24PetWatch
3315 E Algonquin Suite 450
Rolling Meadows, IL 60008
Registry: 1-866-597-2424
www.24petwatch.com
Type of Chip:  Allflex 125 MHz

Avid
3179 Hammer Ave
Norco, CA 91760
Registry:  1-800-336-AVID (2843)
Type of Chip:  Avid

Companion Animal Recovery
5580 Centerville Drive Suite 250
Raleigh, NC 27606
Registry:  1-800-252-7894
Type of Chip:  n/a

HomeAgain
1095 Morris Ave
PO Box 3182
Union, NJ 07083-1982
Registry:  1-866-738-4324
Type of Chip:  Destron-Fearing

InfoPet
415 West Travelers Trail
Burnsville, MN 55337
Registry:  1-800-INFO-PET
Type of Chip:  Trovan