Many of the stories in The King In Yellow take place in Paris, the capital of France. Connections are also made to the region of Brittany.
In addition, the city of Carcassonne, from which Carcosa may be derived, is located in the south of the country. The communes after which the (non-Mythos/semi-Mythos) dolls Clairan and Crespian are named are located to the north-east of Carcassonne and south-west of Lyons.