In search of my lost bestfriends in the US

I have lost contact with my 2 years long distant friends. Must been wondering why i want to find them, it is because they were the ones who were there for me when no one wasnt. They helped me build my character to who i am today, and i simply want to find them for i am grateful for their presence and companion. All i know is they lived in the US, Washington , D.C. I dont know of their sudden disappearance, but it is important to me. I have been wanting to get to them since 2015. Its been 2 years now, almost 3. I would appreciate if you guys would help me fund for my journey to find basically my life savers.