The district was created in 1939 as the successor of theOberamt Rastatt and later theGroßkreis Baden. In 1973 it was merged with the majority of the neighboring district Bühl, and some small parts of the district Kehl.
The county has three smallexclaves within the borough of Baden-Baden. The largest of these is home to theWaldenecksee and the smallest is the oldFremersberg Abbey [de].
Since 1968 the district has partnership with theFinnish cityVantaa. The partnership with theItalianProvincia di Pesaro e Urbino was started in 1996.It is twinned withFano in Italy,New Britain, Connecticut in the USA and also twinned withWoking, England in 2000. It is also twinned with the Czech town from which its Princess came from during the Baroque period and for whom the summer palace was built.
The top-left corner of the coat of arms show a wine ladder, the symbol of the city Rastatt. The grapes in the top-right symbolize theviticulture in the area around Bühl. The red bar on yellow ground in the bottom-right is the symbol ofBaden, and the rose in bottom-left is the symbol of the counts of Eberstein.