Population 53,169 · Census ACS 2020–24
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Population and households in Diamond Bar
Household size in Diamond Bar
| Period | Diamond Bar | Los Angeles area | California | U.S. |
|---|---|---|---|---|
| 2006–10 | 3.13 | 3.14 | 3.04 | 2.68 |
| 2010–14 | 3.25 | 3.20 | 3.10 | 2.73 |
| 2015–19 | 3.12 | 3.16 | 3.09 | 2.71 |
| 2020–24 | 2.99 | 3.01 | 3.01 | 2.65 |
| Change | −0.14 | −0.13 | −0.03 | −0.03 |
Diamond Bar is a place of big households: 2.99 people per home on average, compared with 2.65 nationally. Numbers like that usually point to plenty of families with kids. Since 2006–10, household size has dropped from 3.13, a much bigger shift than nationally.
Household size: the average number of people living in each occupied home. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25010).
Median age in Diamond Bar
| Period | Diamond Bar | Los Angeles area | California | U.S. |
|---|---|---|---|---|
| 2006–10 | 40.6 | 35.6 | 35.8 | 37.7 |
| 2010–14 | 41.6 | 36.7 | 36.8 | 38.6 |
| 2015–19 | 43.5 | 38.0 | 37.9 | 39.6 |
| 2020–24 | 46.0 | 39.5 | 39.0 | 40.1 |
| Change | +5.4 | +4.0 | +3.1 | +2.3 |
Diamond Bar skews older: half of its residents are older than 46.0, well above the national median of 40.1. That usually means more empty nesters and retirees, and fewer young families. The median age has climbed from 40.6 in 2006–10, in line with the national trend.
Median age: the age that splits residents into two equal halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B01002).
Single-parent households in Diamond Bar
| Period | Diamond Bar | Los Angeles area | California | U.S. |
|---|---|---|---|---|
| 2006–10 | 8.3% | 14.3% | 13.5% | 12.3% |
| 2010–14 | 8.7% | 14.1% | 13.5% | 12.3% |
| 2015–19 | 7.1% | 12.5% | 12.3% | 11.6% |
| 2020–24 | 8.7% | 12.3% | 12.3% | 11.6% |
| Change | +0.4 pts | −2.0 pts | −1.2 pts | −0.6 pts |
Single-parent households are less common in Diamond Bar than nationally: 8.7%, against 11.6%. Diamond Bar has a lower share of single-parent households than most California cities.
Single-parent households: households where one adult with no spouse present lives with children under 18. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B11003).
Housing in Diamond Bar
Renters in Diamond Bar
| Period | Diamond Bar | Los Angeles area | California | U.S. |
|---|---|---|---|---|
| 2006–10 | 16.2% | 48.8% | 42.6% | 33.3% |
| 2010–14 | 20.8% | 50.8% | 45.2% | 35.6% |
| 2015–19 | 24.1% | 51.4% | 45.2% | 36.0% |
| 2020–24 | 22.7% | 51.6% | 44.1% | 34.8% |
| Change | +6.5 pts | +2.8 pts | +1.5 pts | +1.5 pts |
Only 22.7% of households in Diamond Bar rent their homes, far below the national share of 34.8%, so most residents are owners who tend to stay put. Among homeowners, 39.0% have no mortgage at all, about the same as nationally. Rentals cluster in the center; owners are most common in the north. The renter share is up 6.5 points from 2006–10, a much bigger shift than nationally.
Renters: occupied homes that are rented rather than owned. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25003).
Vacant homes in Diamond Bar
| Period | Diamond Bar | Los Angeles area | California | U.S. |
|---|---|---|---|---|
| 2006–10 | 3.7% | 7.0% | 8.7% | 11.4% |
| 2010–14 | 5.3% | 6.7% | 8.1% | 11.4% |
| 2015–19 | 5.2% | 6.6% | 7.5% | 11.1% |
| 2020–24 | 5.7% | 6.7% | 7.3% | 9.6% |
| Change | +2.0 pts | −0.3 pts | −1.4 pts | −1.8 pts |
Fewer homes sit empty in Diamond Bar than nationally: 5.7%, against 9.6% for the U.S. The Los Angeles area as a whole looks much the same. Vacancy is up 2.0 points from 2006–10, even as the national rate fell.
Vacant homes: homes with no one living in them, including vacation homes and homes for sale or rent. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25002).
Age of homes in Diamond Bar
| Period | Diamond Bar | Los Angeles area | California | U.S. |
|---|---|---|---|---|
| 2006–10 | 1979 | 1965 | 1972 | 1974 |
| 2010–14 | 1978 | 1966 | 1973 | 1975 |
| 2015–19 | 1979 | 1966 | 1974 | 1977 |
| 2020–24 | 1978 | 1969 | 1976 | 1980 |
| Change | −0 | +4 | +4 | +6 |
Homes in Diamond Bar are about the same age as the nation's housing: the median home was built in 1978, versus 1980 nationally. Homes here are newer than in the Los Angeles area as a whole, where the median home dates to 1969.
Age of homes: the year that splits the housing stock into older and newer halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25035).
Rent in Diamond Bar
| Period | Diamond Bar | Los Angeles area | California | U.S. |
|---|---|---|---|---|
| 2006–10 | $1,717 | $1,328 | $1,298 | $965 |
| 2010–14 | $1,808 | $1,415 | $1,379 | $1,040 |
| 2015–19 | $2,203 | $1,755 | $1,721 | $1,213 |
| 2020–24 | $2,536 | $2,279 | $2,229 | $1,571 |
| Change | +$819 | +$951 | +$931 | +$606 |
The median renter in Diamond Bar pays $2,536 a month for rent and utilities, well above the national median of $1,571. Rents are up $819 a month from 2006–10, a 48% rise, a slower climb than the nation's. The typical renter here spends 37.2% of household income on rent, well over the 30% mark often used to define affordable rent, so many renters here are stretched. The priciest rents are in the center; the most affordable are in the northeast.
