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Datacenter Sites in King County, Washington

King County has 344 scored datacenter candidate sites averaging 56.1/100 DC Readiness, with a catalogued aggregate of 16,600 MW. FEMA rates local natural-hazard risk as "Relatively Moderate". The county has a datacenter tax incentive on record.

At a glance

King County, Washington has 344 scored datacenter candidate sites averaging 56.1/100 DC Readiness, roughly in line with the Washington average of 51.7. It ranks 4th of 39 Washington counties by number of sites and 8th by average score. The top-scoring site is MAPLE VALLEY at 68.4/100.

344
Candidate sites
56.1/100
Avg DC Readiness
16,600 MW
Catalogued capacity
theoretical aggregate
Relatively Moderate
Hazard rating
◆ Loading map…
≥ 7560–7540–60≤ 40
Top 25 in King County

Site-selection context for King County

Yessales_tax_exemption
Datacenter tax incentive
8.87¢/kWh
Commercial electricity
7.33¢/kWh
Industrial electricity
16
Fiber providers
Low-Medium
Water stress
$38,716
Land price / acre
300
Cooling degree days
5,000
Heating degree days
48°F
Mean annual temp

Incentive detail: Sales tax exemption on DC equipment and construction for eligible facilities; no state income tax.

How does King County compare with other counties in Washington?

By number of scored sites, King County ranks 4th of the 39 Washington counties with a county page, holding 5.7% of the state's 6,019 sites. Its average DC Readiness of 56.1/100 ranks 8th in the state and is roughly in line with the national average of 53.0. Nationally it has the 36th-largest site inventory of 2,964 counties with five or more sites. 0 sites score 70 or higher and 139 score 55 or higher.

What types of datacenter sites are in King County?

Industrial sites are the most common (183, 53% of the county's inventory), followed by substation-adjacent (111) and former mine (22). Site type reflects how the parcel was identified — next to a substation, on a former mine or brownfield, on industrial or federal excess land — and is scored on the same 14 factors either way.

What are power cost, hazard, water and fiber conditions in King County?

Industrial electricity averages 7.33¢/kWh and commercial 8.87¢/kWh. FEMA's National Risk Index rates the county "Relatively Moderate" (28). WRI water stress is low-medium. 16 fiber providers report service in the county. The climate runs 300 cooling degree days a year with a mean temperature of 48°F. Land is valued around $38,716 an acre.

By site type

Top datacenter sites in King County

Top datacenter sites in King County
SiteTypeVoltageCapacityQueue waitScore
MAPLE VALLEYSubstation-Adjacent500 kV1,000 MW3.5 yrs68.4
COVINGTONSubstation-Adjacent500 kV1,000 MW3.5 yrs68.2
ECHO LAKESubstation-Adjacent500 kV1,000 MW3.5 yrs67.4
RAVERSubstation-Adjacent500 kV1,000 MW3.5 yrs66.6
TAP206230Substation-Adjacent500 kV1,000 MW3.5 yrs66.3
OBRIENSubstation-Adjacent230 kV300 MW3.5 yrs65.2
OZ KingGreenfield——3.5 yrs64.6
SAMMAMISHSubstation-Adjacent230 kV300 MW3.5 yrs64.2
OZ KingGreenfield——3.5 yrs64.1
BERRYDALESubstation-Adjacent230 kV300 MW3.5 yrs63.8
KLAHANIESubstation-Adjacent230 kV300 MW3.5 yrs63.5
NOVELTY HILLSubstation-Adjacent230 kV300 MW3.5 yrs63.5
EC Coal King CountyGreenfield——3.5 yrs62.0
OZ KingGreenfield——3.5 yrs61.4
UNKNOWN202391Substation-Adjacent230 kV300 MW3.5 yrs61.2
OZ KingGreenfield——3.5 yrs61.1
UNKNOWN201899Substation-Adjacent115 kV100 MW3.5 yrs61.0
UNKNOWN201979Substation-Adjacent115 kV100 MW3.5 yrs60.9
UNKNOWN202951Substation-Adjacent115 kV100 MW3.5 yrs60.9
UNKNOWN202945Substation-Adjacent115 kV100 MW3.5 yrs60.9
UNKNOWN201898Substation-Adjacent115 kV100 MW3.5 yrs60.9
EC Coal King CountyGreenfield——3.5 yrs60.8
MIDLAKESubstation-Adjacent115 kV100 MW3.5 yrs60.8
TAP209053Substation-Adjacent115 kV100 MW3.5 yrs60.7
UNKNOWN201980Substation-Adjacent115 kV100 MW3.5 yrs60.7

Every scored site in King County

All 344 sites, best first.

King County datacenter FAQ

How many datacenter sites are in King County?

344 scored datacenter candidate sites, averaging 56.1/100 DC Readiness. That is the 4th-most of 39 Washington counties with five or more sites.

What is the highest-scoring datacenter site in King County?

MAPLE VALLEY scores 68.4/100 DC Readiness, the highest of the 344 scored sites in King County (a substation-adjacent site).

Does King County offer datacenter tax incentives?

Sales tax exemption on DC equipment and construction for eligible facilities; no state income tax.

What is the natural-hazard risk in King County?

FEMA's National Risk Index rates King County as "Relatively Moderate" (score 28).

What are industrial electricity rates in King County?

Average industrial electricity is 7.33¢/kWh and commercial is 8.87¢/kWh in King County.

More in Washington

About this data

Source: GridCensus composite of HIFLD transmission and substation data, EIA, FEMA National Risk Index, FCC broadband data, PeeringDB and ISO interconnection queues, as published November 12, 2026 — GridCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.

Cite as: GridCensus, “Datacenter candidate sites in King County, Washington”, https://gridcensus.com/datacenter-sites/washington/king-county (data as of November 12, 2026).

Dataset updated . Screening estimates derived from public data sources.

Go deeper than the public screen

Every site and score for King County, Washington is free to browse. Pro adds Watchtower on 25 sites, alerts when new candidate sites, datacenters or interconnection-queue requests appear in your markets, score and capacity history, and CSV export. Enterprise adds team seats, weekly data files for all 147,272 sites, the REST API and an MCP server for AI tools.

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