The cities of Alpharetta and Milton saw a 17.13% increase and a 20.56% increase, respectively, in population from 2010-19, bringing Alpharetta's population to 67,213 and Milton's population to 39,587 in 2019, census data shows.
Meanwhile, the cities of Roswell, Sandy Springs and Johns Creek saw a 7.28% increase, 16.65% increase and 10.36% increase, respectively, during the same time. The city of Atlanta saw an 18.67% population increase from 2010-19—almost 2% less than the city of Milton—bringing its population to 506,811 in 2019. However, the city of Atlanta still crossed what the Census Bureau refers to as a major population threshold from 2010-19, as it broke the 500,000 population mark.
Fulton County, which includes all of the aforementioned cities, also saw a 15.6% population increase from 2010-19, bringing the county's population to 1,063,937 in 2019. The county saw a 1.31% year-over-year increase in population from 2018-19.
See the population growth for Alpharetta and Milton below.