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610 Day, or June 10, is also known as “610 Day,” which is a nod to the 610 area code. For a lot of us, 610 still feels like the Lehigh Valley area code, even though it came after the 215 days and before 484 entered the chat.

A little phone-number history: 610 was placed into service in January 1994 after being split from the 215 area code, which had covered much of southeastern Pennsylvania since 1947. The 484 overlay was introduced in June 1999 for the same region, which meant 10-digit dialing became part of local life. Today, 610 and 484 cover the same general region, which includes the Lehigh Valley, with 835 also added in 2022.