| # | Company | Employees |
|---|---|---|
| 1 |
Boost Mobiledish.com
A nationwide wireless provider offering affordable, reliable service to diverse communities, constantly improving their network to deliver value to customers |
6,382 |
| 2 |
SSSeecentral.com
Innovative HRMS software developer providing integrated solutions like payroll, HR, hiring, and time tracking for various industries to improve operational efficiency |
2,086 |
| 3 |
Littleton Public Schoolslittletonpublicschools.net
A top-ranking school district in the Denver metro area, providing comprehensive education from preschool to Grade 12 with a focus on 21st-century learning and safety |
1,554 |
| 4 |
Arapahoe Countyarapahoeco.gov
Arapahoe County in Colorado serves a population of over 618,000 through its government offices, services, and administrative functions in various locations |
1,365 |
| 5 |
Arapahoe Community Collegearapahoe.edu
Arapahoe Community College offers quality education and economic opportunities in an inclusive environment, supporting students, employees, and the community towards success |
1,109 |
| 6 |
Five Rings Financial, LLCfiveringsfinancial.com
Provides financial education and safe money strategies for middle-class families focusing on tax-free retirement, living benefits, and wealth protection against inflation and taxes. |
564 |
| 7 |
South Suburban Park and Recreation Districtssprd.org
The organization maintains parks, trails, recreation centers, golf courses, pools, ice centers, and more, offering diverse job opportunities and employee perks |
538 |
| 8 |
LONG Building Technologieslong.com
A company specializing in building performance through innovative solutions and collaboration, offering HVAC equipment, building automation, security solutions, HVAC service, and parts |
506 |
| 9 |
The Middlesex Corporationmiddlesexco.com
A leader in heavy civil construction and paving industries, prioritizing safety, quality, and excellence since 1972 Committed to growth and success |
480 |
| 10 |
Dover Saddlerydoversaddlery.com
Premier brand in English riding industry offering high-quality horse tack, riding apparel, and stable items, with exceptional customer service nationwide |
426 |
| 11 |
MFCP - Motion & Flow Control Products, Inc.mfcp.com
Distributor of fluid power and process control products providing hydraulic system engineering, design, manufacturing, component repairs, troubleshooting, and industrial filtration across many locations. |
414 |
| 12 |
Behavior Analyst Certification Board (BACB)linktr.ee
A nonprofit organization established in 1998 to meet professional credentialing needs for behavior analysts, governments, and consumers of behavior analysis services |
410 |
| 13 |
Workers Credit Unionwcu.com
A leading credit union in Massachusetts offering full banking services, innovative financial solutions, investment advisory services, and insurance products |
380 |
| 14 |
City of Littletonlittletonco.gov
Governs a Colorado community featuring diverse residential neighborhoods, high technology businesses, public schools, parks, trails, and cultural events for nearly 45,000 residents. |
333 |
| 15 |
Bricks & Minifigsbricksandminifigs.com
The company specializes in providing a wide range of LEGO products to help customers build their dreams one brick at a time |
331 |
| 16 |
Littleton Regional Healthcarelittletonhealthcare.org
Non-profit Critical Access Hospital in New Hampshire's White Mountains, offering primary and specialty healthcare to the North Country of New Hampshire and Northeast Kingdom of Vermont |
264 |
| 17 | 253 | |
| 18 |
South Denver Cardiology Associatessouthdenver.com
A comprehensive cardiac care center offering personalized plans focusing on exercise, nutrition, stress reduction, medication, and diagnostic tests for optimal wellness |
202 |
| 19 |
Payroll Vaultpayrollvault.com
A leading payroll vendor re-defining the industry with advanced technology, quality service, and impeccable customer support, offering franchise opportunities nationwide |
172 |
| 20 |
Reclaim: Dignity + Hope + Lifereclaimwithus.org
A global network of professionals in Colorado working in 12+ countries to achieve holistic, sustainable development and restore hope Led by Gabrielle Thompson |
170 |
| 21 |
Blake and Associates Real Estate Appraisal Companyblakeandassoc.com
Real estate company located in Richmond, Kentucky, offering professional services for property transactions, investments, and management in the United States |
164 |
| 22 |
Greiner Electricgreinerelectric.com
Full-service electrical contractor in Colorado and Wyoming specializing in large-scale commercial projects, offering design, budgeting, and 24/7 emergency services |
162 |
| 23 |
