Thousands of people go missing in the United States each year and many are never heard from again.
According to the National Center for Missing and Exploited Children, roughly 800,000 children are reported missing each year in the United States -- that's roughly 2,000 per day.
Here are a few people, both children and adults, that the FBI and local authorities are actively looking for. Read more to find out how you can help bring them home.
|Kyron Horman, Now 10|
Almost three years after Kyron Horman disappeared from school, there is still no sign of the Portland, Ore., second grader and no arrests have been made.
The National Center for Missing and Exploited Children released an age-progression photo of the boy on Jan. 29, 2013, to show what he might look like today. He would be 10 years old.
The Multnomah County Sheriff's Office on Jan. 29, 2013, said the case is a "continuing investigation" and investigators are still following up on leads as they come in.
Horman vanished from his elementary school on June 4, 2010, shortly after giving a science fair presentation on frogs. While investigators and volunteers initially scoured the neighborhood and dense forest surrounding the school, speculation turned to Kyron's stepmother, Terri Horman, who said she dropped him off at school that day.
Though Terri Horman has not been charged, a judge called her a "prime suspect" in the boy's disappearance during a hearing on Aug. 22, 2012.
According to the Associated Press, Kyron's mother, Desiree Young, is suing Terri Horman, seeking a court order to force her to say what happened to the boy.
If you have any information about Kyron Horman, contact the Multnomah County Sheriff's Office at 503-255-3600.
|Lauren Spierer, Now 22|
Lauren Spierer was last seen leaving a sports bar at 4:30 a.m. on June 3, 2011, in Bloomington, Ind., where she had just finished her sophomore year at Indiana University.
The investigation into the disappearance of the petite fashion major from Greenburgh, N.Y., has taken many turns, yielding thousands of tips and several persons of interest.
Little remains known about what might have happened to Spierer.
Spierer's parents in December 2012 said they do not believe their daughter's disappearance was a "random abduction." They slammed the male friends of their daughter who, they said, were the last to see her before she vanished.
"We have these boys that were there that night that clammed up, shut down, lawyered up," Spierer's father, Robert Spierer, said on "Katie."
Though there have been no arrests in the case, Capt. Joe Qualters of the Bloomington Police Department said Jan. 29, 2013, it is still an active investigation, "which implies that we are still following up on leads, which we are doing." CLICK HERE to read more about Lauren Spierer's disappearance.
The Bloomington Police Department is asking anyone with information about her whereabouts to call 812-339-4477.
|Kelli Bordeaux, Now 23|
Pfc. Kelli Bordeaux, 23, stationed at Fort Bragg, N.C., was last seen leaving Froggy Bottoms bar in Fayetteville, N.C., around 1:20 a.m. on April 14, 2012, and hasn't been heard from since.
Police in Fayetteville turned up no new leads after searching a pond and woods in the area for signs of the missing soldier. Detectives issued a public plea for anyone who was at the bar that night to call a hotline that was set up to collect leads.
Authorities are asking anyone with information about her disappearance to call (910) 433-1529.
|Lisa Irwin, Now 2|
Police are baffled over the case of Lisa Irwin, an infant who disappeared from her crib in the middle of the night in Kansas City, Mo., and would have turned 2 on Nov. 11, 2012.
Baby Lisa was last seen asleep in her crib when her mother, Deborah Bradley, said she checked on her at 10:30 p.m. on Oct. 3, 2011. The infant's father, Jeremy Irwin, discovered Lisa was missing when he arrived home at 4 a.m. the following morning after working the overnight shift. The parents immediately called the police.
Police have been suspicious of the parents' story since their initial questioning. Bradley said that police accused her of having done something to her child, and also accused her of failing a polygraph test.
Lisa has blue eyes, blond hair, is 30 inches long and weighs between 26 and 30 pounds. She was last seen wearing purple shorts and a purple shirt with white kittens on it. She has a beauty mark on her right outer thigh.
The Kansas City Police Department requests that anyone with information regarding the baby's whereabouts to please call their missing persons hotline at 816-234-5136.
|Ayla Reynolds, Now 2|
Ayla Reynolds, 2, of Waterville, Maine, was taken from her crib the night of Dec. 16, 2011, her father told police.
The father, Justin DiPietro, said he put the child to bed the night of Dec. 16, 2011, in his home, and awoke the next day to find her missing, according to police. Several other adults were in the home that night, police said, including one non-relative. Ayla was living with her father while the girl's mother, Trista Reynolds, 23, was in rehab for substance abuse.
Investigators still have no sense of what happened to Ayla. She has blond hair, blue eyes was last seen wearing green, polka-dotted pajamas.
