Middlesex County is lying in the state of Massachusetts. With an area of 847 square miles, Middlesex County is one of the larger counties in the state, while in population it is at the top with 146,539 residents. Middlesex County's population density of urban makes it one of the least thickly populated areas in the state. The county's largest city is Lowell, with a population of 105,167.
Middlesex County is one of the most affluent regions in the state. The median income for Middlesex County residents is $64,190, putting the area in in the top fifth of all counties in Massachusetts. In keeping with this, the average house value in Middlesex County is $262,601, well above the state average of $202,794.
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