<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (March 2015) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (March 2015) (Learn how and when to remove this template message) </Td> </Tr> <Table> North America <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Area </Th> <Td> 24,709,000 km (9,540,000 sq mi) (3rd) </Td> </Tr> <Tr> <Th> Population </Th> <Td> 579,024,000 (2016, 4th) </Td> </Tr> <Tr> <Th> Population density </Th> <Td> 22.9 / km (59.3 / sq mi) </Td> </Tr> <Tr> <Th> GDP (nominal) </Th> <Td> $21.2 trillion (2016, 2nd) </Td> </Tr> <Tr> <Th> GDP (PPP) </Th> <Td> $24.4 trillion (2016, 3rd) </Td> </Tr> <Tr> <Th> GDP per capita </Th> <Td> $41,830 (2016, 1st) </Td> </Tr> <Tr> <Th> Demonym </Th> <Td> North American </Td> </Tr> <Tr> <Th> Countries </Th> <Td> 23 sovereign states </Td> </Tr> <Tr> <Th> Dependencies </Th> <Td> 23 non-sovereign territories </Td> </Tr> <Tr> <Th> Largest cities </Th> <Td> List of urban areas: <Ul> <Li> New York City </Li> <Li> Mexico City </Li> <Li> Los Angeles </Li> <Li> Chicago </Li> <Li> Boston </Li> <Li> Toronto </Li> <Li> Dallas--Fort Worth </Li> <Li> San Francisco </Li> <Li> Houston </Li> <Li> Miami </Li> <Li> Philadelphia </Li> </Ul> </Td> </Tr> </Table> <Tr> <Th> Area </Th> <Td> 24,709,000 km (9,540,000 sq mi) (3rd) </Td> </Tr>

How many countries are there in northern america