Thyroid cancer incidence in Utah (1990–2009), Idaho (1999–2010), Montana (1999–2009), Wyoming (2000–2010), Colorado (1995–2009), Nebraska (1999–2009), Kansas (2000–2009), Minnesota (1988–2009), Iowa (1973–2010), Missouri (1999–2009), Arkansas (1996–2010), and Illinois (1999–2009). Rates are per 100 000 population, age-adjusted to the 2000 United States standard population. Data processing sources’: Utah, Iowa, and Arkansas (http://www.cancer-rates.info/); Idaho (http://www.idcancer.org/); Montana, Nebraska, Missouri, and Illinois (http://apps.nccd.cdc.gov/uscs/); Wyoming (http://www.health.wyo.gov/phsd/wcsp/ annualreport.html); Colorado (http://www.colorado.gov/cs/Satellite/CDPHE-PSD/CBON/1251627044620); Kansas (http://www2.kumc.edu/kcr/zsearch.aspx); and Minnesota (http://www.health.state.mn.us/divs/hpcd/cdee/mcss/)