Registered plumber apprentices by county, open recruitment windows where the state publishes them, and how the apprentice tier fits Maryland's licence ladder. Updated nightly.
Maryland has 614 registered plumber apprentices in active status (fiscal year 2025, DOL RAPIDS), placed in 18 counties, 1.0 per 10,000 residents. That is 5.0 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 |
|---|---|---|---|
| Prince George's County | 290 | 47% | 3.1 |
| Baltimore city | 125 | 20% | 2.2 |
| Howard County | 53 | 9% | 1.6 |
| Baltimore County | 34 | 6% | 0.4 |
| Worcester County | 25 | 4% | 4.6 |
| Anne Arundel County | 20 | 3% | 0.3 |
| Allegany County | 15 | 2% | 2.2 |
| Cecil County | 12 | 2% | 1.1 |
| Wicomico County | 9 | 1% | 0.9 |
| Harford County | 8 | 1% | 0.3 |
| Carroll County | 5 | 1% | 0.3 |
| Charles County | 4 | 1% | 0.2 |
| Montgomery County | 4 | 1% | 0.0 |
| Frederick County | 3 | 0% | 0.1 |
| Washington County | 3 | 0% | 0.2 |
| 3 other counties | 4 | 1% |
Source: DOL RAPIDS apprenticeship FY2025, active status, county-coded; as of December 31, 2025.
Maryland records apprentices on its own plumber licence register as PLUMBER APPRENTICE PLUMBER/GAS FITTER: 3,469 active apprentice-tier records against 1,615 journeyman records, a ratio of 2.15 apprentice records per journeyman, register read September 16, 2026. The register's apprentice tier and the federal registered-apprenticeship count in the county table are two different systems: a licence-register apprentice is anyone the state has credentialed to work under supervision, a registered apprentice is enrolled in a DOL-registered program.
Counts are license records, not people: a holder with more than one license appears once per license, and a contractor license is a business, not a worker.
Credential types the Maryland Board of Plumbing, Division of Occupational and Professional Licensing, Maryland Department of Labor issues for this trade: Apprentice Plumber/Gas Fitter, Journey Plumber/Gas Fitter, Master Plumber/Gas Fitter. See how to get a plumber license in Maryland 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); licence tiers: Maryland register read September 16, 2026; population: U.S. Census 2023 estimates.
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