The International Diabetes Federation (IDF) does not justify the evaluation of metabolic syndrome (MetS) in children aged less than 10 years, unless they have a family history of risk factors. The prevalence of overweight and obesity in the Northwest of Mexico has increased in recent decades, making it possible to consider that MetS is already present in this group of population. Objective: The primary objective of this study was to determine the prevalence of metabolic syndrome in children aged 6 to 9 years living in rural (RA) or urban (UA) areas of Northwest of Mexico.