We get questions pretty regularly about how to send to locations with strange addresses layouts. Military bases and foreign countries with no zip code or no states are common.
Military bases will have an APO/FPO/DPO Designation, this should always go in the City space.
Military bases will also always have an AE/AP/AA which should replace the state.
Lastly the Country should always be set to United States no matter where the base is since military bases are always considered US Soil.
In many cases foreign countries do not have a state or don't use a zip code. In these cases you can enter "xx' into the space to designate to the Post Office that there IS nothing for that space
Multiple Street lines:
If you have multiple street lines and are unsure which should go first, you can figure out 95% of the time by being aware that the post office requires the first line to ALWAYS be the Street/Ave/Road/Trail/Lane designation. ie. "14827 SW Bush St" would go in Street1 while "Shady village Unit 5" will usually go "street2"