United States – offices in China

US postal services were established in the US consulate in Shanghai in 1867. In 1907, the agency office was move to a separate location. Then-current US postage stamps were used, cancelled with (mostly) standard types used in the US, typically reading "U.S. Postal Agency Shanghai". A machine flag cancel was even used there.

In 1913, postal agent John Darrah overprinted various US stamps including parcel posts, registration and postage dues including parcel post dues. These overprints read SHANGHAI / CHINA in sans-serif letters. They were used, postally and philatelically, for a short time until the Post Office Department became aware of them and banned their use.

In 1919, surcharges on contemporary (contemporaneous?) US Washington-Franklin definitives were issued, reading SHANGHAI / CHINA with the new value between. That value was in Chinese currency, the equivalent of US face value of each stamp at the time. In 1922, a US 1c and a 2c value were overprinted in a similar style in sans-serif type with the Chinese value between, expressed as "Cts".

The US Shanghai post office was closed in December 1922. Stamps were available for a short time afterward through the philatelic agency in Washington, DC.  File:US off in Chi Darrah.jpg|1913 1c Darrah overprint File:US off in Chi 60c.jpg|1919 60c on 30c value File:Us off in Chi 2c 1922.jpg|1922 2c on 1c value 