The median income of Franklin County residents was an inflation-adjusted $29,490 per year. Franklin County had 9,897 households in 2017, with a population of 25,599.
The county with the highest median resident income in the state was Johnson County. Johnson County's median income was $40,199 per year after adjusting for inflation – $10,709 more than Franklin County. It had 224,248 households in 2017 and a population of 578,797.
Crawford County had the lowest annual resident income among counties in Kansas, with a median income of only $20,585 per year. That was $8,905 less than the median income in Franklin County at the time. Crawford County had 14,974 households in 2017 and a population of 39,099.
The table below shows the top 100 counties ranked by median annual resident earnings in 2017.