Union County, South Dakota

• Alcester@
• Elk Point@
• Jefferson@
• North Sioux City@

• Regional: United States: South Dakota 

• Global Community Monitor  - Article detailing Hyperion opinion that Union County, SD is primary target for energy center.
• National Association of Counties: Union County, SD  - Brief information about the county, demographic and census data, and list of elected officials.
• National Register of Historical Places: Union County, South Dakota  - National register of the historical places and districts in the county. Gives information about the historical significance, function, architectural style, builder, and owner.
• Union County Historical Society  - Helps foster an understanding, preserve information, and to further appreciate the history of Union County.
• Union County Sheriff  - Partners with the community to provide safe and affective law enforcement.