Stata program for merging U.S. county identifiers
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README.md

countyfips

countyfips is a simple Stata crosswalk program for adding various county-level identifiers (name, FIPS, Census codes) that may be missing from your dataset. The purpose of this program is to facilitate merging datasets that do not share a common identifier.

Prerequisites

Stata: countyfips is compatible with Stata version 12.1+. It may be compatible with previous versions, but it has not been tested in those environments.

Installation

Github (for Stata v13.1+): Run the following via the Stata command line.

net install countyfips, from(https://raw.github.com/cbgoodman/countyfips/master/) replace

Github (for Stata v12.1+): Download the zipped file of this repository. Unzip on your local computer. Run the following code via the Stata command line replacing with the location of the unzipped repository on your computer.

net install countyfips, from(<local source>) replace

Using countyfips

countyfips offers four methods of merging using either county names, five-digit county FIPS codes, the combination of two-digit state FIPS and three-digit county FIPS codes, or the combination of two-digit state Census codes and three-digit county Census codes.

Merging with name where county is the name of county requires either statefips or statecode to be specified

. countyfips, name(county) statefips(stfips)

or

. countyfips, name(county) statecode(stcode)

Merging with fips

. countyfips, fips(county)

Merging with statefips and countyfips

. countyfips, statefips(stfips) countyfips(cofips)

Merging with statecode and countycode

. countyfips, statecode(stcode) countycode(cocode)

By default, countyfips will generate a new variable, _merge, to indicate the merged results. If you do not want to create this variable, specify nogenerate. This will keep matched observations and unmatched master observations.

. countyfips, fips(county) nogenerate

Limitations

  • Using countyfips with the name option requires specific formatting of the name variable. County names must not include "county" after the name. County names beginning with "Saint" such as Saint Louis must be abbreviated to "St."
  • FIPS codes are available for U.S counties, county equivalents, and territories. Census codes are only available for counties or county equivalents (such as independent cities).
  • FIPS codes for Virginia independent cities as well as merged county and independent cities (as is the practice for some areas in BEA data) are included. Using countyfips with the name option will require extremely particular formatting. Additionally, only the statefips option will work when merging with name.
  • countyfips uses the more recent FIPS code for Miami-Dade county (12086) rather than the FIPS code for Dade county (12025). The Census state (10) and county (13) codes remain unchanged.

Bugs

Please report any bugs here.