Treaty with the Hawaiian Island -- December 23, 1826  Treaty with the Hawaiian Island -- December 20, 1849 Treaty with the Hawaiian Island -- January 13, 1875 Convention -- US Post Department -- September 11, 1883  Treaty with the Hawaiian Island -- December 6, 1884
	English Treaty -- November 16, 1836 British Treaty -- March 26, 1846
	French Convention -- July 17, 1839 Postal Convention - Tahiti -- November 24, 1853
	Treaty with Denmark -- October 19, 1846 Agreement -- January 25, 1848
	Treaty with Hamburg -- January 8, 1848 Agreement -- January 25, 1848
	Treaty with Bremen -- March 27, 1854
	Treaty with Sweden and Norway -- April 5, 1852
	Treaty with Sweden and Norway -- April 5, 1852
	Treaty with Belgium -- October 4, 1862
	Treaty with the Netherlands -- October 16, 1862
	Treaty with Italy -- July 22, 1863
	Treaty with Spain -- October 9, 1863
	Treaty with the Swiss Confederation -- July 20, 1864
	Treaty with Russia -- June 19, 1869
	Treaty with Japan -- August 19, 1871
	Postal Convention - New South Wales -- July 1, 1874
	Treaty with the German Empire -- March 25, 1879
	Provisional Convention - Portugal -- May 5, 1882
	Rules - Hong-Kong -- December 13, 1884
	Treaty with Samoa -- March 21, 1887
Universal Postal Union	Additional Act of Lisbon to the Convention --March 21, 1885