Exporting your contacts from MailChimp via CSV and importing them to Nimble is very simple. Just take the steps below:
Export Contacts from MailChimp
In your MailChimp account, click Audience.
(Optional) If you have more than one audience, click the Current audience drop-down and select the one you want to export.
2. Click View Contacts.
3. Click Export Audience.
4. From the Audience exports section, click Export As CSV and save the file.
Import to Nimble
Click your avatar in the top right hand corner
Choose Networks & Imports
From here, use the Import Wizard to upload your file.
For more information about this feature, please take a look at the following: