City county answer

What County Is Cambridge In? Local County Guide

Cambridge, Massachusetts is in Middlesex County.

Need to confirm a specific home, business, parcel, or mailing address? Use the address lookup below because city names and ZIP codes can be less precise near county lines.

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County

Middlesex County

State

Massachusetts (MA)

County seat

Lowell and Cambridge

Sample ZIPs

02138, 02139, 02140

Important boundary note

Cambridge sits across the Charles River from Boston, which is in Suffolk County.

Direct answer for Cambridge, MA

Cambridge, Massachusetts is in Middlesex County. The county seat is Lowell and Cambridge. This answer is useful for general research, travel planning, local services, county office lookup, and understanding which local government area serves the city.

Cambridge is one of the county seats historically associated with Middlesex County. For legal, tax, voting, school, or property decisions, check the exact street address because boundaries can differ from mailing labels.

Nearby city context

Nearby cities around Cambridge can sit in the same county or a neighboring county. Use address lookup when your search involves a suburb, business district, county border, or ZIP code edge.

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Frequently asked questions

What county is Cambridge, MA in?

Cambridge, Massachusetts is in Middlesex County.

What is the county seat of Middlesex County?

The county seat is Lowell and Cambridge.

Can a Cambridge ZIP code cross county lines?

ZIP codes are postal delivery areas and can cross local boundaries. Use a full address for official county confirmation.

What ZIP codes are common in Cambridge?

Common ZIP codes include 02138, 02139, 02140, 02141, 02142. Always verify the exact address for county-sensitive tasks.

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