The first settlers intended to name their new township Fair Haven Township, because many of them were natives of Fair Haven, Connecticut.

[1] Elk River Township covers an area of 51.87 square miles (134.3 km2) and contains one incorporated settlement, Andover.

According to the USGS, it contains five cemeteries: Andover, Hauntown, Smith, Teeds Grove and Wilson.

The streams of Cook Slough, Dark Chute, Elk River, North Branch Elk River, Schramling Creek and Silver Creek run through this township.

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