Allendale Columbia School is an independent, nonsectarian, college preparatory school for students in nursery through twelfth grade in Rochester, New York, USA. The Columbia School for girls, established in 1890 by Caroline Milliman and Alida Lattimore, and the Allendale School for boys, established in 1926 by a group of Rochester businessmen, merged in 1972 to form the current co-educational school. Allendale Columbia students come from 28 difference school districts in the greater Rochester, New York region, as well as from 10 different countries. (International students live in two houses on campus.). The school was named by Worth magazine as of one the top 100 feeder schools to Ivy League Universities.