|Stephenson County Illinois Cities/Towns -
Cedarville, Dakota, Davis, Freeport (County Seat), German Valley, Lake Summerset, Lena, Orangeville, Pearl City, Ridott, Rock City, Winslow
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Stephenson County is a county located in the U.S. state of Illinois. As of 2016, the population was 45,624. Its county seat is Freeport.
Stephenson County was formed in 1837. The County was named for Colonel Benjamin Stephenson, an official of the Illinois Territory.