Highest City of O'Fallon employee salary in year 2024 was $204,331. City of O'Fallon employees number in year 2024 was 513. City of O'Fallon average salary was $63,663 and median salary was $63,517. According to the last payroll, City of O'Fallon average salary is 15 percent lower than USA average but 23 percent higher than Missouri state average. City of O'Fallon employee salaries are usually between $47,889 and $83,143. Top 10% of highest-earning employees have salaries ranging from $100,331 to $204,331. From 2023 to 2024, the average salary of employees at this employer increased 2.8 percent, the median salary increased 4.2 percent.