Simplify the following text for a Grade 9 native English-speaking person.
Original: The 2006 Census confirmed Dundalk and Drogheda as not only the largest towns in the county , but also the second and third largest towns in The Republic of Ireland .
Simplified: The 2006 Census showed that Dundalk and Drogheda as not only the largest towns in the Louth , but also the second and third largest towns in Ireland .