how to define town and country in your country?

Town is a human settlement that is generally larger than villages and smaller than cities. Country is a district part of the world, a nation with its own government. Country intended as "the country side of a town" is another matter. It is a small settlements outside large urban areas. What you read about U.S. is NOT correct, in Louisiana a town has a population of less than 4,999, so it depends which US state.