Understanding and Enhancing the U.S. Department of Housing and Urban Development’s ZIP Code Crosswalk Files

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https://www.huduser.gov/portal/periodicals/cityscpe/vol20num2/article16.html

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http://hdl.handle.net/11603/11293

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UMBC Geographic Information Systems (GIS)
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UMBC Geography and Environmental Systems Department

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2018

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journal article
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Citation of Original Publication

Ron Wilson, Alexander Din, Understanding and Enhancing the U.S. Department of Housing and Urban Development’s ZIP Code Crosswalk Files, The Housing-Health Connection Volume 20, Number 2 , 2018, https://www.huduser.gov/portal/periodicals/cityscpe/vol20num2/article16.html

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This item may be protected under Title 17 of the U.S. Copyright Law. It is made available by UMBC for non-commercial research and education. For permission to publish or reproduce, please contact the author
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Subjects

ZIP Codes
Department of Housing and Urban Development (HUD) United States Postal Service ZIP Code Crosswalk Files
ZIP Code allocation process
analysis using the HUD Crosswalk File in associating a ZIP Code with U.S. counties.
adverse statistical properties inherent with ZIP Codes
distortion of results using ZIP codes
aggregating ZIP code counts

Abstract

ZIP Codes are commonly used for mapping, spatial analyses, creating tables, or other reporting products. Used for these tasks, the results from using these geographies often are distorted because of adverse statistical properties inherent with ZIP Codes. Summarizing ZIP Code data to other large geographies (for example, county, Core Based Statistical Area, state) associates them with these other geographies to create aggregate counts so that metropolitan or county rankings can be reported. This process requires ZIP Codes to be properly allocated to these other geographies to accurately associate a record with that area. Although some companies or government organizations already provide a crosswalk to these geographies, the allocation method used is unclear, leaving it indiscernible as to the accuracy of the assignment of ZIP Codes. In this article, we demonstrate how to use the U.S. Department of Housing and Urban Development (HUD) United States Postal Service ZIP Code Crosswalk Files to more directly control the ZIP Code allocation process of records to alternative geographies. In meeting this objective, we also provide results of an analysis using the HUD Crosswalk File in associating a ZIP Code with U.S. counties.