If you’ve got an iPhone or an Android phone or pretty much any other modern smartphone, there’s an area for “Favorite” contacts.
One number you should definitely include there is your local police department’s. I always keep the main number for the police department in the town where I live, as well as that of the town where I work.
This way should you arrive home and find your door ajar, when you know nobody’s home, you can call the police immediately without entering your home yourself. Or if you see something suspicious in your neighborhood while you’re walking your dog, the police are just one click away.