The Maine State Police have taken over the case, which remains an "open and active" investigation.
Anyone with information is asked to call the main number for the Maine State Police in Augusta, Maine, at 207-624-7076.
|Sky Metalwala, Now 3|
There is still no sign of missing 3-year-old Sky Metalwala, and police have said his mother's account of what happened on the day her son disappeared is suspicious.
The FBI searched for the toddler, who has been missing since Nov. 6, 2011, after his mother, Julia Biryukova of Redmond, Wash., said she left him alone for an hour in a disabled car in Bellevue, Wash.
Biryukova told police she was driving with her two children when she ran out of gas on 112th Avenue. She and her 4-year-old, Maile Metalwala, trekked about a mile to a nearby gas station, Northtowne Chevron Service, leaving Sky in the car, she said.
Biryukova did walk to the gas station that morning, police said, but she never bought gas there, and her story was "strikingly similar in nature" to a "Law & Order" episode.
Sky's father, Solomon Metalwala, who is separated from his wife, told ABC News in 2011 that he believed she was responsible for their son's disappearance. The couple had a troubled history that included a citation for leaving Sky alone in a parked car at a Target parking lot in 2009 and angry accusations hurled at each other during divorce proceedings.
Sky has brown eyes and black hair. He was last seen wearing a grey hooded sweatshirt, black and aqua blue sweat pants, and white socks. The toddler was 2-feet, 10-inches tall and weighed 28 pounds.
Anyone with information regarding Sky should contact the Bellevue, Wash., Police Department at 425-452-6917 or the National Center for Missing & Exploited Children, 1-800-843-5678 (1-800-THE-LOST).
|Michelle Parker, Now 35|
Michelle Parker had a moment in the spotlight when she appeared on the "Peoples' Court" TV show on Nov. 17, 2012 along with her ex-fiance, Dale Smith, in a dispute over a $5,000 engagement ring.
Hours later, she dropped off their twins at Smith's Orlando, Fla., home and she hasn't been seen since. She would have turned 35 on Jan. 20, 2012.
On Jan. 21, 2012, police released never-before-seen footage of Parker picking up food at a drive-thru window hours before she was last seen. Parker's cell phone was discovered at the bottom of a lake near Smith's house, prompting fears by Parker's family that foul play was involved in her disappearance.
Orlando Police Department said Jan. 29, 2013, that it is still an active case, but no arrests have been made.
Anyone with information regarding Parker's whereabouts has been asked to contact the Central Florida Crimeline: 1-800-423-TIPS.
|Amy Ahonen, Now 39|
Amy Ahonen was last seen on July 8, 2011 in Denver -- the day before her 38th birthday.
Her car was found on the side of Highway 6 in Jefferson County, Colo., with her belongings in it, including the keys in the console, her purse under the seat and her hiking backpack in the vehicle. The car was left unlocked.
Andrea Ahonen said her sister had an frightening experience with a man several months before she disappeared when she used Craigslist to advertise for a roommate, and she has told police about it.
Hoping to save some money, Amy Ahonen posted an ad on Craigslist looking for a roommate. In March 2011, a man who responded came to look at the place and "tried to kiss her," according to her sister.
But the Denver police told ABC News Jan. 29, 2013, that they do suspect foul play in the case of Ahonen's disappearance. No arrests have been made and the investigation remains open and active.
Ahonen was 5-foot-4 and had a slender build, light blonde hair and blue-green eyes.
Anyone with information regarding her whereabouts should call the Denver police at 720-913-2000 or visit the department's website.
|Aliayah Lunsford, Now 4|
The search continues for Aliayah Lunsford, who disappeared from her Bendale, W.Va., home Sept. 24, 2011.
Lewis County police said no suspects have been named in the case, but the criminal investigation into the little girl's disappearance isn't over.
Aliayah was last seen when her mother checked on her around 6:30 a.m., but was gone by 9:30 a.m., according to ABC News affiliate WDTV. She was last seen wearing purple "Dora the Explorer" pajamas.
The Lewis County Sheriff's Department is asking anyone with information to please call (304) 269-8251.
|Holly Bobo, Now 22|
Nursing student Holly Bobo has been missing since April 13, 2011, when a man in camouflage allegedly marched her into the woods near her home in rural Decatur County, about three hours from Nashville, Tenn.
Her brother Clint saw her go into the woods but mistakenly believed the man was her boyfriend. Police launched new searches last summer but have no suspects in her disappearance.
Thurstle Mullen, a Memphis nurse, and his wife told the Jackson Sun on Jan. 13, 2013, that he is offering a $100,000 reward for Bobo's abductor to turn himself in. He said he got permission from Bobo's family to post the reward.
