In 2021, Grundy County, IA had a population of 12.3k people with a median age of 42 and a median household income of $74,552. Between 2020 and 2021 the population of Grundy County, IA grew from 12,262 to 12,336, a 0.603% increase and its median household income grew from $71,760 to $74,552, a 3.89% increase.
The 5 largest ethnic groups in Grundy County, IA are White (Non-Hispanic) (96%), White (Hispanic) (1.01%), Two+ (Non-Hispanic) (0.762%), Black or African American (Non-Hispanic) (0.721%), and Other (Non-Hispanic) (0.567%).
None of the households in Grundy County, IA reported speaking a non-English language at home as their primary shared language. This does not consider the potential multi-lingual nature of households, but only the primary self-reported language spoken by all members of the household.
99.4% of the residents in Grundy County, IA are U.S. citizens.
In 2021, the median property value in Grundy County, IA was $148,300, and the homeownership rate was 84.2%.
Most people in Grundy County, IA drove alone to work, and the average commute time was 21.7 minutes. The average car ownership in Grundy County, IA was 2 cars per household.
Grundy County, IA borders Black Hawk County, IA, Butler County, IA, Franklin County, IA, Hardin County, IA, Marshall County, IA, and Tama County, IA.