Belmont, Massachusetts Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
Belmont, MA Population Density Map and Area Scores
Area Score
Health, income and education, each graded from F to A+. Explore interactive maps for deeper analysis.
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A+
Health Top grade
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A+
Income Top grade
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A+
Education Top grade
Source: Map AI Methodology
Population
| Metric | Belmont | Massachusetts Avg | U.S. Average |
|---|---|---|---|
| Population | 27,165 | 7,031,620 | 337,468,954 |
| Population density (per sq mi) | 5757.7 | 666.0 | 86.4 |
| Population growth (%/yr) | 0.74% | 0.53% | 0.59% |
| Median age | 41.6 | 39.0 | 37.3 |
| Households | 10,395 | 2,777,931 | 130,235,071 |
Population in Belmont grew by 15.5% from 2009 to 2024, reaching 27,165 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in Belmont is Gen X, aged 45–60, at 23.3% of residents. That is 2.2 points above Massachusetts as a whole.
- Gen Z 13–28 4,438 16.3% -5.2 pts
- Millennials 29–44 5,915 21.8% -0.2 pts
- Gen X 45–60 6,330 23.3% +2.2 pts
- Boomers 61–79 4,858 17.9% +0.6 pts
Residents by birth cohort, from the 2025 age distribution. The right-hand figure is how far each cohort's share sits above or below Massachusetts, in percentage points. Children younger than Gen Z and the generations before the Boomers are counted in the population but not shown here, so these shares do not add up to 100%.
Male and female share
Women are 52.5% of the people living in Belmont and men 47.5%.
- Women 52.5% Massachusetts 51.2%
- Men 47.5% Massachusetts 48.8%
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Economy
Belmont has a the economy index of A+, which means it is exceptionally prosperous.
| Metric | Belmont | Massachusetts Avg | U.S. Average |
|---|---|---|---|
| Median household income | $187,422 | $104,336 | $80,455 |
| Income growth (%/yr) | 6.60% | 4.91% | 4.80% |
| Unemployment rate | 4.3% | 5.1% | 5.2% |
The median household income in Belmont is about 80% higher than in Massachusetts.
Housing
| Metric | Belmont | Massachusetts Avg | U.S. Average |
|---|---|---|---|
| Median home price | $2,163,043 | $494,523 | $248,835 |
| Median rent | $2,527 | $1,761 | $1,407 |
| Homeownership rate | 64.7% | 62.5% | 65.2% |
The median home price in Belmont is about 71.3 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $2,527 per month for that long.
Commute Time & Mobility
Commuters in Belmont spend about 61 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 256 hours, about 10.7 full days, spent commuting.
| Metric | Belmont | Massachusetts Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 30.7 | 25.6 | 22.4 |
| Round-trip commute (min) | 61.4 | 51.1 | 44.8 |
| Yearly time spent (hours) | 256 | 213 | 187 |
| Estimated yearly cost | $7,925 | $6,603 | $5,790 |
| Work from home | 31.5% | 18.6% | 15.0% |
| Highway traffic (vehicles/day) | 12,966 | 14,741 | 8,813 |
| Local road traffic (vehicles/day) | 3,484 | 2,164 | 1,355 |
The average commute time in Belmont is 31 minutes, longer than the 26 minutes in Massachusetts.
Estimated yearly cost applies a single national wage rule of thumb (U.S. Bureau of Labor Statistics average hourly earnings), not a measurement of wages in this area. Traffic volume figures come from proprietary Ticon and TrafficZoom data.
Education & Households
Belmont has a education index of A+, which means it is exceptionally educated.
| Metric | Belmont | Massachusetts Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 76.4% | 42.7% | 31.6% |
| Average household size | 2.59 | 2.44 | 2.53 |
Health
Belmont has a health index of A+, which means it is exceptionally healthy.
| Metric | Belmont | Massachusetts Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 83.1 | 80.5 | 78.3 |
| Self-rated poor health | 6.9% | 11.8% | 16.3% |
| Smokers | 7.5% | 13.9% | 19.0% |
Belmont, MA Compared With Nearby Cities
Belmont, MA is the 5th largest of the 6 cities compared here, 27,165 residents against a local median of 46,270. Where Belmont, MA breaks from the cities next to it is median home price, sitting 105% above the local median of $1,053,396 at $2,163,043.
Median household income tells the same story from another angle: $187,422 against a local median of $131,513, 43% above it. The picture is mixed rather than uniform: median household income runs ahead of the neighbourhood while commute runs behind it, so Belmont, MA is trading one against the other rather than simply out-performing what surrounds it. The cities themselves spread $1,106,311 on median home price, so Belmont, MA sits at one end of an already wide local range rather than apart from it. Belmont, MA has the highest median home price of the 6 areas compared here.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| Belmont, MA | 27,165 | $187,422 #2/6 | $2,163,043 #1/6 | 30.7 min #4/6 |
| Watertown, MA | 35,594 | $126,987 | $1,053,396 | 26.2 min |
| Arlington, MA | 46,270 | $151,416 | $1,743,589 | 31.5 min |
| Waltham, MA | 64,842 | $118,718 | $637,278 | 22.3 min |
| Cambridge, MA | 117,266 | $131,513 | $678,104 | 23.7 min |
| Winchester, MA | 23,377 | $205,856 | $1,250,000 | 31.2 min |
Frequently Asked Questions
Common questions about Belmont, Massachusetts.
How many people live in Belmont, Massachusetts?
About 27,165 people live in Belmont, Massachusetts, in 10,395 households of 2.6 people on average. The median age is 41.6, so residents are older than the U.S. median of 37.3 by about 4 years.
Is Belmont, Massachusetts urban or rural?
Averaged over its land area, Belmont, Massachusetts has 5,758 people per square mile, a density typical of a city. That is about 67 times the U.S. average of 86.
How affordable is housing in Belmont, Massachusetts?
The median home costs 11.5 times the median household income ($2,163,043 against $187,422), compared with 3.1 times nationally. A ratio of about 3 is traditionally considered affordable. Median rent of $2,527 a month takes about 16% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
How common is a college degree in Belmont, Massachusetts?
76.4% of adults in Belmont, Massachusetts hold a bachelor's degree or higher (about 8 in 10), well above the U.S. share of 31.6%.
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