Highest salary at Castro County in year 2023 was $64,697. Number of employees at Castro County in year 2023 was 79. Average annual salary was $30,366 and median salary was $34,241. Castro County average salary is 35 percent lower than USA average and median salary is 21 percent lower than USA median salary. From 2022 to 2023, the median salary increased 0.1 percent.