San Costanzo 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 Pesaro e Urbino

Province of Pesaro e Urbino

The Province of Pesaro and Urbino is a province in the Marche region of Italy. Its capital is the city of Pesaro. It also borders the state of San Marino.-History:...

 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 Marche

Marche

The population density in the region is below the national average. In 2008, it was 161.5 inhabitants per km2, compared to the national figure of 198.8. It is highest in the province of Ancona , and lowest in the province of Macerata...

, located about 40 km northwest of Ancona

Ancona

Ancona is a city and a seaport in the Marche region, in central Italy, with a population of 101,909 . Ancona is the capital of the province of Ancona and of the region....

 and about 20 km southeast of Pesaro

Pesaro

Pesaro is a town and comune in the Italian region of the Marche, capital of the Pesaro e Urbino province, on the Adriatic. According to the 2007 census, its population was 92,206....

. As of 31 December 2004, it had a population of 4,339 and an area of 40.7 km².

The municipality of San Costanzo 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) Cerasa, Solfanuccio, and Stacciola.

San Costanzo borders the following municipalities: Fano

Fano

Fano is a town and comune of the province of Pesaro and Urbino in the Marche region of Italy. It is a beach resort 12 km southeast of Pesaro, located where the Via Flaminia reaches the Adriatic Sea...

, Mondolfo

Mondolfo

Mondolfo is a comune in the Province of Pesaro e Urbino in the Italian region Marche, located about 35 km northwest of Ancona and about 25 km southeast of Pesaro, on the Adriatic Sea...

, Monte Porzio

Monte Porzio

Monte Porzio is a comune in the Province of Pesaro e Urbino in the Italian region Marche, located about 40 km west of Ancona and about 30 km southeast of Pesaro....

, Monterado

Monterado

Monterado is a comune in the Province of Ancona in the Italian region Marche, located about 35 km west of Ancona. As of 31 December 2004, it had a population of 1,803 and an area of 10.3 km²....

, Piagge

Piagge

Piagge is a comune in the Province of Pesaro e Urbino in the Italian region Marche, located about 45 km northwest of Ancona and about 20 km south of Pesaro...

, San Giorgio di Pesaro

San Giorgio di Pesaro

San Giorgio di Pesaro is a comune in the Province of Pesaro e Urbino in the Italian region Marche, located about 45 km west of Ancona and about 25 km southeast of Pesaro....

.