Non-Metro Difficult Development Areas: Effective 01-01-2025

This data layer shows U.S. Department of Housing and Urban Development (HUD) annually designated non-metropolitan Difficult Development Areas (DDAs). Non-metropolitan DDAs are areas with high construction, land, and utility costs relative to area median gross income and are based on Fair Market Rents (FMR), income limits, the 2020 census counts, and 5-year American Community Survey data. The unit of geography for non-metropolitan DDAs is the non-metropolitan county or county equivalent area. Non-metropolitan DDAs are designated annually as updated income, and FMR data are made public.本数据图层展示了美国住房和城市发展部（U.S. Department of Housing and Urban Development, HUD）每年划定的非都市圈困难发展区（Difficult Development Areas, DDAs）。 非都市圈困难发展区指相较于区域总收入中位数而言，建筑、土地及公用事业成本偏高的区域，其划定依据涵盖公平市场租金（Fair Market Rents, FMR）、收入限额、2020年人口普查统计数据以及5年期美国社区调查数据。 非都市圈困难发展区的地理统计单元为非都市圈县或等效县区域。 非都市圈困难发展区的年度划定工作，会在更新后的收入及公平市场租金数据对外公开后开展。