Dual County League
The Dual County League is a dual county high school athletic conference in District A of the Massachusetts Interscholastic Athletic Association. The conference serves schools from Middlesex County and Suffolk County
Schools/Divisions
The following eleven schools are a member of the Dual County League.| School | Location | Colors | Type | Enrollment | Nickname |
| Acton-Boxborough Regional High School | Acton, Massachusetts | Blue & Gold | public secondary | 1951 | Colonials |
| Bedford High School | Bedford, Massachusetts | Blue & White | public secondary | 785 | Buccaneers |
| Boston Latin School | Boston, Massachusetts | Purple & White | public exam secondary | 2383 | Wolfpack |
| Cambridge Rindge and Latin School | Cambridge, Massachusetts | Black & Silver | public secondary | 1836 | Falcons |
| Concord-Carlisle High School | Concord, Massachusetts | Maroon & Gold | public secondary | 1300 | Patriots |
| Lincoln-Sudbury Regional High School | Sudbury, Massachusetts | Navy Blue & Red | public secondary | 1641 | Warriors |
| Newton South High School | Newton, Massachusetts | Blue & Orange | public secondary | 1740 | Lions |
| Waltham High School | Waltham, Massachusetts | Red & White | public secondary | 1375 | Hawks |
| Wayland High School | Wayland, Massachusetts | Orange & Black | public secondary | 870 | Warriors |
| Westford Academy | Westford, Massachusetts | Maroon & Grey | public secondary | 1651 | Grey Ghosts |
| Weston High School | Weston, Massachusetts | Maroon, Silver & White | public secondary | 757 | Wildcats |