Library Assistant salary at County of San Mateo

The average library assistant salary at County of San Mateo was $32,981 , which is 45 percent lower than the average salary for this job in California, and 6 percent lower than the national average for this job . Library Assistant salaries at County of San Mateo typically range from $19,172 to $43,495 (25th to 75th percentile). The highest reported library assistant salary was $67,090. There are 103 employees at County of San Mateo with the job title library assistant.