In 2018, Grundy County, IA had a population of 12.3k people with a median age of 42.5 and a median household income of $66,965. Between 2017 and 2018 the population of Grundy County, IA declined from 12,354 to 12,341, a -0.105% decrease and its median household income grew from $65,170 to $66,965, a 2.75% increase.
The 5 largest ethnic groups in Grundy County, IA are White (Non-Hispanic) (97%), White (Hispanic) (1.26%), Two+ (Non-Hispanic) (0.673%), Black or African American (Non-Hispanic) (0.559%), and Asian (Non-Hispanic) (0.357%). NaNk% of the people in Grundy County, IA speak a non-English language, and 99.8% are U.S. citizens.
The median property value in Grundy County, IA is $131,200, and the homeownership rate is 79.5%. Most people in Grundy County, IA commute by Drove Alone, and the average commute time is 20.4 minutes. The average car ownership in Grundy County, IA is 2 cars per household.