Brulocalis (former Association of the City and the Municipalities of the Brussels-Capital Region) is a non-profit organisation established and managed by the local authorities within the Region and aimed at providing them with services. The City and the Municipalities are part of the Association as active members, together with the Public Centres for Social Welfare (CPAS/OCMW) and inter-municipal associations as supporting members. The aim of the Association is to help the local authorities in fulfilling their mission in the service of the citizen by ensuring their protection and their promotion. Its goal: to ensure the autonomy of the local authorities for the benefit of local democracy.This action is enacted at all levels: regional, community, federal and international, within the framework of the above mentioned structures. This action passes via the close contacts that the Association maintains with the Governments, the Parliaments and the Administrations. The Association also represents the local authorities in numerous official consultative organs. This service also oversees the secretariat of various commissions and work groups, made up of local officials and representatives, who examine the concrete problems encountered by the municipalities and the Public Centres for Social Welfare. It also represents the Association in the commissions and the work groups put together by external authorities, particularly in the ministerial cabinets and the administrations, each time the technicality of the discussion requires it. The Association also assists its members in preparing projects and applying for fundings, particularly those concerning the European Union. At the request of its members, the Association can undertake research on local matters, documentary or not. This service also includes European matters.

Berchem-Sainte-Agathe is one of the smallest municipalities in the north-west of the Brussels region. It covers an area of 295 hectares and has just over 25,000 inhabitants. The rural character that the municipality has been able to preserve over the centuries makes it a real "village in the city", a village in which conviviality is an essential part of everyday life. The commune is renowned for having an enormous amount of green space in relation to its surface area. Today, despite being an integral part of the European capital, Berchem-Sainte-Agathe is a reflection of the quiet green village where everyone shares the Berchem space in an eternal climate of savoir vivre.

Forest is one of 19 municipalities in the Brussels-Capital Region. With a rich diversity of neighbourhoods bringing together some 57,000 residents, a Forest Citizens' Council (CCF - in French) was set up in 2021.

Jette is one of the 19 communes of the bilingual (French, Dutch) Brussels-Capital Region. Located 5 km from the centre of Brussels, Jette is a former village that has been overtaken by the city. It now has almost 52,000 inhabitants, spread over 3 km2. Jette is home to many families and citizens from a variety of cultures. It boasts cultural infrastructures (cultural centres, libraries) and Natura 2000 natural areas, renowned for their rich biodiversity.

Uccle is one of the 19 municipalities of the Brussels-Capital Region, Belgium. Located in the southern part of the region, it is bordered by the City of Brussels, Forest, Ixelles, and Watermael-Boitsfort, as well as the Flemish municipalities of Drogenbos, Linkebeek and Sint-Genesius-Rode. In common with all of Brussels' municipalities, it is legally bilingual (French–Dutch). As of 1 January 2022, the municipality had a population of 85,099 inhabitants. The total area is 22.87 km2 (8.83 sq mi), which gives a population density of 3,720/km2 (9,600/sq mi), half the average of Brussels. It is generally considered an affluent area of the region, and is particularly noted for its community of French immigrants.