St. Tammany Parish, Louisiana: Power, Data Centers and the Local Economy
Home to Slidell, Mandeville and Covington
The data center boom is not abstract in St. Tammany Parish: it is on the ground here. The SAVRN Data Center Map lists 2 data centers in St. Tammany Parish, 9% of Louisiana's total. St. Tammany Parish is home to Slidell, Mandeville, Covington and Abita Springs. Construction employs 5,864, up 8.2% since 2019. Employers here counted 97,985 jobs in 2025, up 8.2% from 2019 (the 6th fastest growth of 64 Louisiana counties). Electrical contractors employ 614, up 6.0% since 2019 against down 2.9% statewide, at an average $64,420 a year.
Cities and towns in St. Tammany Parish
St. Tammany Parish is home to Slidell, Mandeville, Covington and Abita Springs.
Unincorporated communities (governed by the county): Eden Isle, Lacombe, Lewisburg.
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 St. Tammany Parish
1st = the most. Ranks cover counties with a value on record.
| Measure | Then | Now | Change | Rank in Louisiana |
|---|---|---|---|---|
| Population (2020 → 2025) | 264,989 | 279,108 | ▲ 5.3% | 4th of 64 by size |
| Total jobs (2019 → 2025) | 90,531 | 97,985 | ▲ 8.2% | 6th of 64 by growth |
| Average annual pay (2019 → 2025) | $47,811 | $61,502 | ▲ 28.6% | — |
| Construction jobs (2019 → 2025) | 5,418 | 5,864 | ▲ 8.2% | 23rd of 43 by growth |
| Electrical contractor jobs (2019 → 2025) | 579 | 614 | ▲ 6.0% | — |
| Data processing and hosting jobs (2019 → 2025) | 84 | 148 | ▲ 76.2% | — |
| Unemployment rate (2019 → August 2026) | 3.9% | 3.4% | ▼ 0.5pts | — |
Unemployment was 3.4% in August 2026, against 3.9% in 2019. Entergy Louisiana LLC is the largest utility serving St. Tammany Parish, one of 3 with territory here. Its residential customers paid an average 11.05¢/kWh in 2024, below the 11.88¢ median for Louisiana utilities. 279,108 people live here, up 5.3% since 2020, 4th of 64 Louisiana counties by population.
Who powers St. Tammany Parish
Utilities with service territory in St. Tammany Parish
| Utility | Ownership | Service | Residential customers (systemwide) | Residential price, 2024 | Commercial share of sales |
|---|---|---|---|---|---|
| Entergy Louisiana LLC | Investor Owned | Bundled | 957,522 | 11.05¢ | 20% |
| Cleco Power LLC | Investor Owned | Bundled | 251,927 | 12.33¢ | 32% |
| Washington-St Tammany E C, Inc | Cooperative | Bundled | 50,901 | 11.85¢ | 21% |
Customer counts, prices and sales shares cover each utility's whole system in the state, not only this county. Commercial sales include data centers.
No operating power plant is located in St. Tammany Parish in the EIA-860M inventory. Its power comes over the grid from plants elsewhere.
The St. Tammany Parish labor market
| Industry (2025) | Jobs | Average pay | Concentration vs U.S. |
|---|---|---|---|
| All industries | 97,985 | $61,502 | 1.00 |
| Construction | 5,864 | $74,313 | 1.13 |
| Electrical contractors | 614 | $64,420 | 0.87 |
| Data processing and hosting | 148 | $108,786 | 0.49 |
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 St. Tammany Parish
2 data centers in St. Tammany Parish are on the SAVRN Data Center Map.
St. Tammany Parish and its neighbors
Of the 7 counties that border St. Tammany Parish, Jefferson Parish 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 |
|---|---|---|---|---|---|---|
| St. Tammany Parish | 279,108 | ▲ 8.2% | — | — | 2 | — |
| Hancock County MS | 46,873 | ▲ 6.5% | 78 MW | — | — | — |
| Jefferson Parish | 431,398 | ▼ 2.1% | 2,449 MW | — | 1 | — |
| Orleans Parish | 362,154 | ▼ 6.7% | 156 MW | 8 MW | 4 | — |
| Pearl River County MS | 59,363 | ▲ 10.0% | — | — | — | — |
| St. John the Baptist Parish | 39,875 | ▼ 7.2% | — | — | — | — |
| Tangipahoa Parish | 141,346 | ▲ 7.7% | 100 MW | — | — | — |
| Washington Parish | 44,937 | ▲ 5.2% | 599 MW | 200 MW | — | — |
More of Louisiana
St. Tammany Parish, answered from the record
Who provides electricity in St. Tammany Parish, Louisiana?
3 utilities have service territory in St. Tammany Parish in the EIA-861 2024 report: Entergy Louisiana LLC, Cleco Power LLC, Washington-St Tammany E C, Inc. The largest, Entergy Louisiana LLC, charged residential customers 11.05¢/kWh on average in 2024.
What county is Slidell, LA in?
Slidell is in St. Tammany Parish, Louisiana. About 28,341 people live there (2025 Census estimate).
What county is Mandeville, LA in?
Mandeville is in St. Tammany Parish, Louisiana. About 12,918 people live there (2025 Census estimate).
What county is Covington, LA in?
Covington is in St. Tammany Parish, Louisiana. About 11,721 people live there (2025 Census estimate).
Are there data centers in St. Tammany Parish?
Yes. The SAVRN Data Center Map lists 2 data centers in St. Tammany Parish.
Is St. Tammany Parish adding jobs?
Employers counted 97,985 jobs in 2025 against 90,531 in 2019 (+8.2%, BLS QCEW). Construction went from 5,418 to 5,864.
Does St. Tammany Parish have a data center moratorium?
No county-level measure is on record for St. Tammany Parish. Louisiana has 3 local measures statewide, listed on the state page.