Thurgood's

Thurgoods is a boys' prep school located near Taunton, England.

London

London is the scene of most of the action of the novel. It is where George Smiley lives and where British Intelligence is located.

The Circus

The Circus is the name used to refer to British Intelligence because of its location in Cambridge Circus.

Bywater Street

The address of Smiley's London house is 117 Bywater Street.

Brixton

Scalp-hunters, whose official name is Travel, is a part of British intelligence. They handle surveillance work that is too messy for other agents. They are headquartered in a Brixton school house.

Hong Kong

Hong Kong is the Asian city where a Soviet trade delegation visited and one of the members of the delegation, Boris, attracted the attention of the British resident agent.

Dzerhinsky Square

Dzerhinsky Square is in Moscow. It is the location of the KGB headquarters.

Whitehall

Whitehall is...