The 26 largest companies in Mechanicsburg (2026 list)

#	Company	Industry	Headquarters	Employees	Founded
1	Select Medical careers.selectmedical.com Specialized hospital and rehabilitative care provider operating recovery hospitals, outpatient centers, and occupational health facilities across the United States.	Hospitals and Health Care	🇺🇸 Mechanicsburg	25,292	n/a
2	Select Specialty Hospital selectspecialtyhospitals.com Specializing in critical and complex medical conditions, our hospitals provide tailored programs and services to improve patient wellness and outcomes	Hospitals and Health Care	🇺🇸 Mechanicsburg	3,892	n/a
3	Naval Supply Systems Command (NAVSUP)navsup.navy.mil This company provides supplies, services, and quality-of-life support to the Navy and Joint warfighter, managing supply chains and administering various programs for Sailors	Defense and Space Manufacturing	🇺🇸 Mechanicsburg	3,169	n/a
4	Gannett Fleming gftinc.com A privately held AEC firm providing comprehensive infrastructure solutions in various markets including transportation, water resources, and energy Founded in 1915	Civil Engineering	🇺🇸 Mechanicsburg	1,756	n/a
5	Messiah University messiah.edu A nationally ranked, private university offering undergraduate and graduate programs in arts and sciences with a Christian focus, located in Pennsylvania	Higher Education	🇺🇸 Mechanicsburg	1,673	1909
6	TestingXperts testingxperts.com A global leader in Quality Engineering and Digital Assurance services, offering a comprehensive range of testing solutions for Next Gen technologies	IT Services and IT Consulting	🇺🇸 Mechanicsburg	1,480	2013
7	Vibra Healthcare vibrahealthcare.com Providing patient-centered care with a supportive culture, career growth, flexible hours, and a commitment to clinical excellence.	Hospitals and Health Care	🇺🇸 Mechanicsburg	1,480	2004
8	West Shore Home westshorehome.com A home improvement company focused on quality, convenience, and innovation, committed to providing a top-notch customer experience across the country	Construction	🇺🇸 Mechanicsburg	1,368	2006
9	Pennsylvania Department of Corrections pa.gov Leaders in corrections field, focused on reducing criminal behavior through individualized treatment and education for inmates, promoting successful community reintegration	Law Enforcement	🇺🇸 Mechanicsburg	1,219	1984
10	Regency Hospital Company regencyhospital.com Regency Hospitals, part of Select Medical, specializes in providing comprehensive care to acutely ill patients with catastrophic illnesses or injuries	Hospitals and Health Care	🇺🇸 Mechanicsburg	1,154	n/a
11	Keystone mykeystone.com A rapidly growing insurance brokerage platform acquiring and partnering with independent agencies in the US, providing services and capital for profitable growth Visit website for more	Insurance	🇺🇸 Mechanicsburg	804	2020
12	Duck Donuts duckdonuts.com Warm, delicious, made-to-order donuts served in a family-friendly atmosphere Fast-growing franchise offering unique in-store experience with a variety of donut combinations	Food and Beverage Services	🇺🇸 Mechanicsburg	649	2007
13	Horizon Farm Credit horizonfc.com Agricultural lending cooperative providing farm loans, crop insurance, and rural home mortgages in five states Committed to accountability, collaboration, and stewardship	Financial Services	🇺🇸 Mechanicsburg	434	1916
14	Remco Inc.remcopa.com An employee-owned industry leader providing construction and maintenance services to commercial businesses, specializing in mechanical solutions, HVAC, plumbing, and refrigeration	Construction	🇺🇸 Mechanicsburg	428	1977
15	Fry Communications, Inc.frycomm.com Industry leader in print, distribution, direct mail, and information services with award-winning solutions, cutting-edge technology, and a commitment to excellence	Printing Services	🇺🇸 Mechanicsburg	376	1934
16	Modjeski and Masters modjeski.com A leader in nationwide bridge design, inspection, and rehabilitation services, specializing in various bridge types and offering additional lifecycle services	Civil Engineering	🇺🇸 Mechanicsburg	284	1893
17	Groff Tractor & Equipment grofftractor.com Pennsylvania dealer specializing in John Deere and The Wirtgen Group construction equipment sales, rentals, parts, and service	Retail	🇺🇸 Mechanicsburg	177	1958
18	Fox Subacute Ctr foxsubacute.com A Pennsylvania-based company specializing in post-acute ventilator care, leading in providing essential medical services to patients in need	Hospitals and Health Care	🇺🇸 Mechanicsburg	162	1985
19	Client Solution Architects csaconsulting.com The company specializes in driving value by transforming how clients utilize people, knowledge, technology, and information with high-impact, cost-effective solutions for the public sector	Management Consulting	🇺🇸 Mechanicsburg	155	2003
20	Keystone Insurers Group mykeystone.com Established in 1983, Keystone is a network of over 300 independent insurance agencies offering expertise, specialized products, and community support for success in the industry	Insurance	🇺🇸 Mechanicsburg	151	1983
21	Versatile Credit versatilecredit.com A financial technology provider delivering innovative consumer financing solutions through an omnichannel platform, driving revenue growth and solving unique business problems	Financial Services	🇺🇸 Mechanicsburg	57	1995
22	Info-Matrix Corporation info-matrix.com A woman-owned IT consulting firm offering personalized services to optimize businesses with empowering technology solutions and exceptional customer experience since 1996	IT Services and IT Consulting	🇺🇸 Mechanicsburg	42	1996
23	Adept Consulting Services, Inc.adeptusa.com Adept Consulting Services offers innovative IT solutions for corporations, mid-market organizations, and government agencies to help them achieve their performance goals	IT Services and IT Consulting	🇺🇸 Mechanicsburg	38	1994
24	e-Data Experts, Inc edataexperts.com Information Technology services provider specializing in custom integrated solutions, enterprise portals, big data, mobile applications, and product-based implementations across various industries globally	IT Services and IT Consulting	🇺🇸 Mechanicsburg	24	2003
25	GDC IT Solutions gdcitsolutions.com A trusted technology company managing IT services and solutions for various clients to enhance productivity, maximize technology investments, and improve operational efficiency	IT Services and IT Consulting	🇺🇸 Mechanicsburg	8	1995
26	101 Mobility Harrisburg/Central PA 101mobility.com The company provides high-quality accessibility & mobility equipment such as stair lifts, ramps, patient lifts, elevators, and pool lifts, with excellent service and support	Medical Equipment Manufacturing	🇺🇸 Mechanicsburg	1	2016

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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