Organizers
- Dodgeville (Iowa County Soccer League)
- Dog Days Half Marathon
- Dog Star Adventure Tours
- Doggy Dash Cause for Paws
- Dogwood Canyon Audubon Center
- Dogwood Dart 5K Trail Run/Walk
- Doherty High School
- Doing For Others Today
- Dojo2go.com Kids Empowerment Camp @ TriFit Club & Studios
- Dolphins Community Aquatics Association
- Domenici Fitness Center
- Domestique Tours
- Dominative Development
- Dominican University of California Sports Camps
- Dominik Mueller's Tennis Camps
- Dominique Moceanu Gymnastics Center & Camp
- Dominique Moceanu Summer Gymnastics Camps
- Don Harrington Discovery Center
- Don Law Golf Academy
- Dona Lerner Golf Academy Inc
- Donadea Running Club
- Donadea Wheelers
- Donald Edwards Jr. Memorial Fund
- Donald Ross GC
- Donate Life Northwest
- Donation Life Northwest
- Donegal Baseball & Softball Association
- Donegal Foundation 5K
- Donohue Hockey Skills
- Dons FRIENDS
- Don's KTC
- Don's Run - Don Lintereur Memorial Run
- Donut Dash
- Donuts Camp
- Doodle Dynamo Northern Virginia
- DOPE Foundation
- Dorado Beach Resort & Club
- Dorado del Mar Golf Club
- Doral Academy of Northern Nevada
- Dorchester County Family YMCA
- Do-Right Timing
- Dorothy O'Connor Pet Adoption Center
- Dorsa Elementary School
- Dos Cabezas Winery
- Dos Pueblos High School Summer Swim & Camps
- Double Edge Fitness
- Double J Riding Club
- Double Play Sports Community Center Inc.
- Double Play Tournaments
- Double Road Race Federation
