Address to Mr Call i Sioux City, Iowa

My maternal grandmother had two female cousins who emigrated from Norway via New York in May, 1902, to Sioux City, Iowa. They were called Ambjørg (in Norway), and Emma in US. Her last name was Einang, and she was born in 1875. In many years she worked for a guy called Mr Call in Sioux City. Is it possible to find this man's address in the city? (Emma's sister was Marit/Mary). Best regards, Anne in Oslo. [;)]