Marlborough, St. Louis County, MO demographics:
population, income, and more

Total population
2,157
-8.8% year-over-year change
Median household income
$50,300/yr
7.0% year-over-year change
Housing units
1,570
-6.2% year-over-year change

Marlborough population

How many people live in Marlborough

Marlborough is home to 2,157 residents, according to the most recent Census data. Gender-wise, 43.8% of Marlborough locals are male, and 56.2% are female.

Total population
2,157
-8.8% year-over-year change
Gender ratio
Male
43.8%
945
Female
56.2%
1,212
Value Percent YoY change
Male 945 43.8% -21.4%
Female 1,212 56.2% 4.2%
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 Marlborough is 32, with the population distributed as follows: about 5.7% are children under 15, then 20.9% are in the 15 to 24 age group. Adults between 25 and 44 make up 47.4% of the population, while another 11.1% fall into the 45 to 64 bracket. Finally, around 14.9% are 65 or older.

Median age
32.3
Age breakdown
Under 15
5.7%
15 to 24
20.9%
25 to 44
47.4%
45 to 64
11.1%
Over 65
14.9%
Value Percent YoY change
Under 15 123 5.7% -13.4%
15 to 24 451 20.9% -8.5%
25 to 44 1,023 47.4% -9.2%
45 to 64 239 11.1% -16.1%
Over 65 321 14.9% 0.3%
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 Marlborough, 91.8% of the population are US-born citizens, while 7% have gained naturalized citizenship. At the same time, 1.3% of residents are non-citizens. As for race, 72.9% of locals are Caucasian, 12.5% are African American and 3.4% have Asian roots. There’s also a share of 11.2% that includes residents with two or more races.

Citizenship
U.S.-born citizens
91.8%
Non-U.S.-born citizens
7%
Non-citizens
1.3%
Value Percent YoY change
U.S.-born citizens 1,979 91.8% -9.9%
Non-U.S.-born citizens 150 7% 7.1%
Non-citizens 28 1.3% -6.7%
Racial breakdown
White
72.9%
Black or African American
12.5%
American Indian and Alaska Native
0%
Asian
3.4%
Native Hawaiian and other Pacific Islander
0%
Two or more races
11.2%
Other
0%
Value Percent
White 1,573 72.9%
Black or African American 269 12.5%
Asian 74 3.4%
Two or more races 241 11.2%

Households in Marlborough

A peek inside Marlborough households

Marlborough has 1,340 households, with an average of 2 members in each. Of these, 38.9% are families, while the remaining 61.1% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
1,340
-8.2% year-over-year change
Average people per household
2
Non-family households
819
Family households
521
Value Percent YoY change
Non-family households 819 61.1% -13.7%
Family households 521 38.9% 2.2%
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 Marlborough

The housing landscape of Marlborough

Marlborough's housing consists of 1,570 units, with 29.2% being detached single-family homes ideal for those wanting space.

Housing units
1,570
-6.2% year-over-year change
Housing types
Value Percent
1 unit, detached 458 29.2%
2 units 32 2%
3 or 4 units 224 14.3%
5 to 9 units 484 30.8%
10 to 19 units 246 15.7%
20 to 49 units 46 2.9%
50 or more units 80 5.1%
Homes built since 2020
62
% year-over-year change

The age of buildings in Marlborough

In Marlborough, the median construction year is 1967. About 4% of homes were built before the 1940s, with another 3.3% going up by 1949. Most development happened in the second half of the 20th century.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 62 4% 72.2%
Built between 1940 and 1949 52 3.3% -28.8%
Built between 1950 and 1959 240 15.3% -14.9%
Built between 1960 and 1969 599 38.2% -9.1%
Built between 1970 and 1979 221 14.1% -17.8%
Built between 1980 and 1989 189 12% 39.0%
Built between 1990 and 1999 130 8.3% -33.7%
Built between 2010 and 2019 15 1% -34.8%
Built in 2020 or later 62 4% N/A
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.

Marlborough occupancy rates

Out of the 1,340 occupied housing units in Marlborough, 12.9% are owner-occupied, while 87.1% are lived in by tenants. Meanwhile, 14.6% of all homes on the local market sit vacant.

Occupied housing units
1,340
-8.2% year-over-year change
Occupancy breakdown
Renter occupied
1,167
Owner occupied
173
Value Percent YoY
change
Renter occupied 1,167 87.1% -11.2%
Owner occupied 173 12.9% 19.3%
Unoccupied housing units
14.6%
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.

Marlborough housing costs

Housing costs in Marlborough come to a median of $990 per month, while tenants specifically pay a median gross rent of $990.

