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Double Groove Brewing Company grew from four Harford County friends’ shared brewery-hopping habit into a Forest Hill brewery where craft beer and classic rock vinyl are part of the same experience. The four owners shaped the taproom around Craig’s collection of more than 3,000 albums, while brewer Mark advanced his training through the American Brewers Guild after their home-brewed IPA won a local competition. Its name refers to the rare record groove that can send a needle to different tracks—an apt idea for a tap list that changes from visit to visit.
From its Milwaukee base, Douglas Dynamics manufactures and upfits work-truck attachments and equipment, including snow and ice-control gear and custom commercial-vehicle solutions. Its brand family traces back to 1946, while the company today operates seven manufacturing locations and 15 installation and distribution centers with more than 1,600 team members. Continuous improvement through its Douglas Dynamics Management System is central to how the company develops and builds equipment sold across North America, Europe, and Asia.
On a 100-acre family farm outside Rising Sun, Dove Valley Winery makes wines from its own vineyard, which Harry and Janet Hepbron planted in 1998 as Cecil County’s first vineyard and winery. The multi-generation operation was built as a family legacy, and its wines have earned Best in Class and medal recognition at the Maryland Governor’s Cup and Finger Lakes International competitions.
Doyle Organics develops plant-based crop treatments for growers seeking alternatives to conventional chemical pest control. Its formulations use natural plant defenses to help protect crops while keeping pollinators present and supporting healthier soil.
Founded by brothers Barney and Burton Doyle in 1926, Doyle Printing & Communications is a family-run Hyattsville printer producing commercial print and direct-mail work alongside newer digital communications services. Now in its fourth generation, the Doyle family combines traditional union craftsmanship with modern inkjet, digital and G-7 Certified press capabilities. The company is FSC Certified and also supports clients with media production, fulfillment and mail preparation.
Dragon’s Breath Aromatics grew from Gilbert McNew’s years of hiking, camping, and backpacking, with daughter Madison joining to develop the idea and test formulas in a fly-ridden farm barn. The McNews make all-natural insect repellents for fellow outdoorsmen, using recyclable and compostable packaging to reduce the trash left behind on trails and at campsites.
Drape Kings provides event drape and hardware rentals, production support, and custom fabrication for special events and staging. Founded more than two decades before the site's description, it built its business around drape rental and now supports projects from bid through strike with in-house fabrication, installation crews, and a fleet of trucks.
Dress It Up Dressing turns a mother’s homemade recipe into bottled salad dressings, made with 100% olive oil and simple ingredients. Founded by Sophia Maroon after her family used the dressing to coax four children into eating vegetables, the company grew from a neighborhood delivery service into a brand sold in more than 1,700 stores nationwide. Its Sesame Tahini dressing has earned two sofi Awards and a 2024 Good Food Award, while the women-owned company is also a certified B Corp.
With nearly a century of U.S. ice cream experience, Dreyer’s Grand Ice Cream is the American arm of global ice cream group Froneri. Based in the Bay Area, the company employs more than 2,400 people and makes frozen treats for consumers across the United States, including its well-known Häagen-Dazs brand.
Founded in 1993 by engineer Bob Perini, DrinkMore Water is a locally owned Gaithersburg company that purifies, bottles and delivers drinking water to homes and offices across the DMV. Its 40,000-square-foot plant uses a 12-step purification system and supports the company’s distinctly local approach, with DC-area staff answering calls and the business supporting hundreds of community causes each year. DrinkMore’s purified water won Best Purified Water at the 2025 Berkeley Springs International Water Tasting Competition.
Drizzle Health is a Baltimore-based health technology company known for addressing the often-overlooked sample-concentration gap in diagnostics. Its patented polymer platform helps clinical, food-safety, and environmental testing teams detect low levels of microorganisms from difficult samples, including through its MagnaSlide and MagnaFlow products.
A wholly owned subsidiary of US-based Thales Defense & Security, Inc., DRT, Inc. has spent nearly 30 years serving Department of War and Intelligence Community customers from its Germantown, Maryland headquarters. The company designs and manufactures ruggedized Software Defined Radio systems for government missions involving the electromagnetic spectrum, with nearly 140,000 square feet of industrial space and 50,000 square feet dedicated to manufacturing.
DS Smith makes sustainable packaging and paper products and operates a European network of 12 paper mills producing around 4 million tonnes of corrugated case materials and specialist industrial products annually. The company also provides recycling services, and its stated purpose is to help customers respond to changing shopping habits with sustainable packaging solutions.
DSG Technology develops patented ammunition for military and law-enforcement use, including projectiles designed to remain accurate and effective across air and underwater environments. Its CAV-X system enables air-to-water and water-to-water engagement, while the XMP line is engineered to improve penetration and add anti-materiel capability to existing weapon systems without modification. The company says its current management team has turned a decade of research into field-ready technology.
DSI, Inc. is a custom job shop and equipment repair facility providing custom machining, metal fabrication, metallizing, specialty coatings, equipment repair, installation, and machine shop services. It serves water and wastewater, industrial process, utility, commercial, and government installations.
dsm-firmenich is a global creation and innovation partner that manufactures and combines ingredients for nutrition, health, and beauty. Its three businesses span Perfumery & Beauty, Taste, Texture & Health, and Health, Nutrition & Care; the company says its global team numbers nearly 21,000 people and operates across more than 100 countries.
With more than 30 years in the Hagerstown area, DST provides the U.S. Department of Defense, law enforcement and federal agencies with airborne and ground-based platforms for sensor testing, training and research. Its fleet of more than ten specially integrated fixed-wing aircraft supports mission operations, while its engineering team handles aircraft modification and systems integration for customer-owned platforms. Founded by Dana, a former radar systems engineer for the F-15 Eagle and B-2 Bomber, DST has completed more than 40 special-mission aircraft integrations.
Since 1996, DuClaw Brewing Company has made craft beer in a spirit of experimentation, from its glittered Sour Me Unicorn Farts collaboration to its year-round Sweet Baby Jesus! porter. Founded by Dave Benfield, the brewery describes beer-making as an art and has built a distribution network reaching 24 states, the District of Columbia, and Canada.
Duke Printing is a Rockville printing company serving business customers with on-demand print work. It combines press and digital production for projects such as personalized business cards, with specialty finishing available when a piece calls for it.
Since 1972, Dulles Glass has grown into a large East Coast glass fabricator serving homeowners, businesses, and government agencies nationwide. Based in Manassas, Virginia, the company carries more than 100,000 square feet of inventory and fabricates about 1.2 million square feet annually, with local installation available across the Mid-Atlantic.