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State dataHousing & Development
Small Difficult Development Areas
Published by Maryland Department of Housing and Community Development · Updated 07/22/2025 · As needed
- Last updated
- 07/22/2025
- First published 07/22/2025
- Update frequency
- As needed
- Formats
- 4
- CSV, JSON, GeoJSON
- Coverage
- Maryland
- Statewide
About this dataset
Low-Income Housing Tax Credit Qualified Census Tracts must have 50 percent of households with incomes below 60 percent of the Area Median Gross Income (AMGI) or have a poverty rate of 25 percent or more. Difficult Development Areas (DDA) are designated by the U.S. Department of Housing and Urban Development and are based on Fair Market Rents, income limits, the 2010 census counts, and 2006-10 5-year American Community Survey data when they becomes available. Beginning with the 2016 DDA designations, metropolitan DDAs will use Small Area Fair Market Rents (FMRs) rather than metropolitan-area FMRs for designating metropolitan DDAs. Maps of Qualified Census Tracts and Difficult Development Areas are available at: huduser.gov/sadda/sadda_qct.html.
2023 IRS SECTION 42(d)(5)(B) METROPOLITAN DIFFICULT DEVELOPMENT AREAS (OMB Metropolitan Area Definitions, September 14, 2018 [MSA] and derived FY2022 HUD Metro SAFMR Area Definitions [HMFA])
Files and access
Links open the official government source
- CSV downloadopendata.maryland.govCSV
- JSON (SODA API)opendata.maryland.govJSON
- GeoJSONopendata.maryland.govGeoJSON
- XMLopendata.maryland.govXML
API endpoint: https://opendata.maryland.gov/resource/uv7m-ncd9.json
Links open outside websites we do not control.
Frequently asked questions
- Who publishes Small Difficult Development Areas?
- Maryland Department of Housing and Community Development, part of State of Maryland, publishes this dataset on Maryland Open Data.
- How often is it updated?
- The publisher lists the update frequency as as needed. The last update was on 07/22/2025.
- How do I download it?
- It is available as CSV, JSON, GeoJSON, XML. Use the links in Files and access, which open the official government source.
Similar data from other publishers
- Difficult Development AreasCity of CharlotteDifficult Development Areas (DDA) for the Low Income Housing Tax Credit program are designated by U.S. Department of Housing and Urban Development (HUD) and defined in statute as areas with high construction, land, and utility costs relative to its Area MedianCSVGeoJSONShapefileKML+1Updated 10/16/2026
- Difficult Development Areas 2025Department of Housing and Urban Development · Office of Policy Development and ResearchThis service provides spatial data and information on Difficult Development Areas (DDAs) used for the Low Income Housing Tax Credit program. DDAs are designated by U.S. Department of Housing and Urban Development (HUD) and defined in statute as areas with highJSONCSVXLSXTXT+5Updated 09/22/2025Yearly
- Difficult Development Areas 2026Department of Housing and Urban Development · Office of Policy Development and ResearchThis service provides spatial data and information on Difficult Development Areas (DDAs) used for the Low Income Housing Tax Credit program. DDAs are designated by U.S. Department of Housing and Urban Development (HUD) and defined in statute as areas with highJSONCSVXLSXTXT+5Updated 09/30/2025Yearly
- Development AreasCity of Sioux FallsFeature layer containing authoritative development area polygons for Sioux Falls, South Dakota.CSVGeoJSONKMLZIP+1Updated 04/17/2025
- Development Plan AreasState of Hawaii · Office of Planning and Sustainability[ Metadata ] Description: Development / Community Plan Areas Source: Digitized by Office of Planning staff from 8.5 x 11 xerox copies of the community plan maps. Apr. 2024: Hawaii Statewide GIS Program staff removed extraneous fields that had been added aCSVZIPGeoJSONKML+4Updated 10/13/2026
Where this catalog comes from
- Data.gov CatalogU.S. General Services Administration
- State and local open data portalsSocrata Discovery API
- State and city CKAN portalsCalifornia, Virginia, Boston, Houston and more
- Government ArcGIS Hub sitesCity and county GIS data
Catalog checked 10/24/2026
We list dataset descriptions only. Downloads and APIs link straight to the official government source, which holds the current version and its terms of use.
Source: Maryland Open Data and Data.gov · Last updated 10/24/2026 · Listing only; the data stays with the publisher
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