Contact List count does not match from API to web GUI

[NCJTC]

Is there any reason that my contact count for a list when logging in to Constant Contact would not match the count when using the API?

In this example, I have a list called "Not Identified." When I use the API, it returns 61,207 contacts. When I login to Constant Contact, I see 63,438.

What accounts for the discrepancy?

[David_B.]

Hello,

Thank you for reaching out to the API Support team here at Constant Contact.

There are a few possible causes for a discrepancy in contact counts on lists. I'd like to get a little bit more information about this to help you narrow it down. For privacy, please send an email to webservices@constantcontact.com with your username and the details of the call you are making to our API when you see this. We'd be happy to dig into this for you.

Sincerely,
David B.
Tier II API Support Engineer