CIA, it's more accurate to say that the Census's estimate declined year-over-year. But they don't think the population actually declined, they just revised their 2015 estimate downwards as well. The census now thinks there were 263,868 people in 2015 and 264,152 people in 2017, a gain of almost 300.
I think they're way underestimating the growth, but that may be because they overestimated the growth in the 2010-2014 period.
https://factfinder.census.gov/bkmk/t...20000US3436000