Qualified Census Tract Table Generator

This page allows you to generate Low-Income Housing Tax Credit (LIHTC) Qualified Census Tract (QCT) tables for individual counties, individual metropolitan areas, nonmetropolitan parts of individual States, all counties in a single State, the complete table for all metropolitan areas, and the complete table for all nonmetropolitan parts of States. Simply click the appropriate button below.

Geocoded lists of all Qualified Census Tracts are available in WinZip-archived dBase files. | 2017 | 2018 |


Notes on 2018 QCTs:

Effective date: The effective date of the 2018 QCTs and DDAs is January 1, 2018.

The 2018 QCTs are based on MSA definitions published in OMB Bulletin No. 13-01 on February 28, 2013 and data from the 2010 Decennial Census and three sets of 5-year tabulations of the American Community Survey (2009 to 2013; 2010 to 2014; and 2011 to 2015). The Census Tract boundaries are according to the 2010 Decennial Census. See the latest Designation Notice for complete information.

Excel spreadsheets containing the data used to designate the 2018 QCTs are available here. The designation algorithm can be read here.

Select Year:

The Complete Metro Table is available as an Adobe Acrobat (*.PDF) file formatted for optimal printing. | 2017 | 2018 |

Select Year:

The Complete Nonmetro Table is available as an Adobe Acrobat (*.PDF) file formatted for optimal printing. | 2017 | 2018 |

Difficult Development Area Tables

Effective date: The effective date of the 2018 QCTs and DDAs is January 1, 2018

ZIP Code-based Metropolitan DDAs (Small DDAs):


Nonmetropolitan Difficult Development Areas

County-based DDAs:



Information on Small Difficult Development Areas (SDDAs):

While the geographic extent of ZCTAs is very similar to current 5-digit ZIP codes, and the vast majority of ZIP Code areas remain fixed over time, the U.S. Postal Service (USPS) may alter specific ZIP code geography at any time after HUD designates SDDAs. 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 2017 and 2018 SDDA status, users should refer to the DDA (ZCTA) address locator at http://www.huduser.gov/portal/sadda/sadda_qct.html rather than the USPS-assigned 5-digit ZIP Code of the project.


The Difficult Development Area tables are available as Adobe Acrobat (*.PDF) files formatted for optimal printing.
| Metro DDAs 2017 | Nonmetro DDAs 2017 | | Metro DDAs 2018 | Nonmetro DDAs 2018


To view the location of the 2017 and 2018 QCTs and SDDAs, visit the HUD User GIS Service -- Low-Income Housing Tax Credit Qualified Census Tract (QCT) and Small Difficult Development Area (SDDA) Locator.

| HUD Home Page | HUD User Home | Data Sets | Qualified Census Tracts and Difficult Development Areas |

Problems or questions? Contact Michael.K.Hollar@hud.gov.