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Primary route descriptions by county
County #
County
Route description
01
Adair
I-80
Iowa 25
Iowa 90
Iowa 92
Iowa 189
Iowa 925
U.S. 6
02
Adams
Iowa 25
Iowa 49
Iowa 95
Iowa 148
Iowa 155
Iowa 186
Iowa 951
U.S. 34
03
Allamakee
Iowa 9
Iowa 26
Iowa 51
Iowa 76
Iowa 119
Iowa 364
U.S. 18
U.S. 52
04
Appanoose
Iowa 2
Iowa 5
Iowa 138
Iowa 142
Iowa 202
Iowa 216
Iowa 277
Iowa 278
Iowa 369
Iowa 938
Iowa 940
Iowa 941
05
Audubon
Iowa 44
Iowa 173
U.S. 71
06
Benton
I 380
Iowa 8
Iowa 21
Iowa 27
Iowa 82
Iowa 101
Iowa 131
Iowa 149
Iowa 150
Iowa 198
Iowa 199
Iowa 200
Iowa 201
Iowa 212
Iowa 279
Iowa 287
Iowa 363
Iowa 919
Iowa 920
Iowa 940
U.S. 30
U.S. 151
U.S. 218
07
Black Hawk
I 380
Iowa 21
Iowa 27
Iowa 57
Iowa 58
Iowa 175
Iowa 263
Iowa 281
Iowa 297
Iowa 402
Iowa 412
Iowa 933
Iowa 934
Iowa 939
Iowa 947
Iowa 969
U.S. 20
U.S. 63
U.S. 218
08
Boone
Iowa 17
Iowa 89
Iowa 144
Iowa 164
Iowa 210
Iowa 329
Iowa 430
Iowa 930
U.S. 30
U.S. 169
US ALT 30
09
Bremer
Iowa 3
Iowa 27
Iowa 93
Iowa 116
Iowa 188
Iowa 241
Iowa 334
Iowa 390
Iowa 431
Iowa 969
U.S. 63
U.S. 218
10
Buchanan
I 380
Iowa 27
Iowa 150
Iowa 187
Iowa 190
Iowa 248
Iowa 281
Iowa 282
Iowa 283
Iowa 284
Iowa 336
Iowa 939
Iowa 947
U.S. 20
11
Buena Vista
Iowa 3
Iowa 7
Iowa 10
Iowa 110
Iowa 197
Iowa 264
Iowa 351
Iowa 352
Iowa 390
Iowa 914
U.S. 71
12
Butler
Iowa 3
Iowa 14
Iowa 47
Iowa 57
Iowa 188
Iowa 326
U.S. 20
13
Calhoun
Iowa 4
Iowa 7
Iowa 124
Iowa 175
Iowa 396
U.S. 20
14
Carroll
Iowa 73
Iowa 141
Iowa 161
Iowa 217
Iowa 236
Iowa 285
Iowa 286
U.S. 30
U.S. 71
15
Cass
I 80
Iowa 48
Iowa 83
Iowa 90
Iowa 92
Iowa 148
Iowa 173
Iowa 176
Iowa 322
Iowa 414
Iowa 973
U.S. 6
U.S. 71
16
Cedar
I 80
Iowa 38
Iowa 130
Iowa 927
Iowa 979
U.S. 6
U.S. 30
17
Cerro Gordo
I 35
Iowa 27
Iowa 106
Iowa 107
Iowa 122
Iowa 288
U.S. 18
U.S. 65
18
Cherokee
Iowa 3
Iowa 7
Iowa 31
Iowa 143
Iowa 977
U.S. 59
19
Chickasaw
Iowa 24
Iowa 27
Iowa 254
Iowa 289
Iowa 346
Iowa 383
Iowa 393
Iowa 478
U.S. 18
U.S. 63
U.S. 218
20
Clarke
I 35
Iowa 104
