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, WHEATLAND, IA 52777-0001
PO BOX 2, WHEATLAND, IA 52777-0002
PO BOX 3, WHEATLAND, IA 52777-0003
PO BOX 4, WHEATLAND, IA 52777-0004
PO BOX 5, WHEATLAND, IA 52777-0005
PO BOX 6, WHEATLAND, IA 52777-0006
PO BOX 7, WHEATLAND, IA 52777-0007
PO BOX 8, WHEATLAND, IA 52777-0008
PO BOX 9, WHEATLAND, IA 52777-0009
PO BOX 10, WHEATLAND, IA 52777-0010
PO BOX 11, WHEATLAND, IA 52777-0011
PO BOX 12, WHEATLAND, IA 52777-0012
PO BOX 13, WHEATLAND, IA 52777-0013
PO BOX 14, WHEATLAND, IA 52777-0014
PO BOX 15, WHEATLAND, IA 52777-0015
PO BOX 16, WHEATLAND, IA 52777-0016
PO BOX 17, WHEATLAND, IA 52777-0017
PO BOX 18, WHEATLAND, IA 52777-0018
PO BOX 19, WHEATLAND, IA 52777-0019
PO BOX 20, WHEATLAND, IA 52777-0020
PO BOX 21, WHEATLAND, IA 52777-0021
PO BOX 22, WHEATLAND, IA 52777-0022
PO BOX 23, WHEATLAND, IA 52777-0023
PO BOX 24, WHEATLAND, IA 52777-0024
PO BOX 25, WHEATLAND, IA 52777-0025
PO BOX 26, WHEATLAND, IA 52777-0026
PO BOX 27, WHEATLAND, IA 52777-0027
PO BOX 28, WHEATLAND, IA 52777-0028
PO BOX 29, WHEATLAND, IA 52777-0029
PO BOX 30, WHEATLAND, IA 52777-0030
PO BOX 31, WHEATLAND, IA 52777-0031
PO BOX 32, WHEATLAND, IA 52777-0032
PO BOX 33, WHEATLAND, IA 52777-0033
PO BOX 34, WHEATLAND, IA 52777-0034
PO BOX 35, WHEATLAND, IA 52777-0035
PO BOX 36, WHEATLAND, IA 52777-0036
PO BOX 37, WHEATLAND, IA 52777-0037
PO BOX 38, WHEATLAND, IA 52777-0038
PO BOX 39, WHEATLAND, IA 52777-0039
PO BOX 40, WHEATLAND, IA 52777-0040
PO BOX 41, WHEATLAND, IA 52777-0041
PO BOX 42, WHEATLAND, IA 52777-0042
PO BOX 43, WHEATLAND, IA 52777-0043
PO BOX 44, WHEATLAND, IA 52777-0044
PO BOX 45, WHEATLAND, IA 52777-0045
PO BOX 46, WHEATLAND, IA 52777-0046
PO BOX 47, WHEATLAND, IA 52777-0047
PO BOX 48, WHEATLAND, IA 52777-0048
PO BOX 49, WHEATLAND, IA 52777-0049
PO BOX 50, WHEATLAND, IA 52777-0050
PO BOX 51, WHEATLAND, IA 52777-0051
PO BOX 52, WHEATLAND, IA 52777-0052
PO BOX 53, WHEATLAND, IA 52777-0053
PO BOX 54, WHEATLAND, IA 52777-0054
PO BOX 55, WHEATLAND, IA 52777-0055
PO BOX 56, WHEATLAND, IA 52777-0056
PO BOX 57, WHEATLAND, IA 52777-0057
PO BOX 58, WHEATLAND, IA 52777-0058
PO BOX 59, WHEATLAND, IA 52777-0059
PO BOX 60, WHEATLAND, IA 52777-0060
PO BOX 61, WHEATLAND, IA 52777-0061
PO BOX 62, WHEATLAND, IA 52777-0062
PO BOX 63, WHEATLAND, IA 52777-0063
PO BOX 64, WHEATLAND, IA 52777-0064
PO BOX 65, WHEATLAND, IA 52777-0065
PO BOX 66, WHEATLAND, IA 52777-0066
PO BOX 67, WHEATLAND, IA 52777-0067
PO BOX 68, WHEATLAND, IA 52777-0068
