La Plata is one of the 135 parties in the Argentine province of Buenos Aires. The head of the party is the city of La Plata, known within the party as Casco Urbano, capital of the province of Buenos Aires, the proximity of the "Urban Quarter" and its agglomeration with Greater Buenos Aires, and the growing suburbanization of both. Agglomerates contribute to the fusion of the same in a single urban agglomeration called Metropolitan Region of Buenos Aires, although the identity of both regions has different centers of gravity.
It is for this reason, and because it is the provincial capital, that La Plata and its surroundings are not considered as part of the interior of the Province of Buenos Aires or as part of the interior of the country.