| # | Company | Employees |
|---|---|---|
| 1 |
University of California, Riversideucr.edu
Educates students, conducts research, and promotes social mobility. It is recognized for educational access and research excellence, with a focus on serving diverse communities. |
10,851 |
| 2 |
County of Riversiderc-hr.com
Seeking passionate individuals committed to solving critical issues in Riverside County, California, spanning diverse landscapes and borders with neighboring counties |
6,718 |
| 3 |
California Baptist Universitycalbaptist.edu
A university offering a wide range of undergraduate and graduate programs with Christian faculty, multiple accreditations, and a strong engineering department |
3,111 |
| 4 |
RIVERSIDE UNIFIED SCHOOL DISTRICTriversideunified.org
A medical practice company located in Riverside, California, providing services to the community within the Riverside Unified School District |
2,338 |
| 5 |
Riverside Community Hospitalgeo-blocked-site.azurewebsites.net
Provides comprehensive healthcare services, including surgery, neuroscience, cardiology, and orthopedics, with a focus on teaching and continuous medical innovation since 1901. |
1,705 |
| 6 |
Riverside City Collegercc.edu
Comprehensive liberal arts and sciences programs for degree, certificate, or transfer to 4-year college 19,000+ students per semester Link: bitly/Riverside-CC |
1,620 |
| 7 |
Farmer Boysfarmerboys.com
farm-to-table fast casual restaurant chain offering award-winning burgers, all-day breakfast, sandwiches, salads, and signature hand-breaded sides in multiple states |
1,360 |
| 8 |
Riverside County Office of Educationrcoe.us
Dedicated team supports local schools and student programs to ensure success of all students through service, support, and partnerships |
1,331 |
| 9 |
Riverside County Sheriff's Officeriversidesheriff.org
Law enforcement professionals in Riverside County, California, cover 7,300 square miles, serving communities with integrity, professionalism, leadership, and loyalty |
1,091 |
| 10 |
St. Mary Schoolstmaryriverside.org
Providing a Christ-centered academic environment rooted in the Catholic tradition for the children of St Mary School to build a strong foundation |
990 |
| 11 |
Airforce Baseairforce.com
Explore United States Air Force bases worldwide using the interactive Base Locator tool provided by the company |
896 |
| 12 |
Riverside Community College Districtlinktr.ee
A provider of diverse educational programs since 1916, offering associate's degrees, career certificates, and transfer options to four-year institutions |
882 |
| 13 |
La Sierra Universitylasierra.edu
A diverse community rooted in Christian values, La Sierra University values inquiry, learning, service, and making a positive impact locally and globally |
833 |
| 14 |
Riverside County Department of Public Social Servicesrivcodpss.org
The Riverside County Department of Public Social Services provides assistance and support to vulnerable individuals and families in need through various programs and services |
741 |
| 15 |
K&N Engineeringknfilters.com
Global leader in manufacturing washable performance air filters and intake systems for cars, trucks, motorcycles, and industrial applications with worldwide distribution and innovative technology |
673 |
| 16 |
Riverside Medical Clinicriversidemedicalclinic.com
Providing comprehensive multi-specialty medical services in Riverside region, focusing on qualitatively excellent, accessible, and affordable healthcare for individuals, businesses, and industries |
652 |
| 17 |
Premium Waters Inc.premiumwaters.com
A supplier of bottled water, coffee services, and water solutions, offering home and office delivery with a focus on trust and quality products |
635 |
| 18 |
Cogentcogentcompanies.com
Twelve partner companies providing fluid pumping and water processing solutions for industrial, municipal, commercial building trades, and oil and gas market sectors. |
578 |
| 19 |
Best Best & Krieger LLP (BBK)bbklaw.com
A trusted partner providing innovative legal solutions and cost-effective representation nationwide in areas such as municipal, environmental, employment, and government relations |
555 |
| 20 |
Riverside County District Attorney's Officerivcoda.org
The Riverside County DA's Office represents the people of California in criminal matters, with over 700 attorneys serving 22 million residents They file 50,000+ cases annually |
503 |
| 21 |
Velocitivelociti.com
Comprehensive technology solutions company specializing in designing, deploying, and maintaining customized technology systems for global business needs. |
475 |
| 22 |
PCI Gasespcigases.com
