There's only one county in the nation that had a larger population growth last year than Maricopa County.
Maricopa County's population grew by nearly 69,000 people last year, second only to Harris County, Texas, which is home to Houston.
According to Census Bureau statistics, about 40 percent of that population boost came from births outpacing deaths. There were more than 54,000 births in Maricopa County last year, but around 27,000 deaths.
The rest of the gain comes from migration. More than 31,000 people moved to Maricopa County from somewhere else in the country, and more than 8,000 came to Maricopa County from another country.
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Meanwhile, five counties actually lost people over 2013. Cochise County's population was down nearly 2 percent. In four counties, including Yavapai County, there were more deaths than births.
The state population as a whole went up more than 75,000, which puts the statewide population estimate at more than 6.6 million people.
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