Some counties grew in population, others shrank from 2014 to 2015.
On Thursday, the U.S. Census Bureau released population data for 2015 and Arizona continues to see a steady increase in size, while the counties change varies.
State and Metro Data
Taking a look at the 5-year population trends for Arizona and the "Phoenix-Mesa-Scottsdale" metropolitan area (as seen in the interactive charts above), the state has seen an increase of just over 360,000 residents, with the metro area seeing an approximate 324,000 resident increase.
The colored county map below shows which counties experienced the highest increase and decrease in population, as well as their 2014 and 2015 population counts, as listed by the U.S. Census Bureau.
Pinal county, which includes a portion of the Southeast Valley, experienced the largest percent increase in population from 2014 to 2015, at 2.5%, while La Paz County, which includes Blythe and Quartzsite, saw a 0.8% decrease in population.