 or more	6,345 ±572	24.9% ±2.2	22.3% ±0.2	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Waltham city by age, ACS 2020–2024
Age	Below poverty	Rate	Massachusetts	United States
All ages	5,392 ±925	9.4% ±1.6	10.0% ±0.1	12.5% ±0.1
Under 18	662 ±292	7.6% ±3.3	11.7% ±0.3	16.1% ±0.1
18 to 59	3,349 ±640	9.4% ±1.8	9.3% ±0.2	11.6% ±0.1
60 and over	1,381 ±360	10.5% ±2.6	10.4% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Waltham city, ACS 2020–2024
Measure	Waltham city	Massachusetts	United States
Housing units	26,728 ±625	3,030,406 ±453	143,775,355 ±10,234
Occupied	95.4% ±0.4	91.9% ±0.2	89.9% ±0.1
Vacant	4.6% ±1.3	8.1% ±0.2	10.1% ±0.1
Owner occupied	49.7% ±2.4	62.5% ±0.3	65.2% ±0.3
Renter occupied	50.3% ±2.6	37.5% ±0.2	34.8% ±0.1
Median home value	$748,700 ±$27,073	$562,100 ±$2,169	$332,700 ±$236
Median gross rent	$2,268 ±$79	$1,762 ±$9	$1,413 ±$2
Median year built	1961 ±2	1964 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Waltham city by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Massachusetts	United States
Hispanic or Latino	10,317 ±1,461	15.9% ±2.3	13.3% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	37,383 ±1,598	57.6% ±2.5	66.6% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	5,406 ±1,001	8.3% ±1.5	6.4% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	8,189 ±1,203	12.6% ±1.9	7.3% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	66 to 272	0.1% to 0.4%	0.1% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	41 to 153	0.1% to 0.2%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	243 to 881	0.4% to 1.4%	1.2% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	2,779 ±570	4.3% ±0.9	5.1% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Waltham city by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Massachusetts	United States
Born in the state	30,535 ±1,317	47.0% ±2.0	58.7% ±0.2	57.3% ±<0.1
Born in another state	15,637 ±1,093	24.1% ±1.7	20.3% ±0.2	26.9% ±<0.1
Born a citizen outside the states	1,675 ±429	2.6% ±0.7	2.9% ±0.1	1.7% ±<0.1
Born abroad	17,055 ±1,412	26.3% ±2.2	18.0% ±0.1	14.1% ±<0.1
Naturalized citizens	7,774 ±928	12.0% ±1.4	9.7% ±0.1	7.4% ±<0.1
Not citizens	9,281 ±1,174	14.3% ±1.8	8.3% ±0.1	6.8% ±<0.1

Waltham city among the places and towns of Massachusetts

17th of 291 places and towns of 5,000 or more by the survey’s 2020–2024 count. Every one is listed on the Massachusetts page.

Places of Massachusetts near Waltham city in population, ACS 2020–2024
Place	ACS 2020–⁠2024
Lawrence city	88,736 ±36
Somerville city	81,036 ±33
Framingham city	72,399 ±45
Haverhill city	67,698 ±63
Malden city	65,906 ±67
Waltham city	64,902 ±43
Plymouth town	63,953 ±79
Brookline CDP	63,266 ±43
Taunton city	60,433 ±50
Revere city	60,012 ±53
Medford city	59,354 ±38

Elsewhere on the site

Reported crime in Waltham city, Massachusetts

Rankings this appears in

Sources

Census Bureau population estimates — incorporated places and New England towns — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Compiled automatically from Census Bureau population estimates — incorporated places and New England towns and American Community Survey 5-year estimates — table-based Summary File by a checked SQL query · Editor: Kian O'Connor · How this site is built

Data retrieved September 25, 2026