There are 20 named victims and he claimed he killed 30. They found certain bodies only based on his last minute confession, so we can assume he was also telling the truth about the bodies they didn’t find.
Here’s a list in order of the women he killed, including the 10 unconfirmed based on his claims:
Unknown Woman (Washington 1973)
Unknown Woman (Washington 1973)
Unknown Woman (Washington 1973)
Lynda Healy (Washington 1974)
Donna Manson (Washington 1974)
Unknown Woman (Oregon 1974)
Susan Rancourt (Washington 1974)
Roberta Parks (Washington 1974)
Brenda Ball (Washington 1974)
Georgann Hawkins (Washington, Strangled 1974)
Unknown Woman (Oregon 1974)
Unknown Woman (California 1974)
Janice Ott (Washington 1974)
Denise Naslund (Washington 1974)
Unknown Hitchhiker (Idaho 1974)
Nancy Wilcox (Utah 1974)
Melissa Smith (Police Chief Daughter Utah, Strangled with Stocking 1974)
Laura Aime (Utah, Strangled with Stocking 1974)
Debra Kent (Utah 1974)
Unknown Woman (Utah 1974)
Unknown Woman (Utah 1974)
Unknown Woman (Utah 1974)
Caryn Campbell (Colorado Nurse, Bludgeoned 1975)
Julie Cunningham (Colorado Ski Instructor, Strangled 1975)
Denise Oliverson (Colorado 1975)
Lynette Culver (Idaho 12 Year Old Drowned 1975)
Susan Curtis (Utah 1975)
Margaret Bowman (Florida, 1978)
Lisa Levy (Florida 1978)
Kimberly Leach (Florida 12 Year Old 1978)