City in King County, Washington · 6.6 sq mi · 1,128 people per sq mi
About 7,400 people live in Black Diamond. The typical household earns $141,383, and the median resident is 38.1 years old.
2026 projection
From 4,846 in 2020
Poverty rate 2.1%
Men 39.8 · Women 34.9
1890–2026
7,446
2026 projection
53.7% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
1890–2026
7,446
2026 projection
53.7% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 7,446 | +468 | 6.71% |
|---|---|---|---|
| 2025 | 6,978 | +260 | 3.87% |
| 2024 | 6,718 | +274 | 4.25% |
| 2023 | 6,444 | +323 | 5.28% |
| 2022 | 6,121 | +545 | 9.77% |
| 2021 | 5,576 | +730 | 15.06% |
| 2020 | 4,846 | +61 | 1.27% |
| 2019 | 4,785 | +341 | 7.67% |
| 2018 | 4,444 | -4 | 0.09% |
| 2017 | 4,448 | +18 | 0.41% |
Showing 10 of 23 years.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 60 people).
Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
About 1 in 48 residents
61% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 61% | 58% | 65% |
| Never married | 26% | 30% | 22% |
| Divorced | 7% | 7% | 8% |
| Widowed | 4% | 3% | 5% |
| Separated | 2% | 3% | 0% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
10 sources, all from the U.S. Census Bureau