What is the most liberal city in Massachusetts?

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Cambridge, hands down. I especially can't really see any argument for Greenfield or North Adams.

This. They're very Democratic, but not all that liberal, compared to some other places.

Northampton definitely gets honorable mention, though.

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I specifically meant the most liberal city in MA, not necessarily the most heavily Democratic. While places can be heavily Democratic, they might be less liberal than others. In California, Hacienda Heights, Long Beach, and Santa Ana are heavily Democratic, but they are less liberal than Berkeley, San Francisco, and Oakland. Oakland elected Barbara Lee (D-CA-13), who is far more liberal than Lou Correa (D-CA-46) of Santa Ana.

Which is why including Greenfield and North Adams as options makes no sense. Those cities do have a lot of liberals, but in Massachusetts I doubt they'd make the top ten.

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I know very little about New England. What do New Englanders refer to places like Hacienda Heights and Jesmond Dene as?

I have never heard of these places, but googling Hacienda Heights brings up a majority-minority city (presumably ultra liberal) and Jesmond Dene as either a park in England or a park in California. What exactly do you mean by "refer to... as"?

Hacienda Heights isn't an incorporated city. It is heavily Democratic, but more traditional Hispanic/white/Asian establishment Clinton Democrats, not Bernie Sanders types. It certainly isn't a hipster town, it's more down-to-earth. I know several people from Hacienda Heights, and I have been there frequently. Hillary Clinton probably defeated Sanders in the primary there. In Hacienda Heights, Trump easily finished second (breaking 20%; probably receiving 23-30%), Johnson came in third, and Stein finished fourth. Look up Jesmond Dene, California on Wikipedia. I have also been there frequently. What I mean by "refer to as", is, would New Englanders refer to these communities as "towns" or would they use some other term for such communities?

Outside of a few very, very remote areas in northern Maine, every square inch of New England is either in a city or a town. Sometimes though, there are places in New England that are settlements on their own, but politically part of a larger city or town. Examples would be Florence (part of Northampton), Turners Falls (part of Montague), Shelburne Falls (part of Shelburne and Buckland), Housatonic (part of Great Barrington), etc. The census calls these CDPs, road maps call them hamlets, I think most people call them either villages or (confusingly) towns.

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Of these cities, Stein got almost 4% in Northampton.

No surprise. It's a good fit for her anyway, and she made a campaign stop there.

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Of these cities, Stein got almost 4% in Northampton.

No surprise. It's a good fit for her anyway, and she made a campaign stop there.

Why did Trump only get about 12% in Northampton, which is over 80% white, but got more than 1/4 of the vote in Hacienda Heights?

Northampton is a college town, considered the "lesbian capital of the world," and is famous for hippies, environmentalists, and other left-wing people. It's a bit like Santa Cruz, California. Not sure what the best SoCal equivalent would be.

I don't know about Hacienda Heights, but it's fairly common for minority-heavy towns to have very conservative white populations.