In 2018, Spencer, IA had a population of 11.1k people with a median age of 42.3 and a median household income of $45,838. Between 2017 and 2018 the population of Spencer, IA declined from 11,132 to 11,092, a -0.359% decrease and its median household income grew from $45,719 to $45,838, a 0.26% increase.
The 5 largest ethnic groups in Spencer, IA are White (Non-Hispanic) (93%), Two+ (Non-Hispanic) (2.7%), White (Hispanic) (2.17%), Asian (Non-Hispanic) (0.739%), and Other (Hispanic) (0.739%). 0% of the households in Spencer, IA speak a non-English language at home as their primary language, and 99.2% of the residents in Spencer, IA are U.S. citizens.
In 2018, the median property value in Spencer, IA was $125,100, and the homeownership rate was 64.5%. Most people in Spencer, IA drove alone to work, and the average commute time was 13.5 minutes. The average car ownership in Spencer, IA was 2 cars per household.