The average aide salary at Cosmopolis was $17,176 , which is 48 percent lower than the average salary for this job in Washington, and 47 percent lower than the national average for this job . Aide salaries at Cosmopolis typically range from $13,391 to $19,322 (25th to 75th percentile). The highest reported aide salary was $24,717. There are 8 employees at Cosmopolis with the job title aide.