Postal Rate Commission
US Post Office
PO
Post Office
United States Post Office
third-class mail
third class
USPS
United States Postal Service
US Postal Service
post office
local post office
snail mail
registered post
registered mail
mail
special delivery
accountable mail
postmaster general
shipping
US Postal Inspection Service
United States Postal Inspection Service
provisional
prephilately
Postmaster General
express mail
express
mails
postroad
parcel post
flaps and seals
fiscal stamp
tax stamp
freepost
recorded delivery
Meghdoot card
RFD
dead letter office
rural free delivery
zip code
poste restante
postal note
postbox
letter box
mailbox
star route
semi-postal stamp
charity stamp
US Government Printing Office
GPO
Government Printing Office
United States Government Printing Office
philately
postmark
post town
open rate
e-mailbox
postage meter
PO box number
box number
call box
PO Box
letter-stamp
Post-Office box
POB
PO Box No
packet-boat
post-office box number