In August 2017, there were seven homes sold, with a median sale price of $540,000 - a 63.7% increase over the $329,950 median sale price for the same period of the previous year. There were four homes sold in Black Diamond in August 2016.
The median sales tax in Black Diamond for the most recent year with available data, 2016, was $3,492, approximately 0.6% of the median home sale price for August 2017.
The following table compares Black Diamond to other King County cities with similar median sales prices in August 2017:
| City | Aug. 2017 Home Sales | Aug. 2016 Home Sales | % change (Total Home Sales) | Aug. 2017 Median Sales Price | Aug. 2016 Median Sales Price | % change (Median Sales Price) |
|---|---|---|---|---|---|---|
| Snoqualmie | 6 | 27 | -77.8% | $619,250 | $611,000 | 1.4% |
| Kirkland (unincorporated) | 24 | 34 | -29.4% | $615,500 | $547,544 | 12.4% |
| Bothell (unincorporated) | 4 | 23 | -82.6% | $577,500 | $540,000 | 6.9% |
| Black Diamond (unincorporated) | 2 | 0 | - | $557,475 | $0 | - |
| Shoreline | 27 | 65 | -58.5% | $550,000 | $445,000 | 23.6% |
| Black Diamond | 7 | 4 | 75% | $540,000 | $329,950 | 63.7% |
| Milton | 1 | 0 | - | $512,000 | $0 | - |
| East Renton Highlands (unincorporated) | 32 | 100 | -68% | $510,000 | $414,975 | 22.9% |
| Renton (unincorporated) | 8 | 15 | -46.7% | $486,250 | $385,000 | 26.3% |
| Duvall | 8 | 9 | -11.1% | $474,500 | $599,000 | -20.8% |
| Maple Valley | 17 | 72 | -76.4% | $472,500 | $402,500 | 17.4% |
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