Question: Which U.S. state was the first to have a ZIP code?
Answer: Massachusetts was the first state to receive a 5-digit zip code, with Agawam assigned 01001 in 1963, making it the second town in the U.S. to have one. Adjuntas, Puerto Rico, received the first 5-digit zip code, 00601, marking the start of the modern U.S. zip code system.
