ST. JOSEPH, Missouri (Reuters) - On a sunny November afternoon in this historic city, birthplace of the Pony Express and death spot of Jesse James, Lauranda Mignery watched her son Kadin, 2, dig in their front yard. As he played, she scolded him for putting his fingers in his mouth.

In explanation, she pointed to the peeling paint on her old house. Kadin, she said, has been diagnosed with lead poisoning.

He has lots of company: Within 15 blocks of his house, at least 120 small children have been poisoned since 2010, making the neighborhood among the most toxic in Missouri, Reuters found as part of an analysis of childhood lead testing results across the country. In St. Joseph, even a local pediatrician’s children were poisoned.

Last year, the city of Flint, Michigan, burst into the world spotlight after its children were exposed to lead in drinking water and some were poisoned. In the year after Flint switched to corrosive river water that leached lead from old pipes, 5 percent of the children screened there had high blood lead levels.

Flint is no aberration. In fact, it doesn’t even rank among the most dangerous lead hotspots in America.

In all, Reuters found nearly 3,000 areas with recently recorded lead poisoning rates at least double those in Flint during the peak of that city’s contamination crisis. And more than 1,100 of these communities had a rate of elevated blood tests at least four times higher.

The poisoned places on this map stretch from Warren, Pennsylvania, a town on the Allegheny River where 36 percent of children tested had high lead levels, to a zip code on Goat Island, Texas, where a quarter of tests showed poisoning. In some pockets of Baltimore, Cleveland and Philadelphia, where lead poisoning has spanned generations, the rate of elevated tests over the last decade was 40-50 percent.