Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Sedgwick County is the northeasternmost of the 64 counties of the state of Colorado of the United States. The county was named for Fort Sedgwick, a military post along the Platte Trail, which was named for General John Sedgwick. The county population was 2,379 at U.S. 2010 Census. The county seat is Julesburg.Sedgwick County was named after John Sedgwick, who was a Major General in the Union Army during the American Civil War.According to the 2000 census, the county has a total area of 549.60 square miles (1,423.5 km2), of which 548.24 square miles (1,419.9 km2) (or 99.75%) is land and 1.36 square miles (3.5 km2) (or 0.25%) is water.