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, POMEROY, IA 50575-0001
PO BOX 2, POMEROY, IA 50575-0002
PO BOX 3, POMEROY, IA 50575-0003
PO BOX 4, POMEROY, IA 50575-0004
PO BOX 5, POMEROY, IA 50575-0005
PO BOX 6, POMEROY, IA 50575-0006
PO BOX 7, POMEROY, IA 50575-0007
PO BOX 8, POMEROY, IA 50575-0008
PO BOX 9, POMEROY, IA 50575-0009
PO BOX 10, POMEROY, IA 50575-0010
PO BOX 11, POMEROY, IA 50575-0011
PO BOX 12, POMEROY, IA 50575-0012
PO BOX 13, POMEROY, IA 50575-0013
PO BOX 14, POMEROY, IA 50575-0014
PO BOX 15, POMEROY, IA 50575-0015
PO BOX 16, POMEROY, IA 50575-0016
PO BOX 17, POMEROY, IA 50575-0017
PO BOX 18, POMEROY, IA 50575-0018
PO BOX 19, POMEROY, IA 50575-0019
PO BOX 20, POMEROY, IA 50575-0020
PO BOX 21, POMEROY, IA 50575-0021
PO BOX 22, POMEROY, IA 50575-0022
PO BOX 23, POMEROY, IA 50575-0023
PO BOX 24, POMEROY, IA 50575-0024
PO BOX 25, POMEROY, IA 50575-0025
PO BOX 26, POMEROY, IA 50575-0026
PO BOX 27, POMEROY, IA 50575-0027
PO BOX 28, POMEROY, IA 50575-0028
PO BOX 29, POMEROY, IA 50575-0029
PO BOX 30, POMEROY, IA 50575-0030
PO BOX 31, POMEROY, IA 50575-0031
PO BOX 32, POMEROY, IA 50575-0032
PO BOX 33, POMEROY, IA 50575-0033
PO BOX 34, POMEROY, IA 50575-0034
PO BOX 35, POMEROY, IA 50575-0035
PO BOX 36, POMEROY, IA 50575-0036
PO BOX 37, POMEROY, IA 50575-0037
PO BOX 38, POMEROY, IA 50575-0038
PO BOX 39, POMEROY, IA 50575-0039
PO BOX 40, POMEROY, IA 50575-0040
PO BOX 41, POMEROY, IA 50575-0041
PO BOX 42, POMEROY, IA 50575-0042
PO BOX 43, POMEROY, IA 50575-0043
PO BOX 44, POMEROY, IA 50575-0044
PO BOX 45, POMEROY, IA 50575-0045
PO BOX 46, POMEROY, IA 50575-0046
PO BOX 47, POMEROY, IA 50575-0047
PO BOX 48, POMEROY, IA 50575-0048
PO BOX 49, POMEROY, IA 50575-0049
PO BOX 50, POMEROY, IA 50575-0050
PO BOX 51, POMEROY, IA 50575-0051
PO BOX 52, POMEROY, IA 50575-0052
PO BOX 53, POMEROY, IA 50575-0053
PO BOX 54, POMEROY, IA 50575-0054
PO BOX 55, POMEROY, IA 50575-0055
PO BOX 56, POMEROY, IA 50575-0056
PO BOX 57, POMEROY, IA 50575-0057
PO BOX 58, POMEROY, IA 50575-0058
PO BOX 59, POMEROY, IA 50575-0059
PO BOX 60, POMEROY, IA 50575-0060
PO BOX 61, POMEROY, IA 50575-0061
PO BOX 62, POMEROY, IA 50575-0062
PO BOX 63, POMEROY, IA 50575-0063
PO BOX 64, POMEROY, IA 50575-0064
PO BOX 65, POMEROY, IA 50575-0065
PO BOX 66, POMEROY, IA 50575-0066
PO BOX 67, POMEROY, IA 50575-0067
PO BOX 68, POMEROY, IA 50575-0068
PO BOX 69, POMEROY, IA 50575-0069
PO BOX 70, POMEROY, IA 50575-0070
PO BOX 71, POMEROY, IA 50575-0071
PO BOX 72, POMEROY, IA 50575-0072
PO BOX 73, POMEROY, IA 50575-0073
PO BOX 74, POMEROY, IA 50575-0074
PO BOX 75, POMEROY, IA 50575-0075
PO BOX 76, POMEROY, IA 50575-0076
PO BOX 77, POMEROY, IA 50575-0077
PO BOX 78, POMEROY, IA 50575-0078
PO BOX 79, POMEROY, IA 50575-0079
PO BOX 80, POMEROY, IA 50575-0080
PO BOX 81, POMEROY, IA 50575-0081
PO BOX 82, POMEROY, IA 50575-0082
PO BOX 83, POMEROY, IA 50575-0083
PO BOX 84, POMEROY, IA 50575-0084
PO BOX 85, POMEROY, IA 50575-0085
PO BOX 86, POMEROY, IA 50575-0086
PO BOX 87, POMEROY, IA 50575-0087
PO BOX 88, POMEROY, IA 50575-0088
PO BOX 89, POMEROY, IA 50575-0089
PO BOX 90, POMEROY, IA 50575-0090
PO BOX 91, POMEROY, IA 50575-0091
PO BOX 92, POMEROY, IA 50575-0092
PO BOX 93, POMEROY, IA 50575-0093
PO BOX 94, POMEROY, IA 50575-0094
PO BOX 95, POMEROY, IA 50575-0095
PO BOX 96, POMEROY, IA 50575-0096
PO BOX 97, POMEROY, IA 50575-0097
PO BOX 98, POMEROY, IA 50575-0098
PO BOX 99, POMEROY, IA 50575-0099
PO BOX 100, POMEROY, IA 50575-0100
