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Metropolitan Small Difficult Development Areas (SDDAs)

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Metropolitan Small Difficult Development Areas (SDDAs)


Metropolitan Small Difficult Development Areas (SDDAs)

Metropolitan Difficult Development Areas (DDAs) are desginated by ZIP Code Tabulation Area (ZCTA). Although the geographic extent of ZCTAs is very similar to current 5-digit ZIP codes, ZIP Code Tabulation Areas (ZCTAs) remain fixed over time while the U.S. Postal Service (USPS) occasionally alters specific ZIP code boundaries. The data from which SAFMRs and SDDA designations are derived, however, does not immediately shift with the USPS definition of ZIP Codes, but remains defined by the ZCTAs as established by the Census Bureau. Therefore, for purposes of determining whether a property is located in a SDDA, users should refer to the SDDA (ZCTA) address locator at rather than the USPS-assigned 5-digit ZIP Code of the project.

ZCTAs marked with an asterisk (*) are located in two metro areas with only part of the ZCTA desiganted as DDA. That is, the identified ZCTA has territory outside of the named FMR area and only the part of the ZCTA inside the named FMR area is designated as a DDA. Refer to the DDA (ZCTA) address locator at to determine if a location is inside the designated ZCTA.

State Metropolitan Area DDA ZCTAs

Count = metropolitan ZCTAs.

See the latest Designation Notice for information on effective date and when changes to designations may be made.

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