If you've eaten M&M's chances are they came from Cleveland TN
If you've eaten Peanut Butter M&M's they absolutely came from here
The Mars Wrigley factory in Cleveland, Tennessee, is one of two M&M's production facilities in the United States, the other being in Hackettstown, New Jersey. The Cleveland plant is described as the largest M&M plant globally and produces the widest variety of M&M's flavors. It is also the exclusive manufacturing location for peanut butter M&M's and has been the sole producer for new flavors, such as hazelnut spread M&M's.
In 2021, the Cleveland chocolate factory reported producing 300 million M&M's daily, which translates to 40 truckloads of M&M's each day from this single factory. If the Hackettstown factory were to produce the same quantity, the total daily production in the U.S. would be close to 600 million M&M's. The Mars Corporation's largest production facility is located in Cleveland, Tennessee, contributing to a sweet scent of chocolate in the air of the city.