The Census Bureau has released its population estimates for counties and metro areas and Dane County looks like it's booming. Data can be found here.
Looking at them, I find that population of Dane County increased by 6,769 people in the 2011. Actually, I think that estimate is for the change between July 2010 and July 2011 as opposed to the calendar year. This brings the county's population up to 495,959 people - and bad things happen to Wisconsin counties when they reach the half million mark.
Those 6,769 people represent the largest jump of any Wisconsin county in sheer numbers and the second highest percentage-wise. (Menominee County placed first here by adding an estimated 86 people to its population of 4,262.)
The thing is, when I look at the data, they just seem inflated. There were 1,540 births in the 2010 data set yet 6,032 for 2011. 665 deaths in 2010 and 2,747 in 2011. And international migration brought 973 people here in 2011 which is 700 more than the previous year. It's like everything suddenly quadrupled. I don't get it. Are there any statisticians out there who can show me what I did wrong?
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