How do you handle a neighbor who excessively calls police?

If the police department feels it is excessive, they can probably deal with the problem on their own.

If you are having a dispute with a particular neighbor, you may want to contact your city or county to find out if there is an approppriate mediation service that can help resolve the dispute.

Where I live the city pays a mediation firm to assist with neighbor disputes. This type of service can resolve a lot of problems between otherwise reasonable people.