I'm not kidding. Urban areas with a high density of population are always more left-wing than rural areas. Lonely losers are the ones who become incels/groypers and shit. Workers who worked in small businesses with few colleagues were the most likely to support the literal NSDAP in the 30's. The more people you talk to the more likely you are you support left-wing ideas. I just have to make a shit ton of friends and the revolutionary spirit will bring about communism. Wish me luck comrades. Also 
What about small cities/large towns? There are lots of these all over the country, they're way more affordable than the big cities, in many cases they simply are not large enough for a big class dividing line, there are lots of people you can meet and organize with, and there's usually mass transit or relatively short driving distances to the big city for pretty much anything short of regular in-person employment.
You can touch grass far easier: the edge of town is much closer, the center of town is within easy biking distance, you have a lot more in common with everyone you're likely to bump into, and it's easier to exert an influence on city politics.