Riga Post Office
Whether you need stamps for your postcards or to receive a fax from your grandmother, rarely does one not need a post office during their trip. The main post office of Riga (or Latvijas Pasts - no, that's not a sign for a time travel service, it's just a post office) is at Stacijas laukums 1, but there are dozens of locations throughout the city - just look for the yellow envelope.
Gene Webb from United States Reply
I would like to contact the Post Office Inquiries Section about a registered letter that was sent on the 19th July, but unable to see the Postal Addresses in Latvia,in the sites I have visited. I do not live in the U.S. but you do not have my country listed. I live in the Cayman Islands