Boilermakers Local 13 covers the following counties in Pennsylvania and Delaware.
- Adams
- Berks
- Bucks
- Bradford
- Carbon
- Centre
- Chester
- Clinton
- Columbia
- Cumberland
- Dauphin
- Delaware
- Franklin
- Fulton
- Huntingdon
- Juniata
- Lackawanna
- Lancaster
- Lebanon
- Lehigh
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Luzerne
- Lycoming
- Mifflin
- Montgomery
- Montour
- Northampton
- Northumberland
- Perry
- Pike
- Potter
- Philadelphia
- Schuylkill
- Snyder
- Sullivan
- Susquehanna
- Tioga
- Union
- Wayne
- Wyoming
- York
- New Castle (DE)
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