A PO BOX number can be less than or more than four digit. For post office boxes, the general rule is that each box has its own ZIP+4 code.
The last four digit is often one of the following:
1. Zero plus the last three digits of the box number (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. The last four digits of the box number (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. If the box number is less than four digits, enough zeros prepended to the front of the box number to produce a four-digit number(eg. PO BOX 1, Shreveport LA 71161-0001).
However, there is no uniform rule, the zip code plus four is for reference only, the ZIP+4 code must be looked up individually for each box in the USPS offical website.
PO BOX 1, GRAETTINGER, IA 51342-0001
PO BOX 2, GRAETTINGER, IA 51342-0002
PO BOX 3, GRAETTINGER, IA 51342-0003
PO BOX 4, GRAETTINGER, IA 51342-0004
PO BOX 5, GRAETTINGER, IA 51342-0005
PO BOX 6, GRAETTINGER, IA 51342-0006
PO BOX 7, GRAETTINGER, IA 51342-0007
PO BOX 8, GRAETTINGER, IA 51342-0008
PO BOX 9, GRAETTINGER, IA 51342-0009
PO BOX 10, GRAETTINGER, IA 51342-0010
PO BOX 11, GRAETTINGER, IA 51342-0011
PO BOX 12, GRAETTINGER, IA 51342-0012
PO BOX 13, GRAETTINGER, IA 51342-0013
PO BOX 14, GRAETTINGER, IA 51342-0014
PO BOX 15, GRAETTINGER, IA 51342-0015
PO BOX 16, GRAETTINGER, IA 51342-0016
PO BOX 17, GRAETTINGER, IA 51342-0017
PO BOX 18, GRAETTINGER, IA 51342-0018
PO BOX 19, GRAETTINGER, IA 51342-0019
PO BOX 20, GRAETTINGER, IA 51342-0020
PO BOX 21, GRAETTINGER, IA 51342-0021
PO BOX 22, GRAETTINGER, IA 51342-0022
PO BOX 23, GRAETTINGER, IA 51342-0023
PO BOX 24, GRAETTINGER, IA 51342-0024
PO BOX 25, GRAETTINGER, IA 51342-0025
PO BOX 26, GRAETTINGER, IA 51342-0026
PO BOX 27, GRAETTINGER, IA 51342-0027
PO BOX 28, GRAETTINGER, IA 51342-0028
PO BOX 29, GRAETTINGER, IA 51342-0029
PO BOX 30, GRAETTINGER, IA 51342-0030
PO BOX 31, GRAETTINGER, IA 51342-0031
PO BOX 32, GRAETTINGER, IA 51342-0032
PO BOX 33, GRAETTINGER, IA 51342-0033
PO BOX 34, GRAETTINGER, IA 51342-0034
PO BOX 35, GRAETTINGER, IA 51342-0035
PO BOX 36, GRAETTINGER, IA 51342-0036
PO BOX 37, GRAETTINGER, IA 51342-0037
PO BOX 38, GRAETTINGER, IA 51342-0038
PO BOX 39, GRAETTINGER, IA 51342-0039
PO BOX 40, GRAETTINGER, IA 51342-0040
PO BOX 41, GRAETTINGER, IA 51342-0041
PO BOX 42, GRAETTINGER, IA 51342-0042
PO BOX 43, GRAETTINGER, IA 51342-0043
PO BOX 44, GRAETTINGER, IA 51342-0044
PO BOX 45, GRAETTINGER, IA 51342-0045
PO BOX 46, GRAETTINGER, IA 51342-0046
PO BOX 47, GRAETTINGER, IA 51342-0047
PO BOX 48, GRAETTINGER, IA 51342-0048
PO BOX 49, GRAETTINGER, IA 51342-0049
PO BOX 50, GRAETTINGER, IA 51342-0050
PO BOX 51, GRAETTINGER, IA 51342-0051
PO BOX 52, GRAETTINGER, IA 51342-0052
PO BOX 53, GRAETTINGER, IA 51342-0053
PO BOX 54, GRAETTINGER, IA 51342-0054
PO BOX 55, GRAETTINGER, IA 51342-0055
PO BOX 56, GRAETTINGER, IA 51342-0056
