Castelletto d'Erro is a small municipality in the province of Alessandria, Piemonte region. With a population of 115 inhabitants and a density of 25 per km², it covers an area of 4.7 km². The average declared income is 19.428 €.
ISTAT Code: 006048
44.6251°N, 8.3944°E
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Total 0-18 years: 7
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