Here is a list of potential victims aged 15 - 40 who disappeared from the Northern Midwest between 2001 and 2013. I chose 2001 because that's when the first incident (the woman trying to escape from Zelich's home) occurred. All are below 5'6 in height and the majority are under 130 pounds.
The cases in this list include more vulnerable women (particularly those with a history of drugs and/or prostitution) and cases where there is too little information to judge. Many cases have been ruled out by me for various reasons - the woman didn't fit the physical stats, it was a MWAB case, or the circumstances make it extremely unlikely that Zelich was involved. I didn't limit the search to women who went missing after going to meet someone online, because we don't know how long this has been going on or whether he met all his victims that way.
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IOWA
http://www.charleyproject.org/cases/h/hasley_melissa.html
Caucasian female. 31 years old. 5'4 or 5'5, 90 - 128 pounds. Has a history of drug use and prostitution.
Jeannie Hernandez
Caucasian female. 20 years old. 5'4, 127 pounds.
Adalia Alvarez
Caucasian female. 25 years old. 5'3, 120 pounds.
ILLINOIS
Carina Karras
Caucasian female. 20 years old. 5'0, 107 pounds. Last seen boarding a Metro Train and was supposed to meet a friend to move to Las Vegas.
Jamie Harper
Caucasian female. 20 years old. 5'0, 130 pounds. Last seen leaving a party.
Yashajara Angelino
White Hispanic female. 21 years old. 5'4, 110 pounds.
Amanda Simon
Hispanic female. 17 years old. 5'1, 125 pounds. May be in the company of an adult male.
INDIANA
Ronel Alsup
Caucasian female. 25 years old. 5'4, 130 pounds.
Jessica Masker
Caucasian female. 24 years old. 5'2, 95 pounds. History of drug use.
MICHIGAN
Sara Yilmaz
Caucasian female. 17 years old. 5'5, 119 pounds. May be in the company of an adult male and may have traveled to Florida (important because Zelich had ties to Boca Raton)
Sarah Vitt
Caucasian female. 5'2, 90 pounds. History of drug abuse.
Kimberly Stoner
Caucasian female. 5'3, 103 pounds. Drove away from home on her own accord; neither she or her car have been found.
Elizabeth Land
Caucasian female. 24 years old. 6'3, 130 pounds. Last seen leaving home to meet a friend at a bar.
Eva Potka
Caucasian female. 24 years old. 5'0, 100 pounds. Told employer and friends she was going to Ohio for a family reunion, but no reunion existed and she doesn't even have family in Ohio.
Alexis Duff
Caucasian female. 17 years old. 5'6, 125 pounds. It says she may be with a female companion, but I don't know.
Sylvia Galvan
Hispanic female. 20 years old. 6'1, it says she's 150 but she does not look it. Foul play suspected.
Linda McAllister
Caucasian female. 33 - 36 years old. 5'4 - 5'6, 100 - 110 pounds.
Ariel Fields
Caucasian female. 17 years old. 5'3, 130 pounds.
Michelle Lokker
Caucasian female. 29 years old. 5'4, 115 pounds. Her car was discovered abandoned and some of her clothing floating in the Kalamazoo River.
MINNESOTA
Kateri Mishow
Native American female. 22 years old. 5'2 - 5'3, 100 pounds.
April Pease
Caucasian female. 30 years old. 5'3, 120 pounds.
Areli Pacheco
Hispanic female. 23 years old. 5'3, 125 pounds.
NEBRASKA
Melinda Jacobs
Caucasian female. 16 years old. 5'3, 140 pounds.
Yanel Herera-Flores
Hispanic female. 16 years old. 5'1, 130 pounds.
Dinora Garcia
Hispanic female. 18 years old. 5'0, 100 pounds.
Alina McFarland
Caucasian female. 17 years old. 5'4, 140 pounds. Last seen carrying a red bag; depending on the size, it could fit with being told to ''pack lightly'', like AstroKitty mentioned.
Samantha Nelson
Caucasian female. 18 years old. 5'2, 110 pounds.
Rachelle Williams
Caucasian female. 18 years old. 5'1, 115 pounds. Neither her or her car have been found.
SOUTH DAKOTA
Rachel Cyriaks
Caucasian female. 30 years old. 5'5, 135 pounds.
WISCONSIN
Rose Bly
Caucasian female. 21 years old. 5'0, 110 pounds.
Stephanie Low
Caucasian female. 22 years old. 5'3, 130 pounds.
Heather Szekeres
Caucasian female. 5'4 - 5'5, 110 pounds.
Susan Nunez
Hispanic, 4'11, 90 pounds. Had a history of drug/alcohol abuse and would often accept rides from strangers. Went missing only 7 miles from West Allis.