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List of manufacturers in Maryland

Tamtam tracks 37 manufacturers headquartered in Maryland. This list ranks all of them by number of employees on LinkedIn, led by McCormick & Company, Perdue Farms and W. R. Grace. Their median headcount is 713. Half of them were founded in 1980 or later. The most common headquarters are Rockville (5), Columbia (4) and Baltimore (2).

๐Ÿ‡บ๐Ÿ‡ธ Maryland37 companiesUpdated Oct 24, 2026
#CompanyIndustryHeadquarters EmployeesFounded
1
McCormick & Companymccormickcorporation.com

A global leader in flavor, McCormick manufactures and distributes spices, seasonings, and other flavorful products to the food industry worldwide

Food and Beverage Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Hunt Valley 14,000 1889
2
Perdue Farmscorporate.perduefarms.com

A fourth-generation, family-owned US food and agriculture business offering premium protein products through responsible practices and a focus on animal welfare

Food and Beverage Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Salisbury 8,392 1920
3
W. R. Gracegrace.com

Supplies catalysts, engineered materials, process technologies, fine chemicals. Industries enhance modern life. Manufactures renewable fuels, pharmaceuticals, food packaging better, faster, smarter.

Chemical Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Columbia 4,244 n/a
4
Hugheshughes.com

Provides broadband equipment, services, and network operations to millions of consumers, businesses, and governments worldwide via satellite and multi-transport technologies.

Telecommunications ๐Ÿ‡บ๐Ÿ‡ธ Germantown 3,209 1971
5
Black & Deckerblackanddecker.com

Manufacturing and providing high-quality, innovative, and valuable tools and machines focused on meeting customer needs and satisfaction.

Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Towson 2,105 n/a
6
Thales Defense & Security, Inc.thalesdsi.com

Global provider of innovative solutions for defense, federal, and commercial markets including communication systems, sonar systems, data protection, and technology integration for various domains

Defense and Space Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Clarksburg 2,013 1964
7
Apex Tool Group, LLCapextoolgroup.com

Global company promoting diversity, inclusion, and respect to create a positive, safe, and inspiring work environment for associates.

Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Sparks Glencoe 1,971 2010
8
X-energyx-energy.com

development and manufacturing of innovative nuclear fuel and reactor designs for safe, affordable, and reliable carbon-free baseload power

Nuclear Electric Power Generation ๐Ÿ‡บ๐Ÿ‡ธ Rockville 1,858 2009
9
United Therapeutics Corporationunither.com

Biotechnology company developing unique products for patients with chronic conditions, with a focus on providing transplantable organs Employees collaborate worldwide

Pharmaceutical Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Silver Spring 1,515 1996
10
Emergent BioSolutionsemergentbiosolutions.com

This company develops, manufactures, and delivers protections against public health threats to defend people and ensure preparedness

Biotechnology Research ๐Ÿ‡บ๐Ÿ‡ธ Gaithersburg 1,366 1998
11
Baltimore Aircoil Companybaltimoreaircoil.com

Design and manufacture advanced evaporative, hybrid, and dry cooling technologies for HVAC, industrial, and refrigeration industries worldwide.

Industrial Machinery Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Jessup 1,250 1938
12
DAPdap.com

Leading manufacturer of home repair and construction products, including caulks, sealants, adhesives, spray foam insulation, and patch products, with a global presence and commitment to employee development

Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Baltimore 1,206 1865
13
STANLEY Engineered Fasteningstanleyengineeredfastening.com

provides advanced fastening and assembly products with global support, engineering expertise, and rapid onsite customer service worldwide

Industrial Machinery Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Towson 1,181 n/a
14
MESO SCALE DIAGNOSTICS, LLC.mesoscale.com

Develops, manufactures, and commercializes assays and instruments for measuring molecules in biological samples, supporting medical research and drug development with proprietary technology.

Biotechnology Research ๐Ÿ‡บ๐Ÿ‡ธ Rockville 1,035 1995
15
Tasly Pharmaceutica Group Co., Ltd.tasly.com

Overseas headquarters of a China-based pharmaceutical company, publicly traded on the Shanghai exchange, focusing on healthcare products and services

Pharmaceutical Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Rockville 875 2006
16
Tatetateglobal.com

The company specializes in access floor and underfloor service distribution solutions for high-performance, sustainable commercial and data center environments, optimizing energy efficiency and infrastructure flexibility

Construction ๐Ÿ‡บ๐Ÿ‡ธ Columbia 817 1963
17
Shimadzu Scientific Instrumentsssi.shimadzu.com

A leader in scientific instrument development, offering analytical solutions, training, collaboration centers, and products to laboratories and research institutions worldwide

Biotechnology Research ๐Ÿ‡บ๐Ÿ‡ธ Columbia 741 1975
18
EVAPCO, Inc.evapco.com

A passionate team of employee-owners revolutionizing global heat transfer applications with top-of-the-line products for evaporative cooling and industrial refrigeration since 1976

Industrial Machinery Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Taneytown 715 1976
19
Centrus Energy Corp.centrusenergy.com

A trusted supplier of nuclear fuel and services, specializing in providing clean, affordable, and carbon-free electricity to utility customers worldwide

Nuclear Electric Power Generation ๐Ÿ‡บ๐Ÿ‡ธ Bethesda 713 1998
20
e-con Systemse-consystems.com

Designing, developing, and manufacturing custom and off-the-shelf OEM camera solutions for various industries, including medical and automotive, with extensive support.

