The National Conference Center Contact Information www.conferencecenter.com About our Company The National Conference Center, located just 12-miles from Dulles Airport and 35-miles from Washington, DC NCC offers 917 guestrooms and 250 meeting rooms in a premier meeting environment. Our Complete Meeting Package is priced under per diem and includes: overnight guest room, meeting space, 3 meals daily, breaks, free parking, fitness center and more.