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Population & demographics
All demographic data for Sondrio: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for Sondrio.
Environment & air quality
Air quality (PM2.5, PM10, NO2) and land consumption data for Sondrio.
Sondrio is a medium-sized municipality in the province of Sondrio, Lombardia region. With a population of 21.495 inhabitants and a density of 1029 per km², it covers an area of 20.9 km². The average declared income is 28.442 €.
Sondrio in numbers: the analysis
Few municipalities in Lombardia are larger: it ranks no. 64 by population out of 1502.
Sondrio is the most populous municipality in the province of Sondrio, out of 77 in total.
Sondrio has grown substantially since 1951: from 14,643 inhabitants then to 21,495 in 2026, an increase of 46.8%.
The ageing index is one of the starkest signals: in Sondrio there are 263 residents over 65 for every 100 under 14, well above the national average.
For 2050 the projections point to an essentially unchanged population: about 21,176 inhabitants.
The average municipality in the province of Sondrio has about 2,328 residents: Sondrio has 9.2 times as many.
Population Trend
| Anno | Popolazione |
|---|---|
| 2019 | 21.589 |
| 2020 | 21.477 |
| 2021 | 21.202 |
| 2022 | 21.192 |
| 2023 | 21.130 |
| 2024 | 21.297 |
| 2025 | 21.331 |
| 2026 | 21.495 |
Male/Female Ratio
| Valore | % | |
|---|---|---|
| Men | 10.222 | 47.6% |
| Women | 11.273 | 52.4% |
Demographic Statistics
Demographic Indices
Births (recent years)
| Valore | |
|---|---|
| 2021 | 135 |
| 2022 | 136 |
| 2023 | 122 |
| 2024 | 116 |
| 2025 | 132 |
Historical Population (1951-present)
| Anno | Population |
|---|---|
| 1951 | 14.643 |
| 1961 | 18.944 |
| 1971 | 22.990 |
| 1981 | 22.747 |
| 1991 | 22.097 |
| 2001 | 21.642 |
| 2011 | 21.642 |
| 2019 | 21.589 |
| 2020 | 21.477 |
| 2021 | 21.202 |
| 2022 | 21.192 |
| 2023 | 21.130 |
| 2024 | 21.297 |
| 2025 | 21.331 |
| 2026 | 21.495 |
Marital Status (2025)
| Valore | % | |
|---|---|---|
| Single | 18.878 | 44.3% |
| Married | 17.654 | 41.4% |
| Divorced | 2340 | 5.5% |
| Widowed | 3776 | 8.9% |
School-Age Population (2026)
Total 0-18 years: 3100
| Valore | |
|---|---|
| Nido (0-2) | 387 |
| Infanzia (3-5) | 418 |
| Primaria (6-10) | 811 |
| Medie (11-13) | 553 |
| Superiori (14-18) | 931 |
Foreign residents
Foreign presence and top citizenships