Addressing and Delivery Information
What candidates must know
This domain tests how mail is addressed, how addresses are read, and how address data drives delivery. Core concepts: the components of a complete delivery address (primary address number, predirectional, street name, suffix, postdirectional, secondary unit designator such as APT or STE, city, state abbreviation, ZIP Code, and ZIP+4); the role of the ZIP Code in sorting and routing; standardized address formats and abbreviations; and the difference between a mailing address and a physical delivery point. Understand that ZIP+4 adds precision beyond the five-digit ZIP and that carriers use address information, not names, to route mail.
Traps in questions
Watch for items that confuse a return address with a delivery address, or that treat a missing secondary unit as harmless when it can cause non-delivery in multi-unit buildings. Questions often present an address with an incorrect or missing directional or suffix and ask what is wrong. Another trap: assuming a name alone can route mail - it cannot. Also distinguish "address correction" from "address change": a customer moving must submit a change-of-address; a carrier noting a better address is a correction.
Rule of thumb
Read an address left to right, most specific to least specific: number, street, unit, city, state, ZIP. If any required element is missing, the address is incomplete and delivery may fail.
Worked example
"John Smith, 142 N Main Strt Apt 3B, Springfield IL" lacks a ZIP Code and misspells the suffix. The corrected form adds "ST" for Street and a ZIP Code; without the ZIP, sorting and routing cannot complete reliably.