The total area of a city in Michigan is $102.1$ square miles of which $13.1$ square miles is water. If the city had a population of $621,000$ people in the year $2012,$ which of the following is closest to the population density in people per square mile of land area, of the city at that time ?

Question

$\begin{array}{1 1} (a)\; 6073 \\ (b)\; 6173 \\ (c)\;6273 \\ (d)\;6373 \end{array}$