Oiartzualdea

thumb|Map of Oiartzualdea Oiartzualdea in Basque (Oarsoaldea in Spanish) is a subcomarca of Donostialdea in Gipuzkoa, formed by four municipalities, Errenteria being the main town.

==Municipalities== {| class="wikitable sortable" |- ! BasqueName(Official) ! SpanishName ! Population2001 Census ! Population2011 Census ! Population2018 Estimate |- |Errenteria || Rentería || align="right" | 38,224 || align="right" | 39,228 || align="right" | 39,355 |- |Lezo || || align="right" | 5,834 || align="right" | 6,011 || align="right" | 6,045 |- |Oiartzun || Oyarzun || align="right" | 9,179 || align="right" | 10,012 || align="right" | 10,276 |- |Pasaia || Pasajes || align="right" | 15,962 || align="right" | 15,727 || align="right" | 16,128 |- |Totals || || align="right" | 69,199 || align="right" | 70,978 || align="right" | 71,804 |}