Comcast may have it online at https://www.xfinity.com/learn/channel-lineup or https://www.xfinity.com/support/local-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 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.
A typical Digital Economy lineup includes: Limited Basic/local channels, A&E, AMC, Animal Planet, BET, Cartoon Network, C-SPAN, CNN, Comedy Central, Discovery, Disney, E!, Food Network, Fox News, Hallmark, History, Lifetime, On Demand, truTV, TV Land, USA, The Weather Channel, and Music Choice.
That's for zip code 17401 in Central PA. Other areas should be similar, plus or minus a few channels.
Hello lipreg, the information that (BruceW0 shared is correct. You can click on the link above to obtain a full channel lineup for your area, please reach back out to me here if you have any additional questions/concerns.