VERIFIED SOLUTION i

What is the purpose of the CITYDB, CITYNM, CITYNAA, and CITYNAS files in CODE-1 Plus?


 
The four city files included in the US Postal database have the following purposes:
 
CITYDB is the city details file
CITYNM is the city name file
CITYNAA and CITYNAS are both alternate indexes for the CITYNM file
 
UPDATED:  April 12, 2017