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The counties of Weston and Big Horn were created by the eleventh legislative assembly in March of 1890, just before Wyoming achieved statehood that July. This map by George F. Cram of Chicago shows the new counties, bringing the total to thirteen.…

For the fourteen-month period from March 2, 1863, to May 26, 1864, the area that is now Wyoming was part of Idaho territory. On the same 1864 date, Montana became a territory. Sparse population made these jurisdictional changes of little importance.

A map of the 13-county configuration which existed for nineteen years, from 1890 to 1909. The map shows the Fremont, Elkhorn, and Missouri Valley Railroad (later the Chicago Northwestern) to Casper, but short of its eventual terminus of Lander.

This circa 1900 map by George F. Cram of Chicago reflects railroad development in Wyoming. The Burlington and Missouri Valley built across Weston County in 1889. The Union Pacific from Cheyenne north to Wendover and the Oregon Short Line from Granger…

The eleven counties of Wyoming territory as they appeared from 1888 to 1890, when Weston and Big Horn counties were formed.

From an atlas produced by S. Augustus Mitchell of Philadelphia. This 1870 rendering reflects the construction of the Denver Pacific Railroad, joining the Union Pacific at Cheyenne, from the south.