Check out SDB's maps and lists, including information from sister publication Recycling Today:

 
North America's Largest Electronics Recyclers (published July/August 2010)
The largest electronics recyclers in North America ranked by the volume of electronic scrap processed in 2009.

From Recycling Today:

20 Largest Plastics Recyclers (published July 2011)
This list ranks the largest recyclers of post-industrial and post-commercial plastics in North America.

Largest Nonferrous Metal Recyclers (published April 2010)
A ranking of North America's largest nonferrous metals processors.

North America's Largest Paper Stock Dealers (published January 2010)
North America's largest paper stock dealers as ranked by total tonnage shipped in 2009.

Wire Chopper Locations in North America (published October 2009)
North America's wire chopping operations listed by state and province. 

20 Largest Ferrous Scrap Recyclers in North America (published April 2009)
The largest ferrous scrap procsesors in North America as ranked by gross tons processed in 2008.

20 Largest Paper Stock Consumers in North America (published January 2009)
A ranking of the largest paper stock consumers in North America by tons consumed in 2008.