The death toll was expected to rise, the officials said.
Thousands had gathered at the Felix Houphouet Boigny Stadium in Abidjan's Plateau district to see the fireworks. After the show, the crowds poured onto the Boulevard de la Republic by the Hotel Tiama at about 1 a.m., said Col. Issa Sako of the fire department rescue team.
"The flood of people leaving the stadium became a stampede which led to the deaths of more than 60 and injured more than 200," Sako told Ivory Coast state TV.
Most of those killed were between 8 and 15 years old, he said.
Desperate parents went to the city morgue, the hospital and to the stadium to try to find children who are still missing.
Mamadou Sanogo was searching for his 9-year-old son, Sayed.
"I have just seen all the bodies, but I cannot find my son," said a tearful Sanogo. "I don't know what to do."
President Alassane Ouattara and his wife visited some of those hospitalized and he pledged that the government would pay for their treatment, his office said.
The government organized the fireworks to celebrate Ivory Coast's peace, after several months of political violence in early 2011 following disputed elections. It was the second year that Abidjan had a New Year's fireworks display.
Hours after the stampede, soldiers patrolled the site, where victims' clothes, shoes and other debris littered the street.
State TV showed traumatic scenes: a woman sobbed in the back of an ambulance; another was bent over on the side of the street, apparently in pain; and another, barely conscious and wearing only a bra on her upper body, was hoisted up by rescuers.
There were also scenes of small children being treated in a hospital; one boy grimaced in pain and a girl with colored braids in her hair lay under a blanket, with one hand bandaged.
This is not Ivory Coast's first stadium tragedy. In 2009, 22 people died and over 130 were injured in a stampede at a World Cup qualifying match at the Houphouet Boigny stadium, prompting FIFA, soccer's global governing body, to impose a fine of tens of thousands of dollars on Ivory Coast's soccer federation. The stadium, which officially holds 35,000, was overcrowded at the time of the disaster.
A year later, two people were killed and 30 wounded in a stampede at a municipal stadium during a reggae concert in Bouake, the country's second-largest city. The concert was organized in the city, held by rebels at the time, to promote peace and reconciliation.
Ivory Coast is the world's largest cocoa producer, growing more than 37 percent of the world's annual crop of cocoa beans, which are used to make chocolate.
This program aired on January 1, 2013. The audio for this program is not available.