- The Media Audit
- Scarborough
- Nielsen
- Mediamark
- Webopedia
- Internet Advertising Bureau
- comScore
- Compete
- Quantcast
- OpenX
- 24∗7/Real Media
- DoubleClick
- Mashable
- MediaMind
- Digiday
- HubSpot
- ShareThis
- PointRoll (Gannett Co.)
- PointRoll Blog
- ShopLocal Products
- Verve Wireless
- Retail Advertising & Marketing Association
- Radio Advertising Bureau
- Audit Bureau of Circulation
- Audit Bureau of Circulation - News Bulletin
- Verified Audit Circulation
- Verified Audit Circulation – Viewpoint
- BPA Worldwide
- Circulation Verification Council
- Certified Audit of Circulations
- SRDS (Media Rates & Planning Data)
- U.S. Census Bureau
- Newseum
- NetNewsCheck- Local digital media
- The State of the News Media
- Editor & Publisher
- MediaPost
- Business Insider
- Newspaper Association of America
- Mashable (social media news/guide)
- California Newspaper Publishers Association
- Association of Free Community Papers
- Associated Press
- Business Journals
- Independent Free Papers of America
- City and Regional Magazine Association
- Suburban Newspapers of America
- A.H. Belo
- Cox Media Group
- Gannett
- Lee Enterprises/
- McClatchy
- MediaNews Group
- Media General
- Stephens Media Group
- Tribune Company
- New York Times
- Seattle Times
- Times-Shamrock
- Gatehouse Media
- Hearst
- Metromix