I mentioned this in response to a similar question a week or two ago, but: Do these neighbors own the house they live in? If not, can you contact their landlord to complain? You could possibly do it anonymously via a letter.

Many landlords hide where they really live quite well (my former landlord had her other rental property as the contact info for my building and vice versa), but you can try to find a landlord's mailing address through the King County parcel viewer: http://www.kingcounty.gov/operations/gis/propresearch/parcelviewer.aspx

Look up your neighbors' house, and then look at the property record.

I asked a lady who I worked with who lived next door to a drug house what she did. And she basically told me that even after getting police to help and even do surveillance and everything, they never arrested the people and they kept dealing. She ended up getting away but only because her house burnt to the ground by no fault of her own.

My suggestions which may not be all that helpful are:

1. Build a fence around your property line, and make sure there is a high gate on the walkway to your door. Put a no trespassing sign on it or warning: dogs sign. At night, lock the gate. Make it as hard as possible to get to your front door so maybe it will but down on the people knocking at your door?

2. Anonymously put out fliers announcing that the guy is dealing drugs and that everyone knows what's he's doing. Put them everywhere and maybe the guy will be afraid to keep going if he thinks that everyone knows?

I don't know if theses are any helpful or realistic. I'm so sorry for what you're going through. I wish I could offer better help.

I know this is an awful question to ask, but how invested (emotionally, etc.) are you in staying in THIS house? I know moving is a serious undertaking, especially if you have purchased the house and since we are still in a crummy economy. If you really want to have this particular neighbor problem disappear, you might have to bring moving to the table of options, even if it seems like a non-option.

It isn't fair. You shouldn't have to move. It is a horrible situation.

I would of course pursue ozchick's options first, but as far as I am aware, it is very difficult to get out people if they own their place if they are paying the bills and the police aren't particularly interested in getting them out.

You could also try to think of a way to make it VERY difficult for them to continue business there, but that may escalate things with some freaky people you don't want to mess with.

However, I don't want to leave you with a sense of disempowerment. The truth is, you have the law on your side which could work to scare them away.

Gah, this answer is crap I know, but these situations are very difficult. Scores of people have been in your position before I'm sure. Makes me wonder if there are any support groups online for this sort of thing!

I agree that I wouldn't confront these people, but how about calling child protective services? You could probably do that anonymously, and seriously, people do take that shit a LITTLE more seriously. Besides that, you would probably be doing those kids a favor!

Now that I think about it, that would be my number one phone call. Get the ball rolling in that direction and things might fall apart or become so irritating for them that they decide to pick up and leave.

You don't know your neighbors, you have no idea why people are stopping by. It's not their responsibility to inform you when they come or go.
Instead of knocking on a door to introduce yourself to your next door neighbor, you call the cops.
You said it's not meth, unless they have three pits on chains in the front yard and boarded up windows, I don't know what you're worried about.
I'm willing to bet a young family with little kids would appreciate a friendly neighbor.
Maybe if you know them and they know you, they will be less likely to let their friends disturb you.

I had a neighbor call the cops to say I was a dealer once because cars came and went all night long. I worked nights. I was coming home for lunch.

Do they own or rent? If they own it will be a bitch to do anything. If they rent you need to go after the landlord.

I would suggest going to the Federal level and contacting the DEA office for your jurisdiction. Ask for advice there. At that level you will not be dealing with an office that is compromised by local politics, resources, payoff or corruption and they will know the lay of the land as far as enforcement goes. I suspect you will be referred more locally, but perhaps to the level of the state police agency.

http://www.justice.gov/dea/contactinfo.htm

Please please don't call CPS or DEA or 911 if you haven't actually talked to these people and heard their side of the story.

For all you know they could be cancer patients trying to ease their last few years on earth.

If your sure none of it is on the up and up and you can't bring yourself to have face to face conversations with these fellow humans, you can always send THEM an anonymous letter - in addition to ozchicks great idea to write the paper, you could type one up and mail it anonymously to them - with nothing in it about neighborliness! - that makes clear what they risk losing by continuing to break the law. Tell them half their neighbors are all talking and hating on them and as a group they hired a PI to gather damning evidence, which is nearly ironclad and complete. Tell them the jail terms in years and decades and how their children will be taken by CPS and then essentially sold to foster home. Make it clear which activities are especially drawing ire from the community (customers coming through at all hours). Finally tell them the neighborhood will have mercy if they conduct business elsewhere (commerce is for commercial districts!) Then, sign it from "the PI".

As far as theft of packages and fuel - do you have proof? An enterprising teen thief growing up on that block will have noticed the traffic as well, and would be a fool not to use it for 'cover'.

Now, with those people coming to your door, you oughta have some fun. Invite them in. Either try and sell them some spiderplant or herbs, or ask them to wait for the guy to get home (whilst you call the police).