Here are the 5 top paying cities for a physical therapist assistant salary. Lakeland, Florida – Average PTA Salary: $77,230. 1  On average, PTAs in Lakeland earn a salary of $77,230 which is $25,070 higher than the average physical therapist assistant salary.TA Salaries by State. PTAs are earning a wide range of salaries in different states. Annual PTA salaries range from $44,390 to $69,870. Click a state to see the median PTA salaries in each state’s major cities.