Killingly, CT demographics:
population, income, and more

Total population
17,137
0.3% year-over-year change
Median household income
$88,200/yr
9.5% year-over-year change
Housing units
7,350
-1.4% year-over-year change

Killingly population

How many people live in Killingly

Killingly is home to 17,137 residents, according to the most recent Census data. Gender-wise, 48.4% of Killingly locals are male, and 51.6% are female.

Total population
17,137
0.3% year-over-year change
Gender ratio
Male
48.4%
8,301
Female
51.6%
8,836
Value Percent YoY change
Male 8,301 48.4% 1.4%
Female 8,836 51.6% -0.7%
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 Killingly is 38, with the population distributed as follows: about 17.4% are children under 15, then 8.1% are in the 15 to 24 age group. Adults between 25 and 44 make up 32.5% of the population, while another 22.4% fall into the 45 to 64 bracket. Finally, around 19.6% are 65 or older.

Median age
38
Age breakdown
Under 15
17.4%
15 to 24
8.1%
25 to 44
32.5%
45 to 64
22.4%
Over 65
19.6%
Value Percent YoY change
Under 15 2,988 17.4% 2.8%
15 to 24 1,385 8.1% -12.4%
25 to 44 5,567 32.5% 6.1%
45 to 64 3,846 22.4% -11.2%
Over 65 3,351 19.6% 11.3%
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 Killingly, 94.3% of the population are US-born citizens, while 2.8% have gained naturalized citizenship. At the same time, 2.9% of residents are non-citizens. As for race, 86.2% of locals are Caucasian, 2.8% are African American and 0.8% have Asian roots. Another 0.4% are Indigenous American, 0.1% are Pacific Islanders, while 2.6% identify as another race. There’s also a share of 7.2% that includes residents with two or more races.

Citizenship
U.S.-born citizens
94.3%
Non-U.S.-born citizens
2.8%
Non-citizens
2.9%
Value Percent YoY change
U.S.-born citizens 16,153 94.3% 0.1%
Non-U.S.-born citizens 481 2.8% -7.5%
Non-citizens 503 2.9% 16.4%
Racial breakdown
White
86.2%
Black or African American
2.8%
American Indian and Alaska Native
0.4%
Asian
0.8%
Native Hawaiian and other Pacific Islander
0.1%
Two or more races
7.2%
Other
2.6%
Value Percent
White 14,771 86.2%
Black or African American 483 2.8%
American Indian and Alaska Native 60 0.4%
Asian 135 0.8%
Native Hawaiian and other Pacific Islander 13 0.1%
Two or more races 1,235 7.2%
Other 440 2.6%

Households in Killingly

A peek inside Killingly households

Killingly has 6,990 households, with an average of 2 members in each. Of these, 63% are families, while the remaining 37% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
6,990
1.2% year-over-year change
Average people per household
2
Non-family households
2,585
Family households
4,404
Value Percent YoY change
Non-family households 2,585 37% -1.1%
Family households 4,404 63% 2.5%
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 Killingly

The housing landscape of Killingly

Killingly's housing consists of 7,350 units, with 66.7% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 4.3% 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 2% of the housing landscape.

Housing units
7,350
-1.4% year-over-year change
Housing types
Value Percent
1 unit, detached 4,901 66.7%
1 unit, attached 316 4.3%
2 units 611 8.3%
3 or 4 units 483 6.6%
5 to 9 units 566 7.7%
10 to 19 units 122 1.7%
20 to 49 units 182 2.5%
50 or more units 25 0.3%
Mobile home 145 2%
Homes built since 2020
60
53.9% year-over-year change

The age of buildings in Killingly

In Killingly, the median construction year is 1951. About 22.4% of homes were built before the 1940s, with another 5.3% going up by 1949. Most development happened in the second half of the 20th century. Then, 9.7% of homes were added from 2000 to 2009, 5.2% between 2010 and 2019, and 0.8% are part of the newest wave of development.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 1,643 22.4% -9.4%
Built between 1940 and 1949 391 5.3% 4.3%
Built between 1950 and 1959 829 11.3% 0.2%
Built between 1960 and 1969 995 13.5% 8.7%
Built between 1970 and 1979 1,070 14.6% 8.2%
Built between 1980 and 1989 654 8.9% 2.4%
Built between 1990 and 1999 612 8.3% -20.3%
Built between 2000 and 2009 714 9.7% -0.7%
Built between 2010 and 2019 382 5.2% 2.1%
Built in 2020 or later 60 0.8% 53.9%
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.

Killingly occupancy rates

Out of the 6,990 occupied housing units in Killingly, 71.9% are owner-occupied, while 28.1% are lived in by tenants. Meanwhile, 4.9% of all homes on the local market sit vacant.

Occupied housing units
6,990
1.2% year-over-year change
Occupancy breakdown
Renter occupied
1,964
Owner occupied
5,026
Value Percent YoY
change
Renter occupied 1,964 28.1% -6.4%
Owner occupied 5,026 71.9% 4.5%
Unoccupied housing units
4.9%
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.

Killingly housing costs

Housing costs in Killingly come to a median of $1,383 per month, while tenants specifically pay a median gross rent of $1,016.

