List of counties in Wyoming
There are 23 counties in the U.S. state of Wyoming. First there were five counties in the Wyoming Territory.  They were Laramie and Carter, formed in 1867; Carbon and Albany formed in 1868; and Uinta, an added portion of Utah and Idaho, extending from Montana (including Yellowstone Park) to the Wyoming-Utah boundary. On July 10, 1890, Wyoming was admitted to the Union with thirteen counties.