More than 20 percent of counties across the country will be affected by the scheduled decline in the FHA loan limits announced by the Department of Housing and Urban Development recently, with the fallout varying from one area to another. Announcing the new loan limits taking effect on Oct. 1, HUD said the change is expected to affect 669 counties, or 20.7 percent of the 3,234 jurisdictions in which FHA insures home loans. Despite dire warnings from mortgage industry groups, HUD estimates that only a fraction of borrowers living in high-cost areas would be impacted by the new loan limits. Last year, only 3 percent of FHA borrowers lived ... [Includes two data charts]