Richmond

Although Richmond is technically a part of Contra Costa County, it really feels much more like an Alameda County city. It is far more urban than suburban, it tends to be more working class than middle class, and it tends to have higher crime stats than most places in Contra Costa. It also has a view of the Bay whereas most of the rest of Contra Costa is inland. The 580 runs through it, whereas the 680 runs through all the rest of Contra Costa. It tends to stay cooler than most of inland Contra Costa. The cost of living is lower than in Contra Costa as well. Richmond is also the final stop on the end of the line that runs up through Alameda county, where as most of the BART stops in Contra Costa come on a different line.

Put simply, Contra Costa County should cede Richmond to Alameda County and Alameda County should cede Dublin to Contra Costa County. That would make both counties more consistent. Of course, the same argument could be made in reverse, I guess—maybe we don’t want to have a county that is too much alike.