The most recent Coupons.com survey found that 20% of American’s used a digital coupon in 2009.

This represents a 170% increase in usage.

The savings generated by these coupons almost reached $1 billion.

Who’s using digital coupons? Here’s the top ten cities:

1. Atlanta
2. Tampa
3. Cincinnati
4. St. Louis
5. Minneapolis
6. Nashville
7. Charlotte
8. Cleveland
9. Pittsburg
10. Kansas City