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