On March 4, 1837, the City of Chicago was incorporated.
On August 12, 1833; Chicago was incorporated as a town of 350 people. The town's boundaries are DesPlaines, Kinzie, Madison and State Streets.
On January 23, 1837, a charter was approved to incorporate Chicago as a city. On March 4, 1837; the charter was approved and Chicago became a city of 4,170 people. William B. Ogden was elected its first mayor.