Johnston County, Oklahoma: Power, Data Centers and the Local Economy
Home to Tishomingo
Johnston County is not a build-out site today. It feels the boom through the grid it shares, the utilities that serve it and the work nearby. Johnston County is home to Tishomingo and Mannsville. Construction employs 102, up 45.7% since 2019. Next door, Bryan County has 1 data center. Unemployment was 5.8% in August 2026, against 4.2% in 2019. 304 MW of that came online in 2019 or later, mostly wind.
Cities and towns in Johnston County
Johnston County is home to Tishomingo and Mannsville.
Unincorporated communities (governed by the county): Bee, Coleman, Connerville, Earl, Emet, Pontotoc, Reagan.
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 Johnston County
1st = the most. Ranks cover counties with a value on record.
| Measure | Then | Now | Change | Rank in Oklahoma |
|---|---|---|---|---|
| Population (2020 → 2025) | 10,242 | 10,448 | ▲ 2.0% | 57th of 77 by size |
| Total jobs (2019 → 2025) | 2,891 | 3,038 | ▲ 5.1% | 26th of 77 by growth |
| Average annual pay (2019 → 2025) | $36,557 | $49,914 | ▲ 36.5% | — |
| Construction jobs (2019 → 2025) | 70 | 102 | ▲ 45.7% | 11th of 48 by growth |
| Unemployment rate (2019 → August 2026) | 4.2% | 5.8% | ▲ 1.6pts | — |
| Generating capacity added since 2019 | — | 304 MW | — | |
| Generating capacity retired since 2019 | — | 0 MW | — |
Employers here counted 3,038 jobs in 2025, up 5.1% from 2019. Its power plants have 304 MW of capacity, 100% of it wind. Electrical contractors employ 15, at an average $52,303 a year. Oklahoma Gas & Electric Co is the largest utility serving Johnston County, one of 5 with territory here. Its residential customers paid an average 11.78¢/kWh in 2024, below the 12.53¢ median for Oklahoma utilities. 10,448 people live here, up 2.0% since 2020.
Who powers Johnston County
Net change in operating capacity since 2019: +304 MW. Colors follow the fuel legend above.
Utilities with service territory in Johnston County
| Utility | Ownership | Service | Residential customers (systemwide) | Residential price, 2024 | Commercial share of sales |
|---|---|---|---|---|---|
| Oklahoma Gas & Electric Co | Investor Owned | Bundled | 710,123 | 11.78¢ | 44% |
| Public Service Co of Oklahoma | Investor Owned | Bundled | 501,093 | 12.73¢ | 36% |
| Red River Valley Rrl Elec Assn | Cooperative | Bundled | 15,852 | 11.38¢ | 20% |
| Southeastern Electric Coop Inc - (OK) | Cooperative | Bundled | 15,583 | 9.09¢ | 9% |
| People's Electric Cooperative | Cooperative | Bundled | 14,728 | 12.53¢ | 28% |
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 1
| Technology | Capacity | Share |
|---|---|---|
| Wind | 304 MW | 100% |
| Largest plants | Owner | Technology | MW | Since |
|---|---|---|---|---|
| Diamond Spring, LLC | ALLETE Clean Energy | Wind | 304 MW | 2020 |
The Johnston County labor market
| Industry (2025) | Jobs | Average pay | Concentration vs U.S. |
|---|---|---|---|
| All industries | 3,038 | $49,914 | 1.00 |
| Construction | 102 | $77,699 | 0.63 |
| Electrical contractors | 15 | $52,303 | 0.68 |
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 Johnston County
No data center, local measure or delayed project is on record in Johnston County. Oklahoma has 15 local measures on record statewide.
Johnston County and its neighbors
Of the 7 counties that border Johnston County, Murray 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 |
|---|---|---|---|---|---|---|
| Johnston County | 10,448 | ▲ 5.1% | 304 MW | — | — | — |
| Atoka County | 14,609 | ▲ 7.1% | — | — | — | — |
| Bryan County | 51,367 | ▲ 14.9% | 10 MW | — | 1 | — |
| Carter County | 48,910 | ▲ 0.6% | — | — | — | — |
| Coal County | 5,436 | ▼ 8.0% | 62 MW | — | — | — |
| Marshall County | 16,255 | ▲ 23.9% | — | — | — | — |
| Murray County | 13,805 | ▼ 13.8% | 512 MW | — | — | — |
| Pontotoc County | 38,528 | ▲ 7.8% | 152 MW | — | — | — |
More of Oklahoma
Johnston County, answered from the record
Who provides electricity in Johnston County, Oklahoma?
5 utilities have service territory in Johnston County in the EIA-861 2024 report: Oklahoma Gas & Electric Co, Public Service Co of Oklahoma, Red River Valley Rrl Elec Assn, Southeastern Electric Coop Inc - (OK). The largest, Oklahoma Gas & Electric Co, charged residential customers 11.78¢/kWh on average in 2024.
What power plants are in Johnston County?
1 operating plant with 304 MW of capacity. The largest is Diamond Spring, LLC (304 MW, wind).
Are there data centers in Johnston County?
The SAVRN Data Center Map has no data center in Johnston County. The nearest activity on record is next door in Bryan County.
Is Johnston County adding jobs?
Employers counted 3,038 jobs in 2025 against 2,891 in 2019 (+5.1%, BLS QCEW). Construction went from 70 to 102.
Does Johnston County have a data center moratorium?
No county-level measure is on record for Johnston County. Oklahoma has 15 local measures statewide, listed on the state page.