The average deputy salary at Polk County was $39,382 , which is 16 percent higher than the average salary for this job in Missouri, but 48 percent lower than the national average for this job . Deputy salaries at Polk County typically range from $38,272 to $40,248 (25th to 75th percentile). The highest reported deputy salary was $45,968. There are 13 employees at Polk County with the job title deputy.