The average admin asst salary at Downey was $78,231 , which is 17 percent lower than the average salary for this job in California, but 45 percent higher than the national average for this job . Admin Asst salaries at Downey typically range from $65,752 to $89,744 (25th to 75th percentile). The highest reported admin asst salary was $89,744. There are 3 employees at Downey with the job title admin asst.