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Erin Township is located in Stephenson County, Illinois. As of the 2010 census, its population was 410 and it contained 177 housing units. The unincorporated community of Eleroy is located in the township.

Eleroy is an unincorporated community in Stephenson County, Illinois. The population was 85 at the 2000 census.

The Gerald Harbach Round Barn is a round barn near Eleroy, an unincorporated community in Stephenson County, Illinois, United States. The builder and designer of the building are unknown but it is very similar to round barns designed by the team of Jeremiah Shaffer and the Hass Brothers. It was probably built around the same time as the James Bruce Round Barn, erected in 1914, in Freeport. The Harbach Round Barn was added to the U.S. National Register of Historic Places in 1984.

WQLF (102.1 FM; "Q102") is a radio station broadcasting a classic rock format. Licensed to Lena, Illinois, the station serves the Freeport, Illinois area, and is owned by Big Radio.

The Dennis Otte Round Barn is a round barn in the U.S. state of Illinois near the unincorporated Stephenson County community of Eleroy. The barn was built in 1930 by Herman Altenbern and has a diameter of 54 feet (16.5 m). The barn is representative of the last round barn design variations that evolved. The Otte Round Barn was added to the U.S. National Register of Historic Places in 1984.

WFPS is an FM radio station in Freeport, Illinois, operating on an assigned frequency of 92.1 megahertz as authorized by the Federal Communications Commission. It shares studios with sister WFRL at 834 North Tower Road, northeast of Freeport. Their transmitter site is west of town, on Highway 20.

Lena-Winslow High School, dedicated December 7, 1958 and affectionately known as "Le-Win", is a high school located in the town of Lena, Illinois. Part of the Lena-Winslow Community Unit School District, Le-Win became the second largest school district in Stephenson County, when, in 1949, the State of Illinois mandated that larger school districts be created. Only the districts of Dakota and Freeport are larger.

Lena is a village in Stephenson County, Illinois. The population was 2,772 at the 2020 census.Lena was platted in 1853, and named after a place mentioned in a poem by Ossian.

The Lena Water Tower is a water tower located in the village of Lena, Illinois, United States. It was built in 1896 following two decades of problems with structure fires in the village. The current water tower is the result of a second attempt after the first structure proved to be unstable. The tower stands 122.5 feet (37.3 m) tall and is built of limestone and red brick. The current stainless steel water tank holds 50,000 gallons (190,000 liters) and replaced the original wooden tank in 1984. The site has two other structures, an old power plant building and a 100,000 US gallon (380,000 L) reservoir. The Lena Electric Plant Building was constructed in 1905 and the reservoir completed in 1907. The Lena Water Tower was listed on the U.S. National Register of Historic Places in 1997; the reservoir was included as a contributing property to the listing.

Pearl City is an incorporated village in Stephenson County, Illinois, with a population of 838 at the 2010 census, up from 780 in 2000.

Pearl City High School, is located in the town of Pearl City, Illinois. The campus is located 12 miles west of Freeport and 44 miles west of Rockford. It is located just six miles south of U.S. Route 20, a major east–west highway connected to Interstate 90.

Yellow Creek is an unincorporated community in Kent Township, Stephenson County, Illinois, United States. Yellow Creek is located on Yellow Creek and County Route 16, 3.2 miles (5.1 km) north-northwest of Pearl City.