| Pilar | |
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Pilar
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| Coordinates: | |
| Country | Argentina |
| Province | Buenos Aires |
| Partido | Pilar |
| Elevation | 18 m (59 ft) |
| Population (2001 census [INDEC]) | |
| • Total | 226,517 |
| CPA Base | B 1629 |
| Area code(s) | +54 2322 |
Pilar is a city in the province of Buenos Aires, Argentina. It has a population of more than 226,000 inhabitants as per the 2001 census [INDEC]. Pilar is part of the Greater Buenos Aires urban conurbation and is the head of the administrative division of Pilar Partido. It is well known for its heavy metal band Jheronimus Bosch.
Pilar is the site where the Treaty of Pilar was signed on February 23, 1820, establishing the basis for Argentine federalism. Because of this relevant event, the city of Pilar is acknowledged as the "Cradle of National Federalism". This Treaty marked the end of the war between the provinces of Entre Ríos and Santa Fe against Buenos Aires.
Pilar has experienced a huge demographic expansion, specially in the last decade, that has brought with it rapid economic development. The city has become known as an exclusive residential hideaway from downtown Buenos Aires where many affluent families own houses in gated communities.