Appliances, Electrical, and Electronics Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Fremont 648 2003
21
Dixon Valvedixonvalve.com

Established in 1916, this company is a leading manufacturer of fluid transfer and control products for various industries, prioritizing safety, durability, and availability

Oil and Gas ๐Ÿ‡บ๐Ÿ‡ธ Chestertown 555 1916
22
dlhBOWLESdlhbowles.com

Supplier of engineered plastic solutions for automotive and consumer products industries, specializing in camera cleaning systems, windshield washers, powertrain components, and consumer sprays

Motor Vehicle Parts Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Columbia 285 1961
23
Thompson Creek Window Companythompsoncreek.com

Dedicated team providing exterior home renovation solutions with a strong culture of teamwork, customer focus, and employee engagement.

Construction ๐Ÿ‡บ๐Ÿ‡ธ Lanham 205 1980
24
American Computer Development, Inc. (ACDi) "โ€‹In Touch With Technology"โ€‹acdi.com

A trusted partner in electronics manufacturing and engineering, offering PCB layout, assembly, testing, and product lifecycle management services to various industries

Appliances, Electrical, and Electronics Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Frederick 135 1984
25
LAI International, LLClaico.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 ๐Ÿ‡บ๐Ÿ‡ธ Westminster 89 1979
26
Cangene bioPharmaemergentcontractmanufacturing.com

Provides fill/finish services for pharmaceutical and biotechnology companies. Aseptically fills liquid and lyophilized products in vials and syringes, with global distribution.

Pharmaceutical Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Rockville 82 1980
27
Mayorga Coffeemayorgacoffee.com

Specialty coffee company working with small organic coffee farmers in Latin America to bring specialty grade coffees to consumers

Food and Beverage Services ๐Ÿ‡บ๐Ÿ‡ธ Rockville 48 1997
28
Durex Incdurexinc.com

Specializing in top-quality metal stampings, sheet metal fabrications, assemblies, and finished products, providing contract manufacturing services

Machinery Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Gaithersburg 47 n/a
29
Homer Optical Company Inc.homeroptical.com

A trusted lab partner for eye care professionals, offering in-house processing of premium lenses, expert training, marketing support, and strong industry relationships

Wholesale ๐Ÿ‡บ๐Ÿ‡ธ Silver Spring 25 1973
30
Maryland Glass & Mirror Company, Inc.mdglass.net

An independent glass fabricator and distributor with over 100 years of experience, offering glass tempering, fabrication, sales, and consultation services

Glass, Ceramics and Concrete Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Baltimore 25 1912
31
ULTRA ELECTRONICS PRECISION AIR & LAND SYSTEMS, INC

A machinery company based in Lanham, Maryland, specializing in precision air and land systems for various applications

Industrial Machinery Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Lanham 12 2001
32
Technology Assessment & Transfer, Inctechassess.com

A high technology company develops and commercializes advanced ceramic materials for defense, bio-medical, and industrial applications, focusing on innovation and technology assessments for government agencies

Research Services ๐Ÿ‡บ๐Ÿ‡ธ Annapolis 10 1991
33
Fallen Lumber Co.fallenlumber.com

Repurposes fallen trees from local sources, transforming them into usable slabs and lumber through milling, drying, and processing for various projects.

Wood Product Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Halethorpe 6 1999
34
River Bottom Roastersriverbottomroasters.com

A family-owned coffee company dedicated to quality, ethical sourcing, fair trade, and community support, crafting delicious coffee to make a difference

Food and Beverage Services ๐Ÿ‡บ๐Ÿ‡ธ Hagerstown 5 2017
35
Quartermaine Coffee Roastersquartermaine.com

This company specializes in roasting high-quality coffee beans to provide customers with a premium coffee experience

Restaurants ๐Ÿ‡บ๐Ÿ‡ธ Bethesda 2 n/a
36
Cmc Cevenini USAlog-slitting-machine.com

A machinery company located in Maryland, specializing in providing high-quality equipment and services to various industries

Machinery Manufacturing ๐Ÿ‡บ๐Ÿ‡ธ Curtis Bay 2 n/a
37
Techtronic Industries North America, Inc.ttigroup.com

Management and growth of established power tools and outdoor product brands, focusing on increasing market share and brand strength.

Software Development ๐Ÿ‡บ๐Ÿ‡ธ Hunt Valley n/a 2000

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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.

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