The 60 largest companies in Westminster (2026 list)

#	Company	Industry	Headquarters	Employees	Founded
1	Trimble Inc.trimble.com A technology company delivering solutions in positioning, modeling, and data analytics to improve productivity, quality, safety, and sustainability in various industries	Software Development	🇺🇸 Westminster	11,061	1978
2	Ball Corporation ball.com Global company specializing in aluminum packaging solutions for beverages, personal care, and household products with a focus on sustainability.	Packaging and Containers Manufacturing	🇺🇸 Westminster	10,972	1880
3	Carroll County Public Schools carrollk12.org A top-performing school system in Maryland with innovative education programs, high student achievement, and strong community involvement, preparing students for post-graduation paths	Education Administration Programs	🇺🇸 Westminster	2,838	1865
4	Vantor vantor.com Fuses satellite and sensor data to create a living digital Earth replica, powered by AI, delivering mission-critical insights for defense, intelligence, and commercial sectors.	Software Development	🇺🇸 Westminster	2,462	n/a
5	Camp Bow Wow campbowwow.com A pet care franchise offering doggy day care, boarding, grooming, training, and charitable services, known for Making Dogs Happy for 20+ years	Consumer Services	🇺🇸 Westminster	2,086	2000
6	Maxar Technologies vantor.com Provider of secure, precise geospatial insights using advanced satellite imagery and AI software to support global safety and disaster response.	Defense and Space Manufacturing	🇺🇸 Westminster	1,325	n/a
7	City of Westminster westminsterco.gov Develops sustainable and inclusive communities with safe neighborhoods and beautiful open space, fostering a thriving environment for residents to live in	Government Administration	🇺🇸 Westminster	1,144	n/a
8	McDaniel College mcdaniel.edu Four-year independent liberal arts college offering over 100 undergraduate and graduate programs with experiential learning and student-faculty collaboration.	Higher Education	🇺🇸 Westminster	1,069	1867
9	Carroll Hospital lifebridgehealth.org A community hospital turned medical center offering top-notch programs and services, such as Family Birthplace, surgical services, Imaging Center, and wellness center	Hospitals and Health Care	🇺🇸 Westminster	982	1961
10	Tri-State Generation and Transmission Association, Inc.tristate.coop A not-for-profit power supplier to electric cooperatives in the Western US, providing affordable, responsible-generated power to rural communities	Utilities	🇺🇸 Westminster	978	1952
11	KPA kpa.io A leading provider of safety management and workforce compliance solutions, offering software, consulting services, and training to help organizations minimize risk	Software Development	🇺🇸 Westminster	816	1986
12	Loenbro loenbro.com Loenbro provides a comprehensive single-source solution for industrial needs nationwide, offering expertise in construction, electrical, maintenance, and inspection services	Construction	🇺🇸 Westminster	803	2000
13	SketchUp sketchup.trimble.com Leading design software empowering creative professionals across architecture, interior design, and construction with 3D modeling, collaboration tools, and virtual reality capabilities	Software Development	🇺🇸 Westminster	753	2000
14	Walmart DC 7016 A retail company with locations all over the US, headquartered in Gordonsville, Virginia, specializing in various products for consumers	Retail	🇺🇸 Westminster	729	n/a
15	Carroll Community College carrollcc.edu Offers affordable credit and non-credit programs with small classes, accessible faculty, support services, and student activities for diverse learners.	Higher Education	🇺🇸 Westminster	598	1993
16	Westminster School District wsdk8.us Progressive school district educating 9,500 students in 17 schools across Westminster, Garden Grove, Huntington Beach, and Midway City, focusing on developing future leaders	Education Administration Programs	🇺🇸 Westminster	584	1872
17	USPS- United States Postal Service A government administration company based in California, specializing in postal services and mail delivery Located in Paso Robles and Westminster	Government Administration	🇺🇸 Westminster	552	n/a
18	Knorr Brake Company knorr-bremse.us Innovative leader supplying rail market customers in North America with braking systems, passenger door systems, and climate-control systems as part of global company	Truck Transportation	🇺🇸 Westminster	529	1973
19	Aubuchon Company aubuchon.company A family-owned hardware store chain offering high-quality home repair products, exceptional service, and a friendly neighborhood atmosphere in New England	Retail	🇺🇸 Westminster	492	1908
20	ReedGroup alight.com Absence management services & software for employers, offering expert support in tracking & managing leave claims to ensure healthy, productive employees	Insurance	🇺🇸 Westminster	472	n/a
