Green Castle lies along the junction of North 51st Avenue W and West 112th Street N, a half mile west of Iowa Highway 117.[1]
History
Greencastle was platted in Section 16 of Powesheik Township. The first settler, in 1846, was Joseph Slaughter. A school was built there in 1849, a flour mill followed in 1875, and in 1878 15 buildings were constructed in Greencastle.[2]
The Greencastle post office opened in August 1856 and closed in December 1901.[3]
The population of Greencastle was 125 in 1887,[4] and was 42 in 1902.[5]