Area code 645

Area code 645 at a glance

645 is one of 23 geographic area codes serving Florida; NANPA records its in-service date as August 4, 2023. It is an overlay: 645 and 305 and 786 cover the same territory, so neighbors on the same street can have different area codes. It is in the Eastern time zone. The places with the most assigned exchanges include Miami and Homestead.

Places served by 645

645 holds 0.70% of the 11,187 central office codes assigned in Florida, the 21st most of the state's 23 codes. 2 Census places could be matched to rate centers with 645 exchanges; the most populous are Miami (487,000) and Homestead (85,796). Each place page lists the exact prefixes and carriers for that town.

How calls are dialed in 645

According to NANPA's dialing-plan data, local calls within 645 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits. Because local calls need the area code, business cards, signage and website copy should always show the full ten-digit number. NANPA's dialing-plan note for this code reads: "1+10 permissive dialing at service provider discretion"

Carriers with 645 numbers

19 carriers hold the 78 central office codes assigned in 645. New Cingular Wireless PCS, LLC - Ga has the most, with 17 (22%). 76 of the codes (97%) are pooled, meaning the code holder shares blocks of 1,000 numbers with other carriers instead of using all 10,000 itself. The code holder is not necessarily the carrier serving a given number today, since numbers can be ported between providers.

Where 645 numbers are rated

NANPA assigns each central office code to a rate center, the local calling area that decides whether a call is local or toll. 645 has codes in 5 rate centers. Rate center names in the file are abbreviations; where one matches a Census place, the table links to that city's local-number page.

How full is area code 645?

An area code has 800 possible central office codes that start with 2 through 9, a few of which are reserved (such as N11 service codes and 555). 78 are assigned in 645, 9.8% of 800. 78 were assigned in 2020 or later.

Getting a 645 number for your business

Callata Office costs $99 per month for up to 5 people, and each additional user is $20 a month. That covers up to 3 local numbers, calling from a browser or your cell, transcribed voicemail, recorded calls with AI summaries, after-hours routing and E911 on each number.

Porting a number you already use in area code 645 is free, and business texting is available once the carrier registration (10DLC) is approved; the registration carries a one-time $49 fee. Which specific numbers are open in a given area code depends on carrier inventory at the time you sign up.

AI agents are optional: an AI receptionist or scheduler can pick up when the team is busy or closed, take a message, send a text or email, or transfer the call. They draw on prepaid AI minutes ($0.25/minute), disclose that they are AI, and outbound AI calls require prior consent and are limited to 8am–9pm.