While the option to sort contact by tags is not offered at this time, the Advanced Search option will allow contacts with tags to be filtered in/out of the search results.
To filter contacts with/without tags, follow these steps:
2. Click Advanced Search
3. Click Tags
To search a specific tag, change drop-down from Any to All
To search for a variety of tags, select Any from the drop-down
4. Click on the field to either include or not include, and select the desired tag from the list
5. Click Search
The filtered search results can also be exported by selecting all contacts in the filtered search results and then clicking on 'More', then Export, then Export Selected. Once exported, the spreadsheet can be sorted by the tags column.