Iowa 152
Iowa 266
Iowa 929
Iowa 942
Iowa 951
U.S. 34
U.S. 69
21
Clay
Iowa 10
Iowa 170
Iowa 240
Iowa 264
Iowa 374
U.S. 18
U.S. 71
22
Clayton
Iowa 3
Iowa 13
Iowa 56
Iowa 76
Iowa 112
Iowa 128
Iowa 290
Iowa 340
Iowa 410
Iowa 946
U.S. 181
U.S. 52
23
Clinton
Iowa 136
Iowa 291
Iowa 391
Iowa 948
Iowa 952
Iowa 956
U.S. 30
U.S. 61
U.S. 67
24
Crawford
Iowa 4
Iowa 37
Iowa 39
Iowa 45
Iowa 141
U.S. 30
U.S. 59
25
Dallas
I 80
Iowa 17
Iowa 44
Iowa 89
Iowa 90
Iowa 141
Iowa 144
Iowa 210
Iowa 232
Iowa 292
26
Davis
Iowa 2
Iowa 16
Iowa 202
Iowa 273
Iowa 957
U.S. 63
27
Decatur
I 35
Iowa 2
Iowa 204
Iowa 258
Iowa 266
Iowa 294
U.S. 69
28
Delaware
Iowa 3
Iowa 13
Iowa 38
Iowa 116
Iowa 187
Iowa 932
Iowa 938
Iowa 944
Iowa 947
U.S. 20
29
Des Moines
Iowa 79
Iowa 99
Iowa 163
Iowa 231
Iowa 394
Iowa 406
Iowa 434
Iowa 934
Iowa 935
Iowa 936
Iowa 952
U.S. 34
U.S. 61
30
Dickinson
Iowa 9
Iowa 32
Iowa 86
Iowa 203
Iowa 219
Iowa 276
Iowa 327
Iowa 356
U.S. 71
31
Dubuque
Iowa 3
Iowa 32
Iowa 136
Iowa 386
Iowa 392
Iowa 416
Iowa 418
Iowa 420
Iowa 924
Iowa 941
Iowa 946
Iowa 948
Iowa 952
Iowa 955
Iowa 959
Iowa 961
Iowa 963
Iowa 966
Iowa 967
Iowa 968
U.S. 20
U.S. 52
U.S. 61
U.S. 67
U.S. 151
32
Emmet
Iowa 4
Iowa 9
Iowa 15
Iowa 43
33
Fayette
Iowa 3
Iowa 56
Iowa 93
Iowa 102
Iowa 150
Iowa 154
Iowa 172
Iowa 187
Iowa 190
Iowa 193
Iowa 267
Iowa 281
Iowa 295
Iowa 296
Iowa 915
Iowa 916
Iowa 981
U.S. 18
34
Floyd
Iowa 14
Iowa 27
Iowa 54
Iowa 122
Iowa 147
Iowa 162
Iowa 254
Iowa 337
U.S. 18
U.S. 218
35
Franklin
I 35
Iowa 3
Iowa 57
Iowa 72
Iowa 107
Iowa 134
Iowa 263
U.S. 20
U.S. 65
36
Fremont
I 29
Iowa 2
Iowa 42
Iowa 145
Iowa 174
Iowa 184
Iowa 239
Iowa 333
Iowa 971
Iowa 975
U.S. 59
U.S. 275
37
Greene
Iowa 4
Iowa 25
Iowa 144
Iowa 397
U.S. 30
38
Grundy
Iowa 14
Iowa 57
Iowa 175
Iowa 214
Iowa 263
U.S. 20
39
Guthrie
Iowa 4
Iowa 25
Iowa 44
Iowa 73
Iowa 90
Iowa 141
Iowa 271
Iowa 342
Iowa 384
Iowa 925
U.S. 6
40
Hamilton
I 35
Iowa 17
Iowa 175
Iowa 383
Iowa 432
Iowa 520
Iowa 928
Iowa 941
U.S. 20
U.S. 69
41
Hancock
Iowa 17
Iowa 111
Iowa 179
Iowa 256
