Area Code 305
Florida
Area code 305 serves Florida, primarily Miami, in the Eastern Time (ET) time zone. It has served the region since 01-Jan-1947.
Published: Last reviewed: Verified against NANPA and FCC records
Overlay Area Codes
This area code shares its geographic footprint with 2 overlay codes, so the same cities are served by multiple area codes. Because overlays leave existing numbers untouched, this region's relief planning favors adding codes over redrawing boundaries.
The codes serving this same region: area code 645 (Miami), area code 786 (Miami).
With prefix utilization already at 98.1%, numbering resources here are under sustained pressure — context that explains why overlays were introduced.
In service since: 01-Jan-1947
Area Code Splits
2 area codes have been carved out of this code's original territory through geographic splits. Each split was a relief action: as demand grew, part of the region was reassigned to a new code rather than overlaying the whole territory.
Split into: area code 407 (Orlando), area code 954 (Fort Lauderdale).
Demographics & Economics
- Total Population
- 2,711,261
- Population Density
- 1,087 people/sq miabove U.S. average (U.S.: 95 people/sq mi)
- Median Household Income
- $71,753below U.S. median (U.S.: $80,734)
- Poverty Rate
- 14.6%above U.S. average (U.S.: 12.5%)
- Unemployment Rate
- 4.6%below U.S. average (U.S.: 5.2%)
- Education Attainment
- Bachelor's Degree+34.5%near U.S. average (U.S.: 35.7%)High School or Lower34.6%
Statistics are population-weighted aggregations from Census ACS 5-year estimates. Population figures are approximate — see Sources & Methodology for details on how area code populations are derived.
See how this area code compares to all US area codes in the income ranking and density ranking.
Time Zone
- Eastern Time (ET)
NANPA Relief Status
According to the latest NANPA analysis (July 2026), this area code is not currently listed as exhausting within the next 36 months. No relief planning is in progress for this NPA.
Source: NANPA NPA Relief Planning Reports · See all relief planning statuses
Current Time
Prefix Utilization
Geographic Coverage
State
FL
Major Cities
- Miami
- Hialeah
- Miramar
- Miami Gardens
- Miami Beach
- Homestead
- Kendall
- Doral
- North Miami
- The Hammocks
- Fountainebleau
- Westchester
- Kendale Lakes
- Tamiami
- Country Club
- Coral Gables
- Cutler Bay
- North Miami Beach
- Princeton
- Aventura
- South Miami Heights
- Richmond West
- Kendall West
- Golden Glades
and 65 more cities
Historical Timeline of Area Code 305
Area code 305 is one of the original 77 US NANP area codes established on January 1, 1947, when AT&T's National Numbering Plan launched. Originally covering the entire state of Florida, 305 used the middle digit "0" — encoding full-state status under the original NANP rules. Over 48 years, it underwent four geographic splits — more than virtually any other US area code — before settling as Miami's signature identifier. Source: NANPA
Key milestones:
- January 1, 1947: Area code 305 established as one of the original 77 US area codes, covering the entire state of Florida from the Panhandle to the Keys. Source: NANPA
- 1953: First split — area code 813 created for the Tampa Bay area and western peninsula, driven by direct distance dialing (DDD) growth. General Telephone (GTE) serviced much of the split territory. 305 retained eastern Florida. Source: NANPA
- July 6, 1965: Second split — area code 904 carved out for North Florida, from the Panhandle to Jacksonville. Mandatory dialing began January 1, 1966. Source: NANPA
- April 16, 1988: Third split — area code 407 assigned to Central and east coast Florida (Palm Beach through Brevard counties and Orlando metro). Bellcore issued Information Letter IL-87/03-033 in March 1987. Permissive dialing continued through June 18, 1988. 305 reduced to Broward, Miami-Dade, and Monroe counties. Source: Florida PSC
- September 11, 1995: Fourth split — area code 954 carved out for Broward County. Two Fort Lauderdale men sued to stop the change, claiming Broward would become "a desert, an economic wasteland, a Third World Town." A compromise allowed Broward businesses to keep 305 numbers via remote call forwarding. The transition saw a famous TV ad blunder — people dialing 800 instead of 888 reached an adult phone service. Source: Miami Herald
- March 1, 1998: Area code 786 installed as a concentrated overlay on 305 for Miami-Dade County only. Monroe County was excluded — the first time in NANP history an overlay was limited to part of a numbering plan area. Mandatory 10-digit dialing began July 1, 1998. Source: NANPA
- September 1, 2001: Monroe County (Florida Keys) added to the 786 overlay area. Source: NANPA
- April 18, 2015: Mandatory 10-digit dialing extended to the Florida Keys. The Florida PSC's number conservation measures delayed this overlay need by 14 years from the original 2001 exhaust estimate. Source: Florida PSC
- August 4, 2023: Area code 645 activated as the third overlay for the 305/786 region. PSC Chairman Andrew Fay noted this was "only the second time Florida has added a third area code to a region since 1947." All three codes (305, 786, 645) now serve Miami-Dade and Monroe counties. Source: EIN Presswire
Regulatory History
Area code 305 has been shaped by every major regulatory framework in American telecommunications — from AT&T's original NANP in 1947 to the FCC's delegation to state commissions and the Florida PSC's number conservation victories. Source: FCC
