Rank County Percentage with High School Diploma
1 Story County, Iowa 95.5%
2 Johnson County, Iowa 95.3%
3 Warren County, Iowa 95.1%
4 Madison County, Iowa 93.9%
5 Bremer County, Iowa 93.5%
6 Linn County, Iowa 93.5%
7 Dallas County, Iowa 93.3%
8 Dickinson County, Iowa 93.2%
9 Iowa County, Iowa 92.9%
10 Jefferson County, Iowa 92.6%
11 Poweshiek County, Iowa 92.6%
12 Clay County, Iowa 92.4%
13 Cedar County, Iowa 92.3%
14 Benton County, Iowa 92.2%
15 Boone County, Iowa 92.2%
16 Grundy County, Iowa 92.1%
17 Cherokee County, Iowa 92.1%
18 Pocahontas County, Iowa 91.9%
19 Cass County, Iowa 91.8%
20 Cerro Gordo County, Iowa 91.7%
21 Plymouth County, Iowa 91.7%
22 Winneshiek County, Iowa 91.6%
23 Calhoun County, Iowa 91.5%
24 Fremont County, Iowa 91.4%
25 Jasper County, Iowa 91.3%
26 Guthrie County, Iowa 91.3%
27 Marion County, Iowa 91.3%
28 Harrison County, Iowa 91.2%
29 Scott County, Iowa 91.2%
30 Mills County, Iowa 91.2%
31 Floyd County, Iowa 91.0%
32 Polk County, Iowa 91.0%
33 Adair County, Iowa 90.9%
34 Clayton County, Iowa 90.9%
35 Kossuth County, Iowa 90.8%
36 Buchanan County, Iowa 90.8%
37 Shelby County, Iowa 90.8%
38 Jones County, Iowa 90.6%
39 Henry County, Iowa 90.6%
40 Dubuque County, Iowa 90.5%
41 Hardin County, Iowa 90.4%
42 Des Moines County, Iowa 90.4%
43 Worth County, Iowa 90.1%
44 Delaware County, Iowa 90.1%
45 Winnebago County, Iowa 90.0%
46 Adams County, Iowa 89.9%
47 Hamilton County, Iowa 89.9%
48 Mahaska County, Iowa 89.8%
49 Clinton County, Iowa 89.7%
50 OBrien County, Iowa 89.7%
51 Mitchell County, Iowa 89.7%
52 Hancock County, Iowa 89.7%
53 Sac County, Iowa 89.7%
54 Carroll County, Iowa 89.5%
55 Ida County, Iowa 89.5%
56 Ringgold County, Iowa 89.5%
57 Fayette County, Iowa 89.2%
58 Black Hawk County, Iowa 89.2%
59 Union County, Iowa 89.0%
60 Keokuk County, Iowa 89.0%
61 Pottawattamie County, Iowa 88.9%
62 Butler County, Iowa 88.9%
63 Tama County, Iowa 88.7%
64 Taylor County, Iowa 88.6%
65 Washington County, Iowa 88.6%
66 Chickasaw County, Iowa 88.4%
67 Van Buren County, Iowa 88.3%
68 Humboldt County, Iowa 88.2%
69 Lucas County, Iowa 88.0%
70 Monona County, Iowa 88.0%
71 Audubon County, Iowa 87.9%
72 Webster County, Iowa 87.9%
73 Palo Alto County, Iowa 87.9%
74 Page County, Iowa 87.7%
75 Emmet County, Iowa 87.7%
76 Wright County, Iowa 87.7%
77 Allamakee County, Iowa 87.6%
78 Lee County, Iowa 87.5%
79 Jackson County, Iowa 87.5%
80 Montgomery County, Iowa 87.4%
81 Monroe County, Iowa 87.2%
82 Wayne County, Iowa 87.2%
83 Lyon County, Iowa 87.1%
84 Greene County, Iowa 87.1%
85 Howard County, Iowa 87.0%
86 Sioux County, Iowa 86.8%
87 Clarke County, Iowa 86.8%
88 Appanoose County, Iowa 86.5%
89 Osceola County, Iowa 85.6%
90 Muscatine County, Iowa 85.5%
91 Woodbury County, Iowa 85.2%
92 Wapello County, Iowa 84.6%
93 Marshall County, Iowa 84.5%
94 Decatur County, Iowa 84.2%
95 Davis County, Iowa 83.5%
96 Franklin County, Iowa 83.1%
97 Louisa County, Iowa 81.7%
98 Buena Vista County, Iowa 78.7%
99 Crawford County, Iowa 78.4%

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