Driving across the country with an unregistered car.

Whose name is the title in? Yours? To the best of my knowledge, you just need the title with your name on it and the bill of sale [even if it's old, yes this is weird] and then follow http://www.nydmv.state.ny.us/register.htm#outofstate to register the car in NY. This may involve getting a NY title for it which will be a pain but manageable. You could, maybe, get a transit permit which is like a 30 day "I'm moving" permit. http://www.nydmv.state.ny.us/register.htm#temporary Interstate In-Transit Permit -- The permit is valid for 30 days and allows you to transport a vehicle from New York State to another jurisdiction to register it. For example, you need an interstate in-transit permit if you buy a vehicle in NYS, but you reside in another state or you move to another state, and you plan to register the vehicle in the other state. The fee is $10. I'm not even sure it matters that you have a DC license, actually. Then you get the temporary permit, put it on the car, [don't go through Massachusetts!] and then drive to CA in 30 days or less. This may make your car a cop-magnet, but it should be legal.

Here's the http://dmv.ca.gov/pubs/brochures/howto/htvr9.htm

If I'm reading your question correctly, the car was last registered in DC and the title is from DC. In that case, you should get a temporary or in-transit registration from the DC DMV. I don't think you want to go through the hassle of legally moving the car to NY and then moving it again to California. To do this, you'll need a binder of insurance to cover you on the journey. I think you would need to get insurance in DC as well, though if you already have a plan for insurance once you reach California, it might be worthwhile to give that company a call now and see what they can do for you. If you can't get DC insurance, then it should be possible to get a binder in NY (though you may have to get a NY license to make that work).

Thanks for the replies, everyone. To answer a few questions: yes, the car has a clear title in my name, and that title is from DC.

I just purchased a vehicle from a dealer in PA. I live in West Va. The dealer provided me with a 30 day "In Transit" cardboard tag along with paper documentation that he had me sign. He did not charge for that service. I don't know if the DMV can do that for you, or not. But at least I could get the car home and get the title transferred to my state, etc without having the actual car title in hand. I received the title after my check cleared.

I think ssg is right. Easiest would be to do everything in the same state, and since you already have title and driver license from DC, you should probably just register the car and get temporary insurance in DC. The only reason I added this comment is, in case you do NOT follow that advice - I once received an automatic ticket for having a FL plate, CA driver license, and Idaho insurance (while house-hunting in WA, but I don't think that matters). I can't find it on Google now, but apparently you have to have two of those things in the same state.

I got a car (as a gift) in NY. I was able to apply for a NY state "Transfer Registration" which cost me something like $10 and was a paper license plate that goes in the rear window of your car. this makes the car legal to drive to somewhere. I think it is only valid for 30 days. The problem is that, while you don't need the car to be in NY, I think you need to swear that it's in NY... So make sure you can drive it across the border first.