Polk County is named in honor of William Henry Polk, Secretary of State under President Lincoln and Johnson.

Andreas' History of Nebraska - Polk County
Andreas' History of Nebraska - Biographical sketches of people of Polk County
Beaver Crossing - History of the town, founded in 1868.
1890 Gazetter - The 1890 Nebraska Business Gazetter for Polk County
1890 Gazetter - The 1890 Nebraska Gazetter Farmers List for Polk County
Historical Oldtime Nebraska - Historical Articles about Nebraska and its People
Historical Markers - Historical Markers in Polk County
Osceola - History of the town, founded in 1868.
Polk - History of the town, founded in 1906.
Polk County Historical Museum - Western Heritage Village Home Page
Polk County Locations - National Registry of Historic Places
Polk County Schools - History of Polk County Schools
Polk - Immigrant Issue, Lincoln Star Journal: June 5, 1887
Politicians - Early Politicians from Polk County, 1873 - 1927
Shelby - History of the town, founded in 1880.
Stromsburg - History of the town, founded in 1872.