Here is a list from a previous thread. Hope this helps.
Class Act Studios
Location: 77 Tarrytown Rd., White Plains, NY
Lighthouse Youth Theatre
Location: 1 Labriola Court Armonk, NY
Playgroup Theatre
Location: 1 North Broadway White Plains, NY
Random Farms' Kids Theatre
Location: 77 Executive Blvd, Elmsford, NY
SOOP Theatre
Location: Pelham, NY
StarKidz
Locations: Chappaqua, Harrison, Rye Brook, White Plains
Theatre O
Location: 25 State Street Ossining, NY
Westchester School of Speech & Drama
Location: 133 Popham Road Scarsdale, NY
White Plains Performing Arts Center (WPPAC)
Location: City Center, 11 City Pl, White Plains, NY 10601
Yorktown Stage
Location: 1974 Commerce Street, Yorktown Heights, NY