Wilber is a city in and the county seat of Saline County, Nebraska, United States. The population was 1,855 at the 2010 census. It is the count…Wilber is a city in and the county seat of Saline County, Nebraska, United States. The population was 1,855 at the 2010 census. It is the county seat of Saline County. Wilber is the official "Czech Capital of the USA" and hosts an annual Czech festival in August. Wilber's school is the Wilber-Clatonia High School.