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, POSTVILLE, IA 52162-0001
PO BOX 2, POSTVILLE, IA 52162-0002
PO BOX 3, POSTVILLE, IA 52162-0003
PO BOX 4, POSTVILLE, IA 52162-0004
PO BOX 5, POSTVILLE, IA 52162-0005
PO BOX 6, POSTVILLE, IA 52162-0006
PO BOX 7, POSTVILLE, IA 52162-0007
PO BOX 8, POSTVILLE, IA 52162-0008
PO BOX 9, POSTVILLE, IA 52162-0009
PO BOX 10, POSTVILLE, IA 52162-0010
PO BOX 11, POSTVILLE, IA 52162-0011
PO BOX 12, POSTVILLE, IA 52162-0012
PO BOX 13, POSTVILLE, IA 52162-0013
PO BOX 14, POSTVILLE, IA 52162-0014
PO BOX 15, POSTVILLE, IA 52162-0015
PO BOX 16, POSTVILLE, IA 52162-0016
PO BOX 17, POSTVILLE, IA 52162-0017
PO BOX 18, POSTVILLE, IA 52162-0018
PO BOX 19, POSTVILLE, IA 52162-0019
PO BOX 20, POSTVILLE, IA 52162-0020
PO BOX 21, POSTVILLE, IA 52162-0021
PO BOX 22, POSTVILLE, IA 52162-0022
PO BOX 23, POSTVILLE, IA 52162-0023
PO BOX 24, POSTVILLE, IA 52162-0024
PO BOX 25, POSTVILLE, IA 52162-0025
PO BOX 26, POSTVILLE, IA 52162-0026
PO BOX 27, POSTVILLE, IA 52162-0027
PO BOX 28, POSTVILLE, IA 52162-0028
PO BOX 29, POSTVILLE, IA 52162-0029
PO BOX 30, POSTVILLE, IA 52162-0030
PO BOX 31, POSTVILLE, IA 52162-0031
PO BOX 32, POSTVILLE, IA 52162-0032
PO BOX 33, POSTVILLE, IA 52162-0033
PO BOX 34, POSTVILLE, IA 52162-0034
PO BOX 35, POSTVILLE, IA 52162-0035
PO BOX 36, POSTVILLE, IA 52162-0036
PO BOX 37, POSTVILLE, IA 52162-0037
PO BOX 38, POSTVILLE, IA 52162-0038
PO BOX 39, POSTVILLE, IA 52162-0039
PO BOX 40, POSTVILLE, IA 52162-0040
PO BOX 41, POSTVILLE, IA 52162-0041
PO BOX 42, POSTVILLE, IA 52162-0042
PO BOX 43, POSTVILLE, IA 52162-0043
PO BOX 44, POSTVILLE, IA 52162-0044
PO BOX 45, POSTVILLE, IA 52162-0045
PO BOX 46, POSTVILLE, IA 52162-0046
PO BOX 47, POSTVILLE, IA 52162-0047
PO BOX 48, POSTVILLE, IA 52162-0048
PO BOX 49, POSTVILLE, IA 52162-0049
PO BOX 50, POSTVILLE, IA 52162-0050
PO BOX 51, POSTVILLE, IA 52162-0051
PO BOX 52, POSTVILLE, IA 52162-0052
PO BOX 53, POSTVILLE, IA 52162-0053
PO BOX 54, POSTVILLE, IA 52162-0054
PO BOX 55, POSTVILLE, IA 52162-0055
PO BOX 56, POSTVILLE, IA 52162-0056
PO BOX 57, POSTVILLE, IA 52162-0057
PO BOX 58, POSTVILLE, IA 52162-0058
PO BOX 59, POSTVILLE, IA 52162-0059
PO BOX 60, POSTVILLE, IA 52162-0060
PO BOX 61, POSTVILLE, IA 52162-0061
PO BOX 62, POSTVILLE, IA 52162-0062
PO BOX 63, POSTVILLE, IA 52162-0063
PO BOX 64, POSTVILLE, IA 52162-0064
PO BOX 65, POSTVILLE, IA 52162-0065
PO BOX 66, POSTVILLE, IA 52162-0066
PO BOX 67, POSTVILLE, IA 52162-0067
PO BOX 68, POSTVILLE, IA 52162-0068
