What is progressive 5 digit code for PA?

A progressive 5-digit code for Pennsylvania (PA) generally refers to the state's ZIP codes, which range from 15001 to 19640. These codes are used to identify specific geographic areas for mail delivery. For example, a progressive sequence might start with 15001 for the area of Aliquippa and continue sequentially through various towns and cities in the state. Each ZIP code corresponds to a particular location within Pennsylvania.