According to the text, Massachusetts has the highest average IQ in the United States with 104.3, followed closely by New Hampshire with 104.2. However, the United States as a whole has an average IQ of 98. In terms of state rankings, New Hampshire ranks first in terms of IQ, while Massachusetts ranks first in education and global well-being. Some states with lower average IQ scores include Mississippi, Louisiana, and California. It is also noted that certain groups may outscore others, even within the same country or state. The top states in terms of average IQ are Massachusetts, New Hampshire, North Dakota, Vermont, and Minnesota.