6. Delaware County, OH

Towns include: Delaware, Powell
Job growth (2000-2010): 49.2%

Planes, trains and automobiles are driving opportunities here. Just about a half-hour north of Ohio`s capital Columbus, the county offers easy access to the rest of the Midwest thanks to its municipal airport, service from CSX and Norfolk Southern Railroads, and proximity to I-71.

No wonder the county has one of the lowest unemployment rates in the state. Manufacturing is a major source of jobs, and small businesses that make everything from auto parts to diapers have been ramping up production.

Meanwhile, Mount Carmel St. Anne`s recently broke ground on a $110 million heart center. The facility, expected to open its doors in 2013, should add 60 hospital beds and about 200 new jobs to the area.

Before:

1. Rockwall County, TX

2. Loudoun County, VA

3. Williamson County, TX

4. Douglas County, CO

5. Hamilton County, IN

NEXT:

7. DeSoto County, MS

8. Utah County, UT

9. Ascension Parish, LA

10. Campbell County, WY

11. Livingston Parish, LA

12. Larimer County, CO

13. Prince William County, VA

14. Rutherford County, TN

15. Wake County, NC

16. Williamson County, TN

17. Sarpy County, NE

18. Shelby County, AL

19. Carver County, MN

20. Hendricks County, IN

21. Charleston Country, SC

22. Cache County, UT

23. Madison County, MS

24. Canadian County, OK

25. St. Croix County, WI