The Tennessee Bureau of Investigation told ABC News Jan. 29, 2013, that the reward was up to $180,000.
Bobo has blond hair and blue eyes. She was last seen wearing a pink shirt and light-blue jeans. She would be 22.
The Tennessee Bureau of Investigation still considers Bobo's case open. It is asking anyone who might have any information about the case to please call the TBI Tips Hotline: (800) 824-3463.
|Susan Powell, 38|
The 38-year-old mother has been missing from her West Valley City, Utah, home since Dec. 7, 2009, the day after her husband, Josh Powell, loaded up the couple's two young sons for a late-night camping trip.
Josh Powell, the sole person of interest in his wife's disappearance, killed himself and his two sons, Charles, 7, and Braden, 5, in a fiery explosion on Feb. 5, 2012.
Josh Powell repeatedly said he wanted his wife to come home and didn't know what happened to her, but prosecutors continued to allege he was involved in Susan Powell's disappearance.
If you have any information about Susan Powell, contact West Valley City Police at (801) 840-4000.
|Brittanee Drexel, Now 21|
Police are still combing for clues in the case of the New York teenager who disappeared April 25, 2009, while on a spring break trip.
Drexel, then 17, was last seen in Myrtle Beach, S.C., where she had traveled from her home in Rochester, N.Y., against her mother's wishes. Since then, no arrests have been made in connection with her disappearance.
Myrtle Beach police searched an apartment complex in Georgetown, S.C., in August, following up on a tip for a person of interest, reported a local newspaper, the Post and Courier.
Last seen leaving the BlueWater Resort, Drexel was captured on surveillance video visiting a group of Rochester-area men after having a falling out with the friends she'd originally accompanied to the popular spring-break destination.
Drexel has blue eyes and brown hair. Both her ears and her nose are pierced.
Myrtle Beach police are asking anyone with any information to please call the department at 843-918-1963 or the CUE Center for Missing Persons 24-Hour Tip Line: (910) 232-1687.
|Asha Degree, Now 22|
It's been more than a decade since Asha Degree's family has heard from or seen its daughter.
The North Carolina girl disappeared on Valentine's Day in 2000, when she was 9 years old. She would be 22.
Her father last saw her asleep in bed at 2:30 a.m., on Feb. 14, 2000. Then, a motorist claimed to have spotted her walking down North Carolina Highway 18 in Shelby, at 4 a.m.
Police said they believe Asha simply packed her backpack and started off down the road in the middle of the night. Several motorists passed her, but no one stopped to check on her. Eighteen months later, Asha's book bag was found wrapped in trash bags 26 miles away.
CLICK HERE to see a picture of what Asha may look like today.
If you know anything about Asha's disappearance the Cleveland County Sheriff's Office asks you contact them at (704) 484-4822.
|Lindsey Baum, Now 14|
The disappearance of 10-year-old Lindsey Baum continues to affect her McClearly, Wash., community.
The sixth-grader disappeared the evening of June 26, 2009, as she walked home from a friend's house around 10 p.m. It was a 10-minute walk along a densely populated suburban street. She never made it home.
Lindsey has dark blond-brownish hair and brown eyes.
If you have any information about Lindsey Baum, contact the Grays Harbor County Information Hotline at (866) 915-8299 or the McCleary Police at (360) 495-3107.
|Sabrina Aisenberg, Now 15|
What happened to Sabrina Aisenberg, a 5-month-old who vanished from her crib at her home in Valrico, Fla., in 1997, is still a mystery.
Sabrina's mother, Marlene Aisenberg, told police at the time that she had last checked on the baby at midnight on Nov. 24, 1997, but when she returned to her daughter's room at 6:42 a.m., Sabrina was gone -- a detail eerily similarity to the Lisa Irwin case.
Investigators initially accused Marlene Aisenberg and her husband, Steve Aisenberg, of lying about their daughter's disappearance, and charged them with conspiracy and additional charges in 1999.
In 2001, a federal judge ruled that investigators had lied when they sought permission to place wiretaps in the Aisenberg home. The charges against the Aisenbergs were dismissed after tapes recorded from the wiretaps were ruled inaudible by a federal judge.
The Aisenbergs maintain they had nothing to do with their daughter's disappearance. To this day, Sabrina has never been found.
Sabrina had brown hair and blue eyes as an infant.
The Hillsborough County Sheriff's Office is asking anyone with information about Sabrina to please call 813-247-8200.
For more information on people missing in America or to offer tips, contact the National Center for Missing and Exploited Children or the Federal Bureau of Investigations.