countyscore

Best Soil Quality Counties in Iowa

Soil composition, pH, drainage, and organic matter content Compare rankings across all 99 counties.

Average Soil Quality Score
73/100
Top County
Winnebago County
Counties Ranked
99

Top 10

#1
Winnebago County
IA
88/100
#2
Hamilton County
IA
85/100
#3
Sac County
IA
85/100
#4
Worth County
IA
82/100
#5
Hancock County
IA
82/100
#6
Wright County
IA
82/100
#7
Clay County
IA
81/100
#8
Buena Vista County
IA
81/100
#9
O'Brien County
IA
80/100
#10
Crawford County
IA
80/100

All Iowa Counties Ranked

#CountySoil Quality ScoreOverall Score
1Winnebago County, IA
87.6
68.8
2Hamilton County, IA
85.4
57.6
3Sac County, IA
85.1
63.9
4Worth County, IA
82.2
70.4
5Hancock County, IA
81.8
61.6
6Wright County, IA
81.5
59.7
7Clay County, IA
81.4
59.7
8Buena Vista County, IA
81.2
46.7
9O'Brien County, IA
80.3
61.5
10Crawford County, IA
80.1
55.3
11Palo Alto County, IA
79.7
62.4
12Cherokee County, IA
79.2
66.8
13Sioux County, IA
78.4
59.1
14Humboldt County, IA
78.3
63.4
15Ida County, IA
78.3
71.2
16Carroll County, IA
78.2
61.5
17Emmet County, IA
78.2
61.6
18Lyon County, IA
78
65.1
19Adams County, IA
77.6
61.1
20Adair County, IA
77.4
62.5
21Cerro Gordo County, IA
77.2
42.5
22Osceola County, IA
77.2
65.3
23Franklin County, IA
77
65.5
24Polk County, IA
77
36.6
25Shelby County, IA
76.9
66.5
26Taylor County, IA
76.7
64.2
27Clayton County, IA
76.6
59.9
28Fremont County, IA
76.6
58.7
29Webster County, IA
76.5
41.6
30Montgomery County, IA
76.4
53.5
31Dickinson County, IA
76
59.1
32Calhoun County, IA
75.9
65.9
33Hardin County, IA
75.9
48.1
34Jackson County, IA
75.9
55.6
35Guthrie County, IA
75.8
60.2
36Page County, IA
75.8
52.7
37Madison County, IA
75.7
58.6
38Kossuth County, IA
75.4
66.6
39Pottawattamie County, IA
74.9
36.1
40Dallas County, IA
74.7
42
41Winneshiek County, IA
74.6
67.9
42Boone County, IA
74.5
57.8
43Allamakee County, IA
74.4
60.2
44Audubon County, IA
74.4
59.7
45Story County, IA
74.3
46.9
46Union County, IA
74.1
53.6
47Grundy County, IA
74
69.1
48Floyd County, IA
73.9
56.7
49Mills County, IA
73.6
46.7
50Plymouth County, IA
73.6
47.3
51Pocahontas County, IA
73.3
65.2
52Ringgold County, IA
73.3
60.8
53Greene County, IA
73
58.4
54Warren County, IA
72.9
51.7
55Howard County, IA
72.8
68.1
56Cass County, IA
72.5
42.7
57Butler County, IA
71.9
62.1
58Clinton County, IA
71.4
38.7
59Dubuque County, IA
71.4
45.4
60Marshall County, IA
71.4
42
61Jones County, IA
70.8
60.7
62Clarke County, IA
70.3
43.7
63Fayette County, IA
70.1
57
64Lee County, IA
69.9
42.8
65Muscatine County, IA
69.8
41.3
66Scott County, IA
69.8
37.2
67Wayne County, IA
69.8
62.9
68Wapello County, IA
69.7
33.1
69Henry County, IA
69.5
52.5
70Mitchell County, IA
69.3
66.2
71Appanoose County, IA
68.8
48.6
72Woodbury County, IA
68.8
50.9
73Delaware County, IA
68.7
60.2
74Marion County, IA
68.6
59.2
75Monroe County, IA
68.6
59.1
76Jasper County, IA
68.2
54.1
77Linn County, IA
68
40.7
78Benton County, IA
67.2
56
79Johnson County, IA
66.8
41.1
80Mahaska County, IA
66.8
51.4
81Black Hawk County, IA
66.6
40.7
82Decatur County, IA
66.5
59.4
83Louisa County, IA
66.5
61.3
84Poweshiek County, IA
66.5
46.8
85Bremer County, IA
66.4
58.6
86Jefferson County, IA
66
48.4
87Chickasaw County, IA
65.9
66.7
88Cedar County, IA
65.6
58
89Davis County, IA
65.2
56
90Des Moines County, IA
65.2
34.7
91Tama County, IA
64.9
56.6
92Washington County, IA
64.9
51.6
93Buchanan County, IA
64.8
62.4
94Iowa County, IA
64.3
56.6
95Keokuk County, IA
64.1
58.5
96Harrison County, IA
63.7
58.5
97Van Buren County, IA
63.5
60.6
98Lucas County, IA
63
55.8
99Monona County, IA
61.9
59.3

Data Source

Soil Quality data from SoilByCounty. See full details at SoilByCounty. Data updated February 2026.