This was partially based on channel listings from system operator websites and partially from channel listings reported to other sites for program guide purposes.
It is current and accurate to the best of my present ability as of late July 2013.
Networks are identified solely by the flagship station. Counties where there is substantial overlap between two particular networks are indicated.
The map only accounts for MPTA members, and does not include adjacent public television networks TVO (north), TFO (north), SDPB (southwest), IPTV (south), or WPT (east). It’s also debatable if CBC (north) counts as public television these days.