When someone goes missing, a lot of invisible paperwork begins. A report is taken, a description is written down, a record is created, and, if the person is not found, that record may sit in one or more national systems for years. Most people have heard of a few of them: an Amber Alert, a poster, a database with a long name. Fewer know how they fit together.
This article explains the main U.S. systems that track missing and unidentified people, who is responsible for each, and what the official numbers can and cannot tell you. It describes how things work in general and relies on official government sources; individual agencies and states vary.
If someone you know is missing right now, contact your local law enforcement agency immediately. This article is background reading, not an emergency guide.
The short version
| System | Run by | What it holds | Who can use it |
|---|---|---|---|
| NCIC Missing Person File | FBI | Records of missing people entered by law enforcement | Law enforcement and authorized agencies |
| NamUs | National Institute of Justice (NIJ) | Missing, unidentified and unclaimed persons cases | Professionals, plus a limited public view and public accounts |
| NCMEC | The National Center for Missing & Exploited Children, which works with law enforcement | Missing and exploited children cases | Families and law enforcement through its hotline |
| CODIS (national DNA index) | FBI | DNA profiles, including missing persons, relatives of missing persons and unidentified persons | Participating forensic laboratories |
None of these replaces the others. They overlap, and a case can appear in all four.
Step one: a report to the police
Everything starts with a report to a law enforcement agency. For a missing child, the National Center for Missing & Exploited Children (NCMEC) advises families to call local law enforcement first, give the child's name, date of birth, height, weight and other identifying details, say when the child was last seen and what they were wearing, and ask that the information be entered into the FBI's National Crime Information Center (NCIC) Missing Person File. Only after that does it suggest calling NCMEC's 24-hour hotline, 1-800-843-5678.
The entry into NCIC is the key step. Records in NCIC can be searched by authorized law enforcement agencies, so the report is no longer limited to the department that took it.
NCIC: the national police record
According to the FBI, the NCIC Missing Person File was implemented in 1975. Records stay in it indefinitely, until the person is located or the entering agency cancels the record.
The file sorts records into categories. They include people of any age who are missing and disabled, endangered or missing under circumstances suggesting the disappearance may not have been voluntary (such as an abduction), juveniles, victims of a catastrophe, and an "other" category for people who are missing and for whom there is a reasonable concern for their safety.
Who must be entered
Federal law makes entry mandatory for some people. Under 34 U.S.C. § 41307(a), each federal, state and local law enforcement agency must report every case of a missing child under the age of 21 to NCIC. The FBI notes that Suzanne's Law, passed in 2003, raised the age for mandatory entry from under 18 to under 21. The same provision also requires agencies to report such cases to NamUs, consistent with the rules in section 40507 of the same title. For adults, the FBI's categories describe the circumstances (such as endangerment or reasonable concern for safety) under which a record is entered.
What the numbers show
The FBI publishes yearly statistics. For 2024:
- 93,447 missing-person records were active at the end of the year.
- 533,936 records were entered during the year, and 537,446 were removed. The FBI lists reasons such as a law enforcement agency locating the person, the person returning home, or the record being found invalid.
- Of the active records, 25,493 (27 percent) concerned people under 18, and 34,256 (37 percent) concerned people under 21.
These figures show something important about the scale and the shape of the problem: far more records are entered in a year than remain active. NamUs notes that many missing children and adults are found quickly, alive and well. The active count is a snapshot, not a total of all disappearances.
A note on the type of case. The "circumstances" field in NCIC is optional, and it was filled in for 48 percent of the 2024 entries. Among those, 95 percent were coded as runaways, and 0.1 percent (293 records) as abducted by a stranger. That does not mean the other half had no circumstances; it means they were not recorded in that field. Be careful about drawing conclusions from partial data.
NamUs: the national case clearinghouse
The National Missing and Unidentified Persons System (NamUs) is a different kind of tool. NIJ describes it as a central database and support program for law enforcement, medical examiners, coroners, investigators and families, aimed at resolving missing, unclaimed and unidentified persons cases. NamUs is administered by the Office of Justice Programs' NIJ.
