United States is approximately 9,833,517 sq km, while Tanzania is approximately 947,300 sq km, making Tanzania 9.63% the size of United States. Meanwhile, the population of United States is ~332.6 million people (274.1 million fewer people live in Tanzania).
This to-scale map shows a size comparison of United States compared to Tanzania. For more details, see an in-depth quality of life comparison of Tanzania vs. United States using our country comparison tool.