Three Rivers Business Alliance (3RBA) is the LGBT+ Chamber of Commerce for the Pittsburgh/Greater Allegheny Region. 3RBA serves the LGBT+ owned and allied businesses operating in the following regions:
- Southwestern Pennsylvania (Allegheny, Armstrong, Beaver, Bedford, Blair, Butler, Cambria, Clearfield, Fayette, Greene, Indiania, Lawerence, Somerset, Washington, and Westmoreland Counties);
- Southeastern Ohio (Belmont, Carroll, Columbiana, Harrison, Jefferson, Mahoning, Monroe, and Washington Counties);
- Northern West Virginia (Brooke, Dodd-Ridge, Hancock, Harrison, Marion, Marshall, Monongalia, Ohio, PLeasants, Preston, Taylor, Tyler, and Wetzel Counties); and
- Northwestern Maryland (Allegheny and Garrett Counties).