Assembly Square, Somerville, MA demographics:
population, income, and more

Total population
6,151
-1.6% year-over-year change
Median household income
$123,755/yr
3.9% year-over-year change
Housing units
2,805
-1.0% year-over-year change

Assembly Square population

How many people live in Assembly Square

Assembly Square is home to 6,151 residents, according to the most recent Census data. Gender-wise, 51.8% of Assembly Square locals are male, and 48.2% are female.

Total population
6,151
-1.6% year-over-year change
Gender ratio
Male
51.8%
3,186
Female
48.2%
2,965
Value Percent YoY change
Male 3,186 51.8% -1.3%
Female 2,965 48.2% -1.9%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in Assembly Square is 33, with the population distributed as follows: about 10.9% are children under 15, then 11.2% are in the 15 to 24 age group. Adults between 25 and 44 make up 47.6% of the population, while another 18.4% fall into the 45 to 64 bracket. Finally, around 12% are 65 or older.

Median age
33.3
Age breakdown
Under 15
10.9%
15 to 24
11.2%
25 to 44
47.6%
45 to 64
18.4%
Over 65
12%
Value Percent YoY change
Under 15 671 10.9% 4.5%
15 to 24 690 11.2% -11.9%
25 to 44 2,925 47.6% 0.2%
45 to 64 1,130 18.4% -11.3%
Over 65 735 12% 16.5%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

In Assembly Square, 65.7% of the population are US-born citizens, while 17.2% have gained naturalized citizenship. At the same time, 17% of residents are non-citizens. As for race, 58.8% of locals are Caucasian, 6% are African American and 12.4% have Asian roots. There’s also a share of 13% that includes residents with two or more races.

Citizenship
U.S.-born citizens
65.7%
Non-U.S.-born citizens
17.2%
Non-citizens
17%
Value Percent YoY change
U.S.-born citizens 4,043 65.7% -0.5%
Non-U.S.-born citizens 1,060 17.2% -1.9%
Non-citizens 1,049 17% -5.1%
Racial breakdown
White
58.8%
Black or African American
6%
American Indian and Alaska Native
0%
Asian
12.4%
Native Hawaiian and other Pacific Islander
0%
Two or more races
13%
Other
9.7%
Value Percent
White 3,617 58.8%
Black or African American 370 6%
American Indian and Alaska Native 2 0%
Asian 765 12.4%
Two or more races 798 13%
Other 598 9.7%

Households in Assembly Square

A peek inside Assembly Square households

Assembly Square has 2,671 households, with an average of 2 members in each. Of these, 44.1% are families, while the remaining 55.9% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
2,671
-0.1% year-over-year change
Average people per household
2
Non-family households
1,492
Family households
1,179
Value Percent YoY change
Non-family households 1,492 55.9% 3.0%
Family households 1,179 44.1% -3.7%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in Assembly Square

The housing landscape of Assembly Square

Assembly Square's housing consists of 2,805 units, with 12% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 6.5% and offer a more compact, shared living style. Then there are the multifamily buildings in the area, and for those seeking flexibility, non-traditional options like mobile homes account for 0.4% of the housing landscape.

Housing units
2,805
-1.0% year-over-year change
Housing types
Value Percent
1 unit, detached 338 12%
1 unit, attached 183 6.5%
2 units 614 21.9%
3 or 4 units 715 25.5%
5 to 9 units 253 9%
10 to 19 units 145 5.2%
20 to 49 units 104 3.7%
50 or more units 441 15.7%
Mobile home 11 0.4%
Homes built since 2020
75
66.7% year-over-year change

The age of buildings in Assembly Square

In Assembly Square, the median construction year is 1938. About 54.3% of homes were built before the 1940s, with another 3.6% going up by 1949. Most development happened in the second half of the 20th century. Then, 1.3% of homes were added from 2000 to 2009, 12.5% between 2010 and 2019, and 2.7% are part of the newest wave of development.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 1,523 54.3% -3.7%
Built between 1940 and 1949 100 3.6% -16.0%
Built between 1950 and 1959 138 4.9% 16.0%
Built between 1960 and 1969 127 4.5% -20.6%
Built between 1970 and 1979 201 7.2% 5.8%
Built between 1980 and 1989 133 4.7% -2.2%
Built between 1990 and 1999 121 4.3% 11.0%
Built between 2000 and 2009 37 1.3% 19.4%
Built between 2010 and 2019 350 12.5% 2.3%
Built in 2020 or later 75 2.7% 66.7%
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

Assembly Square occupancy rates

Out of the 2,671 occupied housing units in Assembly Square, 35.6% are owner-occupied, while 64.4% are lived in by tenants. Meanwhile, 4.8% of all homes on the local market sit vacant.

Occupied housing units
2,671
-0.1% year-over-year change
Occupancy breakdown
Renter occupied
1,721
Owner occupied
951
Value Percent YoY
change
Renter occupied 1,721 64.4% -2.0%
Owner occupied 951 35.6% 3.7%
Unoccupied housing units
4.8%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

Assembly Square housing costs

Housing costs in Assembly Square come to a median of $2,434 per month, while tenants specifically pay a median gross rent of $2,398.

Median housing costs per month
$2,434/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.
Median gross rent in Assembly Square
$2,398/month
Gross rent gives a more complete look at what renters actually pay, including not just base rent, but also utilities and fees. It’s a key number for evaluating rental affordability in your area of interest and understanding how it compares to nearby locations.

