Averill Park is a hamlet in Rensselaer County, New York, USA. The population was 1,517 at the 2000 census. The community is named after land owner James Averill. Averill Park is in the Town of Sand Lake on Route 43. The community is south of a triangle-shaped lake called Crystal Lake and is east of the hamlet of West Sand Lake. Averill Park apartments for rent comparison page shows most up to date rent information on Averill Park apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.