Data Centers in Wisconsin
Wisconsin has 37 data centers identified from primary sources across 13 counties, run by 28 operators, against an industry reference count of 53. Milwaukee County holds the largest cluster with 11. MISO runs the grid for all of the state. 1 state measure on record (failed) and 9 local pauses; 5 named projects delayed or blocked, and 4 capital atlas sites carrying $22B in announced commitments.
Where Wisconsin's data centers stand
Key facts
- Data centers identified
- 37 from the operators' own facility lists, PeeringDB, OpenStreetMap and Wikidata, of which 3 are mapped buildings that carry no name
- Target count
- 53 facilities in the industry reference count for Wisconsin; this map holds 39 of them (73.6 percent), 14 still to identify
- Largest cluster
- Milwaukee County with 11 facilities
- Largest operator
- Ethoplex with 3 facilities
- Grid operator
- MISO
- State measures
- 1 on record, strongest status failed
- Local pauses
- 9 city or county moratoria · 33 local restrictions on the delay watchlist
- Water measures
- 1 state and local, plus the federal measures that apply everywhere
Wisconsin data centers, in short
Wisconsin has 37 data centers identified from primary sources, spread across 17 cities and counties and run by 28 operators. The largest concentration is Madison, with 8 data centers, followed by Milwaukee with 8 and Mount Pleasant with 3.
The operators with the most data centers in Wisconsin are Ethoplex (3), Involta (2), ark data centers (2), Lumen (2), OneNeck IT Solutions (1). Colocation and interconnection providers appear most often because they publish building-level detail; hyperscale campuses appear where the operator or the county names the individual buildings.
Not every operator discloses size. In Wisconsin, 10 publish a floor area and 7 publish a power figure, and each figure is shown against the data center it belongs to rather than added into one number. They are not the same measurement: one operator states the floor area of a single building, another the full capacity of a campus it has only announced.
MISO runs the wholesale power market and the high-voltage grid for all of Wisconsin. 1 statewide measure governing data centers is on record, alongside 9 local pauses. 5 named projects in Wisconsin are delayed, blocked or under challenge, and the capital atlas records 4 sites here carrying $22B in announced commitments.
Wisconsin data centers by city
Every data center identified in Wisconsin, grouped by the city or county it stands in, 37 of them across 17 places. Each entry names the operator and links to the source that states it.
Data centers in Madison, Wisconsin
- 5Nines Data 5Nines Data / Network222 222 West Washington Avenue, Suite 170 6 networks
- EdgeConneX Madison (EDCMAD01) EdgeConneX 4916 E Broadway, Pod #1 7,800 sq ft0.7 MW4 networks
- Network 222 Fiore Companies 222 W Washington Ave. Ste. 1 3,500 sq ft0.15 MW13 networks
- 612 W Main Hoyos Consulting 612 W Main St. 2 networks
- Lumen Network Colocation market: Madison, WI Lumen
- SupraNet Communications Madison SupraNet Communications 8000 Excelsior Drive 2 networks
- University of Wisconsin-Madison University of Wisconsin-Madison 1210 W. Dayton Street 5 networks
- Data center building 2802 Sylvan Avenue
Data centers in Milwaukee, Wisconsin
- Milwaukee 2 Data Center Cogent 2915 South 5th Court 5,831 sq ft
- MIWI1 fifteenfortyseven Critical Systems Realty 1 MW
- Lumen Network Colocation market: Milwaukee, WI Lumen
- Data Holdings Milwaukee Stack41 3135 W Highland Blvd 2 networks
- TSR Solutions Data Center TSR Solutions 324 E Wisconsin Ave #825, Milwaukee, WI 53202 5 networks
- Vaultas Vaultas 1101 N Market Street
- MLUKWI Verizon Wireless 1234 Broadway, Milwaukee, WI
- 324 E Wisconsin Wells Interconnection 324 E Wisconsin Ave 160,000 sq ft1 MW7 networks
Data centers in Mount Pleasant, Wisconsin
- Racine County datacenter campus (Mount Pleasant) Microsoft
- Data center building
- Data center building
Data centers in Franklin, Wisconsin
- Expedient Milwaukee Expedient 4777 W Ironwood 27,000 sq ft1.6 MW
- CyberLynk MKE1 Wisconsin CyberLynk Network 10125 S 52nd St 1 networks
Data centers in Green Bay, Wisconsin
- ark data centers - Green Bay ark data centers 7,192 sq ft
- Green Bay Data Center Involta 7,192 sq ft
Data centers in Harrison, Wisconsin
- ark data centers data center ark data centers W6149 Old Highway Road Mailing address: Menasha 1 networks
- Involta data center Involta
Data centers in Port Washington, Wisconsin
