For most of the 20th century the resident population decreased, while at the same time many vacation homes were built.

In Ingarö cemetery lie the remains of the first Swedish aviator, Carl Cederström, also known as Kalle Flygare.

Ingarö has been the location for movie-making, including parts of the 1993 film Sune's Summer and parts of The Girl with the Dragon Tattoo featuring Daniel Craig.

On 14 June 2008, Esbjorn Svensson, the pianist of the jazz band E.S.T, died at Ingarö after going missing during a scuba diving session.

Björkvik is a jetty and bathing place by Nämdöfjärden on southern Ingarö in Värmdö municipality.