98010 ZIP Code — Black Diamond, WA

King County, Washington

ZIP code 98010 is located in Black Diamond, Washington, within King County. It covers approximately 14.92 square miles and serves a population of 6,128 residents. This is a standard ZIP code in the Pacific (PT) timezone, served by area code 360/564.

About ZIP code 98010

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1990s, giving the area an established character. Median home value is $787,200. Owner-occupancy is high at 87%, well above the national average.

The gap between median ($141,579) and mean household income suggests income inequality — a small number of higher earners pull the average up.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. An above-average commute of 37 minutes suggests many residents work outside the immediate area. Remote work is prevalent — 20% of workers work from home.

Educational attainment is high — 54% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 98010 reflects a community defined by a highly educated population, high homeownership, and a high rate of remote workers.

6,128

population

14.92

sq mi land

Standard

ZIP type

Pacific (PT)

timezone

98010 ZIP code map

Cities in ZIP code 98010

Below are the cities the US Postal Service accepts for ZIP code 98010. Using any city not on this list may result in mail delivery delays.

City	Status
Black Diamond	Acceptable
Black Diamond	Preferred

Nearby ZIP codes

98051 Ravensdale (4.7 mi) 98092 Auburn (5.6 mi) 98042 Kent (6.1 mi) 98038 Maple Valley (6.2 mi) 98002 Auburn (10 mi) 98030 Kent (10.1 mi) 98058 Renton (10.1 mi) 98031 Kent (11.7 mi) 98047 Pacific (12.4 mi) 98027 Issaquah (12.6 mi) 98001 Auburn (12.7 mi) 98391 Bonney Lake (12.9 mi)

Demographics updated 05/2026

Population
Total population	6,128
Population density	411 / sq mi
State FIPS	53
County FIPS	033

Geography
Land area	14.92 sq mi
Water area	1.00 sq mi
Latitude	47.3142
Longitude	-121.9950
Timezone	Pacific (PT)
Area code	360/564

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	15.5%	24.4%	31.7%
$50k – $100k	24.7%	25.9%	30.6%
$100k – $200k	40.6%	30.8%	27.1%
Over $200k	19.2%	18.9%	10.6%

Demographics & statistics

6,128

Population

411

People per sq mi

41.0

Median age

$141,579

Median household income

$67,391

Per capita income

$787,200

Median home value

$1,570

Median monthly rent

86.7%

Home ownership

0.8%

Poverty rate

0.9%

Unemployment

2,156

Housing units

54.3%

Bachelor's or higher

Age distribution

Male Female

230

Under 5

197

167

5–9

142

256

10–14

219

132

15–19

112

174

20–24

149

423

25–34

360

525

35–44

448

372

45–54

317

333

55–59

284

268

60–64

229

251

65–74

214

128

75–84

109

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	1,426	23.3%
18 and over	4,702	76.7%
65 and over	791	12.9%
Median age	41.0 years

Race & ethnicity

White 76.3%

Two or more races 7.6%

Hispanic or Latino 7.4%

Asian 5.5%

Other race 2.6%

Black or African American 0.6%

Group	Count	%
White	5,047	76.3%
Two or more races	504	7.6%
Hispanic or Latino	489	7.4%
Asian	365	5.5%
Other race	171	2.6%
Black or African American	41	0.6%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	15.5%	24.4%	31.7%
$50k – $100k	24.7%	25.9%	30.6%
$100k – $200k	40.6%	30.8%	27.1%
Over $200k	19.2%	18.9%	10.6%

Under $10k 1.4%

$15k–$25k 1.4%

$25k–$35k 2.1%

$35k–$50k 4.9%

$50k–$75k 5.0%

$75k–$100k 14.2%

$100k–$150k 26.0%

$150k–$200k 15.5%

$200k+ 29.5%

Range	% of households
Under $10k	1.4%
$15k–$25k	1.4%
$25k–$35k	2.1%
$35k–$50k	4.9%
$50k–$75k	5.0%
$75k–$100k	14.2%
$100k–$150k	26.0%
$150k–$200k	15.5%
$200k+	29.5%
Median income	$141,579

Housing

Home values

$100k–$150k 0.4%

$200k–$300k 2.0%

$300k–$500k 18.3%

$500k–$1M 51.0%

$1M+ 28.2%

Housing overview

Metric	Value
Median home value	$787,200
Median rent / month	$1,570
Owner occupied	86.7%
Renter occupied	13.3%
Vacant	3.9%
Single-family detached	94.0%
Large apartment buildings	0.0%
Mobile homes	5.0%
Median rooms	7.3
Avg household size (owned)	2.60

Year built

Era	%
2020 or later	7.9%
2010–2019	13.3%
2000–2009	13.6%
1990–1999	30.0%
1980–1989	5.1%
1970–1979	9.4%
1960–1969	7.1%
1950–1959	4.9%
1940–1949	0.8%
1939 or earlier	7.9%

Bedrooms

Size	% of units
No bedroom (studio)	1.0%
1 bedroom	0.8%
2 bedrooms	11.4%
3 bedrooms	40.7%
4 bedrooms	34.3%
5+ bedrooms	11.8%