Median housing costs per month
$1,383/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 Killingly
$1,016/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 Killingly

Killingly education at a glance

About 41.4% of the population in Killingly went to high school, while 22.9% pursued college studies. Another 10.5% earned an associate degree and 14.2% hold a bachelor’s. Meanwhile, 8.6% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 326 2.4% -12.4%
High school diploma 5,669 41.4% -2.9%
College diploma 3,143 22.9% 13.6%
Associate degree 1,444 10.5% -2.8%
Bachelor's degree 1,950 14.2% 0.8%
Graduate degree 1,177 8.6% -9.0%
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 Killingly

How much people earn in Killingly

The average annual household income in Killingly was $99,439 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +3.8% change from the previous year. At the same time, the median income stood at $88,200, reflecting a +9.5% shift over the same period.

Average household income in Killingly
$99,439/year
3.8% year-over-year change
Median household income in Killingly
$88,200/year
9.5% year-over-year change

Killingly income by age

In Killingly, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $96,582. Those with someone between 45 and 64 in charge, often well established professionally, earn $102,818 overall. Younger households, where the main provider is under 25 and just starting out, report a median income of $84,125, while those led by someone over 65, many of whom may be retired, have about $67,904 in earnings. Overall, 89% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
Under 25 $84,125 N/A
25 - 44 $96,582 9.9%
45 - 64 $102,818 6.1%
Over 65 $67,904 21.1%
Above poverty level
15,018
Below poverty level
1,858
Value Percent YoY
change
Above poverty level 15,018 89% 4.7%
Below poverty level 1,858 11% -23.0%

Employment in Killingly

Workforce and job types in Killingly

75.5% of the working population are employed in professional or administrative positions, while 24.5% are in hands-on or service-based jobs. Also, 5.1% run their own businesses, 69.2% are employed by private companies, and 16.8% work in the public sector.

Workforce demographics

White collar
6,333
Blue collar
2,060
Value Percent YoY change
White collar 6,333 75.5% 2.7%
Blue collar 2,060 24.5% -5.6%
Employer type
Self employees
5.1%
Private companies
69.2%
Governmental workers
16.8%
Not for profit companies
9%
Value Percent YoY change
Self employees 425 5.1% 11.8%
Private companies 5,807 69.2% -0.8%
Governmental workers 1,409 16.8% 0.7%
Not for profit companies 752 9% 5.0%

Transportation in Killingly

How people get around in Killingly

In Killingly, the average commute time is 82 minutes. Commuting methods vary: 98.7% of residents travel by personal vehicle and 0.9% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Commute time
82 min
9.3% year-over-year change
Means of transportation
Value Percent YoY change
Car 7,144 98.7% -2.3%
Railroad 29 0.4% 0.0%
Walk 67 0.9% 63.4%
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 Killingly by zipcode?

Zipcode Population Number of households Median income Average income
06241 6,585 2,740 $88,389 $106,975
06243 83 20 $122,083 $127,960
06263 498 137 $88,011 $76,299
06239 11,185 4,591 $74,267 $88,777

Explore more communities

FAQs about Killingly demographics 

What is the total population of Killingly?

Killingly has a total population of 17,137 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 +0.3% compared to a year ago.

What is the gender ratio in Killingly?

The gender ratio in Killingly is as follows:
  • 48.4% males (8,301 residents)
  • 51.6% females (8,836 residents)

What is the median age in Killingly?

The median age in Killingly is 38.

What is the age distribution of the population in Killingly?

The age distribution in Killingly is as follows:
  • Under 15: 17.4% (2,988 residents)
  • Ages 15-24: 8.1% (1,385 residents)
  • Ages 25-44: 32.5% (5,567 residents)
  • Ages 45-64: 22.4% (3,846 residents)
  • Over 65: 19.6% (3,351 residents)

What is the racial and ethnic makeup of Killingly?

The racial and ethnic makeup of Killingly is as follows:
  • White: 86.2% (14,771 residents)
  • Black or African American: 2.8% (483 residents)
  • American Indian and Alaska Native: 0.4% (60 residents)
  • Asian: 0.8% (135 residents)
  • Native Hawaiian and Other Pacific Islander: 0.1% (13 residents)
  • Two or More Races: 7.2% (1,235 residents)
  • Other: 2.6% (440 residents)

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

U.S.-born citizens represent 94.3% of the population in Killingly.

How many housing units are there in Killingly?

There are 7,350 housing units in Killingly, reflecting a -1.4% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

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

Killingly has a total of 6,990 households, with an average of 2 people in each.

What is the median household income in Killingly?

Killingly has a median household income of $88,200, representing a +9.5% shift from the previous year, according to the U.S. Census Bureau.

What is the job market overview for Killingly?

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

Job types:
  • White-collar workers: 75.5% (6,333 residents)
  • Blue-collar workers: 24.5% (2,060 residents)

Places of employment:
  • Self-employed: 5.1% (425 residents)
  • Private companies: 69.2% (5,807 residents)
  • Governmental workers: 16.8% (1,409 residents)
  • Not-for-profit companies: 9% (752 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