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Treaty of Washington (1805), between the Federal government and the Creek National Council

Treaty of Washington (1826), between the Federal government and the Creek National Council led by Opothleyahola.

Treaty of Washington of 1836, a U.S.-Native American (Ottawa and Chippewa) treaty

Webster-Ashburton Treaty of 1842. It settled the border dispute between Canada and the Eastern States, such as Maine and Vermont. It helped to end the slave trade.

The Oregon Treaty of 1846, which established the US-British frontier west of the Rocky Mountains (today's US-Canada boundary)

Treaty of Washington of 1858, between the U.S. and Dakota

The Treaty of Washington of 1871, a general agreement between the United States and the British Empire

The International Meridian Conference of 1884 in Washington DC, establishing the Greenwich Meridian, the world time zone system and the universal day as international standards

The Washington Naval Treaty of 1922 that limited naval armaments

The North Atlantic Treaty of 1949 that created NATO

The Convention on the International Trade in Endangered Species (CITES)