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The news confirms expectations that the confectionery market will continue to grow in 2014 and beyond.
The manufacturer opened the $270 million facility in Kansas in the United States.
Located south of Topeka, the new site has capacity for producing 39 million M&Ms every day - enough to fill 1.5 million fun-sized packs.
The plant will employ more 200 people, and the company has contributed $200,000 to redevelopment efforts in the area.
The 500,000 square-foot facility is pursuing a gold certification for environmental sustainability from the non-profit US Green Building Council.
“We have been growing, and we see future growth,” said the company, adding that "we need the capacity".
A US industry analyst said confectionery companies can expect the annual growth in chocolate sales to stay above 3% into the future.
The family-owned Mars Inc reports annual net sales of $33 billion.
The company has more than 72,000 employees in 74 countries.