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, SCHALLER, IA 51053-0001
PO BOX 2, SCHALLER, IA 51053-0002
PO BOX 3, SCHALLER, IA 51053-0003
PO BOX 4, SCHALLER, IA 51053-0004
PO BOX 5, SCHALLER, IA 51053-0005
PO BOX 6, SCHALLER, IA 51053-0006
PO BOX 7, SCHALLER, IA 51053-0007
PO BOX 8, SCHALLER, IA 51053-0008
PO BOX 9, SCHALLER, IA 51053-0009
PO BOX 10, SCHALLER, IA 51053-0010
PO BOX 11, SCHALLER, IA 51053-0011
PO BOX 12, SCHALLER, IA 51053-0012
PO BOX 13, SCHALLER, IA 51053-0013
PO BOX 14, SCHALLER, IA 51053-0014
PO BOX 15, SCHALLER, IA 51053-0015
PO BOX 16, SCHALLER, IA 51053-0016
PO BOX 17, SCHALLER, IA 51053-0017
PO BOX 18, SCHALLER, IA 51053-0018
PO BOX 19, SCHALLER, IA 51053-0019
PO BOX 20, SCHALLER, IA 51053-0020
PO BOX 21, SCHALLER, IA 51053-0021
PO BOX 22, SCHALLER, IA 51053-0022
PO BOX 23, SCHALLER, IA 51053-0023
PO BOX 24, SCHALLER, IA 51053-0024
PO BOX 25, SCHALLER, IA 51053-0025
PO BOX 26, SCHALLER, IA 51053-0026
PO BOX 27, SCHALLER, IA 51053-0027
PO BOX 28, SCHALLER, IA 51053-0028
PO BOX 29, SCHALLER, IA 51053-0029
PO BOX 30, SCHALLER, IA 51053-0030
PO BOX 31, SCHALLER, IA 51053-0031
PO BOX 32, SCHALLER, IA 51053-0032
PO BOX 33, SCHALLER, IA 51053-0033
PO BOX 34, SCHALLER, IA 51053-0034
PO BOX 35, SCHALLER, IA 51053-0035
PO BOX 36, SCHALLER, IA 51053-0036
PO BOX 37, SCHALLER, IA 51053-0037
PO BOX 38, SCHALLER, IA 51053-0038
PO BOX 39, SCHALLER, IA 51053-0039
PO BOX 40, SCHALLER, IA 51053-0040
PO BOX 41, SCHALLER, IA 51053-0041
PO BOX 42, SCHALLER, IA 51053-0042
PO BOX 43, SCHALLER, IA 51053-0043
PO BOX 44, SCHALLER, IA 51053-0044
PO BOX 45, SCHALLER, IA 51053-0045
PO BOX 46, SCHALLER, IA 51053-0046
PO BOX 47, SCHALLER, IA 51053-0047
PO BOX 48, SCHALLER, IA 51053-0048
PO BOX 49, SCHALLER, IA 51053-0049
PO BOX 50, SCHALLER, IA 51053-0050
PO BOX 51, SCHALLER, IA 51053-0051
PO BOX 52, SCHALLER, IA 51053-0052
PO BOX 53, SCHALLER, IA 51053-0053
PO BOX 54, SCHALLER, IA 51053-0054
PO BOX 55, SCHALLER, IA 51053-0055
PO BOX 56, SCHALLER, IA 51053-0056
PO BOX 57, SCHALLER, IA 51053-0057
PO BOX 58, SCHALLER, IA 51053-0058
PO BOX 59, SCHALLER, IA 51053-0059
PO BOX 60, SCHALLER, IA 51053-0060
PO BOX 61, SCHALLER, IA 51053-0061
PO BOX 62, SCHALLER, IA 51053-0062
PO BOX 63, SCHALLER, IA 51053-0063
PO BOX 64, SCHALLER, IA 51053-0064
PO BOX 65, SCHALLER, IA 51053-0065
PO BOX 66, SCHALLER, IA 51053-0066
PO BOX 67, SCHALLER, IA 51053-0067
PO BOX 68, SCHALLER, IA 51053-0068
