Top 10 counties, number of people

1. Cook, Ill. -- 4,371

2. Milwaukee -- 4,231

3. Columbia -- 3,918

4. Rock -- 3,907

5. Jefferson -- 2,895

6. Waukesha -- 2,571

7. Sauk -- 2,395

8. Green -- 1,792

9. Iowa -- 1,709

10. Hennepin, Minn. -- 1,393

Other counties

21. DuPage, Ill. -- 857

23. Winnebago, Ill. -- 785

25. Maricopa, Ariz. -- 736

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26. Lake, Ill. -- 689

29. Los Angeles, Calif. -- 640

31. Ramsey, Minn. -- 564

33. San Diego, Calif. -- 515

35. King, Wash. -- 489

39. Middlesex, Mass. -- 410

40. Dakota, Minn. -- 374

42. Alameda, Calif. -- 345

44. Kane, Ill. -- 334

45. St. Louis, Mo. -- 311

46. McHenry, Ill. -- 310

47. Santa Clara, Calif. -- 299

Source: U.S. Population Migration Data,

Internal Revenue Service

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