Highest salary at Town of Johnston in year 2020 was $115,242. Number of employees at Town of Johnston in year 2020 was 79. Average annual salary was $44,547 and median salary was $43,800. Town of Johnston average salary is 5 percent lower than USA average and median salary is 1 percent higher than USA median salary. From 2019 to 2020, the average salary of employees at this employer increased 2.0 percent.