Monaco and the United States exchanged consular officials soon after the end of the United States Civil War. The first consul from Monaco to the US was Louis Borg, who presented his credentials in May 1866. In 1897 it was estimated that this consulate in New York served less than half a dozen citizens of Monaco (with around 40 in the entire USA in 1901 ), and supported no extensive commerce. Derisive commentary at the time suggested that the primary role of maintaining the unpaid consul was to provide a reception for Monaco's navy of one steam ship. The first US consular agent was Emile de Loth, accredited in February 1874, but this post was closed and moved to Nice in 1906.
Until 2006 Monaco's only career Consul-General (Maguy Maccario-Doyle in 2006) operated out of New York, but directed all the Honorary Consuls in placements worldwide.
In December 2006, the United States and Monaco upgraded from consular to full diplomatic relations. Shortly thereafter, Craig Stapleton (ambassador to France) was accredited to Monaco, and ambassador Gilles Noghes became the first Monegasque ambassador to the United States. In 2009 Stapleton was replaced by Charles Rivkin. The United States does not yet have a diplomatic mission located in Monaco but there is an embassy in Paris, and a consulate general in Marseille. On December 3rd 2013, Her Excellency Maguy Maccario Doyle replaced Noghes as the Principality's new emissary to Washington DC following her appointment by His Serene Highness Prince Albert II of Monaco. Ambassador Maccario Doyle is the first woman to hold the post at the Embassy.