Area Professional Theatre
- Accokeek Creek Theatre Company
- Actors Company Theatre
- Adventure Theatre MTC (Adventure Theatre merged with Musical Theatre Center)
- African Continuum Theatre Company
- Arena Stage
- Baltimore Childrens Theatre
- Bay Theatre Company
- Brave Spirits Theatre
- Center Stage
- Cherry Red Productions
- Chesapeake Bay Floating Theatre, Inc.
- Chesapeake Shakespeare Company
- Cumberland Theatre
- Dark Horse Theatre Company
- Didactic Theatre Company
- Embassy Players
- Folger Shakespeare Library
- Fraudulent Productions
- Ganymede Arts
- Globo Stage
- Happenstance Theater
- Hexagon
- Horizons Theatre
- Imagination Stage
- Landless Theatre Company
- Lumina Studio Theatre
- Maryland Ensemble Theatre, Frederick, MD
- Murder Upon Request
- Musical Theatre Center
- Mystery Cafe of MD, DC & VA
- Natural Theatricals, Alexandria, VA
- New Play House, Frederick, MD
- Olney Theatre Center
- OneStage Productions
- Paradigm Players @ BAPA
- Peace Mountain Theatre Company
- Pumpkin Theatre, Baltimore
- Purple Light Theatre Company, Baltimore
- Quotidian Theatre Company
- Red Branch Theatre Company
- Redlight Theatre Company
- Rorschach Theatre
- Round House Theatre
- Schoolhouse Theatre Arts, Inc.
- September Song, Westminster, MD
- The Shakespeare Theatre
- Signature Theatre
- Single Carrot Theatre (Baltimore)
- Stanislavsky Theatre Studio
- Stealing Thunder Theatre Company
- Stroyka Theater
- The Studio Theatre
- The Theatre Lab
- Theatre Alliance
- Theatre Project (Baltimore)
- Timonium Dinner Theatre
- Toby's Dinner Theatre (Columbia and Baltimore)
- Towson University Theatre Department
- Troika Entertainment
- Trumpet Vine Theatre Company
- Venus Theatre
- Vpstart Crow Productions
- The Washington Savoyards, LTD
- Washington Shakespeare Company
- The Washington Stage Guild
- The Welders Theatre Company
- Woolly Mammoth Theatre Company (Washington, DC)
- The Young Victorian Theatre Company (Towson, MD)
- Zemfira Stage