Its history, according to NamUs:
- 2005: the "Identifying the Missing Summit" brought together practitioners and policymakers to define the problem.
- 2007: the Unidentified Persons database launched.
- 2008: the Missing Persons database launched.
- 2009: the two were connected for automatic case comparisons, so that a record of a missing person can be compared with a record of an unidentified one.
- 2018: the redesigned NamUs 2.0 was released.
The program is backed by federal law: according to NamUs, Billy's Law directs the Attorney General to maintain NamUs as a national information clearinghouse and resource center for missing, unidentified and unclaimed person cases.
What makes NamUs unusual
NIJ calls NamUs the only national database for missing, unidentified and unclaimed persons that allows limited access to the public. Public users, which include family members, volunteers and advocacy-group staff, can enter new missing-person cases, track cases and search the publicly visible information. All public entries are checked with the appropriate investigating agency before they become publicly viewable. Professional users, such as law enforcement and medical examiners, can see more, including dental records and fingerprint cards.
NamUs also provides free services to agencies: investigative support and cold case advisors, plus forensic work such as DNA analysis, forensic anthropology, fingerprint assistance, odontology, and, for medicolegal offices, investigative genetic genealogy.
What NamUs does not show
NIJ is open about the limits. Today, 17 states require law enforcement to enter information into NamUs. Elsewhere, entry is voluntary. NIJ states that the cases in NamUs "do not necessarily reflect all missing, unidentified, and unclaimed persons cases across the United States or in any one state or jurisdiction." So the public NamUs search is a useful window, not a complete register.
A 2022 law also directed the Attorney General to plan the automatic transmission of NCIC missing and unidentified person records to NamUs on a set schedule: for example, endangered or involuntary missing-person cases within 30 days, other missing-person cases after 180 days, and unidentified-person cases after 60 days. We could not confirm from the sources we used how far that plan has been put into practice.
NCMEC: the center for missing children
NCMEC works alongside law enforcement. When a family calls the hotline, a specialist records information about the child, and a case management team works with the family and the investigating agency. NCMEC lists services such as creating and distributing posters, reviewing and passing on leads to the investigating agency, and peer support from trained volunteers who have experienced a missing-child case in their own families.
DNA: the layer that finds matches
Some cases cannot be solved by description alone. For these, DNA is the third layer. The FBI's national DNA index (NDIS, part of CODIS) accepts DNA records in several categories, and three of them are tied to the missing: missing persons, relatives of missing persons and unidentified persons. Relatives provide reference samples, which can later be matched with the DNA of unidentified remains. NIJ's NamUs page says families can help by working with NamUs staff and law enforcement to provide DNA samples from themselves and from items belonging to the missing person.
The other half: unidentified people
Tracking missing people also means tracking those who cannot be named. The NCIC Unidentified Person File came online in 1983 and holds records of deceased people whose identity is unknown, living people who cannot establish their identity (for instance, some people with amnesia or infants) and catastrophe victims. The FBI says use of the file is voluntary. At the end of 2024 it held 8,546 records; 861 were entered during the year and 837 were removed, for reasons such as the person being identified or the record being invalid.
NamUs estimates that about 4,400 unidentified bodies are recovered each year in the U.S., with about 1,000 of them still unidentified after a year. It cites a 2004 Bureau of Justice Statistics study for that estimate, so treat it as an approximation.
Why the systems don't line up perfectly
If you compare numbers across these systems, they won't match, and that is expected:
- Different jobs. NCIC is a working record for police, and records are removed when a person is found. NamUs focuses on long-term cases.
- Different entry rules. Entry into NCIC is mandatory for people under 21 but depends on circumstances for adults, and entry into the Unidentified Person File and, in most states, into NamUs is voluntary.
- Different definitions. "Missing," "runaway," "endangered" and "unclaimed" mean different things in different categories.
