Population 6,652 · Census ACS 2020–24
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Population and households in Black Diamond
Household size in Black Diamond
| Period | Black Diamond | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | 2.87 | 2.52 | 2.56 | 2.68 |
| 2010–14 | 2.49 | 2.59 | 2.62 | 2.73 |
| 2015–19 | 2.59 | 2.62 | 2.62 | 2.71 |
| 2020–24 | 2.66 | 2.60 | 2.61 | 2.65 |
| Change | −0.21 | +0.09 | +0.05 | −0.03 |
At 2.66 people per household, Black Diamond sits close to the national average of 2.65. Household size has dropped from 2.87 in 2006–10, a much bigger shift than nationally. The biggest households, usually families with children, are concentrated in the center.
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 Black Diamond
| Period | Black Diamond | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | 37.6 | 37.5 | 38.0 | 37.7 |
| 2010–14 | 42.7 | 38.1 | 38.7 | 38.6 |
| 2015–19 | 44.1 | 38.5 | 39.3 | 39.6 |
| 2020–24 | 37.7 | 38.8 | 39.6 | 40.1 |
| Change | +0.1 | +1.3 | +1.6 | +2.3 |
The median resident of Black Diamond is 37.7 years old, a few years younger than the national median of 40.1. That is in line with the rest of the Seattle area. Residents skew youngest in the southeast and oldest in the northwest.
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 Black Diamond
| Period | Black Diamond | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | 9.3% | 10.3% | 10.9% | 12.3% |
| 2010–14 | 8.3% | 10.0% | 10.6% | 12.3% |
| 2015–19 | 9.4% | 9.2% | 10.1% | 11.6% |
| 2020–24 | 6.8% | 9.1% | 10.1% | 11.6% |
| Change | −2.5 pts | −1.2 pts | −0.8 pts | −0.6 pts |
Single-parent households are relatively rare in Black Diamond: 6.8% of households, against 11.6% nationally. The single-parent share is down 2.5 points from 2006–10, a much bigger shift than nationally.
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 Black Diamond
Renters in Black Diamond
| Period | Black Diamond | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | 8.2% | 37.7% | 35.2% | 33.3% |
| 2010–14 | 12.2% | 40.0% | 37.3% | 35.6% |
| 2015–19 | 14.6% | 39.9% | 37.0% | 36.0% |
| 2020–24 | 14.3% | 40.0% | 36.2% | 34.8% |
| Change | +6.1 pts | +2.3 pts | +1.0 pts | +1.5 pts |
Black Diamond is overwhelmingly a place of homeowners: only 14.3% of households rent, far below the national share of 34.8%. Owner-heavy areas like this tend to see less turnover. About one in five owners (20.0%) have paid off their mortgages, well below the national share of 39.8%. The renter share is up 6.1 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 Black Diamond
| Period | Black Diamond | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | 10.8% | 7.9% | 9.2% | 11.4% |
| 2010–14 | 6.4% | 7.8% | 9.2% | 11.4% |
| 2015–19 | 5.6% | 6.8% | 8.2% | 11.1% |
| 2020–24 | 4.9% | 6.6% | 7.6% | 9.6% |
| Change | −5.9 pts | −1.3 pts | −1.6 pts | −1.8 pts |
Empty homes are scarce in Black Diamond: just 4.9% sit vacant, compared with 9.6% nationally, a sign of a tight housing market. Vacancy is down 5.9 points from 2006–10, a much bigger shift than nationally.
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 Black Diamond
| Period | Black Diamond | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | 1986 | 1977 | 1977 | 1974 |
| 2010–14 | 1986 | 1978 | 1979 | 1975 |
| 2015–19 | 1979 | 1980 | 1980 | 1977 |
| 2020–24 | 2006 | 1983 | 1984 | 1980 |
| Change | +20 | +7 | +6 | +6 |
Black Diamond has newer housing than the country as a whole: the median home was built in 2006, versus 1980 nationally. The median year built has moved up from 1986 in 2006–10, a sign of steady new building. Newer construction is concentrated in the southeast, while the west has the oldest housing. Only one other Washington city with 5,000+ people has newer homes.
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 Black Diamond
| Period | Black Diamond | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | $883 | $1,162 | $1,018 | $965 |
| 2010–14 | $1,165 | $1,284 | $1,127 | $1,040 |
| 2015–19 | $1,595 | $1,644 | $1,390 | $1,213 |
| 2020–24 | $2,052 | $2,193 | $1,875 | $1,571 |
| Change | +$1,169 | +$1,031 | +$858 | +$606 |
The median renter in Black Diamond pays $2,052 a month for rent and utilities, well above the national median of $1,571. Still, rents here are lower than in the Seattle area as a whole ($2,193). Rent has climbed $1,169 a month since 2006–10, up 132%, faster than rents rose nationally. Rent takes 28.0% of the typical renter's income, just under the 30% mark often used to define affordable rent.
