THE MIDDLESEX COUNTY LAND BRIEF
Land in the
Gulf of Maine Coastal Plain setting.
Middlesex County has 817.9 square miles of land in Massachusetts. 4 mapped landscape regions meet across Middlesex County: Gulf of Maine Coastal Plain, Boston Basin, Southern New England Coastal Plains and Hills, among others.
Irregular plains and low hills form a coastal transition with glacial lakes and oak-pine woodland. This northeastern landscape is gentler than the mountainous country farther inland.
Regional context: Northeastern Coastal Zone ↗ · Regional mapping across the county footprint
Where the landscape changes
Middlesex County intersects 4 mapped regional units. The largest mapped shares are:
- Gulf of Maine Coastal Plain69.3%
- Boston Basin22.3%
- Southern New England Coastal Plains and Hills6%
- Worcester/Monadnock Plateau2.4%
Northeastern Highlands in Middlesex County
Forested hills and mountains span northern New England, the Adirondacks and higher Catskills. Glacial lakes and steep streams accompany a transition between northern hardwood and spruce-fir forests.
Read the regional source ↗Finding your parcel within Middlesex County
The atlas lists 78 cities, towns, townships, and Census communities associated with Middlesex County, including Groton, Townsend, Westford. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Middlesex County by land and water
The Census records 29 square miles of water within Middlesex County, or 3.4% of its total area. That share is close to Middlesex County’s 3.4%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Middlesex County has 33.4 times the land area of nearby Concord town (24.5 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Essex County, Norfolk County, Suffolk County, Worcester County within Massachusetts. A tract near one of these lines should be matched to the county identifier on its own records.

