About Central Office Searches

Marigold's Central Office Lookup Tool provides detailed information about Central Office locations, facility services, and direct marketing leads served by that facility.

There are several ways to search for particular Central Offices. The main page provides a list of states which each lead to corresponding zip codes. These in turn present a list of Central Office/CLLI codes.

The Central Office Lookup Tool also provides several search mechanisms:

Search by CLLI Code

If you already know what Central Office or CLLI you would like more detailed information about, enter the code in the appropriate search box and click Search. You can enter either the 8-digit or 11-digit CLLI code.

Search by NPA-NXX

You can search by area code (NPA) or NPA-NXX by entering it in the corresponding search box and clicking Search. An area code search will present a list of available NPA-NXX's.

Search by Zip Code

You can view a list of all Central Offices within a zip code by entering a 5-digit postal code into the corresponding search box and clicking Search. You will be presented with a corresponding list of Central Offices.

CLLI is a trademark of Telcordia.

Go to the Central Office Lookup Tool