It was founded in 1988 as the Limavady Sentinel but adopted its current name in 1991. It’s published by Morton Newspapers, part of the UK-wide Johnston Press group of regional newspaper publishers. The main editorial offices are in Derry, but there’s also an office in Limavady (the address of which is given below).
It has no website of its own; the link below is to the Londonderry Sentinel‘s website.
It comes out on Wednesdays. An e-edition (of the Londonderry Sentinel) is also available by paid subscription.