Comcast may have it online at https://www.xfinity.com/support/local-channel-lineup/ or https://www.xfinity.com/learn/channel-lineup, or they may have included it with one of your recent bills. Check https://customer.xfinity.com/.
Service Centers and Xfinity Stores should have printed channel lineups. Check locations and hours at https://www.xfinity.com/support/service-center-locations/ to pick one up, or call Customer Service at 1-800-Comcast and have them send a lineup to you.
Please send a list of my channels.
Did you read the last post before yours? Follow the directions found there. I received the latest list with my January statement for my service area.