Most liberal city in California

[Schiff for Senate]

Worth noting Trump came in third in Berkeley in 2016, which is something that happened in very few other cities and locales (no matter how Democratic) in the country.

Third?!?! Who beat him (other than Clinton, I mean)? Gary Johnson would make sense in most circumstances, since he beat all other third-party/independent candidates (Evan McMullin would make sense in a hypothetical, heavily Mormon town - though then again, Trump would still beat Clinton in such a jurisdiction), but I can actually see Jill Stein (given how progressive Berkeley is) coming second in the city.

(Interestingly, there was a county in which Jill Stein beat Donald Trump, and by a gigantic amount - the miniscule Kalawoa County, the second-smallest county by population with 82 residents and smallest county by area, cast 20 votes altogether in 2016 - 14 for Clinton, 5 for Stein and one for Trump. In 2020, Biden beat Trump 23-1 in the county, with zero votes cast for any other candidate.)

[Schiff for Senate]

Worth noting Trump came in third in Berkeley in 2016, which is something that happened in very few other cities and locales (no matter how Democratic) in the country.

Third?!?! Who beat him (other than Clinton, I mean)? Gary Johnson would make sense in most circumstances, since he beat all other third-party/independent candidates (Evan McMullin would make sense in a hypothetical, heavily Mormon town - though then again, Trump would still beat Clinton in such a jurisdiction), but I can actually see Jill Stein (given how progressive Berkeley is) coming second in the city.

Jill Stein came in second. She also came close in Oakland.

Berkeley
Clinton       57,750    90.4%
Stein            2,947      4.6%
Trump          2,031      3.2%

Oakland
Clinton     158,926    89.4%
Trump          8,470      4.8%
Stein            6,816      3.8%


As for OP's question, it's a tossup between Berkeley & Arcata. If I had to pick, I'd go with Arcata. And no, it has nothing to do with OP's disturbing obsession with the 2018 CA Senate results.


Fun fact: Jill Stein got 10.1% in Arcata, the only California town she got double-digits in. Point Arena is close behind at 9.7%

Wouldn't be surprised if Arcata was her best city nationwide (Kalawoa County exempted).

Yeah, the thing about Kalawoa County that allows it to be this extreme (going from giving 25% of the vote to the Greens to giving it 0%) is the fact that its population is extremely small compared to moderately large cities like Oakland. I don't think there's a single city with a population of over, say, 1,000, that gave Stein that much. What you need to remember is that 25% in Kalawoa is still just five voters, whereas garnering 25% in a place like Arcata would mean getting way more raw votes for Stein. I'm sure there are a few neighbourhoods with populations similar to Kalawoa that gave Stein 25%.