How many are licensed in District of Columbia, what level they hold, and how that compares per resident.
As of September 16, 2026, District of Columbia has 3,152 licensed boiler operators on its state register.
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“How many boiler operators” has more than one honest answer, and published figures disagree because they count different things without saying so. Here is each measure ATI holds for District of Columbia, named.
| Measure | Count | What it counts |
|---|---|---|
| Licensed workers on the state register | 3,152 | Records the register does not mark expired, revoked or surrendered, and that it evidences as a licence actually held. This is the figure every ATI surface reports as `current`, and the figure this page leads with. |
| ...of those, explicitly marked active | 3,150 | The narrower subset a register flags as active. Smaller, because many states publish no status at all and those records are counted above but not here. |
| All licence records, active or not | 7,185 | Includes lapsed, expired and inactive records. Larger, and not a workforce count. |
| Industry employment (BLS QCEW) | 1,855 | Everyone on the payroll of establishments in this industry, including office and sales staff, and counting a person once per job rather than once per licence. |
| Employer establishments | 84 | Physical business locations, not people. BLS QCEW where the county is disclosed, otherwise an ATI estimate on the same occupation share. |
ATI's headline figure is the first row: individual people holding an active licence, counted from the state register itself and refreshed nightly. See methodology and sources.
| State | Licensed boiler operators | Per 100k |
|---|---|---|
| Minnesota | 29,707 | 517.7 |
| Maryland | 3,409 | 55.2 |
| District of Columbia | 3,152 | 464.2 |
| Montana | 2,402 | 212.0 |
| Oregon | 2,362 | 55.8 |
District of Columbia is part of 51,134 licensed boiler operators nationally, and ranks #2 of 15 published states by per-capita density.
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