Apparently, Lake County is one such area (Leesburg, Eustis I think). Per the Comcast locator, offices are in Leesburg, Dunnellon, Orlando (apparently someone is served by Comcast instead of BH
), and Summerfield.
Taken from sunbiz.org (under Cable Franchises):
Edited by qbot101 - 4/22/13 at 8:43pm
portion of Hillsborough County (unincorporated); portion of Okeechobee County (unincorporated); portion of Osceola County (unincorporated); portions of Brevard County (unincorporated);
... portions of City of Wildwood (including the area annexed by the City from Sumter County that Comcast is authorized to serve pursuant to its franchise with Sumter County);...