Area Code 321

About Area Code 321

Area code 321 is a geographic telephone area code assigned to Melbourne, Florida. It operates in the Eastern time zone and was first introduced in 1999. Split from 407. East Florida coast including Cape Canaveral.

Within Florida, area code 321 shares numbering capacity with 17 other area codes. The state's 22,610,726-person population (2023 Census Bureau estimate) is served by a combined 18 active codes, with 321 primarily responsible for the Melbourne region. Florida's state capital is Tallahassee, and its largest city is Jacksonville.

When you receive a call from a 321 number on your Caller ID, the call originated from a phone number assigned to the 321 area code — but be aware that Local Number Portability (in effect since 2003) means the caller could be physically located anywhere in the US or Canada. Area code 321 only confirms where the number was originally assigned.

Where is the 321 area code located?

Area code 321 is assigned to Melbourne, Florida, in the Eastern time zone. The state of Florida uses 18 active area codes, and 321 is one of them. Calls placed from the 321 area code originate from numbers assigned by NANPA — the North American Numbering Plan Administrator — and the 321 prefix appears on Caller ID for both landline and wireless calls placed from this region.

The Eastern time zone observes Daylight Saving Time, shifting from UTC-5 to UTC-4 in summer. The local time shown above is always current, so you can quickly check whether it's a reasonable hour to call back.

What cities and counties use the 321 area code?

The 321 area code serves 10 notable cities, listed below in order of population. The largest city in the 321 territory is Jacksonville (971,319 residents in Duval County).

• Jacksonville, FL — 971,319 residents (28.5% of 321 numbers)
• Miami, FL — 442,241 residents (13% of 321 numbers)
• Tampa, FL — 398,173 residents (11.7% of 321 numbers)
• Orlando, FL — 309,154 residents (9.1% of 321 numbers)
• St. Petersburg, FL — 261,328 residents (7.7% of 321 numbers)
• Hialeah, FL — 220,490 residents (6.5% of 321 numbers)
• Tallahassee, FL — 201,731 residents (5.9% of 321 numbers)
• Fort Lauderdale, FL — 182,434 residents (5.4% of 321 numbers)
• Port St. Lucie, FL — 217,522 residents (6.4% of 321 numbers)
• Cape Coral, FL — 204,510 residents (6% of 321 numbers)

Phone number format in area code 321

All phone numbers within area code 321 follow the standard North American 10-digit format:(321) NXX-XXXX. The NXX is the central office prefix (also called an "exchange") and XXXX is the subscriber line number. For long-distance calls within the NANP, dial 1 + 321 + NXX + XXXX. From outside North America, dial your country's international access code, then 1 (the NANP country code), then the 10-digit number.

If you need to verify whether a specific 321 number is wireless, landline, or VoIP, you can use our reverse phone lookup tool. Be aware that number portability means the area code no longer guarantees the caller's physical location — only where the number was first assigned.

History of area code 321

Split from 407. East Florida coast including Cape Canaveral.

The original 86 area codes were assigned by AT&T and Bell Labs in 1947 as part of the North American Numbering Plan. At the time, rotary-dial phones meant codes with lower digits (like 212 for NYC, 213 for LA, 312 for Chicago) were given to the largest cities because they took less time to dial. Today's area code assignments still reflect those early choices, even though touch-tone and cell phones made the original reason obsolete.

Is the 321 area code safe to answer?

Area code 321 itself is a normal geographic code with no elevated spam risk. That said, scammers can spoof any area code — including 321 — so if you don't recognize the full number, let it go to voicemail and verify the caller's identity before calling back.