This page provides information on the internship programs currently available in Fairfax County. FCPA offers both paid and unpaid internship opportunities.Interested applicants are encouraged to explore and apply for open internship opportunities. Principal Engineer (Project Coordinator) New. Apply to Real Estate Agent, Real Estate Assistant, Real Estate Analyst and more! Each year, the Real Estate Assessment Office appraises all real property in the City to determine its value for tax purposes. The goal is to make this entire experience mirror what it looks and feels like in the real world. Mason student Chase Brown created a fishing web page for the Fairfax County Park Authority as part of his internship. Apply to Sales Intern, Retail Sales Associate, Entry Level Sales Representative and more! Edelman Financial Engines offers investing and financial planning services, wealth management, retirement planning, and more.