D
- DD.B. Mackey Insurance Agency
- DDale Oxygen, Inc.
- DDamin Printing Company, LLC
- DDauntless Strength and Athletics
Dave Moses Technology Services, Inc.- DDBD Staffing
- DDeadluck Manufacturing
- DDean Accounting Group
- DDeGennaro's Used Cars & Service
- DDegol Organization
DelGrosso Foods, Inc.
DelGrosso's Amusement Park- DDembert & Hoyne, CPA
- DDennis L. Olewine, Contractor
- DDennis M. Hallinan, Optometry
- DDiAndrea Media, Inc.
- DDiocese of Altoona-Johnstown
- DDiscovery House Blair County
- DDiscovery Wellness Coaching, LLC
- DDixon Tool & Die Co., Inc.
- DDoing Better Business, Inc.
- DDomestic Plumbing & Heating
- DDonna D. Gority
- DDorman's Jewelry
- DDouble Tap Gun Range
- DDQE Communications
- DDrayer Physical Therapy Institute
- DDreams Go On
- DDrs. Reed & Sahlaney, Orthodontics
- DDuncansville Pharmacy, Inc.
- DDurbin Companies