Readout of First Lady Melania Trump’s Visit to Huntington, West Virginia

https://www.whitehouse.gov/briefings-statements/readout-first-lady-melania-trumps-visit-huntington-west-virginia/

Prior to departing West Virginia, the First Lady made an off-the-record stop at Ritter Park. Mrs. Trump visited a portion of the park to pay respect and view the hundreds of flags lining the field, which are symbolic of children who are currently in the foster care system as a direct result of the opioid epidemic.

The Epoch Times, specifically states in caption, 453 flags.

https://www.theepochtimes.com/melania-trump-wears-gorgeous-denim-shirt-dress-to-join-discussions-on-opioid-epidemic_2994046.html