Castelletto d'Orba is a comune

Comune

In Italy, the comune is the basic administrative division, and may be properly approximated in casual speech by the English word township or municipality.-Importance and function:...

(municipality) in the Province of Alessandria

Province of Alessandria

The Province of Alessandria is an Italian province, with a population of some 430,000, which forms the southeastern part of the region of Piedmont. The provincial capital is the city of Alessandria....

 in the Italian

Italy

Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

 region Piedmont

Piedmont

Piedmont is one of the 20 regions of Italy. It has an area of 25,402 square kilometres and a population of about 4.4 million. The capital of Piedmont is Turin. The main local language is Piedmontese. Occitan is also spoken by a minority in the Occitan Valleys situated in the Provinces of...

, located about 90 km southeast of Turin

Turin

Turin is a city and major business and cultural centre in northern Italy, capital of the Piedmont region, located mainly on the left bank of the Po River and surrounded by the Alpine arch. The population of the city proper is 909,193 while the population of the urban area is estimated by Eurostat...

 and about 25 km south of Alessandria

Alessandria

-Monuments:* The Citadel * The church of Santa Maria di Castello * The church of Santa Maria del Carmine * Palazzo Ghilini * Università del Piemonte Orientale-Museums:* The Marengo Battle Museum...

. As of 31 December 2004, it had a population of 1,979 and an area of 14.3 km².

The municipality of Castelletto d'Orba contains the frazioni

Frazione

A frazione , in Italy, is the name given in administrative law to a type of territorial subdivision of a comune; for other administrative divisions, see municipio, circoscrizione, quartiere...

(subdivisions, mainly villages and hamlets) Cazzuli, Crebini, and Passaronda.

Castelletto d'Orba borders the following municipalities: Capriata d'Orba

Capriata d'Orba

Capriata d'Orba is a comune in the Province of Alessandria in the Italian region Piedmont, located about 90 km southeast of Turin and about 25 km south of Alessandria...

, Lerma

Lerma

Lerma is a comune in the Province of Alessandria in the Italian region Piedmont, located about 90 km southeast of Turin and about 30 km south of Alessandria....

, Montaldeo

Montaldeo

Montaldeo is a comune in the Province of Alessandria in the Italian region Piedmont, located about 100 km southeast of Turin and about 35 km southeast of Alessandria...

, San Cristoforo

San Cristoforo

San Cristoforo is a comune in the Province of Alessandria in the Italian region Piedmont, located about 90 km southeast of Turin and about 30 km southeast of Alessandria...

, and Silvano d'Orba

Silvano d'Orba

Silvano d'Orba is a comune in the Province of Alessandria in the Italian region Piedmont, located about 90 km southeast of Turin and about 25 km south of Alessandria...

.