Middlesex County
URL: https://knowledge.ivjn.us/en/places/ma-middlesex-county.html

Middlesex County is a county in Massachusetts, United States, with county seat Cambridge.

## Administrative divisions

Middlesex County is a county in Massachusetts, United States; the county seat is Cambridge[^uscb2023].

## Basic facts

- State: [Massachusetts](https://knowledge.ivjn.us/en/places/massachusetts.html)
- County seat: Cambridge[^uscb2023]
- Division level: county[^uscb2023]

## Parent division

Located in [Massachusetts](https://knowledge.ivjn.us/en/places/massachusetts.html).

Updated: 2026-10-29

Relations:
- Located in: Massachusetts https://knowledge.ivjn.us/en/places/massachusetts.html
- Contains places: Cambridge https://knowledge.ivjn.us/en/places/ma-cambridge.html

Mentioned in:
- Massachusetts https://knowledge.ivjn.us/en/places/massachusetts.html
- Acton https://knowledge.ivjn.us/en/places/ma-acton.html
- Arlington https://knowledge.ivjn.us/en/places/ma-arlington.html
- Ashby https://knowledge.ivjn.us/en/places/ma-ashby.html
- Ashland https://knowledge.ivjn.us/en/places/ma-ashland.html
- Auburndale https://knowledge.ivjn.us/en/places/ma-auburndale.html
- Ayer https://knowledge.ivjn.us/en/places/ma-ayer.html
- Bedford https://knowledge.ivjn.us/en/places/ma-bedford.html
- Belmont https://knowledge.ivjn.us/en/places/ma-belmont.html
- Bemis https://knowledge.ivjn.us/en/places/ma-bemis.html

Sources:
- Middlesex County (Wikipedia) https://en.wikipedia.org/wiki/Middlesex_County
- U.S. Census Bureau 2023 FIPS state and county codes https://www.census.gov/library/reference/code-lists/ansi.html