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The City of Marlborough had a population of 41,647 as of 2020-2024 American Community Survey 5-Year Estimates. 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 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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Marlborough Demographic Data
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Marlborough, MA Data & Demographics

Source: 2020-2024 American Community Survey 5-Year Estimates

POPULATION
Total Population	41,647 (100%)
Population Density	1,996 per sq mi
Diversity Index¹	64


INCOME
Median Household Income	$91,968
Per Capita Income	$46,241
Median Home Value	$513,100

HOUSING
Total HU (Housing Units)	17,247 (100%)
Owner Occupied HU	9,336 (54.1%)
Renter Occupied HU	7,329 (42.5%)
Vacant Housing Units	582 (3.4%)

HOUSEHOLDS
Total Households	16,665
Average Household Size	2.46
Family Households	10,491 (63.0%)

NOTES

The Diversity Index estimates the likelihood that two persons chosen at random from the same area belong to different race or ethnic groups, based on five groups: Hispanic/Latino, Non-Hispanic White, Non-Hispanic Black, Non-Hispanic Asian, and Non-Hispanic Other/Multiracial. A value of 0 indicates the population belongs entirely to one group. Higher values indicate a more evenly mixed population. Calculated from U.S. Census Bureau ACS 5-year estimates (table B03002).

Marlborough, MA - Peer Comparisons by Rank and Percentile

The table below compares Marlborough to the other 248 incorporated cities, towns and CDPs in Massachusetts by rank and percentile using 2020-2024 American Community Survey 5-Year Estimates 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	# 84	66th
Median Household Income	# 153	39th
Per Capita Income	# 179	28th
Diversity Index	# 13	95th

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

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Marlborough, MA Profile: Facts & Data

Marlborough, Massachusetts - Basic Facts

Marlborough, MA Data & Demographics

POPULATION

INCOME

HOUSING

HOUSEHOLDS

Marlborough, MA - Peer Comparisons by Rank and Percentile

Marlborough, MA - Most Popular Things to Do

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