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A big enough population allows you anonymity to be nonconforming, iconoclastic, or otherwise depart from the norms without it being well-known to all. Of course, if you deliberately choose to break that level of "flying below the radar" by, say, putting out a yard sign you will lose a lot of that benefit. Although as was pointed out, it's not like conservatives don't exist altogether in Seattle - they're just deeply in the minority. But for the most part, you can keep things like your political leanings largely hidden in a large city - at least, to a much larger degree than in a small town.
Except this is true in the reverse. Unless you went out and loudly told everyone in a small red town that you were an ardent Joe Biden supporter you'd also fly under the radar.
Anyone can be anonymous to a degree...what matters is the degree.