Registered plumber apprentices by county, open recruitment windows where the state publishes them, and how the apprentice tier fits Illinois's licence ladder. Updated nightly.
Illinois has 1,062 registered plumber apprentices in active status (fiscal year 2025, DOL RAPIDS), placed in 75 counties, 0.8 per 10,000 residents. That is 6.8 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 |
|---|---|---|---|
| Cook County | 322 | 30% | 0.6 |
| Will County | 91 | 9% | 1.3 |
| McHenry County | 41 | 4% | 1.3 |
| Madison County | 39 | 4% | 1.5 |
| Lake County | 29 | 3% | 0.4 |
| Rock Island County | 29 | 3% | 2.1 |
| Williamson County | 27 | 3% | 4.0 |
| Crawford County | 26 | 2% | 14.2 |
| DuPage County | 26 | 2% | 0.3 |
| St. Clair County | 25 | 2% | 1.0 |
| Peoria County | 24 | 2% | 1.4 |
| Kane County | 22 | 2% | 0.4 |
| Winnebago County | 21 | 2% | 0.7 |
| Clark County | 19 | 2% | 12.6 |
| Jackson County | 19 | 2% | 3.6 |
| 60 other counties | 302 | 28% |
Source: DOL RAPIDS apprenticeship FY2025, active status, county-coded; as of December 31, 2025.
Illinois records apprentices on its own plumber licence register as Apprentice: 4,037 active apprentice-tier records against 8,500 journeyman records, a ratio of 0.47 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 Illinois Department of Public Health (IDPH), Plumbing Program issues for this trade: Apprentice Plumber, Licensed Plumber (journeyman), Plumbing Contractor registration. See how to get a plumber license in Illinois 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: Illinois register read September 16, 2026; population: U.S. Census 2023 estimates.
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