^[1]

• 365 Amsterdam Council 1919 1925 ended 1925 ^[a]

• 378 Warren County Council 1920 1922 changed name to Glens Falls 378 1922
• 364 Albany Council 1916 1923 changed name to Fort Orange 364 1923
• 409 Troy Council 1919 1924 changed name to Troy Area 409 1924
• 399 Schenectady Council 1915 1926 changed name to Schenectady County 399 1926
• 378 Glens Falls Council 1922 1927 changed name to Mohican 378 1927
• 380 Columbia-Greene Council 1924 1927 changed name to Columbia County 380 1927
• 388 Washington County Council 1927 1930 merged into Mohican 378 1930
• 361 Montgomery County Council 1930 1935 merged into Sir William Johnson 377 1937
• 377 Fulton County Council 1923 1937 changed name to Sir William Johnson 377 1937
• 380 Columbia County Council 1927 1942 changed name to Fort Orange 364 1942
• 409 Troy Area Council 1924 1947 changed name to Uncle Sam 409 1947
• 364 Fort Orange Council 1923 1963 merged into Fort Orange-Uncle Sam 364 1963
• 409 Uncle Sam Council 1947 1963 merged into Fort Orange-Uncle Sam 364 1963
• 364 Fort Orange-Uncle Sam Council 1963 1971 changed name to Governor Clinton 364 1971

• 364 Governor Clinton Council 1971 #
• 377 Sir William Johnson Council 1937 #
• 684 Saratoga County Council 1924 #
• 399 Schenectady County Council 1926 #
• 378 Mohican Council 1927 #
• 364 Twin Rivers Council 1990

• 395 Champlain Valley Council 1926 1931 merged into Adirondack 394 1932
• 394 Adirondack Council 1924 #

The original portion of Twin Rivers was formed in 1991 by a merger of the former Governor Clinton Council (Columbia, Rensselaer and Albany Counties), the Sir William Johnson Council (Hamilton, Fulton & Montgomery counties) and the Saratoga Council (Saratoga County). A year or so later the Schenectady County Council (Schenectady County) was added after working out issues between the entities. Then in 1999, the Mohican (Warren and Washington counties) consolidated into the council. ^[2] On February 14, 2006, the Adirondack Council (Franklin, Clinton and Essex Counties) and the Twin Rivers Council merged to form the current boundaries of the Twin Rivers Council #364.

• Oswego County Council 1919 1920

• 366 Auburn Council 1919 1924 changed name to Cayuga County 366 1924
• 366 Cayuga County Council 1924
• 390 Syracuse Council 1915 1923 changed name to Onondaga County 390 1923
• 408 Watertown Council 1921 1925 changed name to Jefferson and Lewis Area 408 1925
• 390 Onondaga County Council 1923 1929 changed name to Onondaga-Cortland 390 1929
• 408 Jefferson and Lewis Area Council 1925 1932 changed name to Jefferson Lewis 408 1932
• 403 Saint Lawrence County Council 1921 1938 changed name to Saint Lawrence 403 1938
• 390 Onondaga Cortland Council 1929 1940 changed name to Onondaga 390 1940
• 365 Oswego County Council 1927 1969 merged into Hiawatha 373 1969
• 390 Onondaga Council 1940 1969 merged into Hiawatha 373 1969
• 403 Saint Lawrence Council 1938 1982 merged into Seaway Valley 403 1982
• 408 Jefferson Lewis Council 1932 1982 merged into Seaway Valley 403 1982
• 373 Hiawatha Council 1969 1998 December 31 merged into Hiawatha Seaway 373 1998 December 31
• 403 Seaway Valley Council 1982 1998 December 31 merged into Hiawatha Seaway 373 1998 December 31
• 373 Hiawatha Seaway Council 1999 January 1
• 373 Longhouse Council - Longhouse Council was formed in 2010 as a merger of Hiawatha Seaway Council and Cayuga County Council. The Hiawatha Seaway Council was formed in 1999 as a result of the merger of the Hiawatha Council and Seaway Valley Council.

The Hiawatha Seaway Council was formed in 1999 as a result of the merger of the Hiawatha Council and Seaway Valley Council. ^[3] The council is headquartered in Syracuse, NY.