Companies Headquartered in Montgomery County

More than 118 major companies with 100 or more employees are headquartered in Montgomery County.

Company Industry Primary City
A. Morton Thomas and Associates, Inc. Engineering Rockville
ABT Associates Government Contractor Bethesda
Access Intelligence LLC Manufacturing Rockville
Adventist Healthcare, Inc. Healthcare Rockville
Aeras Healthcare, Pharma & Biotech Rockville
American Capital Strategies, Inc. Finance Bethesda
American Nurses Association Not for Profit Silver Spring
American Society of Health-System Pharmacists Not for Profit Bethesda
American Speech Language Hearing Association Association Gaithersburg
Aronson & Company Business Services Rockville
Athena Consulting Consulting Germantown
Avendra, LLC Construction Rockville
B.F Saul company Hotel Division Real Estate & Construction Bethesda
Balducci’s Retail Bethesda
Bioqual Healthcare, Pharma & Biotech Rockville
BioReliance Healthcare, Pharma & Biotech Rockville
Boland Trane Services, Inc. Wholesale & Distribution Gaithersburg
Broadsoft, Inc. Technology Gaithersburg
Century Distributors Distribution Rockville
Certified Building Services, Inc. Other Derwood
Choice Hotels International, Inc. Recreation & Leisure Rockville
Clark Construction Group Construction Bethesda
CNSI Technology Rockville
Coakley and Williams Construction Real Estate & Construction Bethesda
Community Pool Management Real Estate & Construction Rockville
Concrete General, Inc. Real Estate & Construction Gaithersburg
Coventry Health Care Insurance Bethesda
Criswell Chevrolet Retail Gaithersburg
Cystic Fibrosis Foundation Non-Profit Bethesda
Danya International Healthcare Silver Spring
Dataprise, Inc. Technology Rockville
Development Alternatives Inc. (DAI) Business Services Bethesda
Digital Management (DMI) Technology Bethesda
Discovery Communications Entertainment Silver Spring
Eagle Bancorp, Inc. Banking Bethesda
Emergent Biosolutions Healthcare, Pharma & Biotech Rockville
Envelopes Unlimited, Inc. Manufacturing Rockville
Europ Assistance USA Travel Services Bethesda
Federal Realty Investment Trust Real Estate & Construction Rockville
Financial Industry Regulatory Authority Association Rockville
First-Potomac Realty Trust Real Estate & Construction Bethesda
Forrester Construction Company Construction Rockville
Foulger-Pratt Management Real Estate & Construction Rockville
Francis O Day Co Real Estate & Construction Rockville
Gali Service Industries Janitorial Services Rockville
GEICO Insurance Chevy Chase
Global Exchange Services (GXS) Technology Gaithersburg
Grunley Construction Co., Inc. Construction Rockville
Henry M Jackson Foundation For the Advancement of Military Medicine Healthcare Rockville
Highway and Safety Services, Inc. Real Estate & Construction Gaithersburg
Holy Cross Hospital of Silver Spring Healthcare Silver Spring
Host Hotels & Resorts, Inc. Recreation & Leisure Bethesda
Howard Hughes Medical Institute (HHMI) Non-Profit Chevy Chase
Hughes Communications Telecommunications Germantown
IMSG Technology Rockville
Intelligent Automation Technology Rockville
Iq Solutions, Inc. Technology Rockville
JBG Companies Real Estate & Construction Chevy Chase
JBS International Technology N. Bethesda
J Craig Venter Institute Education Rockville
Kaiser Permanente of the Mid-Atlantic States Healthcare, Pharma & Biotech Rockville
Kay Apartment Communities Real Estate & Construction Silver Spring
Kids After Hours Education Silver Spring
Kirlin Group Real Estate & Construction Rockville
Landon School Education Bethesda
Lerch, Early & Brewer Consulting Bethesda
Lerner Companies Real Estate & Construction Rockville
Lockheed Martin Headquarters Technology Bethesda
Macrogenics Healthcare, Pharma & Biotech Rockville
Manders Decorating Company Real Estate & Construction Silver Spring
Mariam, Inc. (dba DARCARS) Retail Silver Spring
Marriott International Hospitality Bethesda
McFall and Berry Landscape Mgt Landscaping Brookeville
Meso Scale Diagnostics Healthcare, Pharma & Biotech Rockville
Miller and Long Real Estate & Construction Bethesda
Novavax Healthcare, Pharma & Biotech Rockville
OMV Medical Healthcare, Pharma & Biotech Takoma Park
Pleasants Construction (Core Commercial) Real Estate & Construction Clarksburg
Potomac Minute Maids Janitorial Services Rockville
Qiagen (North American HQ) Biotechnology Germantown
RainKing Solutions Technology Bethesda
Red Coats, Inc. Janitorial Services Bethesda
Retail Services and Systems (d/b/a Total Wine and More) Business Services Potomac
Ridgewell’s, Inc. Other Bethesda
RMA Worldwide Chauffeured Transportation Transportation Rockville
Roberts Oxygen Manufacturing Rockville
Ruppert Landscape Landscaping Laytonsville
Sandy Spring Bank Banking Olney
SEEC Not for Profit Rockville
Shapiro and Duncan Real Estate & Construction Rockville
Shulman Rogers Law Firm Potomac
Singleton Electric Co Real Estate & Construction Gaithersburg
Smokey Glen Farms Agriculture Gaithersburg
Social & Scientific Systems, Inc. Technology Silver Spring
Sodexo (North American HQ) Food & Beverage Gaithersburg
Strathmore Hall Foundation, Inc. Recreation & Leisure North Bethesda
Synergy Enterprises Technology Silver Spring
Technical Resources International, Inc. Consulting Bethesda
Terrapin Systems Technology Rockville
Thales Defense & Security, Inc. Electronics Clarksburg
The ARC of Montomery County Other Derwood
The Calvert Group Finance Bethesda
The Emmes Corporation Technology Rockville
The RitzCarlton Hotel Company Recreation & Leisure Chevy Chase
TV One Entertainment Silver Spring
Ultra Electronics 3eTI Defense/Aviation Rockville
United Therapeutics Biotechnology Silver Spring
US Pharmacopeia Healthcare, Pharma & Biotech Rockville
Wedding Wire Technology Chevy Chase
Westat Consulting Rockville
Zenimax Media Consulting Rockville