She has contributed sketches and one-liners to BBC Radio One's 2004/05 comedy show, The Milk Run. One edition of the show was entirely given over to a script she co-wrote with her friend Dan Harkin, entitled The Adventures Of Marco Polo.
In 2005 she began publishing a fanzine, Drawing Moustaches In Magazines Monthly Magazine (Bi-Monthly), which is distributed for free, and has featured contributions from Robin Ince, Kevin Eldon and Stewart Lee, as well as Danielle Ward and Isy Suttie.
Along with fellow comics Hils Barker, Steve Hall and James Sherwood, she founded the All-Singing, All-Dancing Competitive News Bonanza, a live topical panel show that ran at the Red Lion pub in Soho, London in 2004/05, and at The Arts Theatre Club in Soho in 2006. In 2006 she also launched her own monthly comedy clubs, The Sunday Night Adventure Club, at the ABC Café in Crystal Palace, London and The OK Club at the Boogaloo pub in Highgate, North London.
Long has written for the Channel Four teen comedy-drama series Skins. She has also appeared in an online webisode and episodes five and ten of the second series of the show, in which she plays a college careers advisor.
She has also been involved in BBC Switch, on a weekly mini-feature called "Josie Long's Confuse the Teacher Feature", where a word is read out by Long for young people listening to the show to include in their homework, which was formed after her suggestion of the idea during an interview on the show with Annie Mac.
Her act often involves drawing a sea scene on her arms and stomach.
Long has a love of applique and the V&A, and live Boggle contests sometimes form a part of her performances. On 9 october 2008 she appeared on Never Mind the Buzzcocks for the 2nd episode of the 22nd series