[jbermingham123]

Every neighborhood/district in the LA basin – every other neighborhood/district in the LA basin.

Forget twins, LA is literally several hundred separate towns and cities:

- Some of these merged to form the city of LA
- Some initially had nothing to do with LA but ended up –willingly or unwillingly– transitioning into suburbs (like nearly every city in Nassau and Westchester Counties, for example)
- More still decided to follow LA's lead and merge into competing large cities, like Riverside, San Bernardino, and Long Beach
- Finally, still more banded together to secede entirely from LA county, forming orange county

To this day, most of these towns and cities are de facto fully independent, with much of their own infrastructure systems, central business districts, and laws. This includes many of the so-called "neighborhoods" that ended up within the LA city limits.

Unlike more centralized cities like Philly, Boston, Chicago, etc, it was a total toss-up that the initial town which ultimately grew into Downtown LA ended up becoming the biggest in the region. "Downtown LA" couldve just as easily sprung up from another town, perhaps where Long Beach is, or maybe where LAX is, or even all the way down where Anaheim is.