Highest Plainfield City employee salary in year 2018 was $152,636. Plainfield City employees number in year 2018 was 409. Plainfield City average salary was $72,592 and median salary was $70,536. According to the last payroll, Plainfield City average salary is 3 percent lower than USA average and 3 percent lower than New Jersey state average. Plainfield City employee salaries are usually between $49,154 and $96,548. Top 10% of highest-earning employees have salaries ranging from $112,212 to $152,636. From 2017 to 2018, the average salary of employees at this employer increased 1.9 percent, the median salary increased 1.9 percent.