PO BOX 69, POSTVILLE, IA 52162-0069
PO BOX 70, POSTVILLE, IA 52162-0070
PO BOX 71, POSTVILLE, IA 52162-0071
PO BOX 72, POSTVILLE, IA 52162-0072
PO BOX 73, POSTVILLE, IA 52162-0073
PO BOX 74, POSTVILLE, IA 52162-0074
PO BOX 75, POSTVILLE, IA 52162-0075
PO BOX 76, POSTVILLE, IA 52162-0076
PO BOX 77, POSTVILLE, IA 52162-0077
PO BOX 78, POSTVILLE, IA 52162-0078
PO BOX 79, POSTVILLE, IA 52162-0079
PO BOX 80, POSTVILLE, IA 52162-0080
PO BOX 81, POSTVILLE, IA 52162-0081
PO BOX 82, POSTVILLE, IA 52162-0082
PO BOX 83, POSTVILLE, IA 52162-0083
PO BOX 84, POSTVILLE, IA 52162-0084
PO BOX 85, POSTVILLE, IA 52162-0085
PO BOX 86, POSTVILLE, IA 52162-0086
PO BOX 87, POSTVILLE, IA 52162-0087
PO BOX 88, POSTVILLE, IA 52162-0088
PO BOX 89, POSTVILLE, IA 52162-0089
PO BOX 90, POSTVILLE, IA 52162-0090
PO BOX 91, POSTVILLE, IA 52162-0091
PO BOX 92, POSTVILLE, IA 52162-0092
PO BOX 93, POSTVILLE, IA 52162-0093
PO BOX 94, POSTVILLE, IA 52162-0094
PO BOX 95, POSTVILLE, IA 52162-0095
PO BOX 96, POSTVILLE, IA 52162-0096
PO BOX 97, POSTVILLE, IA 52162-0097
PO BOX 98, POSTVILLE, IA 52162-0098
PO BOX 99, POSTVILLE, IA 52162-0099
PO BOX 100, POSTVILLE, IA 52162-0100
PO BOX 101, POSTVILLE, IA 52162-0101
PO BOX 102, POSTVILLE, IA 52162-0102
PO BOX 103, POSTVILLE, IA 52162-0103
PO BOX 104, POSTVILLE, IA 52162-0104
PO BOX 105, POSTVILLE, IA 52162-0105
PO BOX 106, POSTVILLE, IA 52162-0106
PO BOX 107, POSTVILLE, IA 52162-0107
PO BOX 108, POSTVILLE, IA 52162-0108
PO BOX 109, POSTVILLE, IA 52162-0109
PO BOX 110, POSTVILLE, IA 52162-0110
PO BOX 111, POSTVILLE, IA 52162-0111
PO BOX 112, POSTVILLE, IA 52162-0112
PO BOX 113, POSTVILLE, IA 52162-0113
PO BOX 114, POSTVILLE, IA 52162-0114
PO BOX 115, POSTVILLE, IA 52162-0115
PO BOX 116, POSTVILLE, IA 52162-0116
PO BOX 117, POSTVILLE, IA 52162-0117
PO BOX 118, POSTVILLE, IA 52162-0118
PO BOX 119, POSTVILLE, IA 52162-0119
PO BOX 120, POSTVILLE, IA 52162-0120
PO BOX 121, POSTVILLE, IA 52162-0121
PO BOX 122, POSTVILLE, IA 52162-0122
PO BOX 123, POSTVILLE, IA 52162-0123
PO BOX 124, POSTVILLE, IA 52162-0124
PO BOX 125, POSTVILLE, IA 52162-0125
PO BOX 126, POSTVILLE, IA 52162-0126
PO BOX 127, POSTVILLE, IA 52162-0127
PO BOX 128, POSTVILLE, IA 52162-0128
PO BOX 129, POSTVILLE, IA 52162-0129
PO BOX 130, POSTVILLE, IA 52162-0130
PO BOX 131, POSTVILLE, IA 52162-0131
PO BOX 132, POSTVILLE, IA 52162-0132
PO BOX 133, POSTVILLE, IA 52162-0133
PO BOX 134, POSTVILLE, IA 52162-0134
PO BOX 135, POSTVILLE, IA 52162-0135
PO BOX 136, POSTVILLE, IA 52162-0136
