Some states have experienced more recent surges. From December 2006 to December 2007, more than 40 states saw recipient numbers rise, and in several  Arizona, Florida, Maryland, Nevada, North Dakota and Rhode Island  the one-year growth was 10 percent or more.

In Rhode Island, the number of recipients climbed by 18 percent over the last two years, to more than 84,000 as of February, or about 8.4 percent of the population. This is the highest total in the last dozen years or more, said Bob McDonough, the state’s administrator of family and adult services, and reflects both a strong enlistment effort and an upward creep in unemployment.

In New York, a program to promote enrollment increased food stamp rolls earlier in the decade, but the current climb in applications appears in part to reflect economic hardship, said Michael Hayes, spokesman for the Office of Temporary and Disability Assistance. The additional 67,000 clients added from July 2007 to January of this year brought total recipients to 1.86 million, about one in 10 New Yorkers.

Nutrition and poverty experts praise food stamps as a vital safety net that helped eliminate the severe malnutrition seen in the country as recently as the 1960s. But they also express concern about what they called the gradual erosion of their value.

Food stamps are an entitlement program, with eligibility guidelines set by Congress and the federal government paying for benefits while states pay most administrative costs.

Eligibility is determined by a complex formula, but basically recipients must have few assets and incomes below 130 percent of the poverty line, or less than $27,560 for a family of four.

As a share of the national population, food stamp use was highest in 1994, after several years of poor economic growth, with an average of 27.5 million recipients per month from a lower total of residents. The numbers plummeted in the late 1990s as the economy grew and legal immigrants and certain others were excluded.