Warren County, Missouri: Power, Data Centers and the Local Economy
Home to Warrenton, Wright City and Marthasville
No data center or power plant project is on record in Warren County, but the national build-out still reaches it through its utility bill, its labor market and the projects next door. Construction employs 1,019, up 53.0% since 2019, and construction is 2.1 times as concentrated here as in the U.S. economy. Warren County is home to Warrenton, Wright City, Marthasville and Truesdale. Employers here counted 9,000 jobs in 2025, up 17.8% from 2019 (the 4th fastest growth of 115 Missouri counties). Next door, Montgomery County has 3 data centers. 439 MW of that came online in 2019 or later, mostly solar.
Cities and towns in Warren County
Warren County is home to Warrenton, Wright City, Marthasville and Truesdale.
- Foristell also extends into St. Charles County.
Residents are 2025 Census estimates for the part of each city, town or township inside this county. Census publishes no annual estimate for unincorporated communities.
What changed in Warren County
1st = the most. Ranks cover counties with a value on record.
| Measure | Then | Now | Change | Rank in Missouri |
|---|---|---|---|---|
| Population (2020 → 2025) | 35,740 | 39,016 | ▲ 9.2% | 31st of 115 by size |
| Total jobs (2019 → 2025) | 7,642 | 9,000 | ▲ 17.8% | 4th of 115 by growth |
| Average annual pay (2019 → 2025) | $39,523 | $53,114 | ▲ 34.4% | — |
| Construction jobs (2019 → 2025) | 666 | 1,019 | ▲ 53.0% | 9th of 71 by growth |
| Unemployment rate (2019 → August 2026) | 2.9% | 3.7% | ▲ 0.8pts | — |
| Generating capacity added since 2019 | — | 439 MW | — | |
| Generating capacity retired since 2019 | — | 0 MW | — |
Its power plants have 439 MW of capacity, 100% of it solar. Unemployment was 3.7% in August 2026, against 2.9% in 2019. 39,016 people live here, up 9.2% since 2020. Union Electric Co - (MO) is the largest utility serving Warren County, one of 3 with territory here. Its residential customers paid an average 12.56¢/kWh in 2024.
Who powers Warren County
Net change in operating capacity since 2019: +439 MW. Colors follow the fuel legend above.
Utilities with service territory in Warren County
| Utility | Ownership | Service | Residential customers (systemwide) | Residential price, 2024 | Commercial share of sales |
|---|---|---|---|---|---|
| Union Electric Co - (MO) | Investor Owned | Bundled | 1,095,619 | 12.56¢ | 44% |
| Cuivre River Electric Coop Inc | Cooperative | Bundled | 72,974 | 11.07¢ | 4% |
| Callaway Electric Cooperative | Cooperative | Bundled | 12,647 | 16.29¢ | 22% |
Customer counts, prices and sales shares cover each utility's whole system in the state, not only this county. Commercial sales include data centers.
Operating power plants 2
| Technology | Capacity | Share |
|---|---|---|
| Solar | 439 MW | 100% |
| Largest plants | Owner | Technology | MW | Since |
|---|---|---|---|---|
| Split Rail Solar Energy LLC | Invenergy Services LLC | Solar | 300 MW | 2026 |
| Blue Bird Solar, LLC | Blue Bird Solar, LLC | Solar | 139 MW | 2024 |
The Warren County labor market
| Industry (2025) | Jobs | Average pay | Concentration vs U.S. |
|---|---|---|---|
| All industries | 9,000 | $53,114 | 1.00 |
| Construction | 1,019 | $63,146 | 2.14 |
Concentration is the BLS location quotient: 1.0 means the industry holds the same share of local jobs as it does nationally. Industry rows count private employers; cells BLS suppresses are left out.
Data centers and local rules in Warren County
No data center, local measure or delayed project is on record in Warren County. Missouri has 21 local measures on record statewide, and 1 neighboring county has one: St. Charles County.
Warren County and its neighbors
Of the 5 counties that border Warren County, Franklin County carries the most build-out activity: data centers, planned generation and operating plants combined.
| County | Population | Jobs since 2019 | Operating MW | Planned MW | Data centers | Local measures |
|---|---|---|---|---|---|---|
| Warren County | 39,016 | ▲ 17.8% | 439 MW | — | — | — |
| Franklin County | 108,090 | ▲ 0.6% | 2,389 MW | — | — | — |
| Gasconade County | 14,784 | ▼ 5.6% | — | — | — | — |
| Lincoln County | 66,676 | ▲ 9.4% | 150 MW | — | — | — |
| Montgomery County | 11,590 | ▲ 9.0% | 6 MW | — | 3 | — |
| St. Charles County | 426,499 | ▲ 7.1% | 1,104 MW | — | 1 | 1 |
More of Missouri
Warren County, answered from the record
Who provides electricity in Warren County, Missouri?
3 utilities have service territory in Warren County in the EIA-861 2024 report: Union Electric Co - (MO), Cuivre River Electric Coop Inc, Callaway Electric Cooperative. The largest, Union Electric Co - (MO), charged residential customers 12.56¢/kWh on average in 2024.
What power plants are in Warren County?
2 operating plants with 439 MW of capacity. The largest is Split Rail Solar Energy LLC (300 MW, solar).
Are there data centers in Warren County?
The SAVRN Data Center Map has no data center in Warren County. The nearest activity on record is next door in Montgomery County.
Is Warren County adding jobs?
Employers counted 9,000 jobs in 2025 against 7,642 in 2019 (+17.8%, BLS QCEW). Construction went from 666 to 1,019.
Does Warren County have a data center moratorium?
No county-level measure is on record for Warren County. Missouri has 21 local measures statewide, listed on the state page.