USPS customer service official

Сustomer phone support: 1-800-ASK-USPS® (1-800-275-8777)
USPS website http://www.usps.com
online mailing form USPS

tracking usps number formats:
UPS Tracking® 00 9400 1000 0000 0000 0000
Priority Mail® 00 9205 5000 0000 0000 0000
Certified Mail® 00 9407 3000 0000 0000 0000
Collect on Delivery 9303 3000 0000 0000 0000 00
Global Express Guaranteed® 82 million 00
Mail Express International Priority ™ EC 000 million US
Priority mail Express ™ 9270 1000 0000 0000 0000 00, EA 000 million US
Priority mail International® CP 000 million US
Mail List ™ 9208 8000 0000 0000 0000 00
Signature receive ™ 9202 1000 0000 0000 0000 00

Link download Usps Tracking: http://uspstrackingus.com/

See more:

Usps Tracking : Privacy Act Statement

Something about Usps Tracking

USPS TRACKING SERVICE