The median income of O'Fallon residents was an inflation-adjusted $40,096 per year. O'Fallon had 30,354 households in 2017, with a population of 85,246.
The city with the highest median resident income in the state was Country Life Acres. Country Life Acres's median income was $104,500 per year after adjusting for inflation – $64,404 more than O'Fallon. It had 39 households in 2017 and a population of 129.
Montreal had the lowest annual resident income among cities in Missouri, with a median income of only $2,499 per year. That was $37,597 less than the median income in O'Fallon at the time. Montreal had 44 households in 2017 and a population of 121.
The table below shows the top 100 cities ranked by median annual resident earnings in 2017.