Mongolia's embassy in Washington, D.C., the United States of America, concurrently accredited to Mexico. Mongolia's diplomatic missions abroad list records the post at 2833 M Street, NW, Washington DC 20007, with U.Batbayar as chief of mission (Consul.mn, diplomatic missions abroad list, dated 1 September 2024). In full Ulziidelger Batbayar, cited as Batbayar Ulziidelger in embassy reporting, he presented his Letter of Credence to the President of the United States on 1 December 2021 (Voice of Mongolia, 8 December 2021; Mongolia-United States relations). His profile records him as Ambassador Extraordinary and Plenipotentiary of Mongolia to the United States of America.
Mongolia and the United States established diplomatic relations in January 1987 (United States Senate resolution text, 111th Congress). The United States has become Mongolia's most important third neighbour, relations were upgraded to a Strategic Partnership in 2019, and on 2 August 2023 the two sides issued a Joint Statement on the Strategic Third Neighbor Partnership during Prime Minister L. Oyun-Erdene's visit to Washington (Joint Statement on the Strategic Third Neighbor Partnership, 2 August 2023; U.S. Relations With Mongolia, U.S. Department of State, 17 February 2025).