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There are quite a few law offices around - the US Census says 773 in Middlesex County, Massachusetts. I looked on OpenStreetMap and found two listed by name. One has a phone number: it's area code is not provided. The other one links to a website; you can find that yourself if you’re interested. These listings are free, by the way. Also, any business owner can claim their page on hashtag.org.
Data: © OpenStreetMap contributors