PO BOX 57, GRAETTINGER, IA 51342-0057
PO BOX 58, GRAETTINGER, IA 51342-0058
PO BOX 59, GRAETTINGER, IA 51342-0059
PO BOX 60, GRAETTINGER, IA 51342-0060
PO BOX 61, GRAETTINGER, IA 51342-0061
PO BOX 62, GRAETTINGER, IA 51342-0062
PO BOX 63, GRAETTINGER, IA 51342-0063
PO BOX 64, GRAETTINGER, IA 51342-0064
PO BOX 65, GRAETTINGER, IA 51342-0065
PO BOX 66, GRAETTINGER, IA 51342-0066
PO BOX 67, GRAETTINGER, IA 51342-0067
PO BOX 68, GRAETTINGER, IA 51342-0068
PO BOX 69, GRAETTINGER, IA 51342-0069
PO BOX 70, GRAETTINGER, IA 51342-0070
PO BOX 71, GRAETTINGER, IA 51342-0071
PO BOX 72, GRAETTINGER, IA 51342-0072
PO BOX 73, GRAETTINGER, IA 51342-0073
PO BOX 74, GRAETTINGER, IA 51342-0074
PO BOX 75, GRAETTINGER, IA 51342-0075
PO BOX 76, GRAETTINGER, IA 51342-0076
PO BOX 77, GRAETTINGER, IA 51342-0077
PO BOX 78, GRAETTINGER, IA 51342-0078
PO BOX 79, GRAETTINGER, IA 51342-0079
PO BOX 80, GRAETTINGER, IA 51342-0080
PO BOX 81, GRAETTINGER, IA 51342-0081
PO BOX 82, GRAETTINGER, IA 51342-0082
PO BOX 83, GRAETTINGER, IA 51342-0083
PO BOX 84, GRAETTINGER, IA 51342-0084
PO BOX 85, GRAETTINGER, IA 51342-0085
PO BOX 86, GRAETTINGER, IA 51342-0086
PO BOX 87, GRAETTINGER, IA 51342-0087
PO BOX 88, GRAETTINGER, IA 51342-0088
PO BOX 89, GRAETTINGER, IA 51342-0089
PO BOX 90, GRAETTINGER, IA 51342-0090
PO BOX 91, GRAETTINGER, IA 51342-0091
PO BOX 92, GRAETTINGER, IA 51342-0092
PO BOX 93, GRAETTINGER, IA 51342-0093
PO BOX 94, GRAETTINGER, IA 51342-0094
PO BOX 95, GRAETTINGER, IA 51342-0095
PO BOX 96, GRAETTINGER, IA 51342-0096
PO BOX 97, GRAETTINGER, IA 51342-0097
PO BOX 98, GRAETTINGER, IA 51342-0098
PO BOX 99, GRAETTINGER, IA 51342-0099
PO BOX 100, GRAETTINGER, IA 51342-0100
PO BOX 101, GRAETTINGER, IA 51342-0101
PO BOX 102, GRAETTINGER, IA 51342-0102
PO BOX 103, GRAETTINGER, IA 51342-0103
PO BOX 104, GRAETTINGER, IA 51342-0104
PO BOX 105, GRAETTINGER, IA 51342-0105
PO BOX 106, GRAETTINGER, IA 51342-0106
PO BOX 107, GRAETTINGER, IA 51342-0107
PO BOX 108, GRAETTINGER, IA 51342-0108
PO BOX 109, GRAETTINGER, IA 51342-0109
PO BOX 110, GRAETTINGER, IA 51342-0110
PO BOX 111, GRAETTINGER, IA 51342-0111
PO BOX 112, GRAETTINGER, IA 51342-0112
PO BOX 113, GRAETTINGER, IA 51342-0113
PO BOX 114, GRAETTINGER, IA 51342-0114
PO BOX 115, GRAETTINGER, IA 51342-0115
PO BOX 116, GRAETTINGER, IA 51342-0116
PO BOX 117, GRAETTINGER, IA 51342-0117
PO BOX 118, GRAETTINGER, IA 51342-0118
PO BOX 119, GRAETTINGER, IA 51342-0119
PO BOX 120, GRAETTINGER, IA 51342-0120
PO BOX 121, GRAETTINGER, IA 51342-0121
PO BOX 122, GRAETTINGER, IA 51342-0122
PO BOX 123, GRAETTINGER, IA 51342-0123
PO BOX 124, GRAETTINGER, IA 51342-0124
PO BOX 125, GRAETTINGER, IA 51342-0125
PO BOX 126, GRAETTINGER, IA 51342-0126
PO BOX 127, GRAETTINGER, IA 51342-0127
PO BOX 128, GRAETTINGER, IA 51342-0128
PO BOX 129, GRAETTINGER, IA 51342-0129
PO BOX 130, GRAETTINGER, IA 51342-0130
