Why do some counties appear to be completely missing in CPS data sets?


#1

For example, for the variable “COUNTY,” Cook, IL (Chicago) and Harris, TX (Houston) seem to have zero records in the CPS over the last decade (I am specifically looking at ~2004-2015) despite being 2 of the most populous US counties. When looking at the county codes page (https://cps.ipums.org/cps/codes/count…) they are missing from the list. What is going on here?


#2

Identification of CPS households by COUNTY is limited by confidentiality restrictions on public use data and relativley small counties across the US. As a result, not all counties have the necessary number of households required to preserve confidentiality. Therefore, only about 45% of all households are located in an identifiable county