Actually, most people who move do so within a relatively short distance. "Migration potential" is calculated
The IRS publishes annual migration figures from tax returns; the Census also publishes five-year migration figures with the decennial census. But since that was so very long ago, let's look at the IRS numbers from 2006-07 (http://mcdc2.missouri.edu/pub/data/irsmig/Migration_Profiles/Illinois.html). These are in persons [exemptions], not households [tax returns]. The numbers are county codes; don't have the patience to strip these out right now.
Top 20 counties for NET out-migration of Cook County taxpayers
17197 Will , IL
17043 Du Page , IL
18089 Lake , IN
17089 Kane , IL
17097 Lake , IL
17111 Mchenry , IL
17093 Kendall , IL
04013 Maricopa , AZ [Phoenix]
17091 Kankakee , IL
17201 Winnebago , IL
32003 Clark , NV [Las Vegas]
17007 Boone , IL
18127 Porter , IN
48201 Harris , TX [Houston]
48439 Tarrant , TX [Ft. Worth]
06037 Los Angeles , CA
17063 Grundy , IL
17037 De Kalb , IL
55059 Kenosha , WI
48029 Bexar , TX [San Antonio]
Top five NET inbound counties (although the flows are much smaller, a few hundred):
26161 Washtenaw , MI [Detroit area]
26065 Ingham , MI [Lansing]
39035 Cuyahoga , OH [Cleveland]
26163 Wayne , MI [Detroit]
26125 Oakland , MI [Detroit area]
Top 20 destinations based on gross migration -- which most directly answers your question. This differs from the above list of 20 since that list subtracts out people who've moved into Cook County.
17043 Du Page , IL 20,368
17197 Will , IL 19,514
17097 Lake , IL 12,017
18089 Lake , IN 9,485
17089 Kane , IL 9,131
17111 Mchenry , IL 4,808
04013 Maricopa , AZ 2,499
17093 Kendall , IL 2,348
06037 Los Angeles , CA 2,194
17201 Winnebago , IL 1,502
17091 Kankakee , IL 1,428
32003 Clark , NV 1,377
36061 New York , NY 1,361
55079 Milwaukee , WI 1,291
48201 Harris , TX 1,224
27053 Hennepin , MN 1,180 [Minneapolis]
06073 San Diego , CA 1,017
18127 Porter , IN 941
17037 De Kalb , IL 907
55025 Dane , WI 907 [Madison]
The IRS publishes annual migration figures from tax returns; the Census also publishes five-year migration figures with the decennial census. But since that was so very long ago, let's look at the IRS numbers from 2006-07 (http://mcdc2.missouri.edu/pub/data/irsmig/Migration_Profiles/Illinois.html). These are in persons [exemptions], not households [tax returns]. The numbers are county codes; don't have the patience to strip these out right now.
Top 20 counties for NET out-migration of Cook County taxpayers
17197 Will , IL
17043 Du Page , IL
18089 Lake , IN
17089 Kane , IL
17097 Lake , IL
17111 Mchenry , IL
17093 Kendall , IL
04013 Maricopa , AZ [Phoenix]
17091 Kankakee , IL
17201 Winnebago , IL
32003 Clark , NV [Las Vegas]
17007 Boone , IL
18127 Porter , IN
48201 Harris , TX [Houston]
48439 Tarrant , TX [Ft. Worth]
06037 Los Angeles , CA
17063 Grundy , IL
17037 De Kalb , IL
55059 Kenosha , WI
48029 Bexar , TX [San Antonio]
Top five NET inbound counties (although the flows are much smaller, a few hundred):
26161 Washtenaw , MI [Detroit area]
26065 Ingham , MI [Lansing]
39035 Cuyahoga , OH [Cleveland]
26163 Wayne , MI [Detroit]
26125 Oakland , MI [Detroit area]
Top 20 destinations based on gross migration -- which most directly answers your question. This differs from the above list of 20 since that list subtracts out people who've moved into Cook County.
17043 Du Page , IL 20,368
17197 Will , IL 19,514
17097 Lake , IL 12,017
18089 Lake , IN 9,485
17089 Kane , IL 9,131
17111 Mchenry , IL 4,808
04013 Maricopa , AZ 2,499
17093 Kendall , IL 2,348
06037 Los Angeles , CA 2,194
17201 Winnebago , IL 1,502
17091 Kankakee , IL 1,428
32003 Clark , NV 1,377
36061 New York , NY 1,361
55079 Milwaukee , WI 1,291
48201 Harris , TX 1,224
27053 Hennepin , MN 1,180 [Minneapolis]
06073 San Diego , CA 1,017
18127 Porter , IN 941
17037 De Kalb , IL 907
55025 Dane , WI 907 [Madison]