On 1 January 2007 Swalmen merged with Roermond to form the new municipality
Number of inhabitants (1 Jan 2003): 8.687; area: 22,96 km². Settlements:
Swalmen (seat), Asselt, Boukoul.
Flag: two equally wide horizontal stripes of red and green.
This was an unofficial flag, used by the municipal council. The colors
are derived from the municipal arms. It was finally adopted 19 Mar 1981
by municipal resolution.
Source: Sierksma's Nederlands Vlaggenboek, 1962.