Marlborough, MA Profile: Facts, Map & Data


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Marlborough, Massachusetts - Basic Facts

The City of Marlborough had a population of 40,232 as of July 1, 2017. Marlborough ranks in the upper quartile for Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Massachusetts. See peer rankings below.

The primary coordinate point for Marlborough is located at latitude 42.3496 and longitude -71.5472 in Middlesex County. The formal boundaries for the City of Marlborough (see map below) encompass a land area of 20.87 sq. miles and a water area of 1.24 sq. miles. Middlesex County is in the Eastern time zone (GMT -5). The elevation is 390 feet.

The City of Marlborough (GNIS ID: 618228) has a C5 Census Class Code which indicates an active incorporated place that is independent of any county subdivision and serves as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

Beneath the boundary map are tables with Marlborough population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

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City of Marlborough, MA Boundary Map

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Marlborough, MA Data & Demographics (As of July 1, 2017)


Total Population 40,232
Daytime Population: Workers 34,840
Daytime Population: Residents 17,340
Total Daytime Population (TDP) 52,180
Ratio TDP/Total Population1 1.30
Population in Households 39,555
Population in Familes 30,735
Population in Group Qrtrs 677
Population Density2 1,928
Diversity Index3 56


Median Household Income $79,127
Average Household Income $102,016
Per Capita Income $40,648


Total Housing Units 16,854 (100%)
Owner Occupied HU 8,772 (52.0%)
Renter Occupied HU 7,121 (42.3%)
Vacant Housing Units 961 ( 5.7%)
Median Home Value $346,729
Average Home Value $379,728


Total Households 15,893
Average Household Size 2.49
Family Households 9,926
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 0.61% 0.73%
Households 0.44% 0.68%
Families 0.36% 0.63%
Median Household Income   2.47%
Per Capita Income   2.43%

Marlborough, MA - Peer Comparisons by Rank and Percentile

The table below compares Marlborough to the other 246 incorporated cities, towns and CDPs in Massachusetts by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 38 85th
Population Density # 88 65th
Diversity Index # 30 88th
Median Household Income # 90 64th
Per Capita Income # 107 57th

Additional comparisons and rankings can be made with a VERY EASY TO USE Massachusetts Census Data Comparison Tool.

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