How To Write Address With Apartment Number Usa Reddit . Oh, so the block number and street name are not on the same line and it's not necessary to include hdb? You can use the third line for your city, state, and zip code. Usps Address Format On Envelope from borg-net.eu There are no abbreviations in quadrant abbreviations, unless it is customary locally. Your name goes on the top line. So it's fine to put 111 streetname all into box 1.