Datacircle

List of companies in Connecticut: 48,766, by city, industry and size

48,766 companies with a LinkedIn page give their headquarters in Connecticut, in our October 2026 release, 39,190 of them with a website. Construction is the largest industry, with 2,295.

14,005 of them, companies of 11 to 500 employees, are in Datacircle's free 10M+ U.S. dataset, and so are 94,512 people in Connecticut: 29,602 with an email, 42,527 with a mobile phone. One download, free with a work email. Below, Connecticut's companies by city, industry and size, and 20 of the free file's, picked at random.

Download them

Sign up with your work email: the 10M+ U.S. dataset is on your dashboard, one zip with the companies and the people. Keep Connecticut's:

import duckdb
duckdb.sql("""
  select NAME, URL, HQ_STREET, HQ_CITY, LINKEDIN_INDUSTRY, EMPLOYEE_COUNT_RANGE
  from 'us_smb_mid_market_companies.parquet'
  where HQ_STATE_CODE = 'CT'
""").write_csv("ct_companies.csv")

The people: where STATE_CODE = 'CT' in us_smb_mid_market_persons.parquet. Every column of the companies file: the free list of US companies. The people's: the free US B2B leads dataset.

Companies in Connecticut by city

The ten cities with the most headquarters, all sizes, as LinkedIn gives them (a suburb is its own city).

Companies headquartered in Connecticut by city, October 2026
CityCompaniesShare
Stamford3,0316.2%
New Haven2,3164.7%
Hartford2,0984.3%
Norwalk1,7063.5%
Westport1,3002.7%
Fairfield1,1702.4%
Bridgeport1,1572.4%
Danbury1,1392.3%
West Hartford9952.0%
Milford9131.9%

Companies in Connecticut by industry

The ten largest LinkedIn industries in Connecticut, all sizes, and how many of each the free file holds.

Companies headquartered in Connecticut by LinkedIn industry, October 2026
IndustryAll sizesIn the free file
Construction2,295952
Medical Practices2,124513
Hospitals and Health Care1,615532
Restaurants1,444863
Real Estate1,197365
Financial Services1,162364
Individual and Family Services1,159312
Retail1,135499
Advertising Services981288
Business Consulting and Services945179

Companies in Connecticut by size

By the employee range on their LinkedIn page. The free file holds the companies of 11 to 500 employees; every size, in the 50M+ dataset, unlocks once 3 people you invited sign up.

Companies headquartered in Connecticut by employee range, October 2026
EmployeesCompaniesShare
117,63336.2%
2-1012,98326.6%
11-5012,99426.6%
51-2003,4687.1%
201-5008741.8%
501-1,0003320.7%
1,001-5,0003070.6%
5,001-10,000660.1%
10,001+1090.2%

20 companies in Connecticut, picked at random

Rows of the free file with a website of their own, picked at random, as the file holds them.

20 companies in Connecticut of the free file
CompanyCityIndustryEmployeesWebsite
Worldtek Travel & Event ManagementSheltonEvents Services51-200worldtek.com
Valpaks Engineering LLCCheshireAviation and Aerospace Component Manufacturing11-50valpaks.com
Loehmann-Blasius Chevrolet, IncWaterburyRetail51-200blasiuschevycadillac.com
Tokyo Sushi Restaurant & BarNorwichRestaurants11-50tokyosushirestaurantbar.com
Doosan CorporationBristolMachinery Manufacturing11-50doosan.com
Louth CallanEnfieldConstruction51-200louthcallan.com
Advanced Behavioral CareWoodbridgeMental Health Care11-50advancedbehavioral.com
Rj Cafe And BistroMadisonRestaurants11-50rjcafebistro.com
Peking Tokyo MonroeMonroeFood and Beverage Services11-50pekingtokyomonroe.kwickmenu.com
Danielson Pharmacy IncDanielsonCosmetics11-50danielsonpharmacy.com
Yankee OilMansfield CenterOil and Gas11-50yankeeoil.com
Specialty Lighting GroupCenterbrookWholesale Building Materials11-50sslighting.com
Tristate Waterproofing & Home ImprovementBridgeportConstruction11-50tristatewaterandhome.com
Elite Construction Resources LLCWallingfordConstruction11-50elitecr.com
Q30 InnovationsNorwalkMedical Equipment Manufacturing11-50q30.com
Northfield Excess & Surplus LinesHartfordInsurance201-500northfieldins.com
J & S Radio SalesHamptonRetail11-50jandsradio.com
Nutmeg Exhibit Co., IncWindsorEvents Services11-50nutmegexhibit.com
Family Dental Practice Of Newington, LLCNewingtonMedical Practices11-50familydentalnewington.com
Advanced Foot Care PcStamfordMedical Practices11-50advancedfootcarepc.com

Other states

Questions

How many companies are there in Connecticut?

48,766 companies with a LinkedIn page give their headquarters in Connecticut, in our October 2026 release of 6,700,867 US companies. 17,336 of them have 11 to 500 employees. A company without a LinkedIn page isn't counted.

Which city in Connecticut has the most companies?

Stamford, with 3,031 (6.2% of the state's), then New Haven with 2,316.

Can I download a free list of companies in Connecticut?

Yes: 14,005 of them, companies of 11 to 500 employees, are in Datacircle's free 10M+ US dataset, with website, headquarters address, industry, size and founding year. Sign up with a work email, download it, and keep the rows whose HQ_STATE_CODE is 'CT'.

Does it include contacts in Connecticut?

Yes: the people file in the same download holds 94,512 people whose LinkedIn profile is in Connecticut, 29,602 with an email and 42,527 with a US mobile phone.

Sign up with your work email: your API key and a $5 credit that never expires are on your dashboard, with the free 10M+ U.S. B2B leads dataset.

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