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Historical Markers in Newcastle
Ponca is the county seat for Dixon County
Newcastle is in Dixon County
ADJACENT TO DIXON COUNTY Clay County, South Dakota (46) ► Union County, South Dakota (45) ►
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| On State Highway 12 at Martha Avenue, on the right when traveling east on State Highway 12. |
| Near 579 Avenue (State Highway 15 Spur) near 579 Avenue. |
| Near State Highway 15 near 579 Avenue, on the right when traveling north. |
Nov. 10, 2026