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Population & demographics
All demographic data for Siziano: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for Siziano.
Environment & air quality
Air quality (PM2.5, PM10, NO2) and land consumption data for Siziano.
Siziano is a medium-sized municipality in the province of Pavia, Lombardia region. With a population of 6921 inhabitants and a density of 587 per km², it covers an area of 11,8 km². The average declared income is 28.537 €.
Siziano in numbers: the analysis
Looking ahead to 2050, projections give Siziano about 10,701 inhabitants, up 54.6% from today.
The average municipality in the province of Pavia has about 2,951 residents: Siziano has 2.3 times as many.
By population, Siziano ranks no. 10 among the 185 municipalities of the province of Pavia.
Siziano has grown substantially since 1951: from 2,290 inhabitants then to 6,921 in 2026, an increase of 202.2%.
The generational balance is in line with the norm: the ageing index of Siziano is 145 (over-65s per 100 under-14s).
Population Trend
Male/Female Ratio
Demographic Statistics
Demographic Indices
Births (recent years)
Historical Population (1951-present)
Marital Status (2025)
School-Age Population (2026)
Total 0-18 years: 1269
Foreign residents
Foreign presence and top citizenships
Embed this chart
Use the Siziano population pyramid on your site or article — the DatiItalia source link is already included.
<a href="https://datitalia.eu/comune/siziano-018150" title="Population pyramid of Siziano — DatiItalia"><img src="https://datitalia.eu/render/chart/piramide/siziano-018150" alt="Population pyramid of Siziano — DatiItalia" width="600" style="max-width:100%;height:auto;border:0" loading="lazy" /></a>