United States is approximately 9,833,517 sq km, while Brunei is approximately 5,765 sq km, making Brunei 0.06% the size of United States. Meanwhile, the population of United States is ~332.6 million people (332.2 million fewer people live in Brunei).
This to-scale map shows a size comparison of United States compared to Brunei. For more details, see an in-depth quality of life comparison of Brunei vs. United States using our country comparison tool.