Collinsville, Connecticut Demographics & Population 2026
During the 2020–2024 ACS period, Collinsville, Connecticut had a total population of 3,963, the 78th largest community in Connecticut, with a median household income of $94,815, which is 1% lower than the state average. The poverty rate is 7.7%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Collinsville Quick Facts
How Collinsville Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 4,001 | 3,963 | -0.9% |
| Median household income | $104,808 | $94,815 | -9.5% |
| Median home value | $376,800 | $395,500 | +5.0% |
How Collinsville Compares
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
A less diverse community where one racial or ethnic group represents a large majority.
State average: 57 | National average: 61
Education
Educational Attainment (Adults 25+)
Collinsville Rankings in Connecticut
Explore Connecticut Rankings
Cities Similar to Collinsville
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Watertown | 3,897 | $103,200 | $293,300 | 45.4% | 13.2% |
| Quinnipiac University | 4,311 | N/A | N/A | 100.0% | N/A |
| Broad Brook | 3,609 | $97,625 | $347,400 | 46.5% | 9.9% |
| Lordship | 3,669 | $84,606 | $465,200 | 47.3% | 8.6% |
| Long Hill (Southeastern Connecticut County) | 4,399 | $84,201 | $175,600 | 47.9% | 16.1% |
Population Overview
Collinsville is a small community located in Connecticut. The total population is 3,963. It ranks as the 78th most populous out of 214 Census-designated places in Connecticut.
Age Demographics
The median age in Collinsville is 49.4 years. This is 20% higher than the state median of 41.1 years. 13.6% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.
Economy, Income & Housing
The median household income in Collinsville is $94,815. This is 1% lower than the state median of $95,781. It is also 17% higher than the national median of $80,734. The poverty rate stands at 7.7%. This is 24% lower than the state poverty rate of 10.0%. The unemployment rate is 4.8%. This is 15% lower than the state rate of 5.6%. The median home value is $395,500. Housing costs are 8% higher than the state median of $366,900. The home-value-to-income ratio is 4.2x. 70.7% of occupied housing units are owner-occupied. This homeownership rate is 6% higher than the state average of 66.5%.
Race & Ethnicity
The largest racial or ethnic group in Collinsville is White (non-Hispanic), making up 84.7% of the population. Asian residents account for 5.2%. The Black or African American population (1.8%) is well below the state average of 9.8%. The Hispanic or Latino population (1.4%) is well below the state average of 18.3%.
Education
57.0% of residents aged 25 and older hold a bachelor's degree or higher. This is 34% higher than the state rate of 42.5%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 97.5%. Notably, 29.2% of adults hold a graduate or professional degree, indicating a highly educated workforce.
Data Sources & Methodology
All demographic data for Collinsville, Connecticut is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Connecticut state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 214 Census-designated places in Connecticut. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.
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Frequently Asked Questions
What is the population of Collinsville, Connecticut?
Collinsville, Connecticut has a population of 3,963 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Collinsville, CT?
The median household income in Collinsville is $94,815, which is 17% higher than the national median of $80,734.
What is the poverty rate in Collinsville, CT?
The poverty rate in Collinsville is 7.7%. This means approximately 295 residents live below the federal poverty line.
What is the racial makeup of Collinsville, Connecticut?
Collinsville's population is 84.7% White, 1.8% Black, 1.4% Hispanic/Latino, and 5.2% Asian.
What is the median home value in Collinsville, CT?
The median home value in Collinsville is $395,500. The home-value-to-income ratio is 4.2x.
How educated is Collinsville, Connecticut?
57.0% of adults (25+) in Collinsville hold a bachelor's degree or higher, and 29.2% hold a graduate or professional degree.