Thank you for reaching out to us through the Community. To merge your contact lists:
Click Contacts at the top of the menu bar in your Constant Contact account
Click "Email Lists".
Select any lists you want to merge together by clicking the check box.
Type the new list name in the box provided
To view the process of the merge, click on Activity to the top left of the Contacts management page. For more information on this, please click here. I hope this helps. Let us know if you have any further questions.
Lucas_D Community & Social Media Support
If you find my post helpful, and it answers your question, please mark it as an "Accepted Solution" by clicking the Accept as Solution button in the bottom right hand corner of this post.
Increase your profitability by integrating your email marketing and social media. Download this guide and learn how you can achieve great results with email marketing