More than 150,000 people visited the anti-theme park theme park in a derelict seafront lido.
The temporary art show in Weston-super-Mare sold 4,000 tickets a day online, plus 500 more to people willing to queue for hours, often in the rain.
Dismaland described itself as offering "entry-level anarchism", and satirizes the tourism and theme park industries.
Visit Somerset says the town's tourism businesses have benefited by as much as £20 million, more than three times its original forecast. The biggest boost was for hotels and B&Bs, many of which would normally be half-full in September.
The local hoteliers association estimates an additional 50,000 nights were sold.
Go Holiday news : www.govillasandcottages.co.uk
All your holiday needs: IN PRINT - ON-LINE - DiGiMAG - SMARTPHONE -TABLET - BLOG - TWITTER - G+ - FACEBOOK