PO BOX 69, WHEATLAND, IA 52777-0069
PO BOX 70, WHEATLAND, IA 52777-0070
PO BOX 71, WHEATLAND, IA 52777-0071
PO BOX 72, WHEATLAND, IA 52777-0072
PO BOX 73, WHEATLAND, IA 52777-0073
PO BOX 74, WHEATLAND, IA 52777-0074
PO BOX 75, WHEATLAND, IA 52777-0075
PO BOX 76, WHEATLAND, IA 52777-0076
PO BOX 77, WHEATLAND, IA 52777-0077
PO BOX 78, WHEATLAND, IA 52777-0078
PO BOX 79, WHEATLAND, IA 52777-0079
PO BOX 80, WHEATLAND, IA 52777-0080
PO BOX 81, WHEATLAND, IA 52777-0081
PO BOX 82, WHEATLAND, IA 52777-0082
PO BOX 83, WHEATLAND, IA 52777-0083
PO BOX 84, WHEATLAND, IA 52777-0084
PO BOX 85, WHEATLAND, IA 52777-0085
PO BOX 86, WHEATLAND, IA 52777-0086
PO BOX 87, WHEATLAND, IA 52777-0087
PO BOX 88, WHEATLAND, IA 52777-0088
PO BOX 89, WHEATLAND, IA 52777-0089
PO BOX 90, WHEATLAND, IA 52777-0090
PO BOX 91, WHEATLAND, IA 52777-0091
PO BOX 92, WHEATLAND, IA 52777-0092
PO BOX 93, WHEATLAND, IA 52777-0093
PO BOX 94, WHEATLAND, IA 52777-0094
PO BOX 95, WHEATLAND, IA 52777-0095
PO BOX 96, WHEATLAND, IA 52777-0096
PO BOX 97, WHEATLAND, IA 52777-0097
PO BOX 98, WHEATLAND, IA 52777-0098
PO BOX 99, WHEATLAND, IA 52777-0099
PO BOX 100, WHEATLAND, IA 52777-0100
PO BOX 101, WHEATLAND, IA 52777-0101
PO BOX 102, WHEATLAND, IA 52777-0102
PO BOX 103, WHEATLAND, IA 52777-0103
PO BOX 104, WHEATLAND, IA 52777-0104
PO BOX 105, WHEATLAND, IA 52777-0105
PO BOX 106, WHEATLAND, IA 52777-0106
PO BOX 107, WHEATLAND, IA 52777-0107
PO BOX 108, WHEATLAND, IA 52777-0108
PO BOX 109, WHEATLAND, IA 52777-0109
PO BOX 110, WHEATLAND, IA 52777-0110
PO BOX 111, WHEATLAND, IA 52777-0111
PO BOX 112, WHEATLAND, IA 52777-0112
PO BOX 113, WHEATLAND, IA 52777-0113
PO BOX 114, WHEATLAND, IA 52777-0114
PO BOX 115, WHEATLAND, IA 52777-0115
PO BOX 116, WHEATLAND, IA 52777-0116
PO BOX 117, WHEATLAND, IA 52777-0117
PO BOX 118, WHEATLAND, IA 52777-0118
PO BOX 119, WHEATLAND, IA 52777-0119
PO BOX 120, WHEATLAND, IA 52777-0120
PO BOX 121, WHEATLAND, IA 52777-0121
PO BOX 122, WHEATLAND, IA 52777-0122
PO BOX 123, WHEATLAND, IA 52777-0123
PO BOX 124, WHEATLAND, IA 52777-0124
PO BOX 125, WHEATLAND, IA 52777-0125
PO BOX 126, WHEATLAND, IA 52777-0126
PO BOX 127, WHEATLAND, IA 52777-0127
PO BOX 128, WHEATLAND, IA 52777-0128
PO BOX 129, WHEATLAND, IA 52777-0129
PO BOX 130, WHEATLAND, IA 52777-0130
PO BOX 131, WHEATLAND, IA 52777-0131
PO BOX 132, WHEATLAND, IA 52777-0132
PO BOX 133, WHEATLAND, IA 52777-0133
PO BOX 134, WHEATLAND, IA 52777-0134
PO BOX 135, WHEATLAND, IA 52777-0135
PO BOX 136, WHEATLAND, IA 52777-0136
