The Northeast region of the United States uses bathtubs more often than other regions. This is primarily due to the prevalence of older homes in the area, which tend to have larger bathrooms with bathtubs. According to the American Housing Survey, 83% of homes in the Northeast have bathtubs, compared to 75% in the South, 72% in the Midwest, and 69% in the West. Additionally, the Northeast has a higher concentration of older homes, which were more likely to include bathtubs as a standard feature. This trend is further supported by data from the U.S. Census Bureau, which indicates that the average bathroom size in the Northeast is larger than in other regions, providing more space for bathtubs.