Garner, IA has a population of 3,091 and is the 8,660th largest city in the United States. The population density is 1,422 per sq mi which is 2504% higher than the Iowa average and 1470% higher than the national average. The median age in Garner is 42 which is approximately 11% higher than the Iowa average of 38. In Garner, 71% of the population over 15 years of age are married, 96% speak English and 3% speak Spanish. 78% of Garner residents were born in Iowa, 19% were born out of state, 0% were born outside of the United States and 3% were foreign born.