Platte County was an unorganized county of the Territory of Colorado that existed for two years from 1872 to 1874. Platte County was created from, and reverted to, Weld County, Colorado.
History
On 1872-02-09, the Colorado General Assembly created Platte County from the eastern portion of Weld County. Platte County expired on 1874-02-09, after organizers failed to secure voter approval. The territory of the county reverted to Weld County.
References
Platte County, Colorado Territory Wikipedia(Text) CC BY-SA