| Year | Event | Docket | Regulatory Action & Impact |
|---|---|---|---|
| 1947 | NANP Inception | AT&T / Bell System | AT&T established the National Numbering Plan, creating 77 area codes. Area code 305 assigned to all of Florida. Middle digit "0" encoded full-state coverage under original NANP rules. Bellcore, which later administered the NANP as NANPA, was not established until the 1984 AT&T divestiture. Source: NANPA |
| 1953 | 305/813 Tampa Bay Split | AT&T / Bell System | First geographic split from 305. With the development of direct distance dialing (DDD), the western peninsula from the Tampa Bay area south — serviced mostly by General Telephone (GTE) — was designated as a separate numbering plan area with area code 813. 305 retained eastern Florida. Source: NANPA |
| 1965 | 305/904 North Florida Split | AT&T / Bell System | Second geographic split from 305. North Florida from the Panhandle to Jacksonville assigned area code 904. Permissive dialing began July 6, 1965; mandatory dialing began January 1, 1966. Source: NANPA |
| 1987 | 305/407 Split Authorization | NANPA (Bellcore) | Information Letter IL-87/03-033 authorized the split of 305, creating area code 407 for Central and east coast Florida. Split effective April 16, 1988 with permissive dialing through June 18, 1988. 305 reduced to Broward, Miami-Dade, and Monroe counties. Source: Florida PSC |
| 1995 | 305/954 Broward Split | NANPA | Fourth and final geographic split from 305. Broward County split from 305, assigned area code 954, effective September 11, 1995. One-year transition with permissive dialing. A negotiated compromise allowed Broward businesses to retain 305 numbers via remote call forwarding. Source: Florida PSC |
| 1996 | Telecommunications Act | FCC / Congress | Telecommunications Act of 1996 gave the FCC jurisdiction over telephone numbering, then delegated authority for new area code decisions to state regulatory commissions. This shift enabled state-level number conservation measures that proved critical for 305. Source: Florida PSC |
| 1998 | 786 Concentrated Overlay | NANPA / Florida PSC | Planning Letter PL-NANP-116 authorized 786 as a concentrated overlay on 305 for Miami-Dade County only — an unusual limited-scope overlay. Monroe County excluded initially. Mandatory 10-digit dialing began July 1, 1998. Source: Florida PSC |
| 1999 | 305 Jeopardy Declaration | NANPA | NANPA declared jeopardy for the 305 NPA, rationing new numbering resources and freezing non-essential NXX assignments. This triggered conservation measures that would later extend the area code's life by 14 years. Source: Florida PSC |
| 2000 | PSC Conservation Measures | Florida PSC | PSC approved number conservation measures including thousands-block number pooling, utilization thresholds, and rate center consolidation. These measures delayed Monroe County's 305 exhaust from Q3 2001 to Q2 2015 — a 14-year extension, one of the longest in NANP history. Source: Florida PSC |
| 2001 | Keys Implementation Delayed | Florida PSC | PSC Order PSC-01-1456-PCO-TL approved permissive 7/10-digit dialing for August 1, 2001, but deferred mandatory implementation pending conservation measure results. Monroe County was added to the 786 overlay on September 1, 2001. Source: Florida PSC |
| 2014 | Keys Exhaust Forecast | NANPA / Florida PSC | NANPA notified the PSC that the 305/786 numbering plan area exhaust date was revised to Q2 2015. PSC Docket 140116-TP led to Order PSC-14-0375-PAA-TP, setting mandatory 10-digit dialing for April 18, 2015 and 786 overlay extension for June 1, 2015. Source: Florida PSC |
| 2021 | 305/786 Jeopardy | NANPA / Florida PSC | NANPA declared jeopardy for the 305/786 overlay on September 23, 2021, with only 4 CO codes/month available. PSC Docket 20210190-TP initiated interim rationing and relief planning. Source: NANPA |
| 2022 | 645 Overlay Approved | Florida PSC | PSC Order PSC-2022-0050-PAA-TP approved an all-services distributed overlay for the 305/786 region. NANPA Planning Letter PL-588 (April 14, 2022) assigned area code 645. PSC Chairman Andrew Fay noted this was "only the second time Florida has added a third area code to a region since 1947." Source: Florida PSC |
| 2023 | 645 Overlay Activated | Florida PSC / NANPA | Area code 645 activated August 4, 2023, before the anticipated exhaust of central office codes in 305 and 786. New 645 numbers issued only after all assignable CO codes in 305/786 are exhausted. Source: NANPA |
County Coverage
Population-weighted county share based on aggregated ZCTA population (100% = total mapped population for area code 305).
| County | Population | Share |
|---|---|---|
| Miami-Dade, FL | 2,657,108 | 98.0% |
| Monroe, FL | 54,153 | 2.0% |
Area Code 305 Family Tree
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All Descendants
Area code 305 was originally assigned in 01-Jan-1947 to serve FL. Over the years, it has generated 10 descendant area codes through a combination of geographic splits and overlays as demand for telephone numbers grew.
Call Context
This area code serves a major metropolitan region with high population density in FL. The primary city is Miami.
Nearby Area Codes
Area codes geographically closest to 305.
Other Area Codes in Florida
Area codes that also serve Florida, linked for easy comparison.