Which police code might indicate someone is reporting their location?

The police code that indicates someone is reporting their location is the one associated with the number 20. Specifically, "10 - 20" is used to ask for or provide location information, making it crucial for law enforcement to communicate effectively regarding whereabouts. When an officer or dispatcher hears "10 - 20," they understand that a location is being shared, which is essential during operations or responding to emergencies.

The other choices serve different purposes: "10 - 4" signifies acknowledgment of a message, "10 - 9" is often used to repeat a message that was misunderstood or not received, and "10 - 18" refers to urgency, instructing officers to respond quickly without delay. Each code has its own specific use, but in the context of reporting a location, "10 - 20" is the accurate choice.