The capital and biggest city is Las Palmas de Gran Canaria in the north of the island . The island has a population of 820,257 with 378,628 ( year 2005 ) of those in the capital city of Las Palmas de Gran Canaria . Las Palmas de Gran Canaria is the capital of the province of Las Palmas , and also one of the two capitals of the autonomous community of the Canary Islands , along with Santa Cruz de Tenerife .