This is a list of the longest-running United States television series, ordered by number of years the show has been aired. This list includes only first-run series originating in North America and available throughout the United States via national broadcast networks, U.S. cable networks, or syndication. Series continuations (with name changes and/or changes in network) are noted. Series broadcast within the U.S. but produced in other countries, such as Coronation Street (60 years) and Doctor Who (57 years) are not included (see: List of longest-running UK television series).