The disappearance of Gabby Petito captured the nation's attention and attracted the sleuthing skills of thousands on social media who shared her story and even turned up leads.
Thousands more need that same level of care and attention, too, officials say.
Hundreds of thousands of people go missing every year, according to FBI data. In 2020, more than 540,000 people went missing, including more than 340,000 juveniles, according to the data.
In May, the FBI conducted an internal audit of its field offices and compiled a list of 43 active missing persons cases of people under the age of 21 that the agency says need fresh leads. Some date back decades.
The agency conducted the audit around National Missing Children’s Day, May 25, as part of an annual practice of taking inventory of ongoing cases, said Siobhan Johnson, an FBI special agent and spokesperson in Chicago who provided the list to USA TODAY.
"We are just looking for fresh leads," Johnson said, noting the list is hardly all-inclusive. "Now is a good time to start soliciting for additional information."
Thomas Lauth, who runs a missing persons agency in Indianapolis, said the combination of factors in Petito’s case — the multiple states involved, videos of the couple arguing and a 911 call about her fiancé slapping her — made for headlines.
But underlying all this is what experts call "missing white woman syndrome," in which white women — particularly young, attractive and blonde — get the majority of the media’s attention.
Wealth and class also play a role, so much so that Lauth advises clients of all backgrounds to create GoFundMe pages, hold vigils, contact the media and be available for interviews to drive awareness.
Everyone's talking about Gabby Petito: But they're having the wrong conversation, experts say
FBI list of 43 unsolved missing cases of people under the age of 21
Here's the list, by date of disappearance:
Daniel Barter was 4 years old when he went missing from Perdido Bay, Alabama, on June 18, 1959.
William "Billy" Ebeneezer Jones Jr. was 3 when he went missing from Vineland, New Jersey, on Dec. 17, 1962.
Christine Marie Eastin was 19 when she went missing from Hayward, California, on Jan. 18, 1971.
Margaret Ellen Fox was 14 when she went missing from Burlington, New Jersey, on June 24, 1974.
Tammy Mahoney was 19 when she went missing from Oneida, New York, on May 8, 1981.
Anthonette Christine Cayedito was 9 when she went missing from Gallup, New Mexico, on April 6, 1986.
Tara Leigh Calico was 19 when she went missing from Valencia County, New Mexico, on Sept. 20, 1988.
Ilene Beth Misheloff was 13 when she went missing from Dublin, California, on Jan. 30, 1989.
Mark Himebaugh was 11 when he went missing from Del Haven, New Jersey, on Nov. 25, 1991.
Crystal Ann Tymich was 6 when she went missing from South Los Angeles, California, on June 30, 1994.
Cayce Lynn McDaniel was 14 when she went missing from Milan, Tennessee, on Aug. 16, 1996.
Kristen Modafferi was 18 when she went missing from San Francisco, California, on June 23, 1997.
Suzanne G. Lyall was 19 when she went missing from Albany, New York, on March 2, 1998.
Karla Rodriguez was 7 when she went missing from Las Vegas, Nevada, on Oct. 20, 1999.
Asha Jaquilla Degree was 9 when she went missing from Shelby, North Carolina, on Feb. 14, 2000.
Steven Earl Kraft, Jr. was 12 when he went missing from Benton Township, Michigan, on Feb. 15, 2001.
Bethany Leanne Markowski was 11 when she went missing March 4, 2001. Location is undetermined.
Wesley Dale Morgan was 2 when he went missing from Clinton, Louisiana, on May 15, 2001.
►Read more about this case: Two missing sisters. One bizarre note. For 20 years, a family has asked: Where are our girls?
Rachel Louise Cooke was 19 when she went missing from Georgetown, Texas, on Jan. 10, 2002.
Alexis S. Patterson was 7 when she went missing from Milwaukee, Wisconsin, on May 3, 2002.
Tabitha Danielle Tuders was 13 when he went missing from Nashville, Tennessee, on April 29, 2003.
Joshua Keshaba Sierra Garcia was 1 when he went missing from Mexico City, Mexico, on Aug. 12, 2003.
Amber Elizabeth Cates was 16 when she went missing from Columbia, Tennessee, on April 11, 2004.
Ashley Summers was 14 when she went missing from Cleveland, Ohio, on July 7, 2007.
Kyron Richard Horman was 7 when he went missing from Portland, Oregon, on June 4, 2010.
Shanna Genelle Peoples was 19 when she went missing from Geneva, Alabama, on Sept. 8, 2011.
Keiosha Marie Felix was 15 when she went missing from Duson, Louisiana, on April 30, 2012.
Myra Lewis was 2 when she went missing from Camden, Mississippi, on March 1, 2014.
Kaylah Hunter was 9 and Kristian Justice was 7 months when they went missing from Detroit, Michigan, on May 24, 2014.
Belel Kandil was 8 and Amina Kandil was 10 when they went missing from New York City on Aug. 29, 2014.
Sara Nicole Graham was 18 when she went missing en route to Pembroke, North Carolina, on Feb. 4, 2015.
Arianna Fitts was 2 when she went missing from Oakland, California, on Feb. 1, 2016.
Lashaya Stine was 16 when she went missing from Aurora, Colorado, on July 15, 2016.
Sunny Sramek was 18 when she went missing from Trenton, Nebraska, on April 20, 2019.
Dulce Maria Alavez was 5 when she went missing from Bridgeton, New Jersey, on Sept. 16, 2019.
This article originally appeared on USA TODAY: FBI missing persons cases list: 43 unsolved cases that need leads