Data Center Registry

CyrusOne CIN3 (Cincinnati-Mason)

Mason, Warren County, Ohio · All 35 CyrusOne sites · Every CyrusOne case on our tracker

OperatingNo reception on recordRecord updated October 14, 2026

CyrusOne CIN3 (Cincinnati-Mason) is an operating data center in Mason, Ohio (Warren County), operated by CyrusOne. The public record puts it at 1 MW operating.

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

Operating

Operator: CyrusOne
Facility type: Data center
Location: 4800 Parkway Dr, Suite 100, Mason, Warren County, OH, 45040
Coordinates: 39.3039, -84.3116
Power capacity: 1 MW operating
Land: Not established from a public source
Investment: Not established from a public source
Announced: Not established from a public source
Utility: Duke Energy Ohio
Cooling: Not established from a public source
Water use: Not established from a public source
Jobs: Not established from a public source
Public subsidy: Not established from a public source
Community reception: No reception on record
Source confidence: Reported by at least one credible outlet or filing

Opposition and litigation at this site

Nothing on record as of October 14, 2026. No lawsuit, organized opposition, or contested hearing over CyrusOne CIN3 (Cincinnati-Mason) in Mason, Warren 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.

Notes on the record

Confirmed via multiple aggregator listings (4800 Parkway Drive, Mason, OH); operator's own CIN3 URL 404s (stale slug) but facility corroborated independently.

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.

Cooling method and water use
Tax abatements or other public subsidy
Permanent jobs promised
Land area
How the community has received it

Which document closes each gap

Cooling method and water use: The water service agreement, any groundwater appropriation permit, and the mechanical narrative in the site plan.
Tax abatements or other public subsidy: The abatement, PILOT, or development agreement approved by the county, city, or development authority, and the state's data center sales tax exemption certificate if one was issued.
Permanent jobs promised: The economic development application or incentive agreement, which usually states a job commitment and a clawback.
Land area: The rezoning application, the plat, or the deed recorded with the county.
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.

Encore Technologies BLU1 (Blue Ash) · Blue Ash · Encore Technologies4 mi · Operating
Flexential Cincinnati (CIN01/02) · West Chester Township · Flexential7 mi · Operating
CyrusOne Lebanon Campus (CIN5 & CIN7) · Lebanon · CyrusOne8 mi · Operating
AWS Trenton / Madison-St. Clair Township Campus · Trenton · Amazon Web Services15 mi · Proposed · Contested
Prologis Project Mila · Trenton · Prologis15 mi · Permitted · 250 MW · Contested
Hamilton Innovation Center · Hamilton · Logistix Property Group15 mi · Proposed · Contested
Lumen Cincinnati 1 (400 Pike Street) · Cincinnati · Lumen Technologies17 mi · Operating
CyrusOne CIN2 (Cincinnati) · Cincinnati · CyrusOne18 mi · Operating · 14 MW

Tell us about your situation

Living near CyrusOne CIN3 (Cincinnati-Mason)?

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Questions people ask about this site

Is there opposition to the CyrusOne CIN3 (Cincinnati-Mason) data center in Mason?

Has anyone filed a lawsuit over the CyrusOne CIN3 (Cincinnati-Mason) data center?

No lawsuit over CyrusOne CIN3 (Cincinnati-Mason) appears in the record we track as of October 14, 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 CyrusOne CIN3 (Cincinnati-Mason) use?

No water withdrawal figure for CyrusOne CIN3 (Cincinnati-Mason) 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 CyrusOne CIN3 (Cincinnati-Mason), and how big is it?

CyrusOne is the operator on record. We hold 35 sites for that company across the registry. Capacity on record is 1 MW.

How to cite this page

SueDataCenters.org Data Center Registry, "CyrusOne CIN3 (Cincinnati-Mason)," updated October 14, 2026, https://suedatacenters.org/data-centers/cyrusone-cin3-cincinnati-mason-oh.

Facility data from Compute Atlas (E. Kubiak), version 1.34.1 (October 4, 2026), licensed CC BY 4.0, record https://www.compute-atlas.com/facilities/cyrusone-cin3-cincinnati-mason-oh, retrieved October 29, 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.CyrusOne facility directory · CyrusOne · retrieved September 21, 2026
2.OpenStreetMap way/31250931 · OpenStreetMap · retrieved July 22, 2026
3.HIFLD Electric Retail Service Territories (ORNL/DOE-CESER, 2023-08 vintage) · Oak Ridge National Laboratory (ORNL) / HIFLD · retrieved July 23, 2026
4.PeeringDB 'CyrusOne Mason', 4800 Parkway Dr suite 100, Mason 45040 · PeeringDB · retrieved October 14, 2026

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