Where can I find a list of the country codes given on the Detailed Activity page?

I found a list of country codes (ISO 3166, found here), but some of the two-letter codes Squarespace uses aren't on the list. Is there a way to access the list Squarespace is using?

Here's a snap of part of my Detailed Activity page:

Specifically, I cannot find a country that uses the two-letter code FL or AP.

Thanks for your help.