Iowa 409
Iowa 424
U.S. 18
U.S. 69
42
Hardin
Iowa 57
Iowa 118
Iowa 175
Iowa 215
Iowa 299
Iowa 359
Iowa 941
U.S. 20
U.S. 65
43
Harrison
I 29
Iowa 37
Iowa 44
Iowa 127
Iowa 183
Iowa 191
Iowa 300
Iowa 301
Iowa 409
Iowa 986
U.S. 30
U.S. 75
U.S. 30
44
Henry
Iowa 27
Iowa 78
Iowa 123
Iowa 125
Iowa 129
Iowa 163
Iowa 231
Iowa 249
Iowa 270
Iowa 424
Iowa 438
Iowa 534
Iowa 972
Iowa 976
U.S. 34
U.S. 218
45
Howard
Iowa 9
Iowa 139
Iowa 157
Iowa 272
U.S. 63
46
Humboldt
Iowa 3
Iowa 15
Iowa 17
Iowa 222
Iowa 302
Iowa 367
Iowa 408
U.S. 169
47
Ida
Iowa 31
Iowa 175
Iowa 328
Iowa 943
U.S. 20
U.S. 59
48
Iowa
I 80
Iowa 21
Iowa 149
Iowa 209
212
Iowa 220
Iowa 419
Iowa 922
Iowa 975
U.S. 6
U.S. 151
49
Jackson
Iowa 62
Iowa 64
Iowa 113
Iowa 428
Iowa 954
Iowa 985
U.S. 52
U.S. 61
U.S. 67
50
Jasper
I 80
Iowa 14
Iowa 90
Iowa 117
Iowa 163
Iowa 223
Iowa 224
Iowa 225
Iowa 330
Iowa 374
Iowa 392
Iowa 926
U.S. 6
U.S. 65
51
Jefferson
Iowa 1
Iowa 78
Iowa 163
Iowa 303
Iowa 340
Iowa 356
Iowa 904
Iowa 981
U.S. 34
52
Johnson
I 80
I 380
Iowa 1
Iowa 22
Iowa 27
Iowa 109
Iowa 153
Iowa 382
Iowa 405
Iowa 921
Iowa 923
Iowa 965
U.S. 6
U.S. 218
53
Jones
Iowa 1
Iowa 38
Iowa 64
Iowa 136
Iowa 337
Iowa 428
U.S. 151
54
Keokuk
Iowa 1
Iowa 21
Iowa 22
Iowa 23
Iowa 77
Iowa 78
Iowa 92
Iowa 108
Iowa 149
Iowa 159
Iowa 180
Iowa 304
Iowa 953
U.S. 63
55
Kossuth
Iowa 9
Iowa 15
Iowa 17
Iowa 91
Iowa 226
Iowa 250
Iowa 274
Iowa 358
Iowa 408
Iowa 422
Iowa 969
U.S. 18
56
Lee
Iowa 2
Iowa 16
Iowa 27
Iowa 88
Iowa 103
Iowa 137
Iowa 289
Iowa 394
Iowa 404
Iowa 460
Iowa 924
Iowa 944
Iowa 960
Iowa 961
Iowa 998
U.S. 61
U.S. 136
U.S. 218
57
Linn
I 380
Iowa 1
Iowa 13
Iowa 27
Iowa 84
Iowa 94
Iowa 100
Iowa 149
Iowa 150
Iowa 920
Iowa 921
Iowa 922
Iowa 931
Iowa 941
Iowa 943
Iowa 974
U.S. 30
U.S. 151
U.S. 218
58
Louisa
Iowa 70
Iowa 78
Iowa 92
Iowa 99
Iowa 252
Iowa 305
Iowa 947
U.S. 61
59
Lucas
Iowa 14
Iowa 97
Iowa 253
Iowa 306
Iowa 934
Iowa 983
Iowa 995
Iowa 996
U.S. 34
U.S. 65
60
Lyon
Iowa 9
Iowa 27
Iowa 91
Iowa 167
Iowa 178
Iowa 182
Iowa 339
U.S. 18
U.S. 75
61
Madison
