The following councils in the District of Columbia are affiliated with Washington Assembly.
- Washington, No. 224
- Keane, No. 353
- St. Anthony, No. 417
- Immaculate Conception Shrine, No. 4944
- Georgetown University, No. 6375
- St. Josaphat, No. 7530
- Catholic University of America, No. 9542
- St. Charles Lwanga, No. 9938
- Father Cyprian Tansi, No. 11496
The following councils are affiliated with Prince of the Church Assembly.
- Carroll, No. 377
- Potomac, No. 433
- Bishop Patrick J. Byrne, No. 3877
- St. Martin DePorres, No. 9368
- St. Cyprian, No. 10008
- Patrick Cardinal O'Boyle, No. 11302
- Our Lady of Victory, No. 11487
- St. Thomas More, No. 11578
St. Mary's County, Maryland
- St. Mary's, No. 1470, Leonardtown
- St. Michael's, No. 2065, Ridge
- Holy Face, No. 3849, Great Mills
- St. John Francis Regis, No. 7914, Hollywood
- Immaculate Conception, No. 8159, Mechanicsville
- Immaculate Heart of Mary, No. 9968, Lexington Park
- St. Francis Xavier the Missionary, No. 10957, Newtowne
Charles County and southeastern Prince George's County, Maryland
- Archbishop Neale, No. 2279, La Plata
- Dr. John Henry Griffin, No. 2293, Bryantown/Waldorf
- St. Columcille, No. 5317, Oxon Hill
- John Fitzgerald Kennedy, No. 5482, Accokeek
- Holy Ghost, No. 11484, Issue
Maurice McDonough, No. 12128, Pomphret
Northern Prince George's County and the Burtonsville and Takoma Park areas of Montgomery County, Maryland
- Patuxent, No. 2203, Laurel
- Prince George's, No. 2809, College Park
- St. John DeMatha, No. 5564, Hyattsville
- Bishop Thomas W. Lyons, No. 9808, Burtonsville
- St. Hugh, No. 10885, Greenbelt
- Queen of the Americas, No. 11304, Takoma Park
- Deacon John B. Lynn, No. 11619, Laurel
Lower Montgomery County, Maryland
- Father Rosensteel, No. 2169, Silver Spring
- Montgomery, No. 2323, Derwood
- Rock Creek, No. 2797, Bethesda
- Holy Family, No. 5547, Silver Spring
- Blessed Manyanet, No. 5567, Wheaton
- Father Peter Paul Maher, No. 6793, Olney
- Mater Dei, No. 9774, Rockville
- St. John the Baptist, No. 11106, Silver Spring
- Our Lady of Vietnam, No. 11769, Silver Spring
Central Prince George's County, Maryland
- St. Pius X, No. 4076, Forestville
- Mother Seton, No. 5381, Lanham
- St. Mary of the Assumption, No. 9302, Upper Marlboro
- St. Mary of Landover Hills, No. 10046, Landover Hills
- St. John the Evangelist, No. 11171, Clinton
- James C. Fletcher, No. 11422, Landover
Most Holy Rosary, No. 11511, Rosaryville
Bowie, Maryland
- Sacred Heart, No. 2577, Bowie
Father Peter C. Boyle, No., Bowie
Upper Montgomery County, Maryland
- Our Lady of Fatima, No. 6901, Barnesville
- Father Horace B. McKenna, No. 11024, Germantown
- St. Paul, No. 11105, Damascus
- Our Lady of Guadelupe, No. 12127, Gaithersburg
Calvert County and St. Francis De Sales parish in Charles County, Maryland
- Calvert, No. 7870, North Beach
- Our Lady, Star of the Sea, No. 9258, Solomons
Our Lady, Seat of Wisdom, No. 11259, Prince Frederick