The average custodial salary at Gilmer Isd was $22,721 , which is 14 percent lower than the average salary for this job in Texas, and 31 percent lower than the national average for this job . Custodial salaries at Gilmer Isd typically range from $19,721 to $24,096 (25th to 75th percentile). The highest reported custodial salary was $38,580. There are 24 employees at Gilmer Isd with the job title custodial.