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Data centers in Union County, Ohio: 3 projects mapped
Union County has three Amazon Web Services data centers under construction in Jerome Township and Marysville, and a developer is now fighting to add two more nearby. Civil Solutions, a Cincinnati firm, filed in April for two campuses on about 215 acres in Jerome Township, on either side of the existing AWS site. The township's zoning inspector rejected both filings on September 3, and Civil Solutions has appealed to the Board of Zoning Appeals for December 17.
The existing AWS sites have taken a toll on emergency services: fire crews responded 84 times between 2021 and 2025, including two worker deaths and an April 2025 fire that burned for 30 hours and caused $50 million in damage, the Columbus Dispatch found. Crews were sometimes stopped by site security and made to wait outside for up to an hour; Amazon said it and its contractors added safety measures and blamed the delays on contractors' differing background-check rules.
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Jerome Township trustees passed a moratorium on data center permits, but the zoning inspector kept approving them anyway, including two filed before the pause; residents packed a February 2026 meeting to object. On March 17 trustees voted to make data centers a conditional use, so each new application now has to be argued for individually.
In Marysville, the city council gave AWS a 30-year, 100 percent property tax exemption on March 10, 2025 for its two-building, 500,000-square-foot Project Cosmo campus, a $1 billion commitment. In exchange, AWS agreed to payments totaling about $15.6 million over 15 years, split between the city and the Marysville Exempted Village School District.
Plain City, which straddles the Union and Madison county line, adopted a six-month moratorium on new data center permits in August 2026, covering the village but not the unincorporated county around it. Union County Commissioner Tom McCarthy said in August that with opposition now close to universal, the balance may be shifting toward the communities.
Data center projects on record in Union County
Grouped by the town each site sits in. The report above may name projects that have no record here yet.
Jerome Township1
| Project | Company | Status | Power | |
|---|---|---|---|---|
| AWS Warner Road (Union County)Jerome Township | Amazon Web Services | Under construction | Not reported |
Marysville1
| Project | Company | Status | Power | |
|---|---|---|---|---|
| AWS MarysvilleMarysville | Amazon Web Services | Under construction | Not reported |
Plain City1
| Project | Company | Status | Power | |
|---|---|---|---|---|
| AWS Jerome Township (Industrial Parkway)Plain City | Amazon Web Services | Under construction | Not reported |
Where this comes from
The reporting above was written from these. Open one and check it yourself.
Every project above is drawn from public records, filings and local reporting. Each row links to what it is based on. Statuses change, so check the source date before you rely on one. Found something wrong? Write to [email protected] and it gets fixed.