Before you can submit official U.S. documents issued by the U.S. authorities or notarized by U.S. public notaries to Latvia's official institutions, they must be authorized with a special Apostille certification. Usually you can obtain the Apostille certification in the Offices of the Secretary of State where the document originally was issued or notarized.
The certification is requested in accordance with the Convention Abolishing the Requirement of Legalization for Foreign Public Documents (concluded October 5, 1961).
For detailed information on how and where to authorize your U.S. documents with an Apostille, visit USA-Competent Authority (Scroll down to Section III: Officers of the individual States and other subdivisions as indicated:)
Each state has its own requirements. The fees charged by individual U.S. states vary. The average fee for apostilles is approximately $10.
As from July 1, 2019 certification with Apostille of documents issued in Latvia is carried out by sworn notaries.
Information on service:
Phone number +371-24202100
The validity of an Apostille made by sworn notary of the Republic of Latvia (issued starting from July 1, 2019) can be checked here: https://www.latvijasnotars.lv/apostille/verify