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Data Center Registry

AWS Project Cosmos

Marysville, Union County, Ohio · All 54 Amazon Web Services sites · Every Amazon case on our tracker

Under constructionNo reception on recordAI mixed useRecord updated July 6, 2026

AWS Project Cosmos is a data center under construction in Marysville, Ohio (Union County), operated by Amazon Web Services. The public record puts it at announced October 2024, 55 acres, a reported $1 billion investment.

Every line on this page traces to a public source listed at the bottom. Where a figure was looked for and not found, the row says so. A blank is never a zero.

Facility record

Under construction

Operator
Amazon Web Services
Facility type
Data center, AI use mixed
Location
Marysville, Union County, OH
Coordinates
40.2370, -83.3500
Power capacity
Not established from a public source
Land
55 acres
Investment
$1 billion
Announced
October 2024
Utility
Grid (city water supply; non-contact cooling with on-site storage)
Power source
Grid
Cooling
Not established from a public source
Water use
Not established from a public source
Jobs
50 permanent
Public subsidy
30-year 100% property tax exemption (Community Reinvestment Area), Marysville, Union County, OH, 2025
Community reception
No reception on record
Source confidence
Confirmed by multiple independent sources or official documentation

Timeline from the record

Newest first. Record entries come from the filings and reports the registry cites. Coverage entries are headlines from publisher feeds we monitor daily, linked to the outlet; last checked September 14, 2026.

  1. January 2026
    Under construction
    City of Marysville FAQ confirms site readiness activities began early 2026 with construction running through 2027; DCD had projected August 2025 construction start from permit approval which appears to have been delayed. Two buildings (~250,000 sq ft each); completion targeted 2027. Source: City of Marysville
  2. March 2025
    Permitted
    Marysville City Council approves Community Reinvestment Area agreement; 30-year 100% property tax exemption granted; permit issued March 10, 2025 Source: Data Center Dynamics
  3. October 2024
    Proposed
    AWS files rezoning application for Marysville Innovation Park at 14684 Industrial Parkway Source: Data Center Dynamics

Opposition and litigation at this site

Nothing on record as of July 6, 2026. No lawsuit, organized opposition, or contested hearing over AWS Project Cosmos in Marysville, Union County, Ohio appears in the sources this registry tracks. That is an absence in our sources rather than a finding that none exists, and local opposition often predates any coverage a national dataset would pick up.

If you live near this site and something is happening that this page does not show, that is worth telling us. Send us the document and it goes in the record with the source attached. For sites where opposition is already established, see every contested site we track.

Power and water

Non-contact cooling; on-site water storage used during off-peak hours; city water supply only (no on-site wells)

Public money on the record

ProgramAmountGranted byYear
30-year 100% property tax exemption (Community Reinvestment Area)Not establishedMarysville, Union County, OH2025

Notes on the record

14684 Industrial Parkway, Marysville OH 43040 (Union County, ~30 mi NW of Columbus). Two-building campus totaling ~500,000 sq ft on 55 acres. Also referenced as 'Project Cosmo' (without trailing 's') in DCD. Jobs updated to 50 per Marysville city FAQ ('at least 50 full-time operational jobs'); original record stated 25 from DCD/Amazon initial filing. Construction start updated to early 2026 per city FAQ; DCD had projected August 2025 which appears delayed. Part of AWS's broader $10B+ Ohio infrastructure commitment. Coordinates are approximate Marysville Innovation Park area.

What the record does not establish, and the document that would

In every fight on our tracker the decisive fact came out of a public records request. These are the requests for this site.

  • Power capacity in megawatts
  • Cooling method and water use
  • How the community has received it
Which document closes each gap
Power capacity in megawatts
The utility's large load service agreement, the interconnection request in the grid operator's queue, or the electrical site plan in the permit file.
Cooling method and water use
The water service agreement, any groundwater appropriation permit, and the mechanical narrative in the site plan.
How the community has received it
Planning commission and governing body minutes, public comment records, and any petition or lawsuit filed in the county.

Have one of these documents? Send it to us and we will add it to the record with attribution.

Other sites within 30 miles

Distances are between recorded coordinates, many of which are a city or county centroid, so treat them as approximate. Cumulative load on one utility and one aquifer is the question a planning commission rarely asks.

Questions people ask about this site

Is there opposition to the AWS Project Cosmos data center in Marysville?

Nothing on record as of July 6, 2026. No lawsuit, organized opposition, or contested hearing over AWS Project Cosmos in Marysville, Union County, Ohio appears in the sources this registry tracks. That is an absence in our sources rather than a finding that none exists, and local opposition often predates any coverage a national dataset would pick up.

Has anyone filed a lawsuit over the AWS Project Cosmos data center?

No lawsuit over AWS Project Cosmos appears in the record we track as of July 6, 2026. Residents most often reach a lawyer over water supply, well drawdown, noise from cooling plant, property value, or a rezoning approved without the notice the ordinance required. If any of that is happening near this site, it is worth a review whether or not a case has been filed yet.

How much water does AWS Project Cosmos use?

No water withdrawal figure for AWS Project Cosmos is on record here. Water use is rarely published voluntarily; it usually surfaces through a utility service agreement or a state withdrawal permit, both of which are public records. We leave the number blank rather than estimate one.

Who operates AWS Project Cosmos, and how big is it?

Amazon Web Services is the operator on record. We hold 54 sites for that company across the registry. No capacity figure is on record for this site. The site is recorded at 55 acres.

How to cite this page

SueDataCenters.org Data Center Registry, "AWS Project Cosmos," updated July 6, 2026, https://suedatacenters.org/data-centers/aws-project-cosmos-marysville-oh.

Facility data from Compute Atlas (E. Kubiak), version 1.32.0 (September 7, 2026), licensed CC BY 4.0, record https://www.compute-atlas.com/facilities/aws-project-cosmos-marysville-oh, retrieved September 14, 2026.

Corrections with a public source are welcome at the Compute Atlas record or through our contact page. The whole registry is available as CSV and JSON under CC BY 4.0.

Sources for this record

As compiled and cited by Compute Atlas, with our own reporting appended. Archived links are used where the original has moved.

  1. 1.AWS gets go-ahead for data center campus in Marysville, Ohio · Data Center Dynamics · retrieved July 6, 2026
  2. 2.Amazon Web Services Press Release - Grow Union County Ohio · Grow Union County Ohio / AWS · retrieved July 6, 2026
  3. 3.Data Center FAQs - City of Marysville, OH · City of Marysville · retrieved July 6, 2026

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