One such story is Jericho, a US TV series that depicts life in the small town of Jericho, Kansas after a nuclear attack wipes out the nation's major cities.
Another one, based in Britain, and somewhat more gritty and less "Hollywood" is Survivors. After a world wide epidemic of a deadly virus wipes out all but 5% of the population, those left behind struggle to survive in a world where all the rules have changed.