Education in Assembly Square

Assembly Square education at a glance

About 20.8% of the population in Assembly Square went to high school, while 9.2% pursued college studies. Another 5.2% earned an associate degree and 32.4% hold a bachelor’s. Meanwhile, 24.9% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 406 7.6% 7.1%
High school diploma 1,117 20.8% -7.8%
College diploma 496 9.2% -15.2%
Associate degree 277 5.2% 0.0%
Bachelor's degree 1,742 32.4% -0.6%
Graduate degree 1,342 24.9% 4.0%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in Assembly Square

How much people earn in Assembly Square

The average annual household income in Assembly Square was $150,284 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +2.3% change from the previous year. At the same time, the median income stood at $123,755, reflecting a +3.8% shift over the same period.

Average household income in Assembly Square
$150,284/year
2.3% year-over-year change
Median household income in Assembly Square
$123,755/year
3.9% year-over-year change

Assembly Square income by age

In Assembly Square, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $147,254. Those with someone between 45 and 64 in charge, often well established professionally, earn $127,624 overall. Younger households, where the main provider is under 25 and just starting out, report a median income of $121,154, while those led by someone over 65, many of whom may be retired, have about $34,758 in earnings. Overall, 90% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
Under 25 $121,154 -3.0%
25 - 44 $147,254 0.6%
45 - 64 $127,624 9.1%
Over 65 $34,758 3.3%
Above poverty level
5,466
Below poverty level
605
Value Percent YoY
change
Above poverty level 5,466 90% -0.3%
Below poverty level 605 10% -9.2%

Employment in Assembly Square

Workforce and job types in Assembly Square

88.7% of the working population are employed in professional or administrative positions, while 11.3% are in hands-on or service-based jobs. Also, 6.8% run their own businesses, 65.1% are employed by private companies, and 10% work in the public sector.

Workforce demographics

White collar
3,615
Blue collar
459
Value Percent YoY change
White collar 3,615 88.7% -3.0%
Blue collar 459 11.3% -5.2%
Employer type
Self employees
6.8%
Private companies
65.1%
Governmental workers
10%
Not for profit companies
18.1%
Value Percent YoY change
Self employees 277 6.8% -2.5%
Private companies 2,654 65.1% -4.6%
Governmental workers 407 10% 20.8%
Not for profit companies 736 18.1% -8.9%

Transportation in Assembly Square

How people get around in Assembly Square

In Assembly Square, the average commute time is 7 minutes. Commuting methods vary: 73.5% of residents travel by personal vehicle and 7.2% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Commute time
7 min
0.0% year-over-year change
Means of transportation
Value Percent YoY change
Car 1,684 73.5% -6.7%
Taxicab 18 0.8% -43.8%
Bus or trolleybus 276 12% 13.1%
Railroad 11 0.5% -26.7%
Motorcycle 2 0.1% 100.0%
Bicycle 136 5.9% -35.5%
Walk 165 7.2% -25.0%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

What is the median and average household income in Assembly Square by zipcode?

Zipcode Population Number of households Median income Average income
02145 27,495 11,940 $123,755 $150,284

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FAQs about Assembly Square demographics 

What is the total population of Assembly Square?

Assembly Square has a total population of 6,151 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by -1.6% compared to a year ago.

What is the gender ratio in Assembly Square?

The gender ratio in Assembly Square is as follows:
  • 51.8% males (3,186 residents)
  • 48.2% females (2,965 residents)

What is the median age in Assembly Square?

The median age in Assembly Square is 33.3.

What is the age distribution of the population in Assembly Square?

The age distribution in Assembly Square is as follows:
  • Under 15: 10.9% (671 residents)
  • Ages 15-24: 11.2% (690 residents)
  • Ages 25-44: 47.6% (2,925 residents)
  • Ages 45-64: 18.4% (1,130 residents)
  • Over 65: 12% (735 residents)

What is the racial and ethnic makeup of Assembly Square?

The racial and ethnic makeup of Assembly Square is as follows:
  • White: 58.8% (3,617 residents)
  • Black or African American: 6% (370 residents)
  • American Indian and Alaska Native: 0% (2 residents)
  • Asian: 12.4% (765 residents)
  • Native Hawaiian and Other Pacific Islander: 0% ( residents)
  • Two or More Races: 13% (798 residents)
  • Other: 9.7% (598 residents)

What percentage of the population in Assembly Square are U.S.-born citizens?

U.S.-born citizens represent 65.7% of the population in Assembly Square.

How many housing units are there in Assembly Square?

There are 2,805 housing units in Assembly Square, reflecting a -1.0% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in Assembly Square and what is the average household size?

Assembly Square has a total of 2,671 households, with an average of 2 people in each.

What is the median household income in Assembly Square?

Assembly Square has a median household income of $123,755, representing a +3.9% shift from the previous year, according to the U.S. Census Bureau.

What is the job market overview for Assembly Square?

Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 88.7% (3,615 residents)
  • Blue-collar workers: 11.3% (459 residents)

Places of employment:
  • Self-employed: 6.8% (277 residents)
  • Private companies: 65.1% (2,654 residents)
  • Governmental workers: 10% (407 residents)
  • Not-for-profit companies: 18.1% (736 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025