These sites will allow you to enter information and find out about salary issues.

• GlassDoor - http://www.glassdoor.com/Salaries/index.htm
• PayScale.com - www.payscale.com    
• Salary.com - www.salary.com
• Salary Expert.com - www.salaryexpert.com
• Intuit (They pull salary info from people's tax returns.) - https://mint.intuit.com/salary/
  
• http://www.areavibes.com/salary-calculator/
• US Bureau of Labor Statistics - https://www.bls.gov/bls/wages.htm