El Salvador is using the lightning network to facilitate transactions for the most part. They are using the work of Strike & bitcoin beach in El Salvador as an example.
The country has a population of >6 million.
Bitcoin beach is a philanthropy run by one adult coordinator, 4 university students and 4 high school students.
The country is not using the lightning network. Maybe some have intentions for them to. But this is not something widely used by any means.