The estate was logically divided into three areas. The principal area of 1,500 acres, originally known as the "Woodland Property", was renamed the "Robert Allerton Park". A smaller area of land located north of the Park area was put to use for the Illinois 4-H Memorial Camp and its related recreational programs. Finally, the third and largest area composing 3,775 acres of land in eight different farms all north of the Sangamon river was farmed by tenants and the income used to support the rest of the Park.