Marlborough, MA Profile: Facts & Data


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Marlborough, Massachusetts - Basic Facts

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The City of Marlborough had a population of 40,733 as of July 1, 2021. 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 42.3459 and longitude -71.5523 in Middlesex County. The formal boundaries for the City of Marlborough 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 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.

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  1. Marlborough 2021 Demographic Data
  2. Growth Rates for Marlborough (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. Massachusetts Research Tools (Easy Tools & Current Data)
  3. Massachusetts Data Comparison Tool - 2021 Demographics

Marlborough, MA Data & Demographics (As of July 1, 2021)


Total Population 40,733 (100%)
Population in Households 40,067 (98.4%)
Population in Families 31,065 (76.3%)
Population in Group Quarters1 666 ( 1.6%)
Population Density 1,953
Diversity Index2 59


Median Household Income $85,750
Average Household Income $115,167
% of Income for Mortgage4 21%
Per Capita Income $45,755
Wealth Index5 125


Total HU (Housing Units) 17,408 (100%)
Owner Occupied HU 9,114 (52.4%)
Renter Occupied HU 7,059 (40.6%)
Vacant Housing Units 1,235 ( 7.1%)
Median Home Value $435,948
Average Home Value $472,284
Housing Affordability Index3 100


Total Households 16,173
Average Household Size 2.48
Family Households 10,107
Average Family Size 3
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  2. 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 races 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.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.


2010-2021 2021-2026
Population 0.5% 0.44%
Households 0.44% 0.43%
Families 0.39% 0.42%
Median Household Income   2.25%
Per Capita Income   2.45%
Owner Occupied HU   0.88%

Marlborough, MA - Peer Comparisons by Rank and Percentile

The table below compares Marlborough to the other 245 incorporated cities, towns and CDPs in Massachusetts by rank and percentile using July 1, 2021 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 # 36 86th
Population Density # 86 65th
Median Household Income # 108 56th
Housing Affordability Index # 114 47th
Per Capita Income # 103 58th
Diversity Index # 33 87th

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

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