How do you mail a letter to japan?
Letters written in English arrive to Japanese addresses.
The format in Japanese is all one line...
The romanji (english alphabet) is in lines like our mailing address.
3-7-1-2 Nishi Shinjuku (３－７－１－２西新宿)
The initial numbers 3-7-1-2 are like our unit/house numbers and street name, the usual grouping is 3 but 4, like this one is not rare for big cities.
Nishi Shinjuku is like our suburb
Tokyo is the state
163-1055 is the postcode.
Some address have another line for the ward.
104-8-42 Kitta Ikebukuro
some endings are
-dai -cho -machi for suburb or town
-ku for ward (borough)
-shi for city
-to -do -fu -ken for prefecture (like a state)