There are over 3,500 species of roaches currently believed to be living on earth today. Of these only 57 species reside within the US and only 20 or so species are equipped to live in manmade environments, that's less then 2% of all roaches.
There are no studies that discuss which country has the most amount of cockroaches. Some believe under-developed countries have the most.
they originally come from puerto rico
USA
Ireland
Norway
china
IndoNesia
Africa
Japan
eritrea
yarnland
Originally, Ireland.
The country that Saint Patrick originally came from was Roman Britain, probably Scotland.