PO BOX 137, WHEATLAND, IA 52777-0137
PO BOX 138, WHEATLAND, IA 52777-0138
PO BOX 139, WHEATLAND, IA 52777-0139
PO BOX 140, WHEATLAND, IA 52777-0140
PO BOX 141, WHEATLAND, IA 52777-0141
PO BOX 142, WHEATLAND, IA 52777-0142
PO BOX 143, WHEATLAND, IA 52777-0143
PO BOX 144, WHEATLAND, IA 52777-0144
PO BOX 145, WHEATLAND, IA 52777-0145
PO BOX 146, WHEATLAND, IA 52777-0146
PO BOX 147, WHEATLAND, IA 52777-0147
PO BOX 148, WHEATLAND, IA 52777-0148
PO BOX 149, WHEATLAND, IA 52777-0149
PO BOX 150, WHEATLAND, IA 52777-0150
PO BOX 151, WHEATLAND, IA 52777-0151
PO BOX 152, WHEATLAND, IA 52777-0152
PO BOX 153, WHEATLAND, IA 52777-0153
PO BOX 154, WHEATLAND, IA 52777-0154
PO BOX 155, WHEATLAND, IA 52777-0155
PO BOX 156, WHEATLAND, IA 52777-0156
PO BOX 157, WHEATLAND, IA 52777-0157
PO BOX 158, WHEATLAND, IA 52777-0158
PO BOX 159, WHEATLAND, IA 52777-0159
PO BOX 160, WHEATLAND, IA 52777-0160
PO BOX 161, WHEATLAND, IA 52777-0161
PO BOX 162, WHEATLAND, IA 52777-0162
PO BOX 163, WHEATLAND, IA 52777-0163
PO BOX 164, WHEATLAND, IA 52777-0164
PO BOX 165, WHEATLAND, IA 52777-0165
PO BOX 166, WHEATLAND, IA 52777-0166
PO BOX 167, WHEATLAND, IA 52777-0167
PO BOX 168, WHEATLAND, IA 52777-0168
PO BOX 169, WHEATLAND, IA 52777-0169
PO BOX 170, WHEATLAND, IA 52777-0170
PO BOX 171, WHEATLAND, IA 52777-0171
PO BOX 172, WHEATLAND, IA 52777-0172
PO BOX 173, WHEATLAND, IA 52777-0173
PO BOX 174, WHEATLAND, IA 52777-0174
PO BOX 175, WHEATLAND, IA 52777-0175
PO BOX 176, WHEATLAND, IA 52777-0176
PO BOX 177, WHEATLAND, IA 52777-0177
PO BOX 178, WHEATLAND, IA 52777-0178
PO BOX 179, WHEATLAND, IA 52777-0179
PO BOX 180, WHEATLAND, IA 52777-0180
PO BOX 181, WHEATLAND, IA 52777-0181
PO BOX 182, WHEATLAND, IA 52777-0182
PO BOX 183, WHEATLAND, IA 52777-0183
PO BOX 184, WHEATLAND, IA 52777-0184
PO BOX 185, WHEATLAND, IA 52777-0185
PO BOX 186, WHEATLAND, IA 52777-0186
PO BOX 187, WHEATLAND, IA 52777-0187
PO BOX 188, WHEATLAND, IA 52777-0188
PO BOX 189, WHEATLAND, IA 52777-0189
PO BOX 190, WHEATLAND, IA 52777-0190
PO BOX 191, WHEATLAND, IA 52777-0191
PO BOX 192, WHEATLAND, IA 52777-0192
PO BOX 193, WHEATLAND, IA 52777-0193
PO BOX 194, WHEATLAND, IA 52777-0194
PO BOX 195, WHEATLAND, IA 52777-0195
PO BOX 196, WHEATLAND, IA 52777-0196
PO BOX 197, WHEATLAND, IA 52777-0197
PO BOX 198, WHEATLAND, IA 52777-0198
PO BOX 199, WHEATLAND, IA 52777-0199
PO BOX 200, WHEATLAND, IA 52777-0200
PO BOX 201, WHEATLAND, IA 52777-0201
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