The Affordable Care Act (ACA) requires employers to provide coverage or pay a penalty based on the number of employees working 30 or more hours per week. This data brief examines industries with a high percentage of employees working fewer than or slightly above 30 hours, which may be at risk for reduced hours by an employer wishing to avoid penalties. The data also shows the distribution of hours worked by type of health coverage. The industries with the highest percentage of employees working slightly over 30 hours are Restaurants, Nursing Homes, Accommodation, Healthcare, Retail Trade, Education, and Building Services. The industries with the highest concentration of vulnerable workers, those working 30 to 36 hours with incomes below 400% of the Federal Poverty Level and not covered by their own employer, are Restaurants, Accommodation, Building Services, Nursing Homes, and Retail Trade.