The smallest Connecticut county in terms of economic output had the state's largest GDP growth in percentage terms last year.

Windham County’s gross domestic product grew 2.6% in 2019, the highest among Connecticut’s eight counties, according to the U.S. Bureau of Economic Analysis.

201720182019201720182019
Connecticut$248.1B$249B$251B0.9%0.4%0.9%
Fairfield$79B$79.3B$79.8B-0.3%0.3%0.7%
Hartford$79B$79.5B$79.9B1.4%0.2%0.6%
Litchfield$7.5B$7.4B$7.6B-0.1%-1.1%2.1%
Middlesex$8.8B$8.5B$8.7B1.2%-2.6%1.6%
New Haven$46.7B$47.7B$48.4B0.7%2.1%1.5%
New London$17.3B$17.2$17.3B4.5%-0.4%0.7%
Tolland$4.9B$4.8B$4.9B4.3%-1.9%0.4%
Windham$4.5B$4.6B$4.7B-1.9%1.1%2.6%
2017-2019 GDP by county in dollar terms and percentage change. Source: U.S. Bureau of Economic Analysis.

Next highest was Litchfield County, which grew 2.1%, followed by Middlesex (1.6%) and New Haven (1.5%) counties.

At $4.68 billion, Windham County has the smallest GDP among Connecticut counties in 2019.

Litchfield County’s 2.1% GDP growth pushed its economy to $7.6 billion in 2019.

Hartford and Fairfield counties have the largest economies, each with a 2019 GDP of around $79 billion.

But neither county had appreciable growth in 2019 as Fairfield’s GDP grew by just 0.7% while Hartford’s increased by 0.6%.

New London County’s year-over-year growth was 0.7% while Tolland County has the smallest increase at 0.4%.

State GDP

The state’s overall GDP growth was 0.9%, from roughly $249 billion in 2018 to $251 billion in 2019.

That placed Connecticut near the bottom of the New England states.

Only Vermont at 0.8% had slower growth than Connecticut.

Connecticut's overall GDP growth was 0.9%, from roughly $249 billion in 2018 to $251 billion in 2019.

Maine led New England states with a 2.6% increase in its GDP, followed by Massachusetts (2.4%), New Hampshire (1.4%), and Rhode Island (1%).

Nationwide, New Mexico had the largest growth at 5.2% followed by Washington (4.6%), Colorado (3.9%), Utah (3.8%), and California and Idaho (3.4% each).

As a whole, the country’s GDP grew 2.2% in 2019, down from 3% growth in 2018.