Coverage area The district's territory covers substantial parts of the
towns of:
Beekman,
La Grange,
Pleasant Valley,
Poughkeepsie, and
Union Vale. The district also includes small parts of the following towns:
East Fishkill,
Hyde Park,
Pawling, and
Wappinger.
Census-designated places (
hamlets) within this district include Arlington,
Freedom Plains,
MacDonnell Heights,
Pleasant Valley,
Titusville, and
Vassar College, as well as portions of
Red Oaks Mill.
Enrollment , ACSD had 9,724 students. In the 2009–2010 school year one elementary school, LaGrange, was shut down, its last day being on June 23, 2010. Its building was converted into office space for the district.
Arlington Middle School was removed on June 20, 2014, and its building was converted into Arthur S. May Elementary School four days later. The previous Arthur S. May building from 1925 was closed on the latter date, and was repurposed into The Lofts at the School in late March 2023. Both structures had served as a high school for the district in the past. ==Schools==