The average custodian salary at Guymon Hs was $15,201 , which is 43 percent lower than the average salary for this job in Oklahoma, and 79 percent lower than the national average for this job . Custodian salaries at Guymon Hs typically range from $14,457 to $16,687 (25th to 75th percentile). The highest reported custodian salary was $16,687. There are 3 employees at Guymon Hs with the job title custodian.