21	Westminster Public Schools wps.org A school district in Westminster, CO, providing personalized education for 10,000 students through a Competency Based System focused on mastery	Education Administration Programs	🇺🇸 Westminster	467	n/a
22	GeoStabilization International®geostabilization.com Specializing in geohazard mitigation, our experienced team develops innovative solutions to protect people and infrastructure from dangers such as landslides and rockfalls	Construction	🇺🇸 Westminster	454	2002
23	United States Postal Service-USPS A government administration company headquartered in California, specializing in postal services and mail delivery throughout the United States	Government Administration	🇺🇸 Westminster	448	n/a
24	Highridge Medical highridgemedical.com Creates innovative solutions for spine care, covering motion preservation, minimally invasive procedures, bone healing, and core spine issues.	Medical Equipment Manufacturing	🇺🇸 Westminster	440	2024
25	Arc Thrift Stores arcthrift.com A non-profit organization supporting programs for individuals with developmental disabilities and their families	Retail	🇺🇸 Westminster	423	1968
26	Carroll County Government, MD carrollcountymd.gov Local government managing eight municipalities within a metropolitan area, providing governance and services to diverse communities and districts.	Government Administration	🇺🇸 Westminster	409	1837
27	Scrum Alliance scrumalliance.org A nonprofit organization promoting agile practices through certification, resources, and a community to enhance skills and transform the world of work	Non-profit Organizations	🇺🇸 Westminster	395	2001
28	Trimble Viewpoint trimble.com Trimble is a technology company providing solutions for measuring, building, growing, and moving goods to improve productivity, quality, safety, and sustainability in various industries	Software Development	🇺🇸 Westminster	392	n/a
29	MTech Mechanical mtechg.com A premier design-build mechanical contractor in Colorado, offering industry-leading mechanical systems and a wide range of career opportunities with excellent benefits	Construction	🇺🇸 Westminster	379	2002
30	Carrol County Public Schools carrollk12.org Providing rigorous curriculum and support, Carroll County Public Schools prepares students to thrive as responsible citizens in partnership with staff, families, and community members	Higher Education	🇺🇸 Westminster	370	n/a
31	Probation and Parole Office A law enforcement office providing probation and parole services located in Grenada, Mississippi and Westminster, California	Law Enforcement	🇺🇸 Westminster	323	n/a
32	PTx Trimble ptxtrimble.com Specializes in precision agriculture technology, offering hardware, software, and cloud platforms to help farmers optimize resources and improve food production sustainability	Farming	🇺🇸 Westminster	321	n/a
33	J & J Construction jandjconst.net Specializing in airport construction since 2001, this small business general contractor works nationwide on projects of all sizes, ensuring excellence and communication throughout	Construction	🇺🇸 Westminster	320	2001
34	Community Reach Center communityreachcenter.org A mental health center founded in 1957 in Colorado, providing care to 13,000 individuals annually in clinics, schools, and homes	Mental Health Care	🇺🇸 Westminster	309	1957
35	UNITED STATES AIRFORCE A medical practice company specializing in serving residents of Louisiana and California, operating out of multiple locations in the United States	Military and International Affairs	🇺🇸 Westminster	213	n/a
36	REP Fitness repfitness.com A family-owned fitness company focused on innovation, customer service, and value with rapid growth driven by a start-up mentality and passion	Wellness and Fitness Services	🇺🇸 Westminster	185	2012
37	Xclusive Staffing xclusivestaffing.com Specializes in providing temporary staffing for various sectors in the hospitality industry, including hotels, hospitals, stadiums, and offices, serving clients like Hyatt and Hilton	Hospitality	🇺🇸 Westminster	180	n/a
38	Probation Department A law enforcement agency based in Buffalo, New York, specializing in probation services, based out of Westminster, California	Law Enforcement	🇺🇸 Westminster	179	n/a
39	United States Citizenship & Immigration Services Government administration company based in Boise & Westminster, California, managing United States citizenship and immigration services for individuals and families	Government Administration	🇺🇸 Westminster	177	n/a
40	DigitalGlobe digitalglobe.com A leading provider of high-resolution world imagery products and services sourced from advanced satellites and aerial networks for various industries	IT Services and IT Consulting	🇺🇸 Westminster	175	1993
41	Adult Probation & Parole Law enforcement company specializing in adult probation and parole services, located in Beaver, Utah and Westminster, California, United States	Law Enforcement	🇺🇸 Westminster	174	n/a
