POSTAL REORGANIZATION ACT‑P.L. 91‑375 SEC.403.

"General Duties: (c) In providing services and in establishing

classifications, rates, and fees under this title, the Postal Service shall

not, execpt as specifically authorized in this title, make any undue or

unreasonable discrimination among users of the mails, nor shall it grant any

undue or unreasonable preferences to any user."

Domestic Mail Manual. A010 General Addressing Standards 1.2(e) Address

Elements [01‑10‑2000] (5‑digit or ZIP+4) where required.

"ZIP Codes may be omitted from pieces mailed by the general public at the

single‑piece rates for First‑Class Mail and Standard Mail (A) and from

pieces bearing a simplified address...."

Keep in mind that Domestic Mail Manual. A010 General Addressing Standards

1.2(e) Address Elements [01‑10‑2000] (5‑digit or ZIP+4) where required

applies to only FIRST CLASS mail. Second, third and fourth class mail

require a ZIP Code because you are asking for a price reduction in the

postage. First class mailings are not asking for any benefit (price

reduction). You pay the full cost of postage with first class.

Use to have the snail mail address of the Post Master General at one time.

Too many moves. Got lost in the mess somewhere. Do have an old phone number

for the United States Postal Service, Consumer Affairs Department which is

(202) 268‑ 2284 with a old snail mail addressing of:

Room 5821

475 L Enfant Plaza SW

Washington DC 20260‑2200