View source for Olbia

== Demographics ==
{{Historical populations|1861|3042|1871|3393|1881|4073|1901|5487|1911|7123|1921|8045|1931|10860|1936|11377|1951|14601|1961|17727|1971|24290|1981|30787|1991|41095|2001|45366|2011|53307|2021|60711|cols=1|align=right|source=[[National Institute of Statistics (Italy)|ISTAT]]<ref>{{cite web |title=Popolazione residente dei comuni. Censimenti dal 1861 al 1991|trans-title=Resident population of the municipalities. Censuses from 1861 to 1991|url=https://ebiblio.istat.it/digibib/Censimenti%20popolazione/Censimentipopolazioneresidentedal1861/RML0050288Pop_res_cens_1861_1991.pdf|url-status=dead |archive-url=https://web.archive.org/web/20251112200324/https://ebiblio.istat.it/digibib/Censimenti%20popolazione/Censimentipopolazioneresidentedal1861/RML0050288Pop_res_cens_1861_1991.pdf |archive-date=2025-11-12|lang=it|publisher=[[National Institute of Statistics (Italy)|ISTAT]]}}</ref><ref name="timeseries">{{cite web |title=Resident population - Time series|url=https://esploradati.istat.it/databrowser/#/en/censpop/dashboards|publisher=[[National Institute of Statistics (Italy)|ISTAT]]}}</ref>}}

As of 2026, the population is 61,739, of which 49.5% are male, and 50.5% are female. Minors make up 14.8% of the population, and seniors make up 20.6%.<ref>{{Cite web |date=2026-01-01 |title= Resident population by age, sex and marital status on 1st January 2026 |url=https://demo.istat.it/app/?i=POS&l=en |website=demo.istat.it |publisher=[[Italian National Institute of Statistics|ISTAT]] |access-date=2026-04-01}} (On the search form, choose the statistical region of the municipality in the Area section, the Region, the Province, and the name of the Municipality)</ref><ref>{{Cite web |date=2026-01-01 |title= Resident population by age, sex and marital status on 1st January 2026 |url= https://demo.istat.it/data/posas/POSAS_2026_en_All_files.zip |website=demo.istat.it |publisher=[[Italian National Institute of Statistics|ISTAT]] |access-date=2026-04-01}}The file URL linking on technical dataset.</ref>

=== Immigration ===
As of 2025, of the known countries of birth of 60,828 residents, the most numerous are: [[Italy]] (54,271 – 89.2%), [[Romania]] (2,023 – 3.3%), [[Senegal]] (456 – 0.7%), [[Argentina]] (394 – 0.6%), [[Morocco]] (379 – 0.6%).<ref>{{Cite web |date=2025-01-01 |title= Resident population by sex, municipality and individual citizenship or country of birth from year 2002 |url=https://demo.istat.it/app/?i=RCS&a=&l=en |website=demo.istat.it |publisher=[[Italian National Institute of Statistics|ISTAT]] |access-date=2025-02-27}} (Click on 'View by country of birth', and on the search form, choose the statistical region of the municipality in the Area section, the Region, the Province, and the name of the Municipality)</ref><ref>{{Cite web |date=2025-01-01 |title= Resident population by sex, municipality and individual citizenship or country of birth from year 2002 |url= https://demo.istat.it/data/rcs/Dati_RCS_nascita_2025.zip |website=demo.istat.it |publisher=[[Italian National Institute of Statistics|ISTAT]] |access-date=2025-02-27}}The file URL linking on technical dataset.</ref>
{| class="wikitable floatright"
|+Foreign population by country of birth (2025)
!Country of birth
!Population
|-
|{{flag|Romania}}
|2,023
|-
|{{flag|Senegal}}
|456
|-
|{{flag|Argentina}}
|394
|-
|{{flag|Morocco}}
|379
|-
|{{flag|Germany}}
|323
|-
|{{flag|France}}
|313
|-
|{{flag|Albania}}
|304
|-
|{{flag|Poland}}
|264
|-
|{{flag|Ukraine}}
|243
|-
|{{flag|Pakistan}}
|220
|-
|{{flag|Switzerland}}
|185
|-
|{{flag|Brazil}}
|146
|-
|{{flag|China}}
|142
|-
|{{flag|Egypt}}
|126
|-
|{{flag|Belgium}}
|123
|}