Colombia will enforce an obligatory lockdown on Tuesday and New Zealand will follow suit Wednesday.
In most cases it is still possible to leave the house to go to work, buy essentials or seek medical care.
At least four countries with a collective population of more than 228 million people, including Iran, Germany and Britain, have urged their populations to stay indoors and limit contact with other people as much as possible.
But the impact of these non-mandatory recommendations has been limited.
In Britain, the government warned of tougher measures after crowds gathered in parks and beaches over the weekend, while millions of people in Iran travelled for the Persian New Year last week.
At least 10 countries and territories with a total population of 117 million people have issued curfews and barred overnight travel.
These measures are in place in Burkina Faso, Chile, the Philippines' capital Manila, Serbia and Mauritania, while in Saudi Arabia a curfew will be imposed from Monday evening.
Elsewhere, some countries have imposed isolation measures in main cities, with measures barring people from entering or exiting.
These measures have been seen in Almaty, Bulgaria, Nur-Sultan in Kazakhstan and Azerbaijan's Baku.
Combined, these cities have an estimated 10 million inhabitants.
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