In 2019, Mercer County, MO had a population of 3.64k people with a median age of 42.9 and a median household income of $47,298. Between 2018 and 2019 the population of Mercer County, MO declined from 3,664 to 3,644, a −0.546% decrease and its median household income grew from $44,085 to $47,298, a 7.29% increase.
The 5 largest ethnic groups in Mercer County, MO are White (Non-Hispanic) (95.7%), White (Hispanic) (1.62%), Two+ (Non-Hispanic) (0.933%), Other (Hispanic) (0.631%), and Black or African American (Non-Hispanic) (0.549%). 0% of the households in Mercer County, MO speak a non-English language at home as their primary language, and 98.9% of the residents in Mercer County, MO are U.S. citizens.
In 2019, the median property value in Mercer County, MO was $88,900, and the homeownership rate was 78.6%. Most people in Mercer County, MO drove alone to work, and the average commute time was 21.4 minutes. The average car ownership in Mercer County, MO was 3 cars per household.