Given that Falls only has one confirmed victim as of now, and the fact that we don't know the identities of the women on the post it note, I don't think its safe to assume he has any set choice of victim. Also, given the fact that he had a shovel in the back of his car, I think it would be safe to assume Falls buried some of his victims. We also don't know how frequently he traveled, or when he started killing. Just to be safe I went as far back as 1990, considering Falls would have been about 21 at the time being, and most serial killers seem to start killing in their early to mid 20s.
All of these women are prostitutes that have gone missing in states (or surrounding states) Falls is known to have a connection in:
Oregon
http://www.charleyproject.org/cases/d/douglas_stephanie.html - Caucasian female, brown hair/hazel eyes
Went missing from McMinnville, Oregon on November 27, 1990
http://www.charleyproject.org/cases/m/mcclary_eryn.html - Caucasian female, red hair/hazel eyes
Went missing from Eugene, Oregon on August 4, 1995
http://www.charleyproject.org/cases/j/jackson_tanya.html - African-American female, black hair/brown eyes
Went missing from Portland, Oregon on April 22, 1992
http://www.charleyproject.org/cases/j/jenkins_jessica.html - Caucasian female, brown hair/green eyes
Went missing from Portland, Oregon on November 8, 2004
http://www.charleyproject.org/cases/m/maude_heather.html - Caucasian female, blonde hair/green eyes
Went missing from Roseburg, Oregon on July 1, 2009
Washington
http://www.charleyproject.org/cases/k/kowalchuk_tami.html - Caucasian female, blonde hair/blue eyes
Went missing from Tacoma, Washington on December 26, 1999
http://www.charleyproject.org/cases/w/warde_darci.html - Caucasian female, brown hair/blue eyes
Went missing from Seattle, Washington on April 24, 1990 (authorities believe a serial killer was behind her disappearance)
http://www.charleyproject.org/cases/h/honey-hooks_debra.html - Biracial (African-American/Caucasian) female, blond hair/brown eyes
Went missing from Tacoma, Washington on November 6, 2002
http://www.charleyproject.org/cases/m/mouton_danielle.html - African-American female, black hair/brown eyes
Went missing from Seattle, Washington on March 29, 2010
http://www.charleyproject.org/cases/c/cruser_penney.html - Caucasian female, brown hair/brown eyes
Went missing from Spokane, Washington on March 21, 1997
http://www.charleyproject.org/cases/m/moranda_julia.html - Caucasian female, brown hair and blue/hazel eyes
Went missing from Yakima, Washington on December 7, 1990 (Robert Yates is currently a suspect in her disappearance)
http://www.charleyproject.org/cases/c/childs_danica.html - Biracial (African-American/Caucasian) female, brown hair/brown eyes
Went missing from Federal Way, Washington on December 21, 2007
http://www.charleyproject.org/cases/c/collins_kelsey.html - Multiracial (African-American/Caucasian/Native American) female, brown hair/green eyes
Went missing from Everett, Washington on May 9, 2009
California
http://www.charleyproject.org/cases/e/evans_angelina.html - Caucasian female, red/blond hair and green eyes
Went missing from Sacramento, California on May 21, 2001
http://www.charleyproject.org/cases/l/layton_tina.html - Caucasian female, blond hair/blue eyes
Went missing from Sacramento, California on June 7, 1990
http://www.charleyproject.org/cases/l/lucero_stephanie.html - Caucasian female, brown hair/brown eyes
Went missing from Coalinga, California on July 19, 2001
http://www.charleyproject.org/cases/p/pendell-williamson_bridget.html - Caucasian female, brown hair/brown eyes
Went missing from San Francisco, California in April 1997
New Mexico
http://www.charleyproject.org/cases/g/gonzales_felipa.html - Hispanic female, brown hair/brown eyes
Went missing from Albuquerque, New Mexico on April 27, 2005
http://www.charleyproject.org/cases/w/waites_shawntell.html - African-American female, black hair/brown eyes
Went missing from Albuquerque, New Mexico on March 15, 2006
http://www.charleyproject.org/cases/r/reed_vanessa.html - Caucasian female, brown hair/brown eyes
Went missing from Albuquerque, New Mexico on June 13, 2006
http://www.charleyproject.org/cases/v/vigil_anna.html - Caucasian female, blonde hair/blue eyes
Went missing from Albuquerque, New Mexico on January 21, 2005
http://www.charleyproject.org/cases/h/herron_nina.html - Hispanic female, brown hair/brown eyes
Went missing from Albuquerque, New Mexico on May 14, 2005
http://www.charleyproject.org/cases/p/peebles_leah.html - Caucasian female, brown hair/blue eyes
Went missing from Albuquerque, New Mexico on May 22, 2006
Nevada
http://www.charleyproject.org/cases/d/dardanes_camille.html - Caucasian female, brown hair/brown eyes
Went missing from Las Vegas, Nevada in May 1994
http://www.charleyproject.org/cases/p/palumbo_star.html - Caucasian female, brown hair/brown eyes
Went missing from Reno, Nevada on April 26, 2000
http://www.charleyproject.org/cases/f/fourcher_terri.html - Caucasian female, blonde hair/blue eyes
Went missing from Reno, Nevada on August 1, 1996
http://www.charleyproject.org/cases/f/foster_jessica.html - Caucasian female, blonde hair/hazel eyes
Went missing from Las Vegas, Nevada on March 28, 2006 (I think Falls is being investigated in this case)
http://www.charleyproject.org/cases/h/huggins_christina.html - Hispanic female, brown hair/brown eyes
Went missing from Las Vegas, Nevada on August 29, 1994
Arizona
http://www.charleyproject.org/cases/g/gillum_niani.html - African-American female, black hair/brown eyes
Went missing from Phoenix, Arizona on November 2, 2002
http://www.charleyproject.org/cases/p/perry_tiffany.html - Caucasian female, blonde hair/blue eyes
Went missing from Phoenix, Arizona on June 30, 2003
Colorado
http://www.charleyproject.org/cases/o/obregon-gingles_geraldine.html - Caucasian female, brown hair/hazel eyes
Went missing from Aurora, Colorado on August 2, 2001
http://www.charleyproject.org/cases/h/hope_daphne.html - African-American female, black hair/brown eyes
Went missing from Denver, Colorado on August 16, 2001
http://www.charleyproject.org/cases/n/nichols_kara.html - Caucasian female, blonde hair/green eyes
Went missing from Colorado Springs, Colorado on October 9, 2012
Illinois
http://www.charleyproject.org/cases/l/leader_margaret.html - Caucasian female, brown hair/blue eyes
Went missing from Chicago, Illinois on October 10, 2005
http://www.charleyproject.org/cases/k/karras_carina.html - Caucasian female, brown hair/brown eyes
Went missing from Grayslake, Illinois on December 31, 2005. Was supposed to move with a friend to
Las Vegas, Nevada