Highest salary at Castro County in year 2021 was $171,309. Number of employees at Castro County in year 2021 was 74. Average annual salary was $32,540 and median salary was $34,935. Castro County average salary is 31 percent lower than USA average and median salary is 20 percent lower than USA median salary. From 2020 to 2021, the average salary of employees at this employer increased 10.4 percent, the median salary increased 6.9 percent.