Host should be derived from API key

[dawesi]

by using listLast(apikey,'-') you can obtain the dc for the mailchimp account

the hard coded references to us1 can then be removed permanently.
eg:
https://us1.api.mailchimp.com/3.0/

should be:
https://#dc#.api.mailchimp.com/3.0/ - put appropriate variable here

[GunnarLieb]

Please see line 25 in Mailchimp.cfc. It's already there

[GunnarLieb]

Will add comment to cfc