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Population & demographics
All demographic data for Isernia: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for Isernia.
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Air quality (PM2.5, PM10, NO2) and land consumption data for Isernia.
Isernia is a medium-sized municipality in the province of Isernia, Molise region. With a population of 20.491 inhabitants and a density of 297 per km², it covers an area of 69.1 km². The average declared income is 22.908 €.
Isernia in numbers: the analysis
Demographic projections to 2050 estimate about 17,658 inhabitants for Isernia: an expected decline of 13.8% from today.
The average municipality in the province of Isernia has about 1,504 residents: Isernia has 13.6 times as many.
At the regional level it sits near the very top: no. 3 most populous of the 136 municipalities in Molise.
Isernia is the most populous municipality in the province of Isernia, out of 52 in total.
Isernia has grown substantially since 1951: from 11,133 inhabitants then to 20,491 in 2026, an increase of 84.1%.
The generational balance is in line with the norm: the ageing index of Isernia is 237 (over-65s per 100 under-14s).
Population Trend
| Anno | Popolazione |
|---|---|
| 2019 | 21.400 |
| 2020 | 21.267 |
| 2021 | 20.971 |
| 2022 | 20.748 |
| 2023 | 20.685 |
| 2024 | 20.684 |
| 2025 | 20.529 |
| 2026 | 20.491 |
Male/Female Ratio
| Valore | % | |
|---|---|---|
| Men | 9900 | 48.3% |
| Women | 10.591 | 51.7% |
Demographic Statistics
Demographic Indices
Births (recent years)
| Valore | |
|---|---|
| 2021 | 117 |
| 2022 | 133 |
| 2023 | 114 |
| 2024 | 130 |
| 2025 | 114 |
Historical Population (1951-present)
| Anno | Population |
|---|---|
| 1951 | 11.133 |
| 1961 | 12.781 |
| 1971 | 15.696 |
| 1981 | 20.145 |
| 1991 | 20.933 |
| 2001 | 21.152 |
| 2011 | 22.025 |
| 2019 | 21.400 |
| 2020 | 21.267 |
| 2021 | 20.971 |
| 2022 | 20.748 |
| 2023 | 20.685 |
| 2024 | 20.684 |
| 2025 | 20.529 |
| 2026 | 20.491 |
Marital Status (2025)
| Valore | % | |
|---|---|---|
| Single | 17.722 | 43.2% |
| Married | 19.036 | 46.4% |
| Divorced | 1140 | 2.8% |
| Widowed | 3148 | 7.7% |
School-Age Population (2026)
Total 0-18 years: 3083
| Valore | |
|---|---|
| Nido (0-2) | 381 |
| Infanzia (3-5) | 371 |
| Primaria (6-10) | 843 |
| Medie (11-13) | 541 |
| Superiori (14-18) | 947 |
Foreign residents
Foreign presence and top citizenships
Embed this chart
Use the Isernia population pyramid on your site or article — the DatiItalia source link is already included.
<a href="https://datitalia.eu/comune/isernia-094023" title="Population pyramid of Isernia — DatiItalia"><img src="https://datitalia.eu/render/chart/piramide/isernia-094023" alt="Population pyramid of Isernia — DatiItalia" width="600" style="max-width:100%;height:auto;border:0" loading="lazy" /></a>