Quick answer
The 645 area code serves Miami, Florida in the Eastern Time (ET) (UTC-5 / UTC-4 DST). Assigned in 2023, it covers Miami-Dade and Florida Keys including Miami, Hialeah, Miami Gardens. Overlay codes: 305, 786.
- Region
- Miami-Dade and Florida Keys, FL
- Time zone
- ET (UTC-5)
- Assigned
- 2023
- Population
- ~2,700,000
- Local time now
- · live
What is the area code for Miami?
The area code for Miami, Florida is 645, with overlay codes 305, 786 sharing the same geographic footprint. The 645 area code is a North American Numbering Plan geographic code assigned in 2023, covering the Miami-Dade and Florida Keys region. It serves approximately 2,700,000 residents on the Eastern Time (ET) (UTC-5 / UTC-4 DST).
All Miami area codes
Miami is served by 3 area codes across the metro area. 645 is the 2023 addition; the others were added as overlays or for surrounding suburbs.
Cities served by the 645 area code
The 645 area code covers 6 major cities and towns across the Miami-Dade and Florida Keys region (FL):
Businesses across Miami and surrounding cities use 645 numbers to project local presence and lift call answer rates. Industry studies of local presence dialing consistently report answer-rate gains of 20–40% over toll-free or out-of-area numbers — a caller ID that matches the recipient's region looks familiar and gets picked up.
645 area code time zone and business hours
The 645 area code is in the Eastern Time (ET) zone (UTC-5 / UTC-4 DST). Standard business hours in 645 run 9 AM to 5 PM ET.
If you're calling into 645 from a different time zone, factor in the offset. For example, an Eastern Time business calling 645 at 9 AM ET reaches Miami at local time — likely outside standard business hours.
History of the 645 area code
The 645 area code was introduced in 2023 when the North American Numbering Plan was first deployed. As Miami grew and number demand increased, overlay codes 305, 786 were added to serve the same geographic region — a common solution that avoids forcing existing subscribers to change their numbers.
- 1947 305 added to serve the same region
- 1998 786 added to serve the same region
- 2023 645 entered service
Is the 645 area code safe? Spam and scam calls
645 is a legitimate geographic area code for Miami — it is not a scam code or a premium-rate prefix, and a call from a 645 number is most likely a genuine local caller. The risk is not the area code itself but a tactic called neighbor spoofing: scammers fake their caller ID so an unwanted call appears to come from your own area code, because people answer familiar numbers more readily.
If you get an unexpected 645 call, a few signals point to a likely scam — a pre-recorded message, urgent pressure to act now, a demand for payment by gift card or wire transfer, or anyone asking for passwords, Social Security, or account numbers. Let suspicious calls go to voicemail, never share personal information, and report fraud to the FTC at reportfraud.ftc.gov. The FCC consumer guide on spoofing explains your rights under the Truth in Caller ID Act. A real Miami business will leave a clear voicemail and will not pressure you.
US carriers verify caller ID with the STIR/SHAKEN framework, which flags many spoofed numbers as "Spam Likely" before they ring. DialPhone 645 numbers are registered for STIR/SHAKEN attestation, so calls from your business are verified as genuine and reach customers without a false spam label. See the DialPhone guide to VoIP security for more.
Why get a 645 area code number for your business?
Getting a 645 number gives your business three measurable advantages over a toll-free or out-of-area number:
- Local trust signal. Customers in Miami recognize 645 as their home area code. Caller ID matching builds immediate credibility for service businesses, sales outreach, and patient communication.
- Higher answer rate. Calls from a familiar local area code are answered far more often than unknown or toll-free numbers — industry measurements of local presence dialing put the lift at 20–40%, which matters most for outbound sales, appointment confirmations, and time-sensitive service callbacks.
- Targeted marketing. Businesses serving Miami and the broader Miami-Dade and Florida Keys can advertise a local number across print, radio, billboards, and digital channels for higher conversion than a national 800 number.
For businesses in Miami and surrounding cities, top industries that benefit from local 645 presence include Hospitality, Real Estate, and Healthcare. DialPhone's AI receptionist is available for every 645 number — never miss a call, even after standard business hours.
How to get a 645 area code number
Setting up a 645 business number with DialPhone takes under 10 minutes:
- Sign up for a DialPhone plan. Choose any plan starting at $24/user/month. Free 14-day trial, no credit card required.
- Search available 645 numbers. Filter the DialPhone number inventory by area code, city, or pattern.
- Choose your number and configure. Assign your new 645 number to a user or team, set up call routing, voicemail, AI receptionist, and business SMS.
- Port your existing number (optional). Already have a 645 number? Free number porting in 2 to 5 business days with zero service interruption.
New to local numbers? The complete guide to getting a local phone number covers choosing the right area code, porting an existing line, and avoiding spam flags.
645 area code overlay codes
The Miami-Dade and Florida Keys region is served by multiple overlay area codes:
| Area Code | Coverage |
|---|---|
| 645 | Primary area code for Miami-Dade and Florida Keys, assigned 2023 |
| 305 | Overlay — same geography (assigned 1947) |
| 786 | Overlay — same geography (assigned 1998) |
All overlay codes serve the same Miami region. New subscribers may be assigned any available code; existing numbers retain their original prefix.
AI receptionist for 645 area code businesses
Every DialPhone 645 number includes optional AI receptionist coverage, available 24/7. The AI handles calls when your team is unavailable — answering common questions, booking appointments, routing urgent callers to on-call staff, and capturing voicemail with full transcription and intent tagging.
For businesses in Miami that handle high call volume, run extended hours, or need bilingual support (especially valuable in multilingual metros like Miami), the AI receptionist reduces voicemail backlog and improves first-call resolution.
All area codes in Florida
Florida has 23 active geographic area codes. The 645 area code is part of the same numbering plan as the codes listed below — calls between them are typically local within the state, depending on the carrier.
Nearby area codes
Related area codes in Florida and the Eastern Time (ET) region:
- 239 area code — Fort Myers, Florida
- 305 area code — Miami, Florida
- 321 area code — Orlando, Florida
- 352 area code — Gainesville, Florida
- 386 area code — Daytona Beach, Florida
- 407 area code — Orlando, Florida
All Florida area codes → · Browse all US area codes →
More area codes: ← 641 Mason City · 646 New York City →
How We Tested
DialPhone re-verifies every area code page every 90 days. Area code geography, timezone, and overlay data come from the official North American Numbering Plan Administration (NANPA) database. Pricing reflects the published DialPhone plan tiers — see the pricing page for current details. Number availability varies; check the DialPhone signup flow for live inventory in the 645 region.
What We Don't Like
- Number availability is finite. Popular Miami area codes can be inventory-constrained — request specific vanity patterns early.
- Porting timing varies. Most 645 ports complete in 2-5 business days; complex multi-line legacy contracts can take 7-10.
- HIPAA tier required for healthcare. The Core $24 plan doesn't include a BAA — healthcare users need Advanced ($34) or above.