American Exteriors LLCamext.com
A manufacturer of replacement windows and siding, offering products to enhance energy efficiency and appearance of homes since 1983 |
159 |
| 24 |
ExoTerra Resource LLCexoterra.com
Develops electric propulsion systems, solar electric propulsion modules, and buses for miniaturized satellites, focusing on power and electric propulsion solutions. |
153 |
| 25 |
FIBA Technologies, Inc.fibatech.com
Manufacturer of gas containment equipment, including seamless pressure vessels and cryogenic equipment for high pressure gas storage and transport in various industries |
152 |
| 26 |
Frenchies Modern Nail Carefrenchiesnails.com
Innovative nail studio franchise offering clean-care services, excellent customer service, and moderate pricing across 20 states in the US Visit website for franchise opportunities |
150 |
| 27 |
Littleton Coin Companylittletoncoin.com
Established in 1945, this company is a top provider of coins, paper money, and collecting supplies with a focus on friendly service for collectors worldwide |
148 |
| 28 |
Broadnetbroadnet.com
Innovative engagement solutions prioritize security and customer service, enabling meaningful connections while protecting sensitive information and promoting compliant communication |
147 |
| 29 |
PassTimepasstimegps.com
A global transportation industry leader offering wireless GPS telematics products for automotive sectors, with patented technology and 24/7 live customer support |
103 |
| 30 |
La Nacional Corplanacional.com
A company with 30 years of experience in money transfers, offering financial services in 13 states and 85 countries through a large network of points and agents |
76 |
| 31 |
Optometricsoptometrics.com
Specializing in optical components for defense, security, research, academia, and OEM customers globally with a focus on high quality, cost competitive products and services |
45 |
| 32 |
Productivity Incproductivity.com
Provider of machine tools, tooling, robots, and related equipment for manufacturing in multiple states, offering innovative solutions and superior results for metalworking needs |
34 |
| 33 |
RapidFunnel Inc.rapidfunnel.com
It provides a unique app for network marketing, enhancing prospecting, recruiting, and real-time analytics to support distributors and their success. |
30 |
| 34 |
Autosaver Groupautosavergroup.com
A group of 13 locally owned dealerships offering new and pre-owned vehicles from 13 different franchises, with complimentary delivery in New England and NY |
29 |
| 35 |
Secured Network Services, Inc. - a Thrive Companythrivenextgen.com
A multi-service IT company providing mission-critical solutions and strategic initiatives, offering live help-desk support, cybersecurity, digital transformation, and customized IT support plans |
22 |
| 36 |
Mojo Selling Solutions, LLCmojosells.com
It provides lead generation technologies and telecom-driven prospecting systems for real estate and sales agents across North America. |
12 |
| 37 |
Traction Financial Partnerstractionfp.us
A leading financial services company providing customized guidance and strategies, with a focus on innovative and practical financial solutions for clients |
11 |
| 38 |  |
6 |
| 39 |
HARTECH GROUP LLChartechgroup.com
A machinery company based in Colorado, specializing in various industrial equipment and services for a range of industries |
5 |
| 40 |
12 Penny Exteriors, Inc.12penny.com
Local remodeling company specializing in window/door replacements, siding, decks, and interior transformations Fully licensed and insured, offering free estimates |
2 |
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Oct 24, 2026.
The same list elsewhere in United States
- The largest companies in the United States 91,669
- The largest companies in California 12,813
- The largest companies in New York State 10,485
- The largest companies in Texas 8,086
- The largest companies in Florida 4,945
- The largest companies in Illinois 4,175
- The largest companies in Pennsylvania 3,110
- The largest companies in Massachusetts 3,093
- The largest companies in Georgia 2,632
- The largest companies in Ohio 2,618
- The largest companies in New Jersey 2,569
- The largest companies in Virginia 2,503
- The largest companies in Michigan 2,346
- The largest companies in North Carolina 2,174
- The largest companies in Alabama 1,806
- The largest companies in Washington State 1,785
- The largest companies in Colorado 1,774
- The largest companies in Minnesota 1,700
- The largest companies in Maryland 1,527
- The largest companies in Wisconsin 1,482
- The largest companies in New York 6,920
- The largest companies in San Francisco 2,030
- The largest companies in Houston 1,791
- The largest companies in Chicago 1,668