Populations of Iowa Cities (by county). Alphabetical Listing of Cities · Cities ranked by Population Populations of Iowa Cities Ranked by Population Size. This is a list of 99 counties in Iowa. Iowa Counties. Find homes for sale in popular Iowa counties or search by region, city or neighborhood. Search. Iowa State University Annual Estimates of the Total Population for Counties. Source: U.S. Census Bureau. Units: Number of residents, as of July 1st each year unless otherwise noted. Additional data: Download View data for cities or states. Local government in Iowa consists of 99 counties and cities. In Iowa, initiative is only available in charter cities. List of counties. Map of. population of Iowa as of July 1,. , making The number of Latino families in countries: Costa Rica, El Salvador, Guatemala, Honduras and Nicaragua. Get a list of Iowa counties by population based on Census data.