617 Area Code: Boston, Massachusetts

Boston is the primary city of the 617 area code, the long-running designation for the city itself and the inner ring of immediately adjacent communities. Boston sits at the bottom of Boston Harbor on a peninsula that has been steadily expanded by landfill since the seventeenth century, organized around a famously dense downtown grid that retains its colonial street pattern beneath the modern overlay. The local working economy reflects an unusually concentrated mix of higher education, biomedical research, finance, and healthcare, anchored by some of the country's largest universities and teaching hospitals. The 617 footprint covers Boston, Cambridge, Brookline, and the immediate surrounding cities.

Records linked to 617 numbers in the directory often include other Massachusetts cities — Lowell, Quincy, Springfield, and Worcester among them. None of those are inside the 617 footprint. The pattern reflects standard public-record dynamics, with phone numbers porting across Massachusetts and addresses linked across multiple cities. The directory currently documents 617 distinct prefixes within 617 in detail, a working subset of the prefix population the code carries.

Boston's median age sits well under the US figure, in the low thirties, a pattern shaped by the substantial student population that fills the surrounding universities. Home values run roughly twice the US median, household income comes in well above the national reading, and population places Boston among the larger New England cities — the anchor of a metropolitan area that pulls steadily on populations from across the broader Northeast.