Kellogg is a city in Jasper County, Iowa, United States. The population was 606 at the time of the 2020 census. It was originally named Man…Kellogg is a city in Jasper County, Iowa, United States. The population was 606 at the time of the 2020 census. It was originally named Manning's Station, then carried the names Jasper City, Kimball, and then finally Kellogg, named for the pioneer settler Judge Abel Avery Kellogg.