In 2017, Grundy County, IA had a population of 12.4k people with a median age of 42.4 and a median household income of $65,170. Between 2016 and 2017 the population of Grundy County, IA declined from 12,373 to 12,354, a -0.154% decrease and its median household income grew from $61,606 to $65,170, a 5.79% increase.
The 5 largest ethnic groups in Grundy County, IA are White (Non-Hispanic) (97.1%), White (Hispanic) (1.12%), Two or More Races (Non-Hispanic) (0.688%), Black or African American (Non-Hispanic) (0.68%), and Asian (Non-Hispanic) (0.275%). N/A% 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 $129,900, and the homeownership rate is 80.4%. Most people in Grundy County, IA commute by Drove Alone, and the average commute time is 19.9 minutes. The average car ownership in Grundy County, IA is 2 cars per household.