The median income of New Castle County residents was an inflation-adjusted $33,696 per year. New Castle County had 202,654 households in 2017, with a population of 555,036.
Kent County had the lowest annual resident income among counties in Delaware, with a median income of only $28,873 per year. That was $4,823 less than the median income in New Castle County at the time. Kent County had 63,381 households in 2017 and a population of 173,145.
The table below shows the state's counties ranked by median annual resident earnings in 2017.