Unemployment rates rose in more than two-thirds of U.S. cities last month, evidence that the slowdown in hiring in May was felt nationwide.Here are the cities with the highest and lowest unemployment rates last month:Best and Worst Metro areasFigures are in percentagesHighest unemployment rates May 2012Yuma, Ariz. 28.9El Centro, Calif. 26.8Yuba City, Calif. 17.9Merced, Calif. 17.3Modesto, Calif. 15.6Fresno, Calif. 14.9Hanford-Corcoran, Calif. 14.8Visalia-Porterville, Calif. 14.7Stockton, Calif. 14.5Madera-Chowchilla, Calif. 14.3Lowest unemployment rates May 2012Bismarck, N.D. 2.5Fargo, N.D. 3.0Lincoln, Neb. 3.4Burlington-S. Burlington Vt. 3.5Iowa City, Iowa 3.6Grand Forks, N.D. 3.7Sioux Falls, S.D. 3.8Midland, Texas 3.8Ames, Iowa 3.9Portsmouth, N.H. 4.1
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