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 Black Diamond
Bachelor's degrees in Black Diamond
| Period | Black Diamond | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | 25.9% | 36.7% | 31.0% | 28.4% |
| 2010–14 | 28.4% | 38.0% | 32.1% | 29.6% |
| 2015–19 | 39.8% | 42.3% | 35.5% | 32.1% |
| 2020–24 | 52.0% | 46.3% | 38.8% | 35.6% |
| Change | +26.1 pts | +9.6 pts | +7.8 pts | +7.2 pts |
Black Diamond is highly educated: just over half of adults 25 and older (52.0%) hold at least a bachelor's degree, far above the national share of 35.6%. The share with a degree has risen 26.1 points since 2006–10, a much bigger shift than nationally. College graduates are most concentrated in the northeast and least in the west.
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 Black Diamond
| Period | Black Diamond | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | 95.1% | 91.3% | 89.5% | 84.9% |
| 2010–14 | 91.7% | 91.6% | 90.0% | 86.1% |
| 2015–19 | 96.7% | 92.5% | 91.0% | 87.7% |
| 2020–24 | 96.9% | 93.1% | 91.9% | 89.3% |
| Change | +1.8 pts | +1.8 pts | +2.4 pts | +4.3 pts |
High school completion is high in Black Diamond: 96.9% of adults 25 and older have a diploma or equivalent, well above the national rate of 89.3%. The share with a diploma is up 1.8 points from 2006–10, as it has nationally. Black Diamond has a higher share of high school graduates than at least four in five Washington cities.
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 Black Diamond
| Period | Black Diamond | Seattle area | Washington | U.S. |
|---|---|---|---|---|
| 2006–10 | 6.3% | 6.9% | 7.6% | 8.1% |
| 2010–14 | 5.6% | 8.3% | 8.9% | 9.4% |
| 2015–19 | 3.3% | 4.5% | 5.1% | 5.6% |
| 2020–24 | 1.1% | 5.0% | 5.1% | 5.4% |
| Change | −5.2 pts | −2.0 pts | −2.5 pts | −2.7 pts |
Unemployment in Black Diamond has been low: just 1.1% of the labor force was out of work and looking, well below the national rate of 5.4%. Only one other Washington city with 5,000+ people has lower unemployment. Unemployment is down 5.2 points from 2006–10, as it has nationally.
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).
Black Diamond 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Black Diamond | 2.66 | 37.7 | 6.8% | 14.3% | 4.9% | 2006 | $2,052 | 52.0% | 96.9% | 1.1% |
| Kummer | 2.66 | 35.3 | 4.7% | 16.8% | 7.1% | 2014 | $2,304 | 50.3% | 96.0% | 0.9% |
| Maple Valley | 3.07 | 37.4 | 9.7% | 15.9% | 4.3% | 1998 | $2,447 | 48.7% | 96.3% | 4.2% |
| Lake Morton-Berrydale | 2.97 | 39.9 | 8.6% | 14.0% | 2.8% | 1986 | $2,151 | 35.5% | 92.9% | 3.7% |
| Ravensdale | 3.06 | 40.5 | 4.3% | 11.4% | 4.1% | 1996 | $1,729 | 44.9% | 91.5% | 2.8% |
| Kanaskat | 2.88 | 37.8 | 4.5% | 13.9% | 6.2% | 2004 | $1,898 | 45.1% | 92.6% | 1.6% |
| Wabash | 3.14 | 32.1 | 11.6% | 11.0% | 11.7% | 1974 | $1,682 | 15.5% | 92.4% | 10.3% |
| Covington | 3.03 | 36.8 | 11.2% | 18.4% | 6.2% | 1994 | $2,345 | 36.5% | 94.6% | 3.9% |
| Cumberland | 2.97 | 47.1 | 6.5% | 0.4% | 2.2% | 1979 | $1,799 | 31.5% | 96.2% | 4.3% |
| Hobart | 2.72 | 47.1 | 4.3% | 6.8% | 2.4% | 1986 | $2,477 | 46.1% | 96.0% | 1.6% |
| Kangley | 2.74 | 45.0 | 2.5% | 6.6% | 5.1% | 1989 | $1,386 | 30.6% | 93.7% | 2.7% |
All figures 2020–24.
Cities with similar populations: Evans City, PA · Enfield, NC · Englewood Cliffs, NJ · Sisseton, SD · Lexington, MO · Onalaska, TX · Leslie, MI · Orange Grove, TX · Simpsonville, KY · Oregon, IL
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 Black Diamond. 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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