Detroit never had a population of 800,000. (at least not since 2000...
) The last census put the population at around 950,000. The Census Bureau had estimated that the population had dropped significantly since then, but after the city challanged the Census Bureau estimates, they were revised to a more modest drop. Today the city is estimated to have about 915,000, or about a 4% decline from 2000. In other words, the city never really saw a net gain in population, it just wasn't shrinking nearly as fast as what the Census Bureau had originally estimated. It would be nice if the population loss was even less than the revised estimates, but I'm not so sure about that.