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Datacenter Sites in Williamson County, Illinois

Williamson County has 60 scored datacenter candidate sites averaging 53.8/100 DC Readiness, with a catalogued aggregate of 700 MW. FEMA rates local natural-hazard risk as "Relatively High". The county has a datacenter tax incentive on record.

At a glance

Williamson County, Illinois has 60 scored datacenter candidate sites averaging 53.8/100 DC Readiness, roughly in line with the Illinois average of 53.6. It ranks 14th of 101 Illinois counties by number of sites and 62nd by average score. The top-scoring site is EC Coal Williamson County · d5bd3cf7 at 59.9/100.

60
Candidate sites
53.8/100
Avg DC Readiness
700 MW
Catalogued capacity
theoretical aggregate
Relatively High
Hazard rating
◆ Loading map…
≥ 7560–7540–60≤ 40
Top 25 in Williamson County

Site-selection context for Williamson County

Yessales_tax_exemption
Datacenter tax incentive
9.94¢/kWh
Commercial electricity
4.45¢/kWh
Industrial electricity
7
Fiber providers
Low
Water stress
$4,701
Land price / acre
1,100
Cooling degree days
5,600
Heating degree days
52°F
Mean annual temp

Incentive detail: Enterprise Zone sales tax exemption; High Impact Business designation for $12M+ DC investments.

How does Williamson County compare with other counties in Illinois?

By number of scored sites, Williamson County ranks 14th of the 101 Illinois counties with a county page, holding 1.6% of the state's 3,641 sites. Its average DC Readiness of 53.8/100 ranks 62nd in the state and is roughly in line with the national average of 53.0. Nationally it has the 623rd-largest site inventory of 2,964 counties with five or more sites. 0 sites score 70 or higher and 25 score 55 or higher.

What types of datacenter sites are in Williamson County?

Former Mine sites are the most common (24, 40% of the county's inventory), followed by greenfield (22) and substation-adjacent (6). 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 Williamson County?

Industrial electricity averages 4.45¢/kWh and commercial 9.94¢/kWh. FEMA's National Risk Index rates the county "Relatively High" (35). WRI water stress is low. 7 fiber providers report service in the county. The climate runs 1,100 cooling degree days a year with a mean temperature of 52°F. Land is valued around $4,701 an acre.

By site type

Top datacenter sites in Williamson County

Top datacenter sites in Williamson County
SiteTypeVoltageCapacityQueue waitScore
EC Coal Williamson CountyGreenfield——4.8 yrs59.9
EC FFE Williamson CountyGreenfield——4.8 yrs59.8
EC Coal Williamson CountyGreenfield——4.8 yrs59.5
UNKNOWN121872Substation-Adjacent161 kV100 MW4.8 yrs59.3
OZ WilliamsonGreenfield——4.8 yrs59.1
EC Near MarionGreenfield——4.8 yrs59.0
EC Coal Williamson CountyGreenfield——4.8 yrs58.9
EC Coal Williamson CountyGreenfield——4.8 yrs58.3
EC Near MarionGreenfield——4.8 yrs58.1
MARION SSubstation-Adjacent161 kV100 MW4.8 yrs57.7
EC Coal Williamson CountyGreenfield——4.8 yrs57.5
EC Coal Williamson CountyGreenfield——4.8 yrs57.3
HERRINSubstation-Adjacent138 kV100 MW4.8 yrs57.3
MARION NSubstation-Adjacent138 kV100 MW4.8 yrs57.2
EC Near MarionGreenfield——4.8 yrs57.1
UNKNOWN122133Substation-Adjacent138 kV100 MW4.8 yrs57.1
CRAB ORCHARDSubstation-Adjacent138 kV100 MW4.8 yrs57.0
EC Near MarionGreenfield——4.8 yrs56.9
EC Near MarionGreenfield——4.8 yrs56.8
EC Near MarionGreenfield——4.8 yrs56.7
EC Coal Williamson CountyGreenfield——4.8 yrs56.7
EC Near MarionGreenfield——4.8 yrs56.6
EC Coal Williamson CountyGreenfield——4.8 yrs56.5
EC Near MarionGreenfield——4.8 yrs56.2
EC Near MarionGreenfield——4.8 yrs55.0

Every scored site in Williamson County

All 60 sites, best first.

Williamson County datacenter FAQ

How many datacenter sites are in Williamson County?

60 scored datacenter candidate sites, averaging 53.8/100 DC Readiness. That is the 14th-most of 101 Illinois counties with five or more sites.

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

EC Coal Williamson County · d5bd3cf7 scores 59.9/100 DC Readiness, the highest of the 60 scored sites in Williamson County (a greenfield site).

Does Williamson County offer datacenter tax incentives?

Enterprise Zone sales tax exemption; High Impact Business designation for $12M+ DC investments.

What is the natural-hazard risk in Williamson County?

FEMA's National Risk Index rates Williamson County as "Relatively High" (score 35).

What are industrial electricity rates in Williamson County?

Average industrial electricity is 4.45¢/kWh and commercial is 9.94¢/kWh in Williamson County.

More in Illinois

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 Williamson County, Illinois”, https://gridcensus.com/datacenter-sites/illinois/williamson-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 Williamson County, Illinois 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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