The average aide salary at Union Middle was $43,042 , which is 86 percent higher than the average salary for this job in Missouri, and 33 percent higher than the national average for this job . Aide salaries at Union Middle typically range from $13,160 to $59,575 (25th to 75th percentile). The highest reported aide salary was $102,542. There are 7 employees at Union Middle with the job title aide.