$8\,391\,881 - 645\,169 = 7\,746\,712$.
Work Step by Step
New York City has a population of $8\,391\,881$. Boston has a population of $645\,169$. $8\,391\,881 - 645\,169 = 7\,746\,712$ more people live in New York City than in Boston.
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