Vehicles per household

Vehicles	% of households
No vehicle	0.8%
1 vehicle	16.3%
2 vehicles	42.7%
3 or more	40.2%

Heating fuel

Fuel type	%
Utility gas	67.2%
Electricity	24.9%
Propane / LP gas	2.2%
Fuel oil	1.4%
Wood	3.4%

Households & families

Household type	Count	%
Married-couple family	1,445	60.9%
Cohabiting couple	84	3.5%
Male householder, no spouse	476	20.1%
Female householder, no spouse	369	15.5%
Households with children under 18	780	32.9%
Households with seniors (65+)	525	22.1%
Average household size	2.58

Marital status

Status	Male	Female
Never married	24.6%	14.1%
Married	61.1%	66.7%
Separated	3.1%	0.0%
Widowed	1.2%	5.7%
Divorced	10.0%	13.5%

Education

Less than 9th grade 1.1%

Some HS, no diploma 0.2%

HS graduate 15.1%

Some college, no degree 19.2%

Associate's degree 10.1%

Bachelor's degree 36.3%

Graduate / professional 18.0%

Metric	%
HS diploma or higher	98.7%
Bachelor's or higher	54.3%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	102	8.1%
Kindergarten	29	2.3%
Elementary school	722	57.6%
High school	235	18.7%
College / grad school	166	13.2%

Employment

Industry of employment

Education & healthcare 23.3%

Professional & management 12.8%

Retail trade 12.3%

Construction 10.9%

Transportation & utilities 10.5%

Manufacturing 9.0%

Finance & real estate 6.9%

Public administration 4.9%

Arts, food & hospitality 4.5%

Wholesale trade 2.2%

Information 1.8%

Agriculture & mining 0.7%

Other services 0.3%

Occupation

Category	%
Management, business & arts	50.4%
Service	14.2%
Sales & office	17.2%
Natural resources & construction	9.6%
Production & transportation	8.6%

Employment type

Type	%
Private sector	75.0%
Government	18.4%
Self-employed	6.3%
Unpaid family workers	0.3%

Commute

Method	%
Drive alone	71.2%
Carpool	5.6%
Public transit	0.7%
Walk	1.0%
Work from home	20.1%
Other means	1.3%
Avg commute (minutes)	37.1

Poverty

All people 0.8%

Under 18 years 0.0%

18 and over 1.1%

Married-couple families 0.0%

Female-led households 0.0%

Income support

Source	% of households
Social Security	22.5%
Retirement income	23.1%
Supplemental Security	5.3%
Cash public assistance	8.2%
Food stamps / SNAP	4.5%

Health indicators

Condition	%
Obesity	22.7%
High blood pressure	26.5%
High cholesterol	30.7%
Diabetes	6.3%
Heart disease	4.4%
Stroke	2.1%
Asthma	9.7%
Arthritis	20.2%
Kidney disease	2.2%
Pulmonary disease	4.2%
Cancer	6.4%

Behavior / access	%
Smoking	11.1%
Binge drinking	20.6%
No physical activity	12.4%
Less than 7 hrs sleep	26.5%
Depression	25.8%
Fair or poor health	9.3%
Poor mental health	13.4%
Poor physical health	8.1%
No health insurance	8.3%
Visited doctor (checkup)	68.1%
Visited dentist	75.3%
Cholesterol screening	90.5%
Teeth loss	6.9%

Veterans & disability

Veterans	Count	%
Civilian veterans	494	10.5%

Disability	%
Any disability	10.2%
Under 18	3.2%
18–64 years	9.8%
65 and over	24.3%

Health insurance coverage

Type	%
Private insurance	83.7%
Public insurance	20.2%
No insurance	4.3%
Uninsured under 19	2.7%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	5,701	93.0%
Spanish	143	2.5%
Other Indo-European	131	2.3%
Asian & Pacific Islander	12	0.2%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	5,555	90.6%
Born in same state	5,546	90.5%
Born in different state	2,741	44.7%
Foreign born	9	0.1%
Naturalized citizen	573	9.4%
Not a US citizen	322	56.2%

Ancestry

Ancestry	Count	%
French	870	14.2%
Italian	819	13.4%
Polish	329	5.4%
Arab	262	4.3%

Ancestry	Count	%
English	128	2.1%
German	52	0.8%
Norwegian	8	0.1%

Technology access

Metric	% of households
Computer access	38.7%
Internet access	99.4%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 98010

What city is ZIP code 98010 in?

ZIP code 98010 is primarily assigned to Black Diamond, Washington.

What county is ZIP code 98010 in?

ZIP code 98010 falls within King County, Washington.

Is ZIP code 98010 mostly owner-occupied?

87% of occupied units in ZIP code 98010 are owner-occupied, well above the national average.

How educated is the population of ZIP code 98010?

54% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Does ZIP code 98010 have a large veteran population?

11% of civilians in ZIP code 98010 are veterans, above the national average of ~7%.

What is the median household income in ZIP code 98010?

The median household income in ZIP code 98010 is $141,579, above the national median of ~$75,000.

What timezone is ZIP code 98010 in?

ZIP code 98010 observes the PST timezone.