In 2018, Spencer, IA had a population of 16.3k people with a median age of 42.7 and a median household income of $47,874. Between 2017 and 2018 the population of Spencer, IA declined from 16,387 to 16,313, a -0.452% decrease and its median household income declined from $48,978 to $47,874, a -2.25% decrease.
The 5 largest ethnic groups in Spencer, IA are White (Non-Hispanic) (93.5%), Two+ (Non-Hispanic) (1.96%), White (Hispanic) (1.89%), Other (Hispanic) (0.864%), and Asian (Non-Hispanic) (0.546%). 0% of the households in Spencer, IA speak a non-English language at home as their primary language, and 98.5% of the residents in Spencer, IA are U.S. citizens.
In 2018, the median property value in Spencer, IA was $120,600, and the homeownership rate was 68.8%. Most people in Spencer, IA drove alone to work, and the average commute time was 14.7 minutes. The average car ownership in Spencer, IA was 2 cars per household.