SAN FRANCISCO — Amazon packages get delivered to all sorts of places.

Front porches? Naturally. Cubicles? Of course. Inside locked homes? Yes, that, too.

Now add a new one: the trunk of your car.

Starting Tuesday, people in dozens of cities across the United States can start getting their Amazon orders delivered to a parked car, provided their vehicle has the proper technology. With a few taps on a smartphone screen, the courier can unlock the car and drop the box inside the trunk or on the back seat.

The new service is aimed at anyone who doesn’t want to risk having their package swiped from their front porch or who can’t receive an Amazon order at work, perhaps because an employer doesn’t allow it or because the company mailroom is not secure.