Summit is named from the ridge it contains that forms the watershed between the Mississippi and Missouri rivers.

[4] A post office named Linwood opened in March 1895.

[7] Summit Township covers an area of 35.59 square miles (92.2 km2) and contains one incorporated settlement, Adair.

According to the USGS, it contains two cemeteries: Saint Johns and Sunny Hill.

This article about the geography of Adair County, Iowa is a stub.