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Population & demographics
All demographic data for San Gemini: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for San Gemini.
Environment & air quality
Air quality (PM2.5, PM10, NO2) and land consumption data for San Gemini.
San Gemini is a small municipality in the province of Terni, Umbria region. With a population of 4611 inhabitants and a density of 169 per km², it covers an area of 27.3 km². The average declared income is 24.173 €.
San Gemini in numbers: the analysis
Among the 33 municipalities of the province of Terni, San Gemini ranks 6 by population.
San Gemini has grown substantially since 1951: from 3,460 inhabitants then to 4,611 in 2026, an increase of 33.3%.
The ageing index is one of the starkest signals: in San Gemini there are 301 residents over 65 for every 100 under 14, well above the national average.
Demographic projections to 2050 estimate about 3,717 inhabitants for San Gemini: an expected decline of 19.4% from today.
Population Trend
| Anno | Popolazione |
|---|---|
| 2019 | 4910 |
| 2020 | 4888 |
| 2021 | 4836 |
| 2022 | 4769 |
| 2023 | 4737 |
| 2024 | 4690 |
| 2025 | 4628 |
| 2026 | 4611 |
Male/Female Ratio
| Valore | % | |
|---|---|---|
| Men | 2219 | 48.1% |
| Women | 2392 | 51.9% |
Demographic Statistics
Demographic Indices
Births (recent years)
| Valore | |
|---|---|
| 2021 | 24 |
| 2022 | 28 |
| 2023 | 22 |
| 2024 | 19 |
| 2025 | 25 |
Historical Population (1951-present)
| Anno | Population |
|---|---|
| 1951 | 3460 |
| 1961 | 3512 |
| 1971 | 3557 |
| 1981 | 3818 |
| 1991 | 4226 |
| 2001 | 4510 |
| 2011 | 4921 |
| 2019 | 4910 |
| 2020 | 4888 |
| 2021 | 4836 |
| 2022 | 4769 |
| 2023 | 4737 |
| 2024 | 4690 |
| 2025 | 4628 |
| 2026 | 4611 |
Marital Status (2025)
| Valore | % | |
|---|---|---|
| Single | 3696 | 39.9% |
| Married | 4524 | 48.9% |
| Divorced | 300 | 3.2% |
| Widowed | 736 | 8.0% |
School-Age Population (2026)
Total 0-18 years: 635
| Valore | |
|---|---|
| Nido (0-2) | 67 |
| Infanzia (3-5) | 80 |
| Primaria (6-10) | 137 |
| Medie (11-13) | 113 |
| Superiori (14-18) | 238 |
Foreign residents
Foreign presence and top citizenships
Embed this chart
Use the San Gemini population pyramid on your site or article — the DatiItalia source link is already included.
<a href="https://datitalia.eu/comune/san-gemini-055029" title="Population pyramid of San Gemini — DatiItalia"><img src="https://datitalia.eu/render/chart/piramide/san-gemini-055029" alt="Population pyramid of San Gemini — DatiItalia" width="600" style="max-width:100%;height:auto;border:0" loading="lazy" /></a>