Diamond Bar, California Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
Diamond Bar, CA 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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B
Income Around average
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A+
Education Top grade
Source: Map AI Methodology
Population
| Metric | Diamond Bar | California Avg | U.S. Average |
|---|---|---|---|
| Population | 46,382 | 39,245,658 | 337,468,954 |
| Population density (per sq mi) | 3116.5 | 239.4 | 86.4 |
| Population growth (%/yr) | -0.23% | 0.19% | 0.59% |
| Median age | 46.9 | 35.5 | 37.3 |
| Households | 15,679 | 13,531,619 | 130,235,071 |
Population in Diamond Bar declined by 3.5% from 2009 to 2024, reaching 46,382 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in Diamond Bar is Gen X, aged 45–60, at 25.2% of residents. That is 5.3 points above California as a whole.
- Gen Z 13–28 8,988 19.4% -2.3 pts
- Millennials 29–44 8,923 19.2% -4.4 pts
- Gen X 45–60 11,688 25.2% +5.3 pts
- Boomers 61–79 8,850 19.1% +3.8 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 California, 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 52.2% of the people living in Diamond Bar and men 47.8%.
- Women 52.2% California 49.9%
- Men 47.8% California 50.1%
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Residents matching this profile
100% of everyone living in Diamond Bar
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Economy
Diamond Bar has a the economy index of B, which means it is quite prosperous.
| Metric | Diamond Bar | California Avg | U.S. Average |
|---|---|---|---|
| Median household income | $107,781 | $99,161 | $80,455 |
| Income growth (%/yr) | 2.49% | 5.57% | 4.80% |
| Unemployment rate | 5.0% | 6.6% | 5.2% |
The median household income in Diamond Bar is about 9% higher than in California.
Housing
| Metric | Diamond Bar | California Avg | U.S. Average |
|---|---|---|---|
| Median home price | $1,293,304 | $650,794 | $248,835 |
| Median rent | $2,566 | $2,036 | $1,407 |
| Homeownership rate | 76.6% | 55.9% | 65.2% |
The median home price in Diamond Bar is about 42.0 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $2,566 per month for that long.
Commute Time & Mobility
Commuters in Diamond Bar spend about 63 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 262 hours, about 10.9 full days, spent commuting.
| Metric | Diamond Bar | California Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 31.4 | 23.5 | 22.4 |
| Round-trip commute (min) | 62.8 | 47.0 | 44.8 |
| Yearly time spent (hours) | 262 | 196 | 187 |
| Estimated yearly cost | $8,112 | $6,065 | $5,790 |
| Work from home | 18.4% | 17.2% | 15.0% |
| Highway traffic (vehicles/day) | 48,575 | 16,509 | 8,813 |
| Local road traffic (vehicles/day) | 3,780 | 2,449 | 1,355 |
The average commute time in Diamond Bar is 31 minutes, longer than the 23 minutes in California.
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
Diamond Bar has a education index of A+, which means it is exceptionally educated.
| Metric | Diamond Bar | California Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 49.9% | 33.0% | 31.6% |
| Average household size | 2.94 | 2.84 | 2.53 |
Health
Diamond Bar has a health index of A+, which means it is exceptionally healthy.
| Metric | Diamond Bar | California Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 84.4 | 79.6 | 78.3 |
| Self-rated poor health | 9.2% | 16.4% | 16.3% |
| Smokers | 6.6% | 13.9% | 19.0% |
Diamond Bar, CA Compared With Nearby Cities
Diamond Bar, CA is typical in size for this group, 46,382 residents against a local median of 43,163, so the measures below are close to a like for like comparison. Diamond Bar, CA's median home price, at $1,293,304, runs 58% above the $820,900 typical of the cities around it.
The cities themselves spread $718,893 on median home price, so Diamond Bar, CA sits at one end of an already wide local range rather than apart from it. Diamond Bar, CA has the highest median home price of the 5 areas compared here.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| Diamond Bar, CA | 46,382 | $107,781 #3/5 | $1,293,304 #1/5 | 31.4 min #5/5 |
| Walnut, CA | 27,757 | $130,123 | $1,112,146 | 30.8 min |
| Pomona, CA | 148,496 | $80,439 | $529,653 | 28.2 min |
| Rowland Heights, CA | 44,324 | $88,543 | $1,191,551 | 31.0 min |
| Brea, CA | 42,002 | $122,393 | $472,658 | 28.3 min |
Frequently Asked Questions
Common questions about Diamond Bar, California.
What is the population of Diamond Bar, California?
About 46,382 people live in Diamond Bar, California, in 15,679 households of 2.9 people on average. The median age is 46.9, so residents are older than the U.S. median of 37.3 by about 10 years.
How densely populated is Diamond Bar, California?
Averaged over its land area, Diamond Bar, California has 3,116 people per square mile, a density typical of a city. That is about 36 times the U.S. average of 86.
How affordable is housing in Diamond Bar, California?
The median home costs 12.0 times the median household income ($1,293,304 against $107,781), compared with 3.1 times nationally. A ratio of about 3 is traditionally considered affordable. Median rent of $2,566 a month takes about 29% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
What share of adults in Diamond Bar, California have a college degree?
49.9% of adults in Diamond Bar, California hold a bachelor's degree or higher (about 1 in 2), well above the U.S. share of 31.6%.
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