The average auxiliary salary at Marfa Isd was $21,506 , which is 11 percent lower than the average salary for this job in Texas, but 500 percent higher than the national average for this job . Auxiliary salaries at Marfa Isd typically range from $17,388 to $27,600 (25th to 75th percentile). The highest reported auxiliary salary was $31,416. There are 15 employees at Marfa Isd with the job title auxiliary.