The history of Mason City dates back to 1853, when the first settlers established themselves at the confluence of the Winnebago River and Willow Creek. Initially, this location was known as Shibboleth, and shortly thereafter as Masonic Grove.
The city received its modern name in 1855. The name was chosen in honour of the Masonic fraternity (Freemasonry), as many of the city's founding fathers were members. This is a rare example of a toponym that directly reflects the influence of a specific social organisation during the early stages of a settlement's development.
The transformation of a small settlement into a significant regional centre was driven by a combination of several factors:
- Geography and Resources: The riverside location provided energy for the first mills and sawmills. Furthermore, rich deposits of limestone and clay were discovered in the vicinity, which subsequently made the city a hub for cement and brick production.
- Political Power: A decisive moment in the city's history was the struggle for the status of the administrative centre of Cerro Gordo County. In the late 1850s, Mason City won this right over its competitors, guaranteeing an influx of people and infrastructure development.
- Transport Hub: Although railways arrived a bit later, the city's geographical position made it a natural trading crossroads for farmers in northern Iowa.
In the early years, Mason City's economy relied on agriculture and trade serving the needs of pioneers. The city quickly became a local sales market for surrounding farms.
Cultural life in the early period formed around social institutions typical of the frontier, but with a noticeable influence of organisation and order introduced by the founders. The status of an administrative centre facilitated the appearance of law firms, banks, and newspapers, laying the foundation for future prosperity.