IP address

You likely recently received a new / different WAN (public) IP address assignment to your connection from their DHCP server / IP address pool, and the rDNS / geolocation data that is associated with it is now incorrect for you as it previously belonged to someone else that lived in that other area. 

Comcast shuffles blocks of IP addresses around the country all the time. And after doing local plant maintenance / upgrades. ISP's don't correct this. A third-party service does. Unfortunately, this is typically a *back-burner* thing to get corrected. The only thing that you can do is to report it. You can try this;

https://www.maxmind.com/en/geoip-location-correction 

https://support.google.com/websearch/contact/ip/ 

https://whatismyipaddress.com/location-feedback  

http://www.ipligence.com/contact/ 

https://www.ip2location.com/contact/ 

Wait for the geolocation provider to approve your request. If your request is approved, the amount of time it takes to see the correction varies by provider. The average is two weeks to a month or so.

You can also try this;

If you are using a router that has a MAC address cloning feature, you can clone a different MAC address into it. This will force a change of your Comcast assigned WAN / public IP address. No guarantees that the new address won't also have incorrect geo-data as it may be from the same block of IP's. YMMV.

Hello and welcome to Comcast @guitrdad. I am sorry to hear that your games are blacked out. How are you trying to access the games? 

They stated "IP address"...........