The average secretary salary at Clinton County was $41,434 , which is 7 percent lower than the average salary for this job in Iowa, and 41 percent lower than the national average for this job . Secretary salaries at Clinton County typically range from $35,667 to $47,200 (25th to 75th percentile). The highest reported secretary salary was $49,475. There are 4 employees at Clinton County with the job title secretary.