Marcetelli () is a village and (municipality) in the Province of Rieti in the region of Lazio in Italy, located about northeast of Rome and about southeast of Rieti. With a population of 53, it is the least populous municipality in Lazio and one of the least populous in Italy.
Marcetelli borders the municipalities of Ascrea, Collalto Sabino, Collegiove, Paganico Sabino, Pescorocchiano, and Varco Sabino.
Demographics As of 2026, the population is 53, of which 58.5% are male, and 41.5% are female. Minors make up 7.5% of the population, and seniors make up 39.6%.
Immigration As of 2025, immigrants make up 1.9% of the total population. The foreign country of birth is Belgium.
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