What cities are covered by the 904 area code?

I know the 904 area code is somewhere in Florida, but I’m not sure exactly which cities it includes. Does it mainly cover Jacksonville or are there smaller nearby towns using it too?

The 904 area code is definitely centered around Jacksonville, but it covers a lot more than just the main city. It actually spans across the entire northeastern corner of Florida. If you look at a map, it includes historic places like St. Augustine and Fernandina Beach, along with growing suburban spots like Orange Park, Jacksonville Beach, and Ponte Vedra Beach. Even smaller towns like Macclenny and Palatka fall under 904. If you want to check a comprehensive list of specific towns and prefixes, you can look here to see the full breakdown. It's a pretty large coastal region, so you'll hit 904 numbers all the way from the Georgia border down past St. Johns County.