Clark Township, Tama County, Iowa
Clark Township was organized in 1860. 
In 1882, Clark Township was named in honor of Judge Leander Clark. This is documented on page 662 of the book "History of Tama County Iowa, 1883". Here is the full text:
Clark township was so named in honor of Judge Leander Clark. Quite a number of names were proposed among which were "Plain," on account of its level surface, and "Rock Creek," after the creek of that name, but "Clark" was finally decided upon. 
- Chapman, Samuel D. (1879). History of Tama County, Iowa: Its Cities, Towns and Villages. Toledo Times Office. p. 88.
- Page 662 of the book "History of Tama County Iowa, 1883".
|This article about the geography of Tama County, Iowa is a stub. You can help Wikipedia by expanding it.|