if I have a car's license plate number how can I find out who owns it?

If they stay often enough to be considered living there- then you should be told who they are so that you can run a background check. Most leases have a definition of resident so they can require that. I own a place just next to a Junior High School. What kind of person would I be to allow a convicted drug dealer to live there?

not without police authority you won't be able to get it

if you think this person is suspicious you can report the plate number to the police and they will check to find out if suspicions are valid but you just don't like that this appears to be more than a frequent visitor which if you don't have something in your lease is none of your business

If you have a sign posted that you will remove cars that don't belong there then you can list the wrecker company's name and number and then go ahead and call them to remove the car.

If a person is a "steady overnight visitor" then check to see just how long they are in that apartment each day and how many days. Then phone the renter and tell them if the person is sleeping overnight and they are not on the lease then they are trespassing for being there and that's against the law and that that person must stop staying over. If you find that after that conversation they continue to do that then evict your tenant for not following the rules of the lease. Your lease should have covered what to do about visitors.

You don't, unless there is a crime being committed in which case you contact the police and they will be able to find out in the process of the investigation, but private information like name/address from a plate is not publicly available

Why would you need to find out who owns it? If you suspect a breach of your rental agreement, you serve notice to the tenant. If you suspect something illegal is going on, you call the police.

License plate information is generally private. You could attempt a PI, but no promises. http://www.ehow.com/how_5767482_run-license-plate....

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If this is a violation of the lease, then your remedy is against the tenant. It doesn't matter who the mysterious visitor is unless and until you ask the visitor to be signed up as an occupant, at which point you can ask for ID.

As I read the information at the DMV's web site and the accompanying forms, you can get the name, but not the address, of a registered owner of a vehicle IF you verify that you are making that request for a proper purpose (e.g, matters involving fraud, theft, or insurance). It is a state and federal offense to obtain this information for other purposes, and mere curiosity would not be a proper reason for getting it.

https://www.dmv.ca.gov/portal/dmv/?1dmy&urile=wcm:...

Why are you making an attempt to find out the owner of the vehicle? Your tenant is the one that is breaking his/her lease. This is the person you would want to make dialog with.

If you have a clause in you lease indicating guest may stay for a certain number of day or the person is not on the lease, you would want to give your tenant a notice that the guest is illegal and is not on the lease,

therefore this guest is not allowed to stay overnight, or if you continue to allow the guest to stay over, you will evict your tenant.

This would or should solve your problem with the illegal guest.

I hope this has f some benefit to you, good luck.

"FIGHT ON"

You can't. Simple as that. This information isn't available to private citizens.