Last Sunday, 16 January 2011, Oslo inhabitant no. 600.000 was born at Oslo University Hospital (dep. Rikshospitalet/The National Hospital). The mayor of Oslo, Fabian Stang, marked the happy occasion by visiting the newborn baby girl, Stella, and her parents at the hospital. The baby was given a gold jewel with Saint Hallvard - the patron saint of Oslo - engraved, while her parents, Miriam Nordgård and Lars Olav Vartdal, received flowers.
The population growth is first of all caused by a surplus in births and immigration. The last estimates I have read say that the population will have passed 768.000 in 2030.
As of 1 October 2010 the population of Norway was 4.908.100.