How can I use NAICS and SIC Codes in Infogroup Historical Business Data on WRDS?
Answer
Infogroup business location data delivered on the WRDS uses 8‑digit NAICS codes and 6‑digit SIC codes, which differ from the standard versions commonly used elsewhere.
To search for a 6‑digit NAICS code - like 445110 (Supermarkets and Other Grocery Retailers (except Convenience Retailers) - you'll need to expand it to include all corresponding 8‑digit Infogroup codes.
For instance, instead of entering 445110, you would enter: 44511001 44511002 44511003 44511004 44511005 44511006 44511007 44511008
Paste these into the NAICS text box in WRDS to retrieve all business locations associated with that classification.
The same approach applies when searching by SIC codes—enter all corresponding extended codes to ensure complete results.