Janesville, IA has a population of 795 and is the 16,652nd largest city in the United States. The population density is 545 per sq mi which is 898% higher than the Iowa average and 502% higher than the national average. The median age in Janesville is 45 which is approximately 19% higher than the Iowa average of 38. In Janesville, 69% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 84% of Janesville residents were born in Iowa, 16% were born out of state, 0% were born outside of the United States and 0% were foreign born.
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The population density in Janesville is 898% higher than Iowa.
The median age in Janesville is 19% higher than Iowa.
In Janesville 100.00% of the population is White.
In Janesville 0.00% of the population is Black or African American.