PO BOX 69, SCHALLER, IA 51053-0069
PO BOX 70, SCHALLER, IA 51053-0070
PO BOX 71, SCHALLER, IA 51053-0071
PO BOX 72, SCHALLER, IA 51053-0072
PO BOX 73, SCHALLER, IA 51053-0073
PO BOX 74, SCHALLER, IA 51053-0074
PO BOX 75, SCHALLER, IA 51053-0075
PO BOX 76, SCHALLER, IA 51053-0076
PO BOX 77, SCHALLER, IA 51053-0077
PO BOX 78, SCHALLER, IA 51053-0078
PO BOX 79, SCHALLER, IA 51053-0079
PO BOX 80, SCHALLER, IA 51053-0080
PO BOX 81, SCHALLER, IA 51053-0081
PO BOX 82, SCHALLER, IA 51053-0082
PO BOX 83, SCHALLER, IA 51053-0083
PO BOX 84, SCHALLER, IA 51053-0084
PO BOX 85, SCHALLER, IA 51053-0085
PO BOX 86, SCHALLER, IA 51053-0086
PO BOX 87, SCHALLER, IA 51053-0087
PO BOX 88, SCHALLER, IA 51053-0088
PO BOX 89, SCHALLER, IA 51053-0089
PO BOX 90, SCHALLER, IA 51053-0090
PO BOX 91, SCHALLER, IA 51053-0091
PO BOX 92, SCHALLER, IA 51053-0092
PO BOX 93, SCHALLER, IA 51053-0093
PO BOX 94, SCHALLER, IA 51053-0094
PO BOX 95, SCHALLER, IA 51053-0095
PO BOX 96, SCHALLER, IA 51053-0096
PO BOX 97, SCHALLER, IA 51053-0097
PO BOX 98, SCHALLER, IA 51053-0098
PO BOX 99, SCHALLER, IA 51053-0099
PO BOX 100, SCHALLER, IA 51053-0100
PO BOX 101, SCHALLER, IA 51053-0101
PO BOX 102, SCHALLER, IA 51053-0102
PO BOX 103, SCHALLER, IA 51053-0103
PO BOX 104, SCHALLER, IA 51053-0104
PO BOX 105, SCHALLER, IA 51053-0105
PO BOX 106, SCHALLER, IA 51053-0106
PO BOX 107, SCHALLER, IA 51053-0107
PO BOX 108, SCHALLER, IA 51053-0108
PO BOX 109, SCHALLER, IA 51053-0109
PO BOX 110, SCHALLER, IA 51053-0110
PO BOX 111, SCHALLER, IA 51053-0111
PO BOX 112, SCHALLER, IA 51053-0112
PO BOX 113, SCHALLER, IA 51053-0113
PO BOX 114, SCHALLER, IA 51053-0114
PO BOX 115, SCHALLER, IA 51053-0115
PO BOX 116, SCHALLER, IA 51053-0116
PO BOX 117, SCHALLER, IA 51053-0117
PO BOX 118, SCHALLER, IA 51053-0118
PO BOX 119, SCHALLER, IA 51053-0119
PO BOX 120, SCHALLER, IA 51053-0120
PO BOX 121, SCHALLER, IA 51053-0121
PO BOX 122, SCHALLER, IA 51053-0122
PO BOX 123, SCHALLER, IA 51053-0123
PO BOX 124, SCHALLER, IA 51053-0124
PO BOX 125, SCHALLER, IA 51053-0125
PO BOX 126, SCHALLER, IA 51053-0126
PO BOX 127, SCHALLER, IA 51053-0127
PO BOX 128, SCHALLER, IA 51053-0128
PO BOX 129, SCHALLER, IA 51053-0129
PO BOX 130, SCHALLER, IA 51053-0130
PO BOX 131, SCHALLER, IA 51053-0131
PO BOX 132, SCHALLER, IA 51053-0132
PO BOX 133, SCHALLER, IA 51053-0133
PO BOX 134, SCHALLER, IA 51053-0134
PO BOX 135, SCHALLER, IA 51053-0135
PO BOX 136, SCHALLER, IA 51053-0136