Median housing costs per month
$990/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 Marlborough
$990/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 Marlborough

Marlborough education at a glance

About 41.9% of the population in Marlborough went to high school, while 13.9% pursued college studies. Another 14.7% earned an associate degree and 18.3% hold a bachelor’s. Meanwhile, 11.2% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
High school diploma 832 41.9% 11.7%
College diploma 276 13.9% -42.1%
Associate degree 292 14.7% -1.4%
Bachelor's degree 363 18.3% -28.4%
Graduate degree 223 11.2% 43.0%
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 Marlborough

How much people earn in Marlborough

The average annual household income in Marlborough was $65,698 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +11.6% change from the previous year. At the same time, the median income stood at $50,300, reflecting a +7% shift over the same period.

Average household income in Marlborough
$65,698/year
11.6% year-over-year change
Median household income in Marlborough
$50,300/year
7.0% year-over-year change

Marlborough income by age

In Marlborough, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $47,833. Those with someone between 45 and 64 in charge, often well established professionally, earn $68,705 overall. Overall, 95.3% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
Under 25 $26,809 N/A
25 - 44 $47,833 4.7%
45 - 64 $68,705 16.2%
Above poverty level
2,039
Below poverty level
100
Value Percent YoY
change
Above poverty level 2,039 95.3% -5.2%
Below poverty level 100 4.7% -42.5%

Employment in Marlborough

Workforce and job types in Marlborough

The job market in Marlborough is powered by 1,621 working residents, spread across a range of industries and roles. 79.5% of the working population are employed in professional or administrative positions, while 20.5% are in hands-on or service-based jobs.

Workforce demographics

Working population
1,621
-8.4% year-over-year change
White collar
1,288
Blue collar
333
Value Percent YoY change
White collar 1,288 79.5% -3.5%
Blue collar 333 20.5% -23.3%
Employer type
Self employees
0%
Private companies
64.9%
Governmental workers
18.8%
Not for profit companies
16.3%
Value Percent YoY change
Private companies 1,052 64.9% -11.2%
Governmental workers 305 18.8% 51.0%
Not for profit companies 264 16.3% -30.9%
Unemployment rate
0.7%
-82.0% year-over-year change

Available workforce

The unemployment rate in Marlborough stands at 0.7%, representing the share of the workforce currently without a job and actively looking for one.

For renters, the unemployment rate helps paint a picture of job security and financial stability in the area. Rates around 4% to 5% are considered typical. A lower-than-average rate might suggest strong job prospects and a thriving local economy, while a higher rate could hint at fewer opportunities—both useful to consider when planning a move.

Transportation in Marlborough

How people get around in Marlborough

Means of transportation
Value Percent YoY change
Car 1,370 83% -6.9%
Taxicab 26 1.6% N/A
Bus or trolleybus 49 3% 4.3%
Subway or elevated 19 1.2% N/A
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 Marlborough by zipcode?

Zipcode Population Number of households Median income Average income
63119 34,181 14,476 $106,183 $148,148
63123 49,077 21,755 $77,055 $97,841

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FAQs about Marlborough demographics 

What is the total population of Marlborough?

Marlborough has a total population of 2,157 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 -8.8% compared to a year ago.

What is the gender ratio in Marlborough?

The gender ratio in Marlborough is as follows:
  • 43.8% males (945 residents)
  • 56.2% females (1,212 residents)

What is the median age in Marlborough?

The median age in Marlborough is 32.3.

What is the age distribution of the population in Marlborough?

The age distribution in Marlborough is as follows:
  • Under 15: 5.7% (123 residents)
  • Ages 15-24: 20.9% (451 residents)
  • Ages 25-44: 47.4% (1,023 residents)
  • Ages 45-64: 11.1% (239 residents)
  • Over 65: 14.9% (321 residents)

What is the racial and ethnic makeup of Marlborough?

The racial and ethnic makeup of Marlborough is as follows:
  • White: 72.9% (1,573 residents)
  • Black or African American: 12.5% (269 residents)
  • American Indian and Alaska Native: 0% (0 residents)
  • Asian: 3.4% (74 residents)
  • Native Hawaiian and Other Pacific Islander: 0% (0 residents)
  • Two or More Races: 11.2% (241 residents)
  • Other: 0% (0 residents)

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

U.S.-born citizens represent 91.8% of the population in Marlborough.

How many housing units are there in Marlborough?

There are 1,570 housing units in Marlborough, reflecting a -6.2% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

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

Marlborough has a total of 1,340 households, with an average of 2 people in each.

What is the median household income in Marlborough?

Marlborough has a median household income of $50,300, representing a +7.0% shift from the previous year, according to the U.S. Census Bureau.

What is the employment rate and job market overview for Marlborough?

The employment rate is 99.3% in Marlborough, with a workforce of 1,621 residents. Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 79.5% (1,288 residents)
  • Blue-collar workers: 20.5% (333 residents)

Places of employment:
  • Self-employed: 0% (0 residents)
  • Private companies: 64.9% (1,052 residents)
  • Governmental workers: 18.8% (305 residents)
  • Not-for-profit companies: 16.3% (264 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