5. Hamilton County, IN

Towns include: Noblesville, Westfield
Job growth (2000-2010): 50.8%

One of the lowest unemployment rates in the state helps make Hamilton County the place for jobs in Indiana. Located just north of Indianapolis, it`s also home of the city`s wealthiest suburbs.

Indiana has embarked on Hamilton County`s biggest road project ever: the upgrading of Route 31, a major artery out of neighboring Indianapolis. The project is intended to relieve congestion, cut travel time and speed commerce.

Marsh Supermarkets and Freedom Mortgage are headquartered in the county, while Schwab, U.S. Foodservice and Sallie Mae maintain a regional presence. Recently, Marsh said it is shifting around its offices and adding 130 jobs. A sublease to recruiter First Advantage will bring in 340 people.

Before:

1. Rockwall County, TX

2. Loudoun County, VA

3. Williamson County, TX

4. Douglas County, CO

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6. Delaware County, OH

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