Riverside Township is a civil township located in the U.S. state of Michigan. It is within Missaukee County included in the Cadillac Metro Area. It has a total area of 35.6 square miles at 44°12′31″N 85°9′16″W. The elevation is 1,220 feet above sea level. As of the 2000 census data, it had a total population of 1,050. The population density was 29.5/sq mi. Recent job growth is positively increased by 1.36 percent. The average travel time is 26 minutes. It has Zip codes 49657 (McBain) and 49665 (Marion).