While many praise the mission's success in stabilizing the country after years of conflict and post-electoral violence, others point to a recent series of army mutinies as a sign that peace remains tentative.
"The departure of UNOCI shows the remarkable progress that has been accomplished in Ivory Coast on the path to peace, lasting stability and economic prosperity," said Aichatou Mindaoudou, the UN secretary-general's special representative for the country.
A peace deal in 2007 ultimately brought key rebel leaders into the administration, but deep divisions remained.
The country again came close to civil war in 2011 when then-leader Laurent Gbagbo refused to concede defeat after losing the election and some 3,000 people were killed in the violence that followed.
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Current President Alassane Ouattara was later installed with the help of his former rebel allies and the international community.
Some 6,900 uniformed personnel were authorized under the original U.N. Resolution authorizing the peacekeeping mission, but that number had fallen to roughly 2,600 at the end of last year.
For many Ivorians, the departure of the peacekeepers is a positive sign even as worries flare about the recent military tensions. Many recall it was only six years ago that post- electoral conflict claimed so many lives.
"The UN mission should stay in place a few more years during the process of reconciliation and restructuring the army," said Firmin Kouakou, a student in the financial capital, Abidjan.
Gbagbo, the former president, is still awaiting trial on war crimes charges at The Hague along with his ally Charles Ble Goude, and critics have accused Ouattara's administration of prioritizing the human rights abuses perpetrated on his supporters.
While the last election in 2015 was peaceful and saw the incumbent re-elected, Ouattara is constitutionally barred from running again. Observers say that vacuum could create more uncertainty about the country's political future.
Disgruntled soldiers have launched a series of mutinies in recent months, paralyzing commerce and raising concerns about further unrest.
Authorities have said they are investigating.
Human rights groups are urging the government to do more as the UN mission departs.
"The vast majority of the commanders and leaders implicated in a decade of serious human rights violations - on both sides of the military-political divide - have not been held to account," said a statement released today by Human Rights Watch and others.
Drissa Traore, the vice president of the International Federation for Human Rights, said that "it's too early to say whether the recovery is sustainable."
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