 Birkenfeld borders Pforzeim and the Enzkreis municipalities of Keltern, Straubenhardt, Neuenbürg and Engelsbrand.The former municipality of Gräfenhausen falls within Birkenfeld, therefore placing the villages Gräfenhausen and Obernhausen within Birkenfeld.The earliest known history in Birkenfeld is to be found in grave finds in a Celtic settlement in the municipality dated to 400 BC.