Principal Engineer salary at St. Louis County

The average principal engineer salary at St. Louis County was $134,923 , which is 35 percent higher than the average salary for this job in Minnesota, and 25 percent higher than the national average for this job . Principal Engineer salaries at St. Louis County typically range from $126,339 to $146,955 (25th to 75th percentile). The highest reported principal engineer salary was $161,340. There are 5 employees at St. Louis County with the job title principal engineer.