Comcast may have it online at https://www.xfinity.com/learn/channel-lineup or https://www.xfinity.com/support/local-channel-lineup/, although the format is far from ideal for printing. A lineup may also have been included with one of your recent bills -- check https://customer.xfinity.com/.
Service Centers should have printed channel lineups. Check locations and hours at http://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.
Thank you for giving the print information, I did not realize I would be able to print in a three page format, after going to the print menu.....After calling Comcast, and chatting with someone in an overseas call center - I went back to the answer you gave a few weeks ago - it worked just as you wrote.