NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

County Adjacency

Census offers county adjacency files for identifying which counties are neighbors.

The fipscounty variable in these files can be linked to Census SF1 2010 880 5-Digit ZIP Code Tabulation Area-State-County sf12010880us1 SAS, Stata, or CSV files by creating a fipscounty variable from the state and county variables in the SF1 files.

ZIP Codes are created by the U.S. Post Office for mail delivery and a small percentage may cross state lines. ZIP Code Tabulation Areas (ZCTAs) are representations of ZIP Codes made by Census.

Year
Source
Stata
SAS
CSV
Description
2010
txt
dta
sas7bdat
csv
desc

To report errors, or if you have comments or suggestions, e-mail jroth@nber.org.

Last Update: May 8, 2017 Created by Jean Roth May 8, 2017

 
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