Zell is an unincorporated community in Faulk County, South Dakota, United States, astride U.S. Route 212. It was once a stop on the old Chicago and North Western Railway. A post office called Zell has been in operation since 1885. Zell was platted in 1886. Some say the community's name honors the local Zell family of settlers, while others believe the …Zell is an unincorporated community in Faulk County, South Dakota, United States, astride U.S. Route 212. It was once a stop on the old Chicago and North Western Railway. A post office called Zell has been in operation since 1885. Zell was platted in 1886. Some say the community's name honors the local Zell family of settlers, while others believe the community was named after one or more of the places named Zell in Germany, Austria or Switzerland.