I guess you mean "Zocalo", which is the generic name given to the main square in most cities and towns in Mexico. However, the most important Zocalo would be that of Mexico City.
The main plaza or town square.
The Plaza de la Constitucion, right in the middle of Mexico City. Around it you can find several historic buildings including the national palace, the Mexico City cathedral and the Aztec ruins of the Templo Mayor (Great Temple).
La Puerta del Sol is the name of the central plaza in the Spanish city of Madrid. It was originally the place of one the cities main gates.
Central Mexican Plateau or Mexican Altiplano.
The address of The Plaza in New York is at 768 on Fifth Avenue in the city of New York City, New York. The Plaza Hotel is near the south end of Central Park in New York.
The center of most Mexican cities is called the plaza. The plaza is where the center of the government is located, as well as many historic sites. It is the cultural center of the city.
Central Mexican Plateau or Mexican Altiplano.
The Plaza Hotel (which actually is now primarily a residential building, not a hotel) is at the southwest corner of 59th Street and 5th Avenue, at the southeast corner of Central Park.
A pueblo is like a sprawling ancient city, with interconnected adobe houses and a central plaza.
The Texcoco valley, in the Mexican Central Plateau.
Its official name is Plaza de la Constitucion(Constitution Plaza). Also, informally, is known as El Zocalo or El Zocalo Capitalino.
Both had a central plaza or zocalo, surrounded by the city's cathedral and the most important government buildings.
If you meant, the Plaza Hotel in New York City, at the corner of Fifth Avenue and Central Park South (the stretch of 59th Street that borders the park is called Central Park South), then, the zip code is 10019.