PORT ST. LUCIE, Fla. - The vast flow of people into Florida from elsewhere in the United States was the defining feature of the Sunshine State's 20th-century history, draining swamps and spurring development, swelling the economy and shaping politics.

Now the migration has stalled, according to new census figures. With hurricane fears and the soaring costs of housing and storm insurance, many here have begun to fret that Florida, long a mecca for tourists and snowbirds, has lost its allure.

"The word has gotten out about Florida. It is not the paradise that many people once thought it was," the lead editorial in the Miami Herald warned the other day.

Whether the decline in people moving from other, usually chillier, U.S. locales is temporary or a sign of long-term decline is a matter of debate. But its outlines and economic effects are increasingly clear.

According to the Census Bureau, the number of people moving from other states to Florida declined from 268,000 in 2005 to 35,000 last year, by far the most precipitous drop since such records started being kept in 1990.

Those numbers followed the news that enrollment in the state's public schools had declined for the third consecutive year.

And recently released figures from the moving company United Van Lines suggest that in stark contrast to years past, as many people are moving out of Florida as are moving in. Four years ago, for example, the company's statistics showed about 60 percent of its Florida shipments were inbound and 40 percent outbound; in the last two years, the number of inbound and outbound shipments has been almost evenly split.

"People come in here and tell me all the time, 'We're moving to Tennessee' or 'We're moving to Georgia,' " said John York, 59, a barbershop owner. "It's just too crowded and it costs too much to live" in the area.

Signs that the flow of people has slowed markedly are apparent throughout Port St. Lucie, on the Atlantic Coast a few hours' drive north of Miami.

A few years ago, Port St. Lucie ranked as one of the nation's fastest-growing cities. Now, new-home developments are marked by empty houses. Builders are pulling out, prices are dropping, and unemployment is rising. The unemployment rate in St. Lucie County has risen to 6.3 percent, the second-highest among Florida's counties, from 4.4 percent last year.

Patty Duncan, 44, one of the stylists in York's shop, worked as a real estate agent during Florida's frothy boom. Then the market went bust. "It turns out I like this better," she said. "You'll always need haircuts."

Home prices have fallen 20 percent in the last year, according to city officials.

Yet there are some who see the benefit of a slowdown.

Port St. Lucie Mayor Patricia Christensen said the recent decline has allowed the city to "catch its breath" after explosive growth created demand for new schools and roads.

Likewise, environmentalists and others who believe Florida has grown too fast or with too little planning view the drop in new arrivals as positive.

Faced with urgent appeals from longtime residents and newcomers alike, Gov. Charlie Crist and members of the Florida Legislature last year sought measures that would rein in property taxes and hurricane-insurance premiums.

But a legislative remedy for hurricane insurance has thus far yielded only meager savings for homeowners. And a new tax package under consideration would save a typical homeowner only $240 annually, according to estimates.