Registered plumber apprentices by county, open recruitment windows where the state publishes them, and how the apprentice tier fits Missouri's licence ladder. Updated nightly.
Missouri has 767 registered plumber apprentices in active status (fiscal year 2025, DOL RAPIDS), placed in 60 counties, 1.2 per 10,000 residents. That is 9.0 apprentices for every 100 employed plumbers in the state, the rate at which the trade is training its own replacements.
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Registered plumber apprentices by county of the apprentice, largest first. Each county links to its plumbers market page.
| County | Apprentices | Share | Per 10k residents |
|---|---|---|---|
| St. Louis County | 155 | 20% | 1.6 |
| St. Charles County | 80 | 10% | 1.9 |
| Jefferson County | 58 | 8% | 2.5 |
| Greene County | 57 | 7% | 1.9 |
| Jackson County | 55 | 7% | 0.8 |
| St. Louis city | 41 | 5% | 1.5 |
| Cass County | 27 | 4% | 2.4 |
| Clay County | 27 | 4% | 1.0 |
| Franklin County | 25 | 3% | 2.3 |
| Lincoln County | 22 | 3% | 3.4 |
| Warren County | 21 | 3% | 5.6 |
| Boone County | 17 | 2% | 0.9 |
| Christian County | 12 | 2% | 1.3 |
| Cole County | 11 | 1% | 1.4 |
| Johnson County | 11 | 1% | 2.0 |
| 45 other counties | 148 | 19% |
Source: DOL RAPIDS apprenticeship FY2025, active status, county-coded; as of December 31, 2025.
Credential types the No statewide plumbing licence. Missouri statute requires plumber certification in cities and towns of 15,000 or more inhabitants, administered by those municipalities. issues for this trade: Municipal Master Plumber certificate, Municipal Journeyman Plumber certificate. See how to get a plumber license in Missouri for hours, exams and renewal.
Sources: registered apprentices: DOL RAPIDS apprenticeship FY2025, active status, as of December 31, 2025; employment: BLS QCEW construction x OEWS occupation share (estimate); population: U.S. Census 2023 estimates.
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