Kellogg, IA has a population of 777 and is the 16,807th largest city in the United States. The population density is 2,127 per sq mi which is 3794% higher than the Iowa average and 2248% higher than the national average. The median age in Kellogg is 36 which is approximately 5% lower than the Iowa average of 38. In Kellogg, 52% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 80% of Kellogg residents were born in Iowa, 19% were born out of state, 0% were born outside of the United States and 1% were foreign born.