This needs to be at a county level. Many blue states are deeply red outside their cities.
Yup. Atlanta is a blue dot in a sea of Georgia red.
Atlanta is a big dot though. With the growth of the Atlanta metro it may eventually make Georgia a blue state in national elections, similar to how the Twin Cities with ~60% of Minnesota population make it vote democratic.
It occasionally happens that Atlanta carries Georgia, but if you look at the composition of our state-wide representation (major office holders), it doesn't historically trend blue.