What is the population of Black Diamond city?

Black Diamond city has 5,678 residents on Census ACS 2019-2023 ACS 5-year estimates, ranking #187 of 639 in Washington.

What is the median household income in Black Diamond city?

Median household income in Black Diamond city is $144,728 a year, 84.3% above the national figure of $78,538.

How much does it cost to rent or buy in Black Diamond city?

Median gross rent is $2,340 a month and the median home value is $776,400, so rent absorbs about 19.4% of median household income.

Is Black Diamond city affordable compared with the rest of the US?

Homes cost about 5.4× the local median income here versus roughly 3.9× nationally, so Black Diamond city is less affordable to buy in than the typical US market, and rent takes 19.4% of median income against the 30% cost-burden line.

Aerial view of a dense city center, illustrating the US cities ZIP code directory

Washington · Census place 06330

Black Diamond, WA population, income and ZIP codes

Quick answer

The population of the city of Black Diamond, Washington (Black Diamond, WA — Census place “Black Diamond city”) is 5,678 residents, ranking #187 of 639 places in Washington. Median household income is $144,728, the median home is worth $776,400 and median gross rent runs $2,340 a month. Looking for the Black Diamond Washington ZIP code list? 1 ZIP codes serve Black Diamond, WA: 98010.

Population: 5,678Black Diamond city residents
Median household income: $144,728Past 12 months, inflation adjusted
Median home value: $776,400Owner-occupied units
Median gross rent: $2,340Rent plus utilities, monthly
Median age: 38.1 yrsAll residents
Homeownership rate: 87%Owner-occupied households

Black Diamond ZIP codes (Washington)

Census ZCTAs whose delivery area overlaps Black Diamond.

The Black Diamond WA ZIP code list below covers 1 ZIP code. Open any one for its population, income, housing and rent profile.

98010

What the numbers mean in Black Diamond city

Housing cost measured against local earnings.

A household earning the Black Diamond city median would spend about 19.4% of gross income on the median rent. The 30% mark is the federal threshold for cost burden, so anything above it signals a stretched rental market. The median home costs 5.4× the median household income; nationally that ratio sits near 4.5×. Poverty affects 1.1% of residents and 87% of households own their home.

Source: US Census Bureau, ACS 2019-2023 5-year estimates · rates as published for 2019-2023 ACS 5-year

Black Diamond city, WA in context

How this area compares with national benchmarks.

Black Diamond city is a mid-size town in Washington, with 5,678 residents counted in the Census American Community Survey 2019-2023 ACS 5-year estimates, which places it #187 of 639 ranked by population — larger than 70% of them. The median age here is 38.1 years against 39.1 nationally, a slightly younger profile than the country as a whole. Places under 65,000 residents only appear in the five-year release, never the one-year file, so these values pool sixty months of responses and lag the current year by design.

Households in Black Diamond city earn a median of $144,728 a year, 84.3% above the national figure of $78,538 and 60% above the $90,592 median for the 393 Washington cities we cover. The median is the midpoint household, not an average, so a handful of very high earners cannot drag it upward the way they distort a mean. Poverty reaches 1.1% of residents here, less than half the 12.4% national rate.

The typical owner-occupied home in Black Diamond city is valued at $776,400, 155.9% above the national figure and 66% above the $468,400 peer median, while median gross rent runs $2,340 a month, 66.4% above the national figure, or roughly $28,080 across a full year. A household on the local median income would put about 19.4% of gross pay toward that rent against the federal 30% cost-burden threshold, so renting here is cheap relative to what people here earn. The home-price-to-income ratio works out to 5.4×, against roughly 3.9× nationally, so buying is harder here than in the average US market. 87% of occupied homes are owner-occupied versus 65% nationally, an owner-dominated market where rental listings are scarce and rent medians rest on a thin sample. Rent is reported gross — contract rent plus tenant-paid utilities — which is why it runs above the advertised price on a listing for the same unit.

All values below were released by the Census for this exact geography, with no gap-filling on our side. Small-area estimates still carry wider margins of error than state or national figures, so check the linked ACS tables before relying on them for lending, appraisal or legal work.

Compare with nearby places

Places of similar size in Washington.

More Washington coverage.

Frequently asked questions

Common questions about this area.

What is the population of Black Diamond city?: Black Diamond city has 5,678 residents on Census ACS 2019-2023 ACS 5-year estimates, ranking #187 of 639 in Washington.
What is the median household income in Black Diamond city?: Median household income in Black Diamond city is $144,728 a year, 84.3% above the national figure of $78,538.
How much does it cost to rent or buy in Black Diamond city?: Median gross rent is $2,340 a month and the median home value is $776,400, so rent absorbs about 19.4% of median household income.
Is Black Diamond city affordable compared with the rest of the US?: Homes cost about 5.4× the local median income here versus roughly 3.9× nationally, so Black Diamond city is less affordable to buy in than the typical US market, and rent takes 19.4% of median income against the 30% cost-burden line.
How current is this Black Diamond city data?: All figures come from the US Census Bureau American Community Survey 2019-2023 ACS 5-year five-year estimates. Places under 65,000 residents only appear in the five-year release, never the one-year file, so these values pool sixty months of responses and lag the current year by design.