 The blazon of the municipal coat of arms is "Azure a Boar's Head Argent and in chief a Mullet Or"

Safenwil has a population () of , 14.7% of the population are foreign nationals.Over the last 10 years (1997–2007) the population has changed at a rate of -0.5%.Most of the population () speaks German(92.1%), with Italian being second most common ( 1.6%) and Albanian being third ( 1.5%).