South Florida (colloquially and locally known as SoFlo) is a geographic and cultural region that generally comprises Florida's southernmost counties, and is the fourth most populous urban agglomeration in the United States. It is one of Florida's three most common "directional" regions, the others being Central Florida and North Florida. It includes the populous Miami metropolitan area, the Everglades, the Florida Keys, and other localities. South Florida is the only part of the continental United States with a tropical climate.
As with all vernacular regions, South Florida has no official boundaries or status and is defined differently by different sources at different times. A 2007 study of Florida's regions by Ary Lamme and Raymond K. Oldakowski found that Floridians surveyed identified "South Florida" as comprising the southernmost sections of peninsular Florida. That area includes the Miami metropolitan area (generally defined as Miami-Dade, Broward, and Palm Beach counties), the Florida Keys included in Monroe county, and the interior region known as the Glades. Additionally, Southwest Florida, representing the state's southern Gulf Coast, has emerged as a directional vernacular region. Some respondents from as far northwest as the southern Tampa Bay area identified their region as being in South Florida rather than Southwest or Central Florida.  However, the University of South Florida, founded in 1956, is located in Tampa. At that time, prior to the changes quickly brought by the Florida Constitution of 1968, south Florida was much less important politically, and the term was used more loosely. Tampa is not considered part of south Florida.
Enterprise Florida, the state's economic development agency, identifies "Southeast Florida" as one of eight economic regions used by the agency and other state and outside entities, including the Florida Department of Transportation. Some entities alternately designate this region "South Florida".  Its definition includes much of the same territory as Lamme and Oldakowski's report (except the Gulf Coast and much of the interior Glades region) as well as additional area. It includes Monroe County (the Keys) and the three metropolitan counties of Miami-Dade, Broward, and Palm Beach.
The demographics of South Florida residents can be segmented as following:
|Population %||Place of Birth|
|32.2%||State of Florida|
|33.0%||Elsewhere in the U.S.|
|34.8%||Outside of the U.S.|
Over 87.2% of all foreigners residing in South Florida come from Latin America.
Largest cities in South Florida by population:
|City||2010 population ||2000 population||County|
|Port St. Lucie||164,603||88,769||St. Lucie|
|West Palm Beach||99,919||82,103||Palm Beach|
|Boca Raton||84,392||74,764||Palm Beach|
|Boynton Beach||68,217||60,389||Palm Beach|
|Delray Beach||60,522||60,020||Palm Beach|
The Miami accent is a regional accent of the American English dialect spoken in South Florida, particularly in Miami-Dade, Broward, Palm Beach, and Monroe counties. The accent was born in central Miami, but has expanded to the rest of South Florida in the decades since the 1960s. The Miami accent is most prevalent in American-born South Floridian youth.   
The Miami accent is based on a fairly standard American accent but with some changes very similar to dialects in the Mid-Atlantic (especially the New York area dialect, Northern New Jersey English, and New York Latino English.) Unlike Virginia Piedmont, Coastal Southern American, and Northeast American dialects, the "Miami accent" is rhotic; it also incorporates a rhythm and pronunciation heavily influenced by Spanish (wherein rhythm is syllable-timed). 
Lamme and Oldakowski identify several demographic, political, and cultural elements that characterize South Florida and distinguish it from other areas of the state. Many of its differences appear to be driven by its proportionately higher level of migration from the northern U.S. states and from the Caribbean and Latin America, particularly in the densely populated Miami area.  Politically, South Florida is more liberal than the rest of the state. While less than 10% of people in either North or Central Florida felt their area was liberal, over a third of South Floridians described their region as such.  38% characterized the area as conservative; 26% as moderate.  This tracks with South Florida's demographics, and Lamme and Oldakowski's findings parallel Barney Warf and Cynthia Waddell's research on Florida's political geography during the 2000 Presidential election.   The economy in South Florida is very similar to that in Central Florida. Compared to the more diversified economy in North Florida, tourism is by far the most significant industry in South and Central Florida, with a much smaller but vibrant agricultural industry. 
