Data Center Registry

Mason City South Side Data Center Site (43rd Street SW)

Mason City, Cerro Gordo County, Iowa

ProposedContestedRecord updated October 29, 2026

Mason City South Side Data Center Site (43rd Street SW) is a proposed data center in Mason City, Iowa (Cerro Gordo County), operated by Undisclosed developer. The public record puts it at announced March 2026, 380 acres. It is the subject of active public debate, with hearings, petitions, or organized opposition on record.

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

Proposed

Operator: Undisclosed developer
Facility type: Data center
Location: Mason City, Cerro Gordo County, IA
Coordinates: 43.1100, -93.2150 (approximate)
Power capacity: Not established from a public source
Land: 380 acres
Investment: Not established from a public source
Announced: March 2026
Utility: Not established from a public source
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: Contested
Source confidence: Reported by at least one credible outlet or filing

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.

March 2026
Proposed
Mason City council approved first reading (4-2) of rezoning of parcels south of 19th Street SW / east of South Pierce Avenue that could allow a data center; land rezoned for industrial use in April 2026; no development agreement in place Source: NorthIowaNow

Opposition and litigation at this site

Yes. Mason City South Side Data Center Site (43rd Street SW) in Mason City, Cerro Gordo County, Iowa is contested. Hearings, public comment, petitions, or organized opposition are on record, and no lawsuit has been filed so far. More than a dozen residents spoke against or questioned the rezoning at the March 2026 first reading, citing environmental effects, noise and property values.

How the community has taken it

Reception is a sourced signal, not an editorial judgment: contested means active public debate is on record, with hearings, petitions, or organized opposition, without litigation.

More than a dozen residents spoke against or questioned the rezoning at the March 2026 first reading, citing environmental effects, noise and property values.

Source: NorthIowaNow

Notes on the record

Roughly 380 acres (mayor's estimate; 'nearly 400 acres') of farmland on the south side of Mason City along 43rd Street SW. KIMT (Sep 2026) reports sources confirmed QTS has expressed interest and a data center company submitted designs, but the city says it has not entered negotiations with any company, so the operator is left undisclosed. Coordinates are an approximate south-side placement, not a parcel point.

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
Tax abatements or other public subsidy
Permanent jobs promised
Which utility serves 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.
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.
Which utility serves it: The electric service agreement or the utility's filing with the state public utility commission.

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.

South Front Networks IA-Emery · Mason City · South Front Networks4 mi · Operating
MCNI Concord Township Data Center (rezoning denied) · Garner · MCNI20 mi · Cancelled · Opposed
Simple Mining Osage (Mitchell County) Bitcoin Mine Proposal · Osage · Simple Mining24 mi · Cancelled · 12 MW · Opposed

Tell us about your situation

Living near Mason City South Side Data Center Site (43rd Street SW)?

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Questions people ask about this site

Is there opposition to the Mason City South Side Data Center Site (43rd Street SW) in Mason City?

Has anyone filed a lawsuit over the Mason City South Side Data Center Site (43rd Street SW)?

No lawsuit over Mason City South Side Data Center Site (43rd Street SW) appears in the record we track as of October 29, 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 Mason City South Side Data Center Site (43rd Street SW) use?

No water withdrawal figure for Mason City South Side Data Center Site (43rd Street SW) 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 Mason City South Side Data Center Site (43rd Street SW), and how big is it?

Undisclosed developer is the operator on record. No capacity figure is on record for this site. The site is recorded at 380 acres.

How to cite this page

SueDataCenters.org Data Center Registry, "Mason City South Side Data Center Site (43rd Street SW)," updated October 29, 2026, https://suedatacenters.org/data-centers/mason-city-south-side-data-center-site-ia.

Facility data from Compute Atlas (E. Kubiak), version 1.35.1 (November 2, 2026), licensed CC BY 4.0, record https://www.compute-atlas.com/facilities/mason-city-south-side-data-center-site-ia, retrieved November 5, 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.Mason City council advances rezoning proposal amid data center concerns · NorthIowaNow · retrieved October 29, 2026
2.Mason City considers future of newly rezoned land; data center among possibilities · KIMT · retrieved October 29, 2026

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