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Population & demographics
All demographic data for Zagarolo: population, births, deaths, balances and historical trends.
Income & tax data
Average income, median income, income brackets and historical trends for Zagarolo.
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Air quality (PM2.5, PM10, NO2) and land consumption data for Zagarolo.
Zagarolo is a medium-sized municipality in the province of Roma, Lazio region. With a population of 18.963 inhabitants and a density of 688 per km², it covers an area of 27.6 km². The average declared income is 21.203 €.
Zagarolo in numbers: the analysis
The generational balance is in line with the norm: the ageing index of Zagarolo is 148 (over-65s per 100 under-14s).
Looking ahead to 2050, projections give Zagarolo about 23,958 inhabitants, up 26.3% from today.
Compared with the provincial average of Roma (about 34,917 residents per municipality), Zagarolo is a markedly smaller centre.
Among the 121 municipalities of the province of Roma, Zagarolo ranks 25 by population.
Zagarolo has grown substantially since 1951: from 6,107 inhabitants then to 18,963 in 2026, an increase of 210.5%.
Population Trend
| Anno | Popolazione |
|---|---|
| 2019 | 17.713 |
| 2020 | 17.912 |
| 2021 | 18.010 |
| 2022 | 18.344 |
| 2023 | 18.449 |
| 2024 | 18.645 |
| 2025 | 18.876 |
| 2026 | 18.963 |
Male/Female Ratio
| Valore | % | |
|---|---|---|
| Men | 9638 | 50.8% |
| Women | 9325 | 49.2% |
Demographic Statistics
Demographic Indices
Births (recent years)
| Valore | |
|---|---|
| 2021 | 125 |
| 2022 | 155 |
| 2023 | 136 |
| 2024 | 122 |
| 2025 | 102 |
Historical Population (1951-present)
| Anno | Population |
|---|---|
| 1951 | 6107 |
| 1961 | 6260 |
| 1971 | 6197 |
| 1981 | 7318 |
| 1991 | 10.047 |
| 2001 | 12.735 |
| 2011 | 16.922 |
| 2019 | 17.713 |
| 2020 | 17.912 |
| 2021 | 18.010 |
| 2022 | 18.344 |
| 2023 | 18.449 |
| 2024 | 18.645 |
| 2025 | 18.876 |
| 2026 | 18.963 |
Marital Status (2025)
| Valore | % | |
|---|---|---|
| Single | 17.854 | 47.3% |
| Married | 16.582 | 43.9% |
| Divorced | 1360 | 3.6% |
| Widowed | 1956 | 5.2% |
School-Age Population (2026)
Total 0-18 years: 3404
| Valore | |
|---|---|
| Nido (0-2) | 384 |
| Infanzia (3-5) | 495 |
| Primaria (6-10) | 864 |
| Medie (11-13) | 554 |
| Superiori (14-18) | 1107 |
Foreign residents
Foreign presence and top citizenships
Embed this chart
Use the Zagarolo population pyramid on your site or article — the DatiItalia source link is already included.
<a href="https://datitalia.eu/comune/zagarolo-058114" title="Population pyramid of Zagarolo — DatiItalia"><img src="https://datitalia.eu/render/chart/piramide/zagarolo-058114" alt="Population pyramid of Zagarolo — DatiItalia" width="600" style="max-width:100%;height:auto;border:0" loading="lazy" /></a>