42	Sonus Hearing Care Professionals sonushearing.com Dedicated to improving hearing care standards by offering personalized solutions through a Patient Centered Approach, tailoring each experience to individuals	Hospitals and Health Care	🇺🇸 Westminster	168	1992
43	ACH Foam Technologies Inc.achfoam.com Leading manufacturer of expanded polystyrene (EPS) products for construction, geotechnical, packaging, and OEM industries, meeting EPA regulations, LEED project components, and promoting recycling	Plastics	🇺🇸 Westminster	164	2005
44	Probation Officer Specialists work with offenders to prevent recidivism and ensure rehabilitation, promoting a safer society through intervention and monitoring	Law Enforcement	🇺🇸 Westminster	163	n/a
45	Embassy of the United States of America usembassy.gov Government administration company based in Lisbon, Portugal, representing the United States of America	Government Administration	🇺🇸 Westminster	153	n/a
46	HGS AxisPoint Health LLC A "whole person" care management services company using predictive analytics and passionate clinicians to improve physical health, reduce costs, and increase satisfaction	Hospitals and Health Care	🇺🇸 Westminster	152	n/a
47	Vector Force Development vectorforcedevelopment.com A Service-Disabled Veteran Owned Business providing construction support services to the energy industry and offering human capital solutions across various industries	Utility System Construction	🇺🇸 Westminster	151	2016
48	LAI International, LLC laico.com Highly-engineered precision component manufacturing solutions for top-tier customers in aerospace, defense, medical device, energy, and industrial industries	Aviation and Aerospace Component Manufacturing	🇺🇸 Westminster	89	1979
49	Townsend townsendretirement.com The company focuses on retirement planning and investment management, offering personalized client service, educational events, community involvement, and active portfolio management	Financial Services	🇺🇸 Westminster	86	1990
50	Ascent Geomatics Solutions ascentgeomatics.com Provides land surveying, remote sensing, GIS, civil engineering, permitting, and project management services to the energy industry, leveraging extensive experience with state-of-the-art technology.	Surveying and Mapping Services	🇺🇸 Westminster	65	2006
51	Ranor, Inc.ranor.com Leaders in precision components and equipment fabrication and machining, specializing in customized solutions for a variety of industries with a focus on quality and excellence	Machinery Manufacturing	🇺🇸 Westminster	65	1956
52	Advanced Thermal Batteries Inc. (ATB)asb-group.com Leading supplier of advanced thermal batteries for defense applications, offering a wide range of electrochemical options such as Li based and metal disulfide technologies	Defense and Space Manufacturing	🇺🇸 Westminster	41	n/a
53	Sun Engineering Services, Inc.sunengr.net Engineering consulting firm providing multi-discipline services for the energy industry, utilities, and petroleum transportation Award-winning company with extensive experience and diverse project portfolio	Oil and Gas	🇺🇸 Westminster	32	1988
54	Metalcraft Industries, Inc metalcraftind.com A full-service manufacturer providing precision metal components for various industries, including medical devices, energy, defense, and more Offering CNC machining, sheet metal fabrication, welding, and assembly	Fabricated Metal Products	🇺🇸 Westminster	27	1948
55	Eagle Beverage eaglecoffeeservice.com Specializing in customized coffee and juice solutions, we cater to various industries in Southern California with a focus on top-quality service and customer satisfaction	Food and Beverage Services	🇺🇸 Westminster	23	1990
56	Financial Freedom Inc.financialfreedom-inc.com Independent financial services company offering a wide range of products from reputable companies to protect and grow clients' financial future	Insurance	🇺🇸 Westminster	19	2008
57	Barnes-Bollinger Insurance Services, Inc barnesbollinger.com A company with decades of experience providing personalized insurance solutions, monitoring coverage to ensure it fits clients' evolving needs	Insurance	🇺🇸 Westminster	18	1983
58	Access Venture Partners accessvp.com A Colorado-based venture capital firm investing in early-stage technology companies in emerging venture states, specializing in seed and Series A rounds	Venture Capital and Private Equity Principals	🇺🇸 Westminster	10	1999
59	The Barbour Group, LLC thebarbourgroup.com Specializing in surety bonds and commercial insurance solutions for construction and government contractors, with a focus on overcoming challenges and fostering growth	Insurance	🇺🇸 Westminster	9	2002
60	Strategic Asset Management, Ltd.strategicassetmgt.net A financial services firm offering financial planning, investment management, and insurance solutions to clients	Financial Services	🇺🇸 Westminster	6	1994

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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