The Mid-Atlantic Association of Alpha Chapters (MAAC) includes all chapters in the states of Maryland and Delaware, and the District of Columbia.
| Key No. | Name | Chapter Type | Chapter Seat |
| 2 | Beta | College | Howard University Washington, D.C. |
| 45 | Beta Alpha | College | Morgan State University Baltimore, MD |
| 83 | Gamma Sigma | College | Delaware State College Dover, DE |
| 100 | Delta Nu | College | University of MD – Eastern Shore |
| 104 | Delta Lambda | Alumni | Baltimore, MD |
| 111 | Mu Lambda | Alumni | Washington, DC |
| 145 | Beta Alpha Lambda | Alumni | Baltimore County, MD |
| 174 | Gamma Theta Lambda | Alumni | Wilmington, DE |
| 203 | Delta Omicron Lambda | Alumni | Princess Anne, MD |
| 249 | Zeta Rho Lambda | Alumni | Dover, DE |
| 262 | Eta Eta Lambda | Alumni | Annapolis, MD |
| 359 | Eta Zeta | College | Bowie State University Bowie, MD |
| 403 | Iota Zeta | College | University of MD – College Park |
| 457 | Mu Rho | College | Towson State University Towson, MD |
| 460 | Mu Upsilon | College | Frostburg State University Frostburg, MD |
| 465 | Nu Beta | College | American University Catholic University George Washington University Georgetown University Washington, D.C. |
| 473 | Nu Kappa | College | University of MD – Baltimore County Baltimore, MD |
| 499 | Xi Omicron | College | University of Delaware Newark, DE |
| 500 | Omicron Lambda Alpha | Alumni | Washington, DC |
| 502 | Iota Alpha Lambda | Alumni | Aberdeen, MD |
| 520 | Iota Upsilon Lambda | Alumni | Silver Spring, MD |
| 528 | Kappa Epsilon Lambda | Alumni | Landover, MD |
| 543 | Kappa Phi Lambda | Alumni | Columbia, MD |
| 602 | Xi Xi Lambda | Alumni | Frederick, MD |
| 618 | Omicron Eta Lambda | Alumni | Washington, DC |
| 652 | Pi Upsilon Lambda | Alumni | Largo, MD |
| 672 | Rho Tau Lambda | Alumni | Baltimore, MD |
| 677 | Sigma Alpha Lambda | Alumni | Charles County, MD |
| 721 | Omicron Omicron | College | University of the District of Columbia Washington, DC |
| 737 | Pi Theta | College | Coppin State College Baltimore, MD |
| 790 | Sigma Sigma | College | Johns Hopkins University Baltimore, MD |
| 923 | Upsilon Epsilon | College | Salisbury State University Salisbury, MD |
| 956 | Phi Iota | College | McDaniel College Westminster, MD |