Wal-Mart has tried to build “city stores” like Target, and they all mostly failed. Within cities like Boston or NYC, Wal-Mart simply has too bad a reputation of ruining local economies and paying substandard wages. They weren’t drawing enough customers to justify expenses, they weren’t attracting enough workers. Most city residents preferred groceries at an actual grocery store - and other goods at Marshall’s and TJ Maxx (which, btw, do great here). For everything else, there’s Amazon.

As well, there is a Wal-Mart in nearby Quincy, Lynn and a massive one in Saugus. These are Boston suburbs no different than Watertown, and heck - Quincy has T access. You don’t have to go far to get your Walton fix.