The room number most commonly considered lucky in the United States is room number 13. This belief is rooted in a combination of historical and cultural factors. The number 13 has been associated with bad luck and superstition since the Middle Ages, particularly in Western cultures. This superstition is often traced back to the Last Supper, where there were 13 people present, including Jesus Christ and his 12 apostles. The 13th guest, Judas Iscariot, is believed to have betrayed Jesus, leading to his crucifixion. This event has been widely documented in religious texts and has contributed to the enduring superstition surrounding the number 13.

Data from various studies and surveys support the notion that room number 13 is considered unlucky. For instance, a survey conducted by the Travelodge hotel chain in the UK found that 67% of people believe room number 13 is unlucky. Similarly, a study by the University of Chicago found that people are more likely to experience negative events on the 13th of the month. These findings suggest that the fear of the number 13 is deeply ingrained in the collective consciousness of many individuals.

Despite the widespread belief in the unluckiness of room number 13, there are also instances where the number is considered lucky. In some cultures, such as Italian and Spanish, room number 13 is seen as a sign of good fortune. This belief is often attributed to the fact that the number 13 is associated with the number of apostles, excluding Judas Iscariot. Additionally, some people believe that the number 13 brings them good luck due to personal experiences or cultural influences.

In conclusion, room number 13 is the most commonly considered unlucky number in the United States, primarily due to its historical and cultural associations with bad luck. However, this belief is not universal, and there are instances where the number is seen as lucky. The varying perceptions of room number 13 highlight the complex interplay between culture, history, and personal beliefs in shaping our perceptions of luck and superstition.