Deans Mill School 35 Deans Mill Rd, Stonington, CT06378 Deans Mill School, located on Deans Mill Road, is one of three elementary schools in the Stonington public school…More system. The school serves students in grades kindergarten though fourth. Deans Mill School is home to ACES, otherwise known as the After Class Enrichment Program. ACES offers several after-school programs for students. Principal Doug Hammel leads the school.