Subdivisions of Parishes in Roman Catholic Church?

I've been trying to find out about this on the net but to no avail.

Where I come from, Indonesia - in the context of Roman Catholicism - a parish is divided into several so-called "districts", which in turn are further divided into several "neighborhoods". "districts" are named using roman numerals, e.g. District I, V, XII, etc - and "neighborhoods" are named using names of Saints e.g. St. Gregory's neighborhood.

The purpose of forming these parish sub-divisions are simply to bring together members of the community that are Roman Catholics, and get them connected and involved with Parish activities, etc. Each "neighborhoods" have their own activities, be it religious, social, philanthropic, etc.

Each parish is served by one Church, and headed by a head parish priest. "Districts" and "Neighborhoods" have their own leaders as well but they're not members of the clergy. These leaders are elected by the parish community and are of course unpaid.

My question is, is this a common occurrence in your country, wherever you come from, where a Parish has further sub-divisions? I can't seem to find an equivalent in other countries to this phenomenon we have in Indonesia. Do enlighten me, and if possible, please add some details about how things work in your country. Thanks!