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.