PO BOX 137, POSTVILLE, IA 52162-0137
PO BOX 138, POSTVILLE, IA 52162-0138
PO BOX 139, POSTVILLE, IA 52162-0139
PO BOX 140, POSTVILLE, IA 52162-0140
PO BOX 141, POSTVILLE, IA 52162-0141
PO BOX 142, POSTVILLE, IA 52162-0142
PO BOX 143, POSTVILLE, IA 52162-0143
PO BOX 144, POSTVILLE, IA 52162-0144
PO BOX 145, POSTVILLE, IA 52162-0145
PO BOX 146, POSTVILLE, IA 52162-0146
PO BOX 147, POSTVILLE, IA 52162-0147
PO BOX 148, POSTVILLE, IA 52162-0148
PO BOX 149, POSTVILLE, IA 52162-0149
PO BOX 150, POSTVILLE, IA 52162-0150
PO BOX 151, POSTVILLE, IA 52162-0151
PO BOX 152, POSTVILLE, IA 52162-0152
PO BOX 153, POSTVILLE, IA 52162-0153
PO BOX 154, POSTVILLE, IA 52162-0154
PO BOX 155, POSTVILLE, IA 52162-0155
PO BOX 156, POSTVILLE, IA 52162-0156
PO BOX 157, POSTVILLE, IA 52162-0157
PO BOX 158, POSTVILLE, IA 52162-0158
PO BOX 159, POSTVILLE, IA 52162-0159
PO BOX 160, POSTVILLE, IA 52162-0160
PO BOX 161, POSTVILLE, IA 52162-0161
PO BOX 162, POSTVILLE, IA 52162-0162
PO BOX 163, POSTVILLE, IA 52162-0163
PO BOX 164, POSTVILLE, IA 52162-0164
PO BOX 165, POSTVILLE, IA 52162-0165
PO BOX 166, POSTVILLE, IA 52162-0166
PO BOX 167, POSTVILLE, IA 52162-0167
PO BOX 168, POSTVILLE, IA 52162-0168
PO BOX 169, POSTVILLE, IA 52162-0169
PO BOX 170, POSTVILLE, IA 52162-0170
PO BOX 171, POSTVILLE, IA 52162-0171
PO BOX 172, POSTVILLE, IA 52162-0172
PO BOX 173, POSTVILLE, IA 52162-0173
PO BOX 174, POSTVILLE, IA 52162-0174
PO BOX 175, POSTVILLE, IA 52162-0175
PO BOX 176, POSTVILLE, IA 52162-0176
PO BOX 177, POSTVILLE, IA 52162-0177
PO BOX 178, POSTVILLE, IA 52162-0178
PO BOX 179, POSTVILLE, IA 52162-0179
PO BOX 180, POSTVILLE, IA 52162-0180
PO BOX 181, POSTVILLE, IA 52162-0181
PO BOX 182, POSTVILLE, IA 52162-0182
PO BOX 183, POSTVILLE, IA 52162-0183
PO BOX 184, POSTVILLE, IA 52162-0184
PO BOX 185, POSTVILLE, IA 52162-0185
PO BOX 186, POSTVILLE, IA 52162-0186
PO BOX 187, POSTVILLE, IA 52162-0187
PO BOX 188, POSTVILLE, IA 52162-0188
PO BOX 189, POSTVILLE, IA 52162-0189
PO BOX 190, POSTVILLE, IA 52162-0190
PO BOX 191, POSTVILLE, IA 52162-0191
PO BOX 192, POSTVILLE, IA 52162-0192
PO BOX 193, POSTVILLE, IA 52162-0193
PO BOX 194, POSTVILLE, IA 52162-0194
PO BOX 195, POSTVILLE, IA 52162-0195
PO BOX 196, POSTVILLE, IA 52162-0196
PO BOX 197, POSTVILLE, IA 52162-0197
PO BOX 198, POSTVILLE, IA 52162-0198
PO BOX 199, POSTVILLE, IA 52162-0199
PO BOX 200, POSTVILLE, IA 52162-0200
PO BOX 201, POSTVILLE, IA 52162-0201
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