Rent: monthly rent plus the utilities renters pay themselves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25064).
Education in Diamond Bar
Bachelor's degrees in Diamond Bar
| Period | Diamond Bar | Los Angeles area | California | U.S. |
|---|---|---|---|---|
| 2006–10 | 48.4% | 29.7% | 29.1% | 28.4% |
| 2010–14 | 48.3% | 30.7% | 30.1% | 29.6% |
| 2015–19 | 55.4% | 33.7% | 32.9% | 32.1% |
| 2020–24 | 52.6% | 37.6% | 36.3% | 35.6% |
| Change | +4.2 pts | +7.9 pts | +7.1 pts | +7.2 pts |
College graduates are unusually common in Diamond Bar: 52.6% of adults 25 and older have a bachelor's degree or higher, against 35.6% nationally. Education tends to track local incomes and the kinds of jobs nearby. The share with a degree is up 4.2 points from 2006–10, mirroring the country.
Bachelor's degrees: adults 25 and older with a bachelor's degree or higher. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
High school graduates in Diamond Bar
| Period | Diamond Bar | Los Angeles area | California | U.S. |
|---|---|---|---|---|
| 2006–10 | 92.8% | 76.7% | 79.9% | 84.9% |
| 2010–14 | 91.6% | 77.7% | 80.7% | 86.1% |
| 2015–19 | 94.3% | 80.0% | 82.6% | 87.7% |
| 2020–24 | 92.2% | 82.1% | 84.2% | 89.3% |
| Change | −0.6 pts | +5.4 pts | +4.3 pts | +4.3 pts |
High school completion in Diamond Bar is a bit above the national rate: 92.2% of adults have a diploma or equivalent, against 89.3%. Since 2006–10, the share with a diploma has edged down 0.6 points, even as the national rate rose.
High school graduates: adults 25 and older with a high school diploma, GED or more. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
Jobs in Diamond Bar
| Period | Diamond Bar | Los Angeles area | California | U.S. |
|---|---|---|---|---|
| 2006–10 | 5.1% | 8.5% | 9.2% | 8.1% |
| 2010–14 | 7.8% | 10.6% | 11.3% | 9.4% |
| 2015–19 | 5.6% | 5.8% | 6.3% | 5.6% |
| 2020–24 | 5.0% | 6.7% | 6.6% | 5.4% |
| Change | −0.1 pts | −1.7 pts | −2.6 pts | −2.7 pts |
Unemployment in Diamond Bar is close to the national rate: 5.0% of the labor force, against 5.4%. The rate is lower than in the Los Angeles area as a whole (6.7%). Because the Census pools five years of responses (2020–24), these rates smooth over short swings and lag the current job market.
Unemployment: people looking for work as a share of everyone working or looking. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B23025).
Diamond Bar compared with nearby cities
| City | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| Diamond Bar | 2.99 | 46.0 | 8.7% | 22.7% | 5.7% | 1978 | $2,536 | 52.6% | 92.2% | 5.0% |
| Walnut | 3.22 | 46.4 | 8.9% | 16.5% | 7.0% | 1980 | $3,092 | 55.9% | 94.0% | 3.7% |
| Rowland Heights | 3.04 | 47.1 | 8.3% | 31.8% | 4.7% | 1975 | $2,491 | 36.1% | 85.1% | 5.8% |
| South San Jose Hills | 4.11 | 36.1 | 18.0% | 40.7% | 5.6% | 1968 | $1,933 | 13.0% | 67.7% | 6.7% |
| Pomona | 3.52 | 36.9 | 16.1% | 45.8% | 5.0% | 1967 | $1,976 | 19.5% | 72.7% | 6.4% |
| Chino Hills | 3.08 | 41.2 | 7.1% | 30.5% | 3.7% | 1991 | $2,997 | 48.5% | 93.3% | 6.6% |
| Industry | 3.13 | 39.3 | 11.3% | 34.6% | 4.7% | 1970 | $2,237 | 27.5% | 82.6% | 4.5% |
| Brea | 2.86 | 40.7 | 6.6% | 39.8% | 5.5% | 1981 | $2,610 | 52.0% | 92.8% | 4.6% |
| West Covina | 3.33 | 41.3 | 14.1% | 37.0% | 5.3% | 1965 | $2,303 | 30.1% | 85.2% | 7.0% |
| San Dimas | 2.82 | 41.0 | 12.5% | 27.4% | 4.0% | 1973 | $2,550 | 39.3% | 92.9% | 5.3% |
| Valinda | 4.37 | 40.5 | 10.8% | 21.0% | 6.4% | 1958 | $1,999 | 17.8% | 71.8% | 4.2% |
All figures 2020–24.
Cities with similar populations: Chambersburg, PA · Gallatin, TN · Downers Grove, IL · Delano, CA · Covington, LA · Ceres, CA · West Sacramento, CA · Westfield, IN · Blacksburg, VA · Aspen Hill, MD
About these numbers
Every figure on this page is a BestNeighborhood calculation from the Census Bureau's American Community Survey (ACS), built up from the Census block groups that make up Diamond Bar. Each ACS 5-year release pools five years of responses; this page shows the last 15 releases, 2006–10 through 2020–24. Neighboring releases share four of their five years, so they move gradually and small changes between them are within the survey's margin of error; in small places the lines can jump from one release to the next for the same reason. The maps show the same measures for each neighborhood, ranked against the whole country.
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