- Time. An NCIC figure for one year counts records entered that year, including many that are closed within days.
The practical lesson: no single number is "the" number of missing people in the U.S. Treat any single figure with caution, including those in this article.
Communities where the data has gaps
NIJ acknowledges that many missing-persons databases do not contain records of all American Indian and Alaska Native people who have gone missing, which can mean the services needed to investigate those cases are lacking. It describes NamUs as one way to narrow that gap, and says the NamUs database includes fields specific to American Indian and Alaska Native people and that its staff includes a tribal liaison. The extent of the gaps varies, and we point to NIJ's description rather than a number.
What families can do
Based on what NIJ and NCMEC publish, the usual steps are:
- Report to law enforcement and ask that the person be entered into NCIC.
- For a child, call NCMEC after reporting to the police: 1-800-843-5678.
- Register as a public user on NamUs (NIJ says family members may do so) and enter the case; it is checked with the investigating agency before it appears publicly.
- Offer reference DNA through law enforcement or NamUs staff if asked.
- Keep in contact with the investigating agency.
Myths and facts
| Myth | Fact |
|---|---|
| There is a single national list of every missing person. | There are several systems with different rules, and NIJ says NamUs does not reflect all cases. |
| Anyone can search every detail of every case. | The public NamUs view is limited; sensitive details such as dental records and fingerprint cards are for professional users. |
| Missing-person records stay open for years. | Many are closed quickly: in NCIC in 2024, 537,446 records were removed and 533,936 were entered. Some cases do remain open for years. |
| Entering a case into NamUs replaces a police report. | A police report is the starting point. NamUs public entries are vetted with the investigating agency. |
| Missing adults are never entered in NCIC. | The file includes categories for adults, such as endangered or involuntary disappearances. Entry depends on the circumstances. |
Frequently asked questions
What is NamUs?
The National Missing and Unidentified Persons System, a federal database and support program run by the National Institute of Justice. It has records of missing, unidentified and unclaimed persons, and it offers free forensic and investigative services to agencies.
Can I search NamUs?
Yes. The public can search the information that is publicly visible. Registered public users can also enter cases and track them.
Is NamUs the same as NCIC?
No. NCIC is the FBI's database for law enforcement; NamUs is run by NIJ, has a public side, and focuses on resolving long-term cases. A 2022 law directs the Attorney General to plan data sharing between the two.
How many people go missing each year?
NamUs says over 600,000, citing FBI data on records entered into NCIC (an average of 664,776 per year between 2007 and 2020). NamUs's own note describes this as a count of records entered, not of individual people, and many people are found quickly.
Does a missing-person case ever close?
Yes, when the person is found or identified. In NCIC, records stay on file until the person is located or the entering agency cancels them.
Where the app fits in
The Missing Persons collection in the True Crime Coloring Book app is built around the quiet side of this subject: maps, last sightings and unanswered calls, drawn as line art for you to color. It is illustrative, with no real people, and it is meant to be calm rather than sensational.
Sources
- National Institute of Justice, National Missing and Unidentified Persons System: what NamUs is, the 17 states that require entry, public access, vetting of public entries, free services, DNA from families, and the tribal resources.
- NamUs, About: history and milestones, Billy's Law, and the figures on missing persons and unidentified bodies (with its cited notes).
- National Institute of Justice, NamUs Fiscal Year 2024 Annual Report (abstract).
- Federal Bureau of Investigation, 2024 NCIC Missing and Unidentified Person Statistics, March 2025: the Missing Person and Unidentified Person Files, categories and 2024 counts.
- Legal Information Institute, 34 U.S. Code § 41307 (reporting requirement for missing children) and 34 U.S. Code § 40507 (information sharing between NCIC and NamUs).
- National Center for Missing & Exploited Children, Is Your Child Missing?: what to do and how NCMEC helps.
- Federal Bureau of Investigation, Privacy Impact Assessment for the National DNA Index System, 2022: the categories of DNA records accepted into NDIS.