Manufacturer of ruggedized onsite oxygen and nitrogen generators for various markets, enabling customers to produce gas at point of use for efficiency and cost savings |
474 |
| 23 |
Cincom Systemscincom.com
Provides enterprise software solutions to streamline operations, improve customer engagement, and support scalable application development for businesses worldwide. |
463 |
| 24 |
Eagle Strategieseaglestrategies.com
A financial services company in Riverside, California, providing personalized strategies and solutions to help clients achieve their financial goals |
454 |
| 25 |
Riverside Casino & Golf Resort庐riversidecasinoandresort.com
Offering a luxurious hotel and casino experience, with magnificent fountains and top-notch amenities designed for guests' total enjoyment |
430 |
| 26 |
Luxfer Gas Cylindersluxfercylinders.com
Manufacturer of light, durable, corrosion-resistant aluminum and composite cylinders for high-pressure gas storage across diverse global markets. |
389 |
| 27 |
Moss Bros Auto Grouplinktr.ee
A multi-generational automotive legacy that operates a network of dealerships, providing elite-level service and striving to exceed customer expectations |
331 |
| 28 |
Parkview Community Hospital Medical Center, Inc.ahmchealth.com
A non-profit healthcare provider with over 60 years of experience, offering quality and compassionate care to all ages in Riverside and surrounding communities |
328 |
| 29 |
UC Riverside School of Medicinemedschool.ucr.edu
A medical school focused on increasing physician diversity in Inland Southern California, improving healthcare for underserved populations, and conducting research |
317 |
| 30 |
Polymer Logisticstoscaltd.com
A global leader in reusable packaging solutions for food supply chains, offering end-to-end pooling capabilities to reduce costs and improve supply chain performance |
305 |
| 31 |
Altura Credit Unionalturacu.com
Tailored financial products and services for individuals at all stages of life, while actively giving back to the community Serving multiple counties |
292 |
| 32 |
HeadSpinheadspin.io
Its data science platform identifies and resolves user experience issues, enhancing app performance and boosting user engagement for businesses. |
223 |
| 33 |
Sierra Aluminumsierraaluminum.com
A manufacturer of standard and custom aluminum extrusions in Southern California, with capabilities ranging from billet casting to fabrication and architectural services |
199 |
| 34 |
Fidelis Securityfidelissecurity.com
Provides proactive cyber defense, safeguarding modern IT for global enterprises with XDR and CNAPP platforms. Consolidates IT security operations, shrinks attack surfaces, and automates threat detection. |
199 |
| 35 |
Baker's Drive Thrubakersdrivethru.com
Founded in 1952 in San Bernardino, California, this company offers top-quality, affordable hamburgers, tacos, burritos, and vegetarian menu items at 39 locations |
186 |
| 36 |
Southeastern California Conference of Seventh-day Adventistsseccadventist.org
Administrative headquarters in Riverside, CA for numerous churches, schools, and companies in Southern California, serving over 70,000 members |
184 |
| 37 |
Riverside University Health System - Behavioral Healthruhealth.org
Providing wellness, behavioral health, and prevention programs to residents in Riverside County to improve overall quality of life |
182 |
| 38 |
Albert A. Webb Associates (WEBB)webbassociates.com
A long-standing firm with expertise in infrastructure systems, planning, and land development, making a major impact throughout the region |
179 |
| 39 |
Riverside Transit Agencyriversidetransit.com
Coordination of regional and local bus transit services, driver training, grant assistance, and development of transit plans in Riverside County. |
178 |
| 40 |
Complete Coach Workscompletecoach.com
Industry-leading bus remanufacturing company offering clean, innovative transportation solutions through alternative fuel technology, sales, leasing, and exceptional customer service |
173 |
| 41 |
Herman Weissker, Inc.hermanweissker.com
Provider of full-service engineering, construction, maintenance, planning & design services for utility construction projects in the western United States with a focus on safety and quality |
168 |
| 42 |
Riverside County Flood Control and Water Conservation Districtrcflood.org
The company is dedicated to protecting people, property, and watersheds from flood damage, while also conserving and reclaiming water for beneficial use |
165 |
| 43 |
Sandals Churchrecruiting2.ultipro.com
Sandals Church empowers staff to embrace authenticity and mobilize believers to serve, creating a vibrant community centered around faith |
