Publication 632 - State and Local Election Mail — User’s Guide - Contents How Quickly You Need the Pieces Delivered Most First-Class Mail is delivered within 1–5 days. Most USPS Marketing Mail a..." /> Publication 632 - State and Local Election Mail — User’s Guide - Contents How Quickly You Need the Pieces Delivered Most First-Class Mail is delivered within 1–5 days. Most USPS Marketing Mail a..." />