WASHINGTON — The U.S. agencies that supervise more than 8,000 banks haven't censured any of them for violating fair-lending laws, three years after Federal Reserve researchers began assembling data showing blacks and Hispanics are more likely than whites to be saddled with high-priced home loans.

Minorities stand to be hardest hit by rising delinquencies and foreclosures in subprime loans. While Census Bureau data show that homeownership rates rose to records among blacks in 2004 and among Hispanics in 2005, they still trail whites by 25 percentage points, and the gap may widen in the current bust.

"Black people and Hispanics have been targeted," said Alphonso Jackson, secretary of Housing and Urban Development, whose department is expanding its own probe of discriminatory lending.

"Low- and moderate-income people get one shot at home ownership," Jackson said in an interview. "And if they don't make it work, they don't get a second shot."

Subprime loans — those made at higher interest rates to people whom banks consider risky or who have sketchy credit histories — accounted for more than half of the home foreclosures in the fourth quarter of last year. The Fed's review, conducted by economists from its research and statistics division, covered lending data from 2004 and 2005, the first two years of expanded disclosure requirements for banks.

Fed researchers singled out 470 lenders for closer scrutiny over two years, with some lenders showing up in both 2004 and 2005. The Fed has turned the names over to regulators and other authorities, including in some cases state officials.

The central bank says its research isn't conclusive on whether discrimination occurred. Details on how lenders price loans, such as borrowers' credit histories and the ratio of the loan amount to the value of the home, weren't provided by banks.

Even so, concentrations of high-cost mortgages "shouldn't break down so blatantly and crudely to race," said Sarah Ludwig, co-director of the Neighborhood Economic Development Advocacy Project in New York and a member of the Fed's Consumer Advisory Council. "Neighborhoods are getting mauled, and the regulators have been asleep at the wheel."

The supervision of America's 8,650 banks is split among five agencies: the Fed, the Office of Comptroller of the Currency, the Office of Thrift Supervision, the Federal Deposit Insurance Corp. and the National Credit Union Administration. Each has the power to uphold fair-lending laws and to punish offenders.

None of the five national regulators has published an enforcement action based on the data, according to agency representatives. Some lenders have been referred to the Justice Department for possible action, and investigations are continuing.

Interagency cooperation has benefited minorities in the past. A 2002 Fed referral to the Justice Department on lending practices by First American Bank of Carpentersville, Ill., resulted in a $5.7 million consent order in 2004 for new branches, investment and education in black and Hispanic neighborhoods.

Consumer groups say minority neighborhoods may be intentionally marketed for high-cost loans by nonbank lenders, while poor financial literacy among low-income borrowers may lead to wrong choices. FDIC Chairwoman Sheila Bair said she is troubled by the data. "I don't believe, and I don't know that I have ever heard my colleagues say, that these disparities — and they are significant — can all be explained away through risk-based pricing," Bair said.

Consumer advocates using the Fed figures in their own research say they do find evidence of discrimination. The Center for Responsible Lending in Durham, N.C., last year took the same mortgages analyzed by the Fed and matched them with its own information. The new data subset, of 177,487 subprime loans made in 2004, included credit scores, loan-to-value ratios and property locations. The model concluded that African-American and Latino borrowers were more likely to receive higher-rate loans than white borrowers with similar risk.