IN the span of two weeks, nearly 30 children have vanished in Cleveland, sparking concern from a local police chief who said he hasn't seen anything like this in his 33-year career.

As many as 27 children have been reported missing in the greater Cleveland area, according to Newburgh Heights police chief John Majoy.

https://www.the-sun.com/news/8270566/cleveland-ohio-children-missing-police-chief-speaks-out/

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As pointed out below the mentioned statistics are only the tip of the iceberg, so I'd double them and then add a few (lot) more.
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Missing Children’s Statistics.

One Missing Child Is One Too Many.

The lack of a common definition of “missing child,” and a common response to the issue, results in few reliable statistics on the scope of the problem around the world.

Even with this challenge, we know that:

In Australia, an estimated 20,000 children are reported missing every year.
Australian Federal Police, National Coordination Centre.

In Canada, an estimated 45,288 children are reported missing each year.
Government of Canada, Canada’s Missing – 2015 Fast Fact Sheet.

In Germany, an estimated 100,000 children are reported missing each year.
Initiative Vermisste Kinder.

In India, an estimated 96,000 children go missing each year.
Bachpan Bachao Andolan, Missing Children of India.

In Jamaica, an estimated 1,984 children were reporting missing in 2015.
Jamaica’s Office of Children’s Registry

In Russia, an estimated 45,000 children were reported missing in 2015.
Interview with Pavel Astakhov MIA “Russia Today”, Apr. 4, 2016.

In Spain, an estimated 20,000 children are reported missing every year.
Spain Joins EU Hotline for Missing Children, Sep. 22, 2010.

In the United Kingdom, an estimated 112,853 children are reported missing every year.
National Crime Agency, UK Missing Persons Bureau.

In the United States, an estimated 460,000 children are reported missing every year.
Federal Bureau of Investigation, NCIC.

This, however, is only a snapshot of the problem. In many countries, statistics on missing children are not even available; and, unfortunately, even available statistics may be inaccurate due to: under-reporting/under-recognition; inflation; incorrect database entry of case information; and deletion of records once a case is closed.

https://globalmissingkids.org/awareness/missing-children-statistics/

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Child abductions and kidnappings are reported with alarmingly high frequency both in the U.S. and abroad. According to the National Incidence Studies of Missing, Abducted, Runaway, and Thrownaway Children (NISMART), approximately 2,300 children go missing every day in the United States.

Here are the most recent missing children statistics, missing persons statistics, and kidnapping statistics along with resources.

https://www.justgreatlawyers.com/legal-guides/missing-children-statistics

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Fox.