[bbno4]

I just had to google this!

For those not in America, SF and LA are counties in the united states of america.

[brk]

Almost. Cities, not counties. San Francisco and Los Angeles specifically. Counties encompass multiple cities.

[0_____0]

They're actually both. Pretty rare but LA and SF exist as both city and county level entities.

[minhaz23]

Except NYC which encompasses multiple counties.

[rrrrrrrrrrrryan]

Eh there's more nuance.

When people outside of LA say "Los Angeles", they're almost always referring to the county. The city of LA is actually quite small.

For "San Diego", it's precisely the opposite - a giant portion of San Diego County is comprised of the city of San Diego, and they're almost always just referring to the city.

And for "San Francisco," the city and the county are basically the same entity and thus have the same borders.