Waltham Population

1790–2026

65,284

2026 projection

1.7% since 2020 (increase)

010K20K30K40K50K60K70K18001850190019502000

Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.

Use the left and right arrow keys to inspect population observations.

Population by year

Population estimates for Waltham. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
202665,284+2470.38%
202565,037-1410.22%
202465,178+1760.27%
202365,002+3740.58%
202264,628+1060.16%
202164,522+3320.52%
202064,190+1,7302.77%
201962,460-1220.19%
201862,582-2770.44%
201762,859-1400.22%

Showing 10 of 39 years.

Waltham Demographics

34.4median age

Median age

Female35.1 yrs
Male33.8 yrs

Adults

56,054
10,228 seniors · 18%45,826 other adults

Sex

Female 50% · 32,449Male 50% · 32,453

Population by age

MaleFemale85+ years, male: 29785+ years, female: 72980–84 years, male: 68780–84 years, female: 76575–79 years, male: 82275–79 years, female: 1,32770–74 years, male: 1,02070–74 years, female: 1,29165–69 years, male: 1,50365–69 years, female: 1,78760–64 years, male: 1,76860–64 years, female: 1,45455–59 years, male: 1,85555–59 years, female: 1,76250–54 years, male: 1,75650–54 years, female: 1,59745–49 years, male: 1,54445–49 years, female: 1,50840–44 years, male: 2,02740–44 years, female: 1,61835–39 years, male: 2,20635–39 years, female: 2,45030–34 years, male: 3,25430–34 years, female: 2,59525–29 years, male: 3,12325–29 years, female: 2,59520–24 years, male: 4,19020–24 years, female: 4,24415–19 years, male: 2,65615–19 years, female: 2,65510–14 years, male: 1,01010–14 years, female: 1,0275–9 years, male: 1,1755–9 years, female: 1,4330–4 years, male: 1,5600–4 years, female: 1,61285+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–42K2K

Hover or tap an age group to see exact counts. Use the up and down arrow keys to inspect age groups.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101

Race and ethnicity

Tap a square or a group below to highlight it.

Each square is about 1% of residents (roughly 649 people).

Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002

Waltham Income

$120,216median household income

Median household income

$120,216

Half of households earn more, half earn less

Median earnings

$75,552

Typical yearly pay for a worker 25 or older.

Poverty rate

9.4%

About 1 in 11 residents

U.S. Census Bureau, 2024 ACS 5-year estimates · Tables S1901, S1501, S1701

Waltham Marital Status

39% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married39%39%38%
Never married49%53%45%
Divorced7%6%8%
Widowed5%2%7%
Separated1%<1%2%

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201

Sources

10 sources, all from the U.S. Census Bureau

Population

American Community Survey, 2024 5-year