- Dan Frazier Productions1
- David Sivolella1
- David Weeks and Company5
- David Welch Associates4
- Delaware Tribe of Indians157
- Dillon Communications2
- Direct5
- Dixon Media Group, Inc.13
- Doak, Carrier and Associates7
- Doak, Carrier, O'Donnell, and Associates2
- Doak, Shrum and Associates4
- Doak, Shrum, Harris, Carrier, and Devine36
- Doak, Shrum, Harris, Sherman and Donilon2
- Dole, Robert J., 1923-20211
- Don Hoover and Associates15
- Doug Marker1
- Doug Zabel and Associates3
- Dresner, Sykes, Jordan and Townsend, Inc.4
- Edmonds Powell Media4
- Edward Mitchell Communications2
