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Wyoming. 563,626 : Cheyenne city. 59,466. Casper city. 55,316. Laramie city. 30,816. Gillette city. 29,087. Rock Springs city. 23,036. Sheridan city. 17,444. Green River city. 12,515. Evanston city. 12,359. Riverton city. 10,615. Jackson town. 9,577. Cody city. 9,520. Rawlins city. 9,259. Lander city. 7,487. Torrington city. 6,501. Powell city. 6,314. Douglas city. 6,120. Worland city. 5,487. Buffalo city. 4,585. Wheatland town