As we discussed today, Union residents will be accurately counted based on Census geography codes, not U.S. Postal Service (USPS) addresses. So they can complete the 2020 Census Questionnaire as instructed.


The U.S. Census Bureau relies on an accurate postal address and the USPS to deliver census correspondence to most households


The Census Bureau recognizes that the Post Office associated with a particular ZIP Code in the mailing address for a residence may differ from the legal municipality in which the housing unit is actually located. In addition, the “city” name(s) used by the USPS to identify a specific ZIP Code may not be the name that residents serviced by the Post Office consider themselves to reside in.


As such, Census geography codes differ from the USPS. The Census Bureau Master Address File contains a geographic code (location) for every known living quarter that corresponds to the location of the physical address structure. This geographic location is either a latitude/longitude coordinate or a Census Tract and Block. Most importantly to your question today - data that results from the 2020 Census are tabulated using the Census geography code assignments for each household, not postal address. Housing units located with the legal boundary of Union, CT will be tabulated to Union, CT - even though their mailing address may indicate a different town.


Lastly, below is a comprehensive link to the differences between a USPS city and Census Geography.


Thank you for reaching out and sharing this information.


Most Respectfully,



Catherine Marx

Partnership Specialist

New York RCC Field Division

U.S. Census Bureau

Office 603-738-7288

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USPS City Versus Census Geography

The U.S. Census Bureau relies on an accurate postal address and the U.S. Postal Service (USPS) to deliver census correspondence to most households. A postal address typically is composed of house number, street, city, state, and ZIP Code TM. The mailing address for a residence is not used to assign ...