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Population and Demography of Connecticut
Connecticut is the southernmost state of the United States. It is bordered by Rhode Island to the east, Massachusetts to the north, New York to the west, and the Long Island Sound to the south.
Connecticut is the 29th most populous state in the United States and the third-smallest U.S. state by area. The total Land area is 4,849 sq. mi. (12,559 sq. km) and there is an average of 739 people for every square mile. This makes Connecticut the 4th most densely populated state in the US. As per the United States Census Bureau, the population of Connecticut in 2020 was 3,605,944 (3.6 million)
Estimated Population of Connecticut in 2024: 3,617,176 or 3.6 million
Connecticut Population (2010-2020)
Connecticut has a population growth rate of 0.9% during 2010-2020. It has population increase of 31,847 since 2010. The median age in Connecticut is 40.6 years and carries a small gender gap of 51.2% female and 48.8% male individuals in the total state population.
| Connecticut | Census 2020 |
| Total Population | 3,605,944 (3.6 million) |
| Percentage Change | 0.9% |
| Population Rank | 29th |
| Total Land Area | 4,849 sq mi (12,559 sq. km) |
| Area Rank | 48th |
| Population Density | 739/sq mi (285/km2) |
| Capital City | Hartford |
| Largest City | Bridgeport |
Source: US Census 2020
Connecticut Historical Population
Connecticut has a population growth rate of 6.1% during 2010-2020. In the year 1900 Connecticut’s Population was 1 million and in 2020 it reached 3.6 million, an increase of almost 2.6 million.
Let’s look at decade population & percentage change
| Census Year | Population | % Change |
| 1790 | 237,946 | — |
| 1800 | 251,002 | 5.50% |
| 1810 | 261,942 | 4.40% |
| 1820 | 275,248 | 5.10% |
| 1830 | 297,675 | 8.10% |
| 1840 | 309,978 | 4.10% |
| 1850 | 370,792 | 19.60% |
| 1860 | 460,147 | 24.10% |
| 1870 | 537,454 | 16.80% |
| 1880 | 622,700 | 15.90% |
| 1890 | 746,258 | 19.80% |
| 1900 | 908,420 | 21.70% |
| 1910 | 1,114,756 | 22.70% |
| 1920 | 1,380,631 | 23.90% |
| 1930 | 1,606,903 | 16.40% |
| 1940 | 1,709,242 | 6.40% |
| 1950 | 2,007,280 | 17.40% |
| 1960 | 2,535,234 | 26.30% |
| 1970 | 3,031,709 | 19.60% |
| 1980 | 3,107,576 | 2.50% |
| 1990 | 3,287,116 | 5.80% |
| 2000 | 3,405,565 | 3.60% |
| 2010 | 3,574,097 | 4.90% |
| 2020 | 3,605,944 | 0.90% |
Source: US Census 2020
Religion in Affiliations
Christianity is the majority religion in Connecticut followed by 70% of the population. The largest Christian denomination in Connecticut is Protestants (35%); Roman Catholics (33%); Mormonism (1%); Eastern Orthodoxy (1%)
Next comes the Unaffiliated population, 23% of the population doesn’t follow or adhere to any faith or religion. Other non-Christian-based religions and faiths are followed by 7% of the population and include Jewish (3%), Hinduism (1%), Buddhist (1%), Muslims (1%) and smaller other faiths.
For more details read Religion in Connecticut
Race and Ethnicity
In 2020, the White alone (non-Hispanic) population was the largest racial or ethnic group in Connecticut, comprising 63.21% of the total population. It was followed by the Hispanic or Latino population whose share was 17.29%. Black or African American was the third largest group at 10.01%. The Asian population was fourth with a share of 4.73%.
Ancestry in Connecticut
As per Census Studies & estimate Italian, Irish, German, English, and Polish have made the five largest ancestry groups in Connecticut.
For more Details read Race and Ethnicity in Connecticut
Top cities and counties in Connecticut
As of 2022, Connecticut is divided into 8 counties. The largest county in the state by population is Fairfield, with a population of 949,921. The largest city in Connecticut is Bridgeport, with a population of 143,525 followed by Stamford (131,397) and New Haven(130,801).
read more about counties and cities in Connecticut
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