Lamme and Oldakowski's survey also found some cultural indicators distinguishing South Florida. South Florida is the only region of the state where ethnic foods are as popular as general American cuisine.  Additionally, while there was little geographical variation for most styles of music, there was regional variation for both country and Latin music. Country was significantly less popular in South Florida than in North or Central Florida, while Latin was more popular than in the other regions. 
The Anthony J. Catanese Center for Urban and Environmental Solutions at Florida Atlantic University notes the unusual growth pattern of South Florida. Unlike many areas with centralized cities surrounded by development, most of South Florida is preserved natural area and designated agricultural reserves, with development restricted to a dense, narrow strip along the coast. The developed area is highly urbanized and increasingly continuous and decentralized, with no particular dominant core cities. The center projects this pattern to continue in the future. 
Over time, there have been numerous proposals for partitioning the state of Florida to form a separate state of South Florida. Such proposals have usually been made as political statement rather than serious attempts at secession. Reasons often stated are cultural, ethnic, economic, and financial frustrations with the state government in Tallahassee, which is in North Florida. 
In 2014, the City of South Miami passed a resolution in favor of splitting the state in half, with a northern boundary drawn to include the counties of Brevard, Orange, Polk, Hillsborough, and Pinellas (roughly the Tampa Bay and Orlando areas). In total, the proposed State of South Florida would have included 24 counties.   
- Miami metropolitan area
- United States metropolitan area
- Table of United States Metropolitan Statistical Areas
- Lamme & Oldakowsi, p. 329.
- "Charting the Course" uses "the term 'Southeast' Florida interchangeably with 'South' Florida" for this region; p. 3.
- Bureau of Economic and Business Research (2011). "Florida Population: Census Summary 2010". University of Florida.
- Haggin, Patience. "Miami Accents: Why Locals Embrace That Heavy "L" Or Not". Wlrn.org. Retrieved 10 July 2018.
- Watts, Gabriella. "Miami Accents: How 'Miamah' Turned Into A Different Sort Of Twang". Wlrn.org. Retrieved 10 July 2018.
- "English in the 305 has its own distinct Miami sound - Lifestyle - MiamiHerald.com". Miamiherald.com. Retrieved 10 July 2018.
- "'Miami Accent' Takes Speakers By Surprise". Articles – Sun-Sentinel.com. June 13, 2004. Retrieved 2012-10-08.
- Lamme & Oldakowsi, p. 330.
- Lamme & Oldakowsi, p. 336.
- Warf & Waddell, pp. 88.
- Lamme & Oldakowsi, pp. 336–337.
- Lamme & Oldakowsi, p. 337.
- "Charting the Course", p. 3.
- Morelli, Keith (May 8, 2008). "2 Broward Cities Plant Seeds of Secession". The Tampa Tribune.
- Huriash, Lisa J. (May 6, 2008). "North Lauderdale wants to split Florida into two states". Sun-Sentinel.
- Cutway, Adrienne. "Officials want South Florida to break off into its own state". Sun-sentinel.com. Retrieved 10 July 2018.
- Cutway, Adrienne. "Officials want South Florida to break off into its own state". Orlandosentinel.com. Retrieved 10 July 2018.
- "Archived copy". Archived from the original on 2014-10-22. Retrieved 2014-10-22.
- Lamme, Ary J.; Oldakowski, Raymond K. (November 2007). "Spinning a New Geography of Vernacular Regional Identity: Florida in the Twenty-First Century". Southeastern Geographer. University of North Carolina Press. 47 (2): 320–340. doi: 10.1353/sgo.2007.0029.
- Warf, Barney; Waddell, Cynthia (January 2002). "Florida in the 2000 Presidential Election: Historical Precedents and Contemporary Landscapes". Political Geography. Elsevier. 21 (1): 85–90. doi: 10.1016/S0962-6298(01)00063-4.
- Anthony J. Catanese Center for Urban and Environmental Solutions at Florida Atlantic University (2006). "Charting the Course: Where is South Florida Heading?" (PDF). Florida Atlantic University. Archived from the original (PDF) on December 16, 2011. Retrieved March 23, 2012.
- South Florida travel guide from Wikivoyage
- Populations of Metropolitan and Micropolitan Area (and rankings)