ABSTRACT:At various points in its history, the Federal Housing Administration (FHA) has had particularly large impacts on mortgage and housing markets in the United States. During the early to middle 2000s, FHA lending dwindled to historically low shares of the mortgage market as subprime lending boomed, with some questioning the need for the agency’s continued existence. After the subprime crisis in 2007 and pullbacks by conventional lenders, however, the FHA played one of its historic roles—the mortgage lender of last resort—and its lending surged, reaching approximately 40% of home purchase lending by the end of 2008, a level not seen since World War II. This article examines the differences in FHA activity across and, especially, within U.S. metropolitan areas in late 2008, a peak period of the crisis. The focus is on loans with moderate loan-to-value ratios, among which FHA status varies the most. Factors that affect the likelihood of such loans being FHA-insured include credit score, regional housing price trends, neighborhood demographics (including racial composition), and a variety of other factors. Controlling for many other loan-level and zip code characteristics, the odds of a loan being FHA-insured increase substantially when going from a predominantly white to an otherwise similar predominantly black zip code.