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Armstrong County is a former county.
[edit] Timeline
[edit] Population History
Note: reported in 1890 (as Pyatt) and 1900 although largely included with Cheyenne River Indian Reservation; reported in 1910; enumerated with Ziebach in 1920; reported in 1930- 50; annexed to Dewey in 1954. (An earlier Armstrong County was created after 1870 and was part of Hutchinson County by 1880.) [edit] Research Tips
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