General
Menschenrecht und Transsexualität – .mutig (mut23.de)
Deutsche Gesellschaft für Transidentität und Intersexualität e.V. – dgti (dgti.org)
Klinik Sanssouci (kliniksanssouci.de)
Legal
In 2018, Germany allowed citizens to choose from three gender markers on their passports. Because some foreign countries do not recognize more than two genders, you need to consider carefully before choosing this option.
Bundesministerium des Innern, für Bau und Heimat (bmi.bund.de)
German missions abroad (auswaertiges-amt.de/en/aamt/auslandsvertretungen)
German citizens living outside Germany may contact the local consulate or embassy for more information. In the United States, Germany has these in Atlanta, Boston, Chicago, Houston, Los Angeles, Miami, New York, San Francisco, and Washington DC (embassy).