The median income of Fairfield County residents was an inflation-adjusted $30,342 per year. Fairfield County had 55,549 households in 2017, with a population of 151,526.
The county with the highest median resident income in the state was Delaware County. Delaware County's median income was $44,208 per year after adjusting for inflation – $13,866 more than Fairfield County. It had 67,701 households in 2017 and a population of 193,024.
Athens County had the lowest annual resident income among counties in Ohio, with a median income of only $14,351 per year. That was $15,991 less than the median income in Fairfield County at the time. Athens County had 22,509 households in 2017 and a population of 65,563.
The table below shows the state's counties ranked by median annual resident earnings in 2017.