PO BOX 101, POMEROY, IA 50575-0101
PO BOX 102, POMEROY, IA 50575-0102
PO BOX 103, POMEROY, IA 50575-0103
PO BOX 104, POMEROY, IA 50575-0104
PO BOX 105, POMEROY, IA 50575-0105
PO BOX 106, POMEROY, IA 50575-0106
PO BOX 107, POMEROY, IA 50575-0107
PO BOX 108, POMEROY, IA 50575-0108
PO BOX 109, POMEROY, IA 50575-0109
PO BOX 110, POMEROY, IA 50575-0110
PO BOX 111, POMEROY, IA 50575-0111
PO BOX 112, POMEROY, IA 50575-0112
PO BOX 113, POMEROY, IA 50575-0113
PO BOX 114, POMEROY, IA 50575-0114
PO BOX 115, POMEROY, IA 50575-0115
PO BOX 116, POMEROY, IA 50575-0116
PO BOX 117, POMEROY, IA 50575-0117
PO BOX 118, POMEROY, IA 50575-0118
PO BOX 119, POMEROY, IA 50575-0119
PO BOX 120, POMEROY, IA 50575-0120
PO BOX 121, POMEROY, IA 50575-0121
PO BOX 122, POMEROY, IA 50575-0122
PO BOX 123, POMEROY, IA 50575-0123
PO BOX 124, POMEROY, IA 50575-0124
PO BOX 125, POMEROY, IA 50575-0125
PO BOX 126, POMEROY, IA 50575-0126
PO BOX 127, POMEROY, IA 50575-0127
PO BOX 128, POMEROY, IA 50575-0128
PO BOX 129, POMEROY, IA 50575-0129
PO BOX 130, POMEROY, IA 50575-0130
PO BOX 131, POMEROY, IA 50575-0131
PO BOX 132, POMEROY, IA 50575-0132
PO BOX 133, POMEROY, IA 50575-0133
PO BOX 134, POMEROY, IA 50575-0134
PO BOX 135, POMEROY, IA 50575-0135
PO BOX 136, POMEROY, IA 50575-0136
PO BOX 137, POMEROY, IA 50575-0137
PO BOX 138, POMEROY, IA 50575-0138
PO BOX 139, POMEROY, IA 50575-0139
PO BOX 140, POMEROY, IA 50575-0140
PO BOX 141, POMEROY, IA 50575-0141
PO BOX 142, POMEROY, IA 50575-0142
PO BOX 143, POMEROY, IA 50575-0143
PO BOX 144, POMEROY, IA 50575-0144
PO BOX 145, POMEROY, IA 50575-0145
PO BOX 146, POMEROY, IA 50575-0146
PO BOX 147, POMEROY, IA 50575-0147
PO BOX 148, POMEROY, IA 50575-0148
PO BOX 149, POMEROY, IA 50575-0149
PO BOX 150, POMEROY, IA 50575-0150
PO BOX 151, POMEROY, IA 50575-0151
PO BOX 152, POMEROY, IA 50575-0152
PO BOX 153, POMEROY, IA 50575-0153
PO BOX 154, POMEROY, IA 50575-0154
PO BOX 155, POMEROY, IA 50575-0155
PO BOX 156, POMEROY, IA 50575-0156
PO BOX 157, POMEROY, IA 50575-0157
PO BOX 158, POMEROY, IA 50575-0158
PO BOX 159, POMEROY, IA 50575-0159
PO BOX 160, POMEROY, IA 50575-0160
PO BOX 161, POMEROY, IA 50575-0161
PO BOX 162, POMEROY, IA 50575-0162
PO BOX 163, POMEROY, IA 50575-0163
PO BOX 164, POMEROY, IA 50575-0164
PO BOX 165, POMEROY, IA 50575-0165
PO BOX 166, POMEROY, IA 50575-0166
PO BOX 167, POMEROY, IA 50575-0167
PO BOX 168, POMEROY, IA 50575-0168
PO BOX 169, POMEROY, IA 50575-0169
PO BOX 170, POMEROY, IA 50575-0170
PO BOX 171, POMEROY, IA 50575-0171
PO BOX 172, POMEROY, IA 50575-0172
PO BOX 173, POMEROY, IA 50575-0173
PO BOX 174, POMEROY, IA 50575-0174
PO BOX 175, POMEROY, IA 50575-0175
PO BOX 176, POMEROY, IA 50575-0176
PO BOX 177, POMEROY, IA 50575-0177
PO BOX 178, POMEROY, IA 50575-0178
PO BOX 179, POMEROY, IA 50575-0179
PO BOX 180, POMEROY, IA 50575-0180
PO BOX 181, POMEROY, IA 50575-0181
PO BOX 182, POMEROY, IA 50575-0182
PO BOX 183, POMEROY, IA 50575-0183
PO BOX 184, POMEROY, IA 50575-0184
PO BOX 185, POMEROY, IA 50575-0185
PO BOX 186, POMEROY, IA 50575-0186
PO BOX 187, POMEROY, IA 50575-0187
PO BOX 188, POMEROY, IA 50575-0188
PO BOX 189, POMEROY, IA 50575-0189
PO BOX 190, POMEROY, IA 50575-0190
PO BOX 191, POMEROY, IA 50575-0191
PO BOX 192, POMEROY, IA 50575-0192
PO BOX 193, POMEROY, IA 50575-0193
PO BOX 194, POMEROY, IA 50575-0194
PO BOX 195, POMEROY, IA 50575-0195
PO BOX 196, POMEROY, IA 50575-0196
PO BOX 197, POMEROY, IA 50575-0197
PO BOX 198, POMEROY, IA 50