Hubbard is a city in Hardin County, Iowa, United States. The population was 860 at the time of the 2020 census. Hubbard was settled as a co…Hubbard is a city in Hardin County, Iowa, United States. The population was 860 at the time of the 2020 census. Hubbard was settled as a community in the year 1880, following construction of the railroad through the territory. It was named for Judge Nathaniel M. Hubbard, railroad attorney.