Once again, Carnival CEO and Miami Heat owner Micky Arison heads the list of the richest Florida residents on the Forbes 400 list of the wealthiest Americans.

With a net worth of $5 billion, Arison clocked in at No. 68 — an increase from his 2011 status of No. 75 with $4.2 billion — despite the financial troubles cruise giant Carnival Corp. has faced since the Costa Concordia accident killed 32 people in January. Carnival owns Costa Cruises.

This year’s 400 list includes 32 Florida residents. Returning from last year’s South Florida list are Subway founder Fred DeLuca, of Fort Lauderdale; medical entrepreneur Phillip Frost, of Miami Beach; entrepreneur H. Wayne Huizenga, of Fort Lauderdale; insurance mogul Peter Lewis, of Coconut Grove; Lighthouse Pointe real estate investor Igor Olenicoff; Miami auto dealer Norman Braman; TV station owner Edmund Ansin; Fisher Island outsourcing businessman Bharat Desai; and frozen foods seller Robert Rich Jr., of Islamorada.

Back after a recession-era hiatus: Miami developer Jorge Perez.

New on the South Florida list: hedge-fund investor Edward Lampert, No. 125, who bought a home on Miami Beach’s Indian Creek last spring for $40 million.

The Forbes 400 list for 2012 rings up a total net worth of $1.7 trillion, up from $1.5 trillion last year. The average net worth of a Forbes 400 member is $4.2 billion, the highest ever, as two-thirds of those on the list saw their fortunes grow.

Leading the list nationally as the three richest entrepreneurs are Microsoft’s Bill Gates, Berkshire Hathaway’s Warren Buffett, and Oracle’s Larry Ellison, who maintained their spots at 1, 2, and 3.

Here are the Florida representatives on the list. (Note that several are tied for position):

68. Micky Arison, $5 billion, Bal Harbour, Carnival Cruises

85. Dirk Ziff, $4.3 billion, North Palm Beach, investments

92. William Koch, $4 billion, Palm Beach, oil and investments

108. Malcolm Glazer & family, $3.6 billion, Palm Beach, sports teams and real estate

125. Edward Lampert, $3.2 billion, Miami Beach, hedge funds

132. Terrence Pegula, $3 billion, Boca Raton, natural gas

151. Edward DeBartolo Jr., $2.7 billion, Tampa, shopping centers

179. Fred DeLuca, $2.5 billion, Fort Lauderdale, Subway restaurants

179. Shahid Khan, $2.5 billion, Naples, auto parts

190. Phillip Frost, $2.4 billion, Miami Beach, pharmaceuticals

190. H. Wayne Huizenga, $2.4 billion, Fort Lauderdale, investments

190. Igor Olenicoff, $2.4 billion, Lighthouse Point, real estate

190. Robert Rich Jr., $2.4 billion, Islamorada, frozen foods

206. Isaac Perlmutter, $2.3 billion, Palm Beach, Marvel Entertainment

206. Wilbur Ross Jr., $2.3 billion, Palm Beach, investments

218. Jeff Greene, $2.2 billion, Palm Beach, real estate and investments

218. George Lindemann & family, $2.2 billion, Palm Beach, investments

218. William Wrigley Jr., $2.2 billion, North Palm Beach, chewing gum

229. Albert Ueltschi, $2.1 billion, Vero Beach, FlightSafety

239. Bharat Desai & family, $2 billion, Fisher Island, outsourcing

271. S. Daniel Abraham, $1.8 billion, Palm Beach, Slim-Fast

298. Norman Braman, $1.6 billion, Miami, art and car dealerships

298. Tom Golisano, $1.6 billion, Naples, payroll services

311. John Henry, $1.5 billion, Boca Raton, sports

311. Richard Schulze, $1.5 billion, Bonita Springs, Best Buy

328. Alfred James Clark, $1.4 billion, Vero Beach, construction

360. Edmund Ansin, $1.2 billion, Miami Beach, television

360. James Clark, $1.2 billion, Palm Beach, Netscape

360. Christopher Cline, $1.2 billion, North Palm Beach, coal

360. Jorge Perez, $1.2 billion, Miami, condos

360. Charlotte Colket Weber, $1.2 billion, Hobe Sound, Cambell Soup

392. Peter Lewis, $1.1 billion, Coconut Grove, insurance