Population 21,698 · Census ACS 2020–24
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Population and households in Diamond Head-Kapahulu-St Louis
Household size in Diamond Head-Kapahulu-St Louis
| Period | Diamond Head-Kapahulu-St Louis | Honolulu area | Hawaii | U.S. |
|---|---|---|---|---|
| 2006–10 | 2.42 | 3.21 | 3.12 | 2.68 |
| 2010–14 | 2.48 | 3.29 | 3.20 | 2.73 |
| 2015–19 | 2.52 | 3.26 | 3.18 | 2.71 |
| 2020–24 | 2.46 | 3.10 | 3.06 | 2.65 |
| Change | +0.04 | −0.11 | −0.06 | −0.03 |
The average household in Diamond Head-Kapahulu-St Louis has 2.46 people, under the U.S. average of 2.65. Since 2006–10, household size has crept up from 2.42, even as the national average fell. The biggest households, usually families with children, are concentrated in the southeast.
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 Head-Kapahulu-St Louis
| Period | Diamond Head-Kapahulu-St Louis | Honolulu area | Hawaii | U.S. |
|---|---|---|---|---|
| 2006–10 | 43.7 | 38.5 | 39.1 | 37.7 |
| 2010–14 | 44.6 | 39.2 | 39.8 | 38.6 |
| 2015–19 | 44.0 | 40.2 | 41.0 | 39.6 |
| 2020–24 | 46.2 | 41.5 | 42.3 | 40.1 |
| Change | +2.5 | +3.0 | +3.2 | +2.3 |
Diamond Head-Kapahulu-St Louis skews older: half of its residents are older than 46.2, 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 43.7 in 2006–10, as it has nationally.
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 Head-Kapahulu-St Louis
| Period | Diamond Head-Kapahulu-St Louis | Honolulu area | Hawaii | U.S. |
|---|---|---|---|---|
| 2006–10 | 6.1% | 11.4% | 11.8% | 12.3% |
| 2010–14 | 6.8% | 10.8% | 11.3% | 12.3% |
| 2015–19 | 5.7% | 10.0% | 10.5% | 11.6% |
| 2020–24 | 6.4% | 10.9% | 11.6% | 11.6% |
| Change | +0.4 pts | −0.5 pts | −0.2 pts | −0.6 pts |
Single-parent households are relatively rare in Diamond Head-Kapahulu-St Louis: 6.4% of households, against 11.6% nationally. The single-parent share is little changed from 2006–10, while the national share fell.
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 Head-Kapahulu-St Louis
Renters in Diamond Head-Kapahulu-St Louis
| Period | Diamond Head-Kapahulu-St Louis | Honolulu area | Hawaii | U.S. |
|---|---|---|---|---|
| 2006–10 | 48.1% | 42.4% | 40.7% | 33.3% |
| 2010–14 | 49.7% | 45.1% | 42.9% | 35.6% |
| 2015–19 | 48.4% | 43.8% | 41.1% | 36.0% |
| 2020–24 | 50.1% | 40.2% | 37.0% | 34.8% |
| Change | +2.0 pts | −2.2 pts | −3.7 pts | +1.5 pts |
Renters far outnumber owners in Diamond Head-Kapahulu-St Louis: 50.1% of households rent their homes, against 34.8% nationally. More than four in ten owners (45.2%) have paid off their mortgages, above the national share of 39.8%. Renting is most common in the northwest and least common in the southeast. The renter share is up 2.0 points from 2006–10, mirroring the country.
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 Head-Kapahulu-St Louis
| Period | Diamond Head-Kapahulu-St Louis | Honolulu area | Hawaii | U.S. |
|---|---|---|---|---|
| 2006–10 | 8.6% | 9.1% | 11.2% | 11.4% |
| 2010–14 | 11.5% | 8.2% | 11.2% | 11.4% |
| 2015–19 | 14.0% | 9.1% | 11.9% | 11.1% |
| 2020–24 | 14.4% | 8.9% | 10.8% | 9.6% |
| Change | +5.8 pts | −0.2 pts | −0.3 pts | −1.8 pts |
Vacant homes make up 14.4% of the housing in Diamond Head-Kapahulu-St Louis, far above the national rate of 9.6%. In resort and lake areas that usually means seasonal and vacation homes; elsewhere it can point to weak demand. Since 2006–10, vacancy has risen 5.8 points, 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 Head-Kapahulu-St Louis
| Period | Diamond Head-Kapahulu-St Louis | Honolulu area | Hawaii | U.S. |
|---|---|---|---|---|
| 2006–10 | 1962 | 1975 | 1977 | 1974 |
| 2010–14 | 1963 | 1976 | 1978 | 1975 |
| 2015–19 | 1964 | 1977 | 1979 | 1977 |
| 2020–24 | 1968 | 1979 | 1981 | 1980 |
| Change | +5 | +4 | +4 | +6 |
The housing in Diamond Head-Kapahulu-St Louis is old by national standards: the median home dates to 1968, against 1980 for the U.S., so buyers will find more older houses, some of them due for updates. The median year built has moved up from 1962 in 2006–10, a sign of steady new building. Newer construction is concentrated in the west, while the southeast has the oldest housing.
