The median income of Kent County residents was an inflation-adjusted $27,747 per year. Kent County had 236,929 households in 2017, with a population of 636,376.
The county with the highest median resident income in the state was Oakland County. Oakland County's median income was $36,567 per year after adjusting for inflation – $8,820 more than Kent County. It had 499,617 households in 2017 and a population of 1,241,860.
Isabella County had the lowest annual resident income among counties in Michigan, with a median income of only $17,211 per year. That was $10,536 less than the median income in Kent County at the time. Isabella County had 24,898 households in 2017 and a population of 70,572.
The table below shows the state's counties ranked by median annual resident earnings in 2017.