Well, I lived off 244th Street in Los Angeles County, and I thought that was pretty high. It goes up to at least 266th Street in that area, before it goes down to small numbers in San Pedro.
I thought I'd see what Google could find for me. I gave up on this one, 2075th Avenue, near the town of West York, Illinois.
This map will show you some of those high-roller locations...

-Joe-