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 Head-Kapahulu-St Louis
| Period | Diamond Head-Kapahulu-St Louis | Honolulu area | Hawaii | U.S. |
|---|---|---|---|---|
| 2006–10 | $1,282 | $1,466 | $1,393 | $965 |
| 2010–14 | $1,544 | $1,594 | $1,482 | $1,040 |
| 2015–19 | $1,762 | $2,010 | $1,829 | $1,213 |
| 2020–24 | $2,135 | $2,359 | $2,199 | $1,571 |
| Change | +$853 | +$894 | +$806 | +$606 |
Rent in Diamond Head-Kapahulu-St Louis runs $2,135 a month at the median, utilities included, well above the U.S. median of $1,571. Still, rents here are lower than in the wider Honolulu area ($2,359). Rents are up $853 a month from 2006–10, a 67% jump, faster than rents rose nationally. Rent takes 33.4% of the typical renter's income, well over the 30% mark often used to define affordable rent, so many renters here are stretched.
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 Head-Kapahulu-St Louis
Bachelor's degrees in Diamond Head-Kapahulu-St Louis
| Period | Diamond Head-Kapahulu-St Louis | Honolulu area | Hawaii | U.S. |
|---|---|---|---|---|
| 2006–10 | 38.0% | 30.4% | 28.9% | 28.4% |
| 2010–14 | 41.8% | 31.6% | 29.8% | 29.6% |
| 2015–19 | 43.8% | 34.3% | 32.5% | 32.1% |
| 2020–24 | 49.5% | 37.3% | 35.3% | 35.6% |
| Change | +11.5 pts | +6.9 pts | +6.4 pts | +7.2 pts |
College graduates are unusually common in Diamond Head-Kapahulu-St Louis: 49.5% 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. Since 2006–10, the share with a degree has risen 11.5 points, as it has nationally.
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 Head-Kapahulu-St Louis
| Period | Diamond Head-Kapahulu-St Louis | Honolulu area | Hawaii | U.S. |
|---|---|---|---|---|
| 2006–10 | 92.4% | 89.9% | 89.8% | 84.9% |
| 2010–14 | 94.2% | 90.5% | 90.6% | 86.1% |
| 2015–19 | 94.3% | 91.8% | 91.9% | 87.7% |
| 2020–24 | 93.3% | 93.0% | 93.1% | 89.3% |
| Change | +0.9 pts | +3.1 pts | +3.3 pts | +4.3 pts |
High school completion in Diamond Head-Kapahulu-St Louis is above the national rate: 93.3% of adults have a diploma, against 89.3%. The Honolulu area as a whole looks much the same. The share with a diploma is up 0.9 points from 2006–10, a smaller shift than nationally.
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 Head-Kapahulu-St Louis
| Period | Diamond Head-Kapahulu-St Louis | Honolulu area | Hawaii | U.S. |
|---|---|---|---|---|
| 2006–10 | 2.9% | 5.5% | 6.0% | 8.1% |
| 2010–14 | 4.2% | 6.3% | 6.9% | 9.4% |
| 2015–19 | 2.1% | 4.2% | 4.5% | 5.6% |
| 2020–24 | 4.4% | 4.7% | 5.0% | 5.4% |
| Change | +1.5 pts | −0.7 pts | −1.0 pts | −2.7 pts |
Unemployment in Diamond Head-Kapahulu-St Louis runs below the national rate: 4.4% of the labor force was out of work and looking, against 5.4% nationally. Unemployment is up 1.5 points from 2006–10, even as the national rate fell. 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 Head-Kapahulu-St Louis compared with nearby neighborhoods
| Neighborhood | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| Diamond Head-Kapahulu-St Louis | 2.46 | 46.2 | 6.4% | 50.1% | 14.4% | 1968 | $2,135 | 49.5% | 93.3% | 4.4% |
| Kaimuki | 2.96 | 47.1 | 8.9% | 34.4% | 7.3% | 1962 | $2,292 | 49.9% | 94.4% | 3.6% |
| Waikiki | 1.64 | 49.5 | 2.6% | 60.1% | 29.5% | 1974 | $1,993 | 45.0% | 94.3% | 6.6% |
| Mxcully-Moiliili | 1.99 | 44.4 | 5.5% | 63.7% | 11.3% | 1973 | $1,628 | 40.1% | 89.9% | 3.5% |
| Palolo | 3.01 | 45.9 | 6.5% | 33.6% | 5.0% | 1963 | $1,840 | 36.8% | 88.6% | 3.1% |
| Manoa | 2.45 | 43.9 | 8.3% | 37.5% | 7.0% | 1966 | $2,244 | 60.3% | 98.2% | 4.9% |
| Waialae-Kahala | 2.81 | 50.5 | 6.7% | 21.5% | 15.9% | 1965 | $2,683 | 62.6% | 97.9% | 2.7% |
| Makiki | 2.03 | 44.5 | 10.5% | 55.1% | 9.0% | 1973 | $1,822 | 46.3% | 91.3% | 6.4% |
| Ala Moana-Kakaako | 1.85 | 45.6 | 5.5% | 47.1% | 16.5% | 2000 | $2,203 | 53.0% | 95.9% | 4.2% |
| Nuuanu-Punchbowl | 2.68 | 43.5 | 8.6% | 37.9% | 10.6% | 1970 | $2,342 | 46.6% | 94.7% | 3.5% |
| Downtown | 1.66 | 46.4 | 4.7% | 63.3% | 13.3% | 1981 | $1,655 | 44.3% | 88.3% | 5.4% |
All figures 2020–24.
Neighborhoods with similar populations: Westside-Santa Barbara, Santa Barbara, CA · Northwest Dallas, Dallas, TX · Loop, Chicago, IL · Northwood, Irvine, CA · Outer Richmond, San Francisco, CA · Palos Verdes Peninsula, Torrance, CA · Rockdale, Atlanta, GA · Haddington-Carroll Park, Philadelphia, PA · Roseway, Portland, OR · Golden Glades-The Woods, Jacksonville, FL
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 Head-Kapahulu-St Louis. 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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