"We have the toll of the people who have unfortunately died," said President Juan Manuel Santos, as he revisited the scene of Friday's disaster.
"The latest is 273 people died and 262 are injured," he said. Earlier he said that at least 43 children were among the dead.
Santos was to spend the night at a nearby military base and today would continue coordinating the emergency response.
The president said reconstruction would begin, dismissing risks of further mudslides, but he warned that the country faces rainy weather until June.
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The mudslides occurred Friday after heavy rains caused three rivers to overflow, spewing earth, rocks and tree debris over the area.
Most of the hardest-hit neighborhoods are poor and populated with people uprooted during Colombia's five-decade-long civil war.
Mocoa was home to 70,000 people, according to Sorrel Aroca, the governor of Putumayo department. The Red Cross estimated about 45,000 people in Mocoa were affected by the mudslides.
Survivors told of scrambling onto roofs or hanging onto trees as a sea of mud, boulders and debris engulfed Mocoa late Friday.
Some watched as their children and relatives were swept away. Among them was Ercy Lopez, 39, who was left hanging on a tree after the deluge tore away her home.
Lying on a mattress in a shelter for survivors, she said people were still searching for her 22-year-old daughter Diana Vanesa.
"The hopes of finding her alive are slim now," she said.
Survivors gathered at the local hospital and at the cemetery to search for family members and friends.
Yulieth Rosero had just buried her sister, but was holding out hope of finding her seven-year-old nephew, Juan David Rueda.
"I found his little brother, William. He's alive. He's in shock, injured and has no clothes, but he's OK," said Rosero, 23.
Hundreds of rescuers were working at the scene of the disaster, using mechanical diggers in the search.
Locals said it was never safe to live so close to the three rivers that overflowed after days of torrential rain.
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