The most common personality type is ISFJ, which stands for Introversion, Sensing, Feeling, and Judging. This type occurs in 13.8% of the US population. ISFJs are known as "The Protector" and are affirming, caring, and practical nurturers. Interestingly, ISFJ is the most common personality type for women, accounting for 19.4% of all women, while for men, the most common personality type is ISTJ, representing 16.4% of the male population. The top five most common personality types show up in over 55% of all people. Here are the top five most common personality types:

1. ISFJ (13.8%)
2. ESFJ (12.3%)
3. ISTJ (11.6%)
4. ISFP (8.8%)
5. ESTJ (8.7%)

Its important to note that different sources may have slightly different data, but the most common personality types remain consistent across sources.