Cass County Post Offices

906 Main St
Anita, Iowa 50020

20 E 5th St
Atlantic, Iowa 50022

123 Main St
Cumberland, Iowa 50843

608 4th St
Griswold, Iowa 51535

501 W Main St
Lewis, Iowa 51544

202 Washington St
Marne, Iowa 51552

99 Main St
Massena, Iowa 50853

405 Pioneer Ave
Wiota, Iowa 50274

Cass County

There are 8 US Post Offices in Cass County serving a total of 14,542 residents equating to 1,818 residents per post office. It's estimated that approximately 23,211 packages are handled across the 8 county post offices annually. Cass County is a county located in the U.S. state of Iowa. As of the 2010 census, the population was 13,956. Its county seat is Atlantic. It was named to honor Lewis Cass, who was the 1848 Democratic nominee for President."