Ever wonder where all the other people stop-and-going around you during your commute are on their way to? Or how many people are in town during the week versus on the weekends? No? Well, just go with me on this.

Suburb-to-suburb commuters outnumber city-to-suburb commuters in the U.S., but in a sprawling metro area like Atlanta’s, there’s a good chance your fellow commuters are on their way not just to another town, but to another county.

For their June “regional snapshot” (PDF) the ARC used 2010 census data to find out how the morning and afternoon flow of commuters affect the population of each of the 10 core metro counties by comparing daytime populations to resident populations.

“Daytime population,” by the Census Bureau’s definition, incluldes “the number of people who are present in an area during normal business hours, including workers. This is in contrast to the ‘resident’ population present during the evening and nighttime hours.”

The tricky element of that calculation is that the estimates are based on trips made only by workers, so they don’t include people coming into an area for anything other than work, like shopping, conventions, tourism or even those on business trips.

The largest daytime change occurs in Fulton Co, where the population increases by more than 32, percent to almost 1.2 million. Clayton County’s daytime population is boosted by 12.8 percent, thanks in part to the 58,000 people who work in and around the airport. Daytime population increases in Cobb and DeKalb counties are 2.3 and 0.2 percent, respectively.

At the other end of the spectrum, Paulding County’s population decreases by 25 percent during the day, and Cherokee County’s by more than 20 percent. Barrow County’s population falls by nearly 18 percent during the day, while Henry and Coweta County’s both fall by 15.7 percent.

Although it has the second largest percentage increase in daytime population for work, Clayton County also has the higest percentage of people leaving during the day for all trips combined, work and non-work. More than 51 percent of daytime trips that originate in Clayton County end somewhere else. Rockdale County was next, with about 47 precent of all daytime trips going outside the county, then DeKalb County at nearly 44 percent.

No huge surprises here, but it’s interesting to see some numbers put to the daily migrations.

On Tuesday the first numbers from the census were released, outlining which states are gaining congressional seats and which lose them. No big surprise, Georgia gained a seat. We saw an 18% increase in population over the last 10 years, and though the state hasn’t quite broken the 10 million mark, we’re close. Check the complete state stats here, but for our fair state and city:

Previous districting, blue and red, spread out over population segments of ~630k (thanks, Washington Post)

Georgia

8,186,453: population, 2000

9,687,653: population, 2010

18.3% increase

Atlanta

416,474: population, 2000

540,922: population, 2009 (details of the 2010 census will be released in the next few months)

23% increase

So Georgia (Atlanta, really) earned a 14^th congressional seat based on population gains, which will probably be in the northern suburbs, which will most likely mean another republican congressperson. In the summer Governor Deal will call a special session to redraw districts for state House, state Senate, and the new congressional seats based on population changes. I’m sure based solely on the population changes. Surely gerrymandering was just a vocab word from middle school. I assume everyone will behave like gentlemen and women.

Just for some more fun with numbers, congressmen in the 113th Congress will be representing an additional 63,520 citizens (going from 631,306 citizens per congressman in 2000 to 694,826 citizens per congressman in 2010).

The Peach Pundit update has more discussion than I care to follow, much less recap, but has information worth sharing…