Callender is a city in Webster County, Iowa, United States. The population was 368 at the time of the 2020 census. From 1866 to 1870, the Des …Callender is a city in Webster County, Iowa, United States. The population was 368 at the time of the 2020 census. From 1866 to 1870, the Des Moines Valley Railroad Company constructed tracks between Des Moines and Fort Dodge. The other end of the line originated at Keokuk. As a result, several small towns were created by the railroad along the line to support track maintenance and to grow business. At 7 to 10 mi intervals were 38 stops between Keokuk and Fort Dodge. Kesho, the town that would become Callender, was the 36th stop.