Which police department is stationed at 43?

Huntington Beach Police Department is the correct choice because it is known to have a police station located at the address associated with 43. Each police department serves its own city or jurisdiction, and in this case, the Huntington Beach Police's specific location is linked to that designation.

Other departments, like Newport Beach, Irvine, and Cypress, have their own distinct geographic locations, which are not associated with the number designated in the question. Understanding police department jurisdictions and their station locations can be critical for effective law enforcement operations and community interactions.