The average planner salary at Harford County was $77,365 , which is 5 percent higher than the average salary for this job in Maryland, and 18 percent higher than the national average for this job . Planner salaries at Harford County typically range from $52,854 to $92,549 (25th to 75th percentile). The highest reported planner salary was $153,027. There are 14 employees at Harford County with the job title planner.