The average cook salary at San Mateo County was $75,268 , which is 23 percent higher than the average salary for this job in California, and 98 percent higher than the national average for this job . Cook salaries at San Mateo County typically range from $28,457 to $110,845 (25th to 75th percentile). The highest reported cook salary was $136,619. There are 20 employees at San Mateo County with the job title cook.