General Information

The U.S. Postal Service (USPS) ``snail mail'' address for Arecibo Observatory is:

                Arecibo Observatory 
                HC3 Box 53995 
                Arecibo 
                Puerto Rico, PR00612 
                U.S.A.

However, letters and parcels sent via ``courier services'' such as Fed-Ex, USPS, Airborne, etc., must use the physical address of the Observatory:

                Arecibo Observatory 
                Route 625 
                Bo. Esperanza 
                Arecibo 
                Puerto Rico, PR00612 
                U.S.A.

All telephones at the Observatory have extensions to the basic observatory number (787)-878-2612. The extension should be dialed when prompted by the recorded introduction. FAXes to the Observatory should be sent to (787)-878-1861.