From http://hagstofan.is/Hagtolur/Mannfjoldi, which is the population section of Hagstofa Íslands, which in practice roughly means the National Statistical Bureau of Iceland, although the name means the Economic Institute of Iceland - and they are indeed concerned the economy, but also the national register. That leads to this quote: "Í lok 4. ársfjórðungs 2014 bjuggu 329.040 manns á Íslandi ..." which means "At the end of the last quarter of 2014 Iceland had 329,040 inhabitants." Look up http://www.ethnologue.com/country/IS and you will find an an alleged population of 381,400. Look up http://www.ethnologue.com/language/isl and you will find the resident Icelandic speaking population given as 230,000 and the total for all countries as 243,840. The figure 230,000 seems to be a leftover from the sixties or seventies. There is a English version of the Statistical Bureau here: http://www.statice.is/ You can gather all the relevant information there, but the current figures you give are incredibly wrong, All the best
The speaker population figure given for Icelandic [isl] in Iceland dates from 1980. This figure will be updated for the 18th edition.