- Port Washington, Wisconsin Data Center Oracle
- Port Washington (Lighthouse, WI1) Vantage 2,500,000 sq ft902 MW
Data centers in Beaver Dam, Wisconsin
- Beaver Dam Data Center Meta
Data centers in Fitchburg, Wisconsin
- US Signal WI02 - Madison OneNeck IT Solutions 5515 Nobel Drive 60,000 sq ft6 MW3 networks
Data centers in Germantown, Wisconsin
- Ethoplex Data Center Ethoplex N115W19150 Edison Dr 1 networks
Data centers in Marshfield, Wisconsin
- 901 Commerce Dr Marshfield Clinic 901 Commerce Dr, Marshfield, WI 54449
Data centers in Menomonie, Wisconsin
- West Wisconsin Telcom data center West Wisconsin Telcom 816 6th Avenue
Data centers in Oxford, Wisconsin
- Marquette-Adams Telephone Coop
Data centers in Pewaukee, Wisconsin
- Pewaukee Data Center WE Energies W237N1500 Busse Road Mailing address: Waukesha
Data centers in West Milwaukee, Wisconsin
- TierPoint Milwaukee TierPoint 3701 W. Burnham Street, Ste C Mailing address: Milwaukee 28,000 sq ft1 networks
Data centers in Unincorporated Brown County, Wisconsin
- Ethoplex Edge DC - Green Bay Ethoplex 4151 Heritage Rd Mailing address: De Pere 1 networks
Data centers in Unincorporated Fond du Lac County, Wisconsin
- Ethoplex Edge DC - Fond du Lac Ethoplex W6720 Subway Rd Mailing address: Friendship
Floor area and power appear only where the operator or a government record publishes them. A building the sources describe without naming it is listed as a data center building at its county.
Where they cluster, and who runs them
Facilities by county 13
Operators 28
Cities 15
The rules and the pipeline in Wisconsin
Wisconsin has 1 state measure on record (failed), 9 local pauses, and 1 state or local water measure. MISO runs the grid there. Each tracker below holds the full record for Wisconsin, with every entry sourced.
Wisconsin data centers, answered from the record
How many data centers are in Wisconsin?
The industry reference count for Wisconsin is 53 facilities. This map places 37 of them from primary sources, each with a source record you can open, and every entry names the operator, the county, and the grid operator that serves it. The rest are mostly small regional colocation providers and enterprise buildings that no public register describes.
Where are Wisconsin's data centers?
They are listed on this page city by city. By city: Madison (8), Milwaukee (8), Mount Pleasant (3), Green Bay (2). By county: Milwaukee County (11), Dane County (9), Brown County (3). Every data center identified in Wisconsin appears under the city or county it stands in, with its operator and the source that names it.
Who operates data centers in Wisconsin?
28 operators appear in the registers for Wisconsin. The largest by facility count: Ethoplex (3), Involta (2), ark data centers (2), Lumen (2), OneNeck IT Solutions (1). Interconnection-heavy providers are over-represented because PeeringDB records where networks meet; hyperscalers appear where contributors have mapped their buildings.
Does Wisconsin have a data center moratorium?
Wisconsin has 1 state measure on record: AB 1099 / SB 1061: Moratorium on operation of data centers (failed, Mar 2026). 9 city or county pauses are on record locally. The Wisconsin Data Center Moratorium Tracker carries each measure with its primary source and a weekly changelog.
Which grid operator serves Wisconsin data centers?
MISO runs the wholesale power market and the high-voltage transmission system for all of Wisconsin. Effectively the entire state is MISO (ATC transmission in east/central; Xcel NSP-W in west), not a genuine multi-RTO state.
Are new data centers being built or delayed in Wisconsin?
5 named projects in Wisconsin are delayed, blocked, or under challenge (1,000 MW disclosed), with 33 local restrictions, 2 jurisdictional actions, 9 utility dockets, and 0 flagged queue row or large-load studys. The capital atlas records 4 named sites in Wisconsin with $22B in announced commitments and 7 projects blocked, delayed, or halted ($47.6B disclosed).
Facility layer: PeeringDB (Acceptable Use Policy), OpenStreetMap (ODbL, © OpenStreetMap contributors), Wikidata (CC0), US Census Bureau boundaries. Tracker layers: the SAVRN Moratorium Tracker, Water Tracker, Grid Operator Watchlist, Delay Watchlist, and Capital Atlas, each primary-sourced. Method on the national map.
Wisconsin across the SAVRN trackers
The same state followed through the money, the policy, the water and the delays. Each page is primary-sourced and refreshed on its own schedule, and each links back here.