Congregation Sons of Israel Cemetery: The cemetery is on Havell Street (east of Route 9), adjacent to (west of) Dale Cemetery entrance.
(Not marked as such but owned by Congregation Sons of Israel; Synagogue and now located at 1666 Pleasantville Road, Briarcliff Manor, NY 10510.
Approximately 100 graves, all Jewish, from late 19th century to about 1970's. No key needed. No onsite caretaker. The cemetery is located on steep hill below Havell Street (numerous steps lead to about three intermediate burial levels before reaching valley; bottom is main burial area). Direct questions to above synagogue.
Dale Cemetery: see Congregations Sons of Israel Cemetery.