PO BOX 131, GRAETTINGER, IA 51342-0131
PO BOX 132, GRAETTINGER, IA 51342-0132
PO BOX 133, GRAETTINGER, IA 51342-0133
PO BOX 134, GRAETTINGER, IA 51342-0134
PO BOX 135, GRAETTINGER, IA 51342-0135
PO BOX 136, GRAETTINGER, IA 51342-0136
PO BOX 137, GRAETTINGER, IA 51342-0137
PO BOX 138, GRAETTINGER, IA 51342-0138
PO BOX 139, GRAETTINGER, IA 51342-0139
PO BOX 140, GRAETTINGER, IA 51342-0140
PO BOX 141, GRAETTINGER, IA 51342-0141
PO BOX 142, GRAETTINGER, IA 51342-0142
PO BOX 143, GRAETTINGER, IA 51342-0143
PO BOX 144, GRAETTINGER, IA 51342-0144
PO BOX 145, GRAETTINGER, IA 51342-0145
PO BOX 146, GRAETTINGER, IA 51342-0146
PO BOX 147, GRAETTINGER, IA 51342-0147
PO BOX 148, GRAETTINGER, IA 51342-0148
PO BOX 149, GRAETTINGER, IA 51342-0149
PO BOX 150, GRAETTINGER, IA 51342-0150
PO BOX 151, GRAETTINGER, IA 51342-0151
PO BOX 152, GRAETTINGER, IA 51342-0152
PO BOX 153, GRAETTINGER, IA 51342-0153
PO BOX 154, GRAETTINGER, IA 51342-0154
PO BOX 155, GRAETTINGER, IA 51342-0155
PO BOX 156, GRAETTINGER, IA 51342-0156
PO BOX 157, GRAETTINGER, IA 51342-0157
PO BOX 158, GRAETTINGER, IA 51342-0158
PO BOX 159, GRAETTINGER, IA 51342-0159
PO BOX 160, GRAETTINGER, IA 51342-0160
PO BOX 161, GRAETTINGER, IA 51342-0161
PO BOX 162, GRAETTINGER, IA 51342-0162
PO BOX 163, GRAETTINGER, IA 51342-0163
PO BOX 164, GRAETTINGER, IA 51342-0164
PO BOX 165, GRAETTINGER, IA 51342-0165
PO BOX 166, GRAETTINGER, IA 51342-0166
PO BOX 167, GRAETTINGER, IA 51342-0167
PO BOX 168, GRAETTINGER, IA 51342-0168
PO BOX 169, GRAETTINGER, IA 51342-0169
PO BOX 170, GRAETTINGER, IA 51342-0170
PO BOX 171, GRAETTINGER, IA 51342-0171
PO BOX 172, GRAETTINGER, IA 51342-0172
PO BOX 173, GRAETTINGER, IA 51342-0173
PO BOX 174, GRAETTINGER, IA 51342-0174
PO BOX 175, GRAETTINGER, IA 51342-0175
PO BOX 176, GRAETTINGER, IA 51342-0176
PO BOX 177, GRAETTINGER, IA 51342-0177
PO BOX 178, GRAETTINGER, IA 51342-0178
PO BOX 179, GRAETTINGER, IA 51342-0179
PO BOX 180, GRAETTINGER, IA 51342-0180
PO BOX 181, GRAETTINGER, IA 51342-0181
PO BOX 182, GRAETTINGER, IA 51342-0182
PO BOX 183, GRAETTINGER, IA 51342-0183
PO BOX 184, GRAETTINGER, IA 51342-0184
PO BOX 185, GRAETTINGER, IA 51342-0185
PO BOX 186, GRAETTINGER, IA 51342-0186
PO BOX 187, GRAETTINGER, IA 51342-0187
PO BOX 188, GRAETTINGER, IA 51342-0188
PO BOX 189, GRAETTINGER, IA 51342-0189
PO BOX 190, GRAETTINGER, IA 51342-0190
PO BOX 191, GRAETTINGER, IA 51342-0191
PO BOX 192, GRAETTINGER, IA 51342-0192
PO BOX 193, GRAETTINGER, IA 51342-0193
PO BOX 194, GRAETTINGER, IA 51342-0194
PO BOX 195, GRAETTINGER, IA 51342-0195
PO BOX 196, GRAETTINGER, IA 51342-0196
PO BOX 197, GRAETTINGER, IA 51342-0197
PO BOX 198, GRAETTINGER, IA 51342-0198
PO BOX 199, GRAETTINGER, IA 51342-0199
PO BOX 200, GRAETTINGER, IA 51342-0200
PO BOX 201, GRAETTINGER, IA 51342-0201
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