164 |
| 44 |
TKE Engineering, Inc.tkeengineering.com
A premier multi-disciplinary engineering and construction consulting firm in Southern California, dedicated to community needs with focus on quality, efficiency, and value creation |
164 |
| 45 |
ENC - ElDorado National California Inc.eldorado-ca.com
Manufacturer of low floor and standard floor buses for public transit, airport, parking, and university markets, offering customizable designs and advanced safety standards |
163 |
| 46 |
UCR Extensionextension.ucr.edu
This organization provides continuing education and professional studies for individuals of all ages, helping them advance their careers or pursue personal growth |
163 |
| 47 |
Tilden-Coil Constructorstilden-coil.com
A general contractor in Southern California specializing in educational, institutional, commercial, and industrial construction, with a focus on career development and diversity |
160 |
| 48 |
Mad River Local Schoolsmadriverschools.org
The public school district in Riverside, OH offers state-of-the-art education to over 3,800 students, focusing on individual development and excellence |
160 |
| 49 |
The Press-Enterprisepe.com
A daily newspaper and website serving Inland Southern California, offering diverse media content and advertising services across Southern California |
159 |
| 50 |
Argosy Casino Hotel & Spa Riversideargosykansascity.com
Full-service Las Vegas-style casino resort with gaming, dining, and luxury accommodations, located just north of Kansas City, MO |
159 |
| 51 |
Fusion Sign and Designfusionsign.com
Specializing in expert quality signage, traffic solutions, banners, and trade show solutions nationwide, offering custom sign solutions for various industries UL & OSHA certified |
149 |
| 52 |
Hal Hays Construction, Inc.halhays.com
A leading construction company specializing in federal, military, and government projects, with a focus on safety, quality, and integrity since 1991 |
148 |
| 53 |
The Grove Community Churchthegrove.cc
A community church focused on reaching all people, united on essential doctrines, respectful of diverse views, and aligned with two Christian organizations |
146 |
| 54 |
PartnerOnepartnerone.com
An enterprise software company specializing in managing large data environments through virtualized cloud storage, automation, AI, and metadata analytics for critical needs |
107 |
| 55 |
Exclusive Realtyexclusiverealtyonline.com
A full-service real estate company in the greater Riverside area, offering excellent service to clients looking to buy or sell property |
70 |
| 56 |
Stromasysstromasys.com
Specializes in providing emulation software to virtualize legacy systems on modern hardware or in the cloud, enabling organizations to continue operating existing software seamlessly and efficiently |
61 |
| 57 |
Blacoh Industriesblacoh.com
Industry leader in fluid control solutions since 1976, specializing in pulsation dampeners, back pressure valves, surge protection, and spill containment systems for various applications worldwide |
41 |
| 58 |
Arcade Coffee Roastersarcadecoffeeroasters.com
A company dedicated to creating meaningful connections through shared moments, relationships, and fostering a sense of belonging for all |
25 |
| 59 |
DCH ROASTERS, INC.bio.site
A family-owned coffee roasting company based in Inland Empire, Southern California, specializing in premium coffee beans and products |
20 |
| 60 |
Raincross Group Inc
Plastics design and manufacturing firm offering global reach in product launches, tooling procurement, and management services in various industries |
11 |
| 61 |
Smart Energy USA
Innovating solar energy solutions to transition electric utilities into green energy companies, meeting the increasing demand for eco-friendly alternatives worldwide |
11 |
| 62 |
Karen Allen Salon & Spakarenallensalon.com
A salon and day spa focused on celebrating inner and outer beauty, wellness, and diversity, offering a variety of services using Aveda products |
10 |
| 63 |
Lucid Glass Studiolucidglassstudio.com
Creating unique decorative and architectural glass products using traditional techniques and modern technology for residential and commercial spaces in the US |
6 |
| 64 |
Federation of World Citizensfwc.ngo
The company provides various financial services to its clients, assisting with managing investments, wealth, insurance, and other related financial matters |
6 |
| 65 |
Hohertz Technologies, LLChohertz.com
The company invests in and advises early-stage startups to help them grow and succeed in their ventures |
3 |
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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