Nationwide Statistics
Glassdoor.com  (Obtain access by emailing  students@glassdoor.com for a password.)
Salary Search - Indeed.com
PayScale
Salary Calculator - NACE
salary.com
Salary Guides & Guidance - The Riley Guide
Salary Surveys for NonProfit Sector - Idealist.org
Wages by Occupation and Local Area - careeronestop

Statistics - Specific Fields
Design & Marketing Salaries - Creative Group
Finance & Accounting Salaries - Robert Half
Technology Salaries - Robert Half
Administrative Salaries - Office Team

South Carolina Statistics
Occupational Employment and Wage Estimates   - SC Department of Employment and Workforce