PO BOX 137, SCHALLER, IA 51053-0137
PO BOX 138, SCHALLER, IA 51053-0138
PO BOX 139, SCHALLER, IA 51053-0139
PO BOX 140, SCHALLER, IA 51053-0140
PO BOX 141, SCHALLER, IA 51053-0141
PO BOX 142, SCHALLER, IA 51053-0142
PO BOX 143, SCHALLER, IA 51053-0143
PO BOX 144, SCHALLER, IA 51053-0144
PO BOX 145, SCHALLER, IA 51053-0145
PO BOX 146, SCHALLER, IA 51053-0146
PO BOX 147, SCHALLER, IA 51053-0147
PO BOX 148, SCHALLER, IA 51053-0148
PO BOX 149, SCHALLER, IA 51053-0149
PO BOX 150, SCHALLER, IA 51053-0150
PO BOX 151, SCHALLER, IA 51053-0151
PO BOX 152, SCHALLER, IA 51053-0152
PO BOX 153, SCHALLER, IA 51053-0153
PO BOX 154, SCHALLER, IA 51053-0154
PO BOX 155, SCHALLER, IA 51053-0155
PO BOX 156, SCHALLER, IA 51053-0156
PO BOX 157, SCHALLER, IA 51053-0157
PO BOX 158, SCHALLER, IA 51053-0158
PO BOX 159, SCHALLER, IA 51053-0159
PO BOX 160, SCHALLER, IA 51053-0160
PO BOX 161, SCHALLER, IA 51053-0161
PO BOX 162, SCHALLER, IA 51053-0162
PO BOX 163, SCHALLER, IA 51053-0163
PO BOX 164, SCHALLER, IA 51053-0164
PO BOX 165, SCHALLER, IA 51053-0165
PO BOX 166, SCHALLER, IA 51053-0166
PO BOX 167, SCHALLER, IA 51053-0167
PO BOX 168, SCHALLER, IA 51053-0168
PO BOX 169, SCHALLER, IA 51053-0169
PO BOX 170, SCHALLER, IA 51053-0170
PO BOX 171, SCHALLER, IA 51053-0171
PO BOX 172, SCHALLER, IA 51053-0172
PO BOX 173, SCHALLER, IA 51053-0173
PO BOX 174, SCHALLER, IA 51053-0174
PO BOX 175, SCHALLER, IA 51053-0175
PO BOX 176, SCHALLER, IA 51053-0176
PO BOX 177, SCHALLER, IA 51053-0177
PO BOX 178, SCHALLER, IA 51053-0178
PO BOX 179, SCHALLER, IA 51053-0179
PO BOX 180, SCHALLER, IA 51053-0180
PO BOX 181, SCHALLER, IA 51053-0181
PO BOX 182, SCHALLER, IA 51053-0182
PO BOX 183, SCHALLER, IA 51053-0183
PO BOX 184, SCHALLER, IA 51053-0184
PO BOX 185, SCHALLER, IA 51053-0185
PO BOX 186, SCHALLER, IA 51053-0186
PO BOX 187, SCHALLER, IA 51053-0187
PO BOX 188, SCHALLER, IA 51053-0188
PO BOX 189, SCHALLER, IA 51053-0189
PO BOX 190, SCHALLER, IA 51053-0190
PO BOX 191, SCHALLER, IA 51053-0191
PO BOX 192, SCHALLER, IA 51053-0192
PO BOX 193, SCHALLER, IA 51053-0193
PO BOX 194, SCHALLER, IA 51053-0194
PO BOX 195, SCHALLER, IA 51053-0195
PO BOX 196, SCHALLER, IA 51053-0196
PO BOX 197, SCHALLER, IA 51053-0197
PO BOX 198, SCHALLER, IA 51053-0198
PO BOX 199, SCHALLER, IA 51053-0199
PO BOX 200, SCHALLER, IA 51053-0200
PO BOX 201, SCHALLER, IA 51053-0201
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