I 80
Iowa 92
Iowa 162
Iowa 232
Iowa 251
Iowa 307
Iowa 322
Iowa 400
Iowa 972
Iowa 973
U.S. 6
U.S. 169
62
Mahaska
Iowa 23
Iowa 92
Iowa 102
Iowa 137
Iowa 146
Iowa 163
Iowa 309
Iowa 342
Iowa 371
Iowa 426
Iowa 432
Iowa 592
Iowa 964
U.S. 63
63
Marion
Iowa 5
Iowa 14
Iowa 92
Iowa 102
Iowa 156
Iowa 163
Iowa 181
Iowa 310
Iowa 316
Iowa 335
Iowa 365
Iowa 368
Iowa 592
Iowa 968
Iowa 975
64
Marshall
Iowa 14
Iowa 96
Iowa 146
Iowa 233
Iowa 234
Iowa 245
Iowa 311
Iowa 330
Iowa 395
Iowa 431
Iowa 930
Iowa 976
U.S. 30
U.S. ALT 30
65
Mills
Iowa 29
Iowa 41
Iowa 166
Iowa 242
Iowa 244
Iowa 370
Iowa 385
Iowa 935
Iowa 949
Iowa 972
Iowa 978
U.S. 34
U.S. 59
U.S. ALT 30
66
Mitchell
Iowa 9
Iowa 105
Iowa 177
Iowa 227
Iowa 255
Iowa 312
Iowa 946
Iowa 973
U.S. 218
67
Monona
Iowa 29
Iowa 37
Iowa 141
Iowa 175
Iowa 183
Iowa 324
Iowa 372
Iowa 475
Iowa 970
U.S. 75
68
Monroe
Iowa 5
Iowa 68
Iowa 137
Iowa 213
Iowa 915
Iowa 942
U.S. 34
69
Montgomery
Iowa 48
Iowa 115
Iowa 120
Iowa 961
U.S. 34
U.S. 71
70
Muscatine
Iowa 22
Iowa 38
Iowa 92
Iowa 373
Iowa 421
Iowa 917
Iowa 927
Iowa 953
U.S. 6
U.S. 61
71
O'Brien
Iowa 10
Iowa 60
Iowa 143
Iowa 388
Iowa 404
U.S. 18
U.S. 59
72
Osceola
Iowa 9
Iowa 60
Iowa 237
Iowa 238
Iowa 313
Iowa 404
U.S. 59
73
Page
Iowa 2
Iowa 48
Iowa 208
Iowa 333
Iowa 343
Iowa 960
Iowa 999
U.S. 59
U.S. 71
74
Palo Alto
Iowa 4
Iowa 15
Iowa 17
Iowa 314
Iowa 341
U.S. 18
75
Plymouth
Iowa 3
Iowa 7
Iowa 12
Iowa 60
Iowa 140
Iowa 403
Iowa 404
Iowa 960
U.S. 75
76
Pocahontas
Iowa 3
Iowa 4
Iowa 7
Iowa 10
Iowa 15
Iowa 195
Iowa 315
77
Polk
I 35
I 80
I 235
Iowa 5
Iowa 17
Iowa 28
Iowa 44
Iowa 46
Iowa 87
Iowa 90
Iowa 126
Iowa 141
Iowa 160
Iowa 163
Iowa 296
Iowa 312
Iowa 316
Iowa 330
Iowa 331
Iowa 338
Iowa 401
Iowa 415
Iowa 915
Iowa 926
Iowa 931
Iowa 934
Iowa 945
Iowa 950
Iowa 953
Iowa 959
U.S. 6
U.S. 65
U.S. 69
78
Pottawattamie
I 29
I 80
I 480
I 680
Iowa 83
Iowa 92
Iowa 165
Iowa 168
Iowa 183
Iowa 191
Iowa 192
Iowa 244
Iowa 347
Iowa 362
Iowa 370
Iowa 375
Iowa 973
Iowa 988
U.S. 6
U.S. 59
U.S. 75
U.S. 275
U.S. ALT 30
79
Poweshiek
I 80
Iowa 21
Iowa 85
Iowa 146
Iowa 225
Iowa 419
U.S. 6
U.S. 63
80
Ringgold
Iowa 2
Iowa 25
Iowa 66
Iowa 259
Iowa 260
Iowa 344
U.S. 169
81
Sac
Iowa 36
Iowa 39
Iowa 110
Iowa 175
Iowa 196
Iowa 243
U.S. 20
U.S. 71
82
Scott
I 74
I 80
I 280
Iowa 22
Iowa 130
Iowa 331
Iowa 387
Iowa 421
Iowa 461
Iowa 927
Iowa 956
Iowa 960
Iowa 984
U.S. 6
U.S. 61
U.S. 67
83
Shelby
Iowa 37
Iowa 44
Iowa 168
Iowa 173
Iowa 191
Iowa 268
U.S. 59
84
Sioux
Iowa 10
Iowa 12
Iowa 60
Iowa 231
Iowa 404
U.S. 18
U.S. 75
85
Story
I 35
Iowa 115
Iowa 133
Iowa 210
Iowa 211
Iowa 221
Iowa 317
Iowa 330
Iowa 430
Iowa 930
Iowa 947
U.S. 30
U.S. 65
U.S. 69
U.S. ALT 30
86
Tama
Iowa 8
Iowa 21
Iowa 96
Iowa 135
Iowa 146
Iowa 171
Iowa 212
Iowa 229
Iowa 318
U.S. 30
U.S. 63
87
Taylor
Iowa 2
Iowa 25
Iowa 49
Iowa 148
Iowa 319
88
Union
Iowa 25
Iowa 186
Iowa 260
U.S. 34
U.S. 169
89
Van Buren
Iowa 1
Iowa 2
Iowa 15
Iowa 16
Iowa 79
Iowa 81
Iowa 98
Iowa 269
90
Wapello
Iowa 16
Iowa 23
Iowa 137
Iowa 149
Iowa 163
Iowa 213
Iowa 334
Iowa 342
Iowa 380
Iowa 389
Iowa 437
Iowa 918
Iowa 958
Iowa 980
U.S. 34
U.S. 63
91
Warren
I 35
Iowa 5
Iowa 28
Iowa 60
Iowa 92
Iowa 205
Iowa 206
Iowa 207
Iowa 251
Iowa 296
Iowa 316
Iowa 349
Iowa 368
Iowa 400
Iowa 983
U.S. 65
U.S. 69
92
Washington
Iowa 1
Iowa 22
Iowa 27
Iowa 78
Iowa 92
Iowa 114
Iowa 923
Iowa 936
Iowa 957
U.S. 218
93
Wayne
Iowa 2
Iowa 14
Iowa 40
Iowa 55
Iowa 939
U.S. 65
94
Webster
Iowa 7
Iowa 50
Iowa 53
Iowa 121
Iowa 144
Iowa 175
Iowa 413
Iowa 926/
BUS U.S. 169
Iowa 928
Iowa 934
Iowa 997
U.S. 20
U.S. 169
95
Winnebago
Iowa 9
Iowa 105
Iowa 254
Iowa 332
Iowa 381
Iowa 971
U.S. 69
96
Winneshiek
Iowa 9
Iowa 24
Iowa 139
Iowa 150
Iowa 193
Iowa 325
Iowa 965
U.S. 52
97
Woodbury
I 29
I 129
Iowa 7
Iowa 12
Iowa 31
Iowa 140
Iowa 141
Iowa 175
Iowa 243
Iowa 376
Iowa 377
Iowa 378
Iowa 403
Iowa 475
Iowa 914
Iowa 943
Iowa 970
Iowa 982
Iowa 985
U.S. 20
U.S. 75
U.S. 77
98
Worth
I 35
Iowa 9
Iowa 27
Iowa 86
Iowa 105
Iowa 337
Iowa 379
Iowa 972
U.S. 65
U.S. 69
99
Wright
I 35
Iowa 3
Iowa 17
Iowa 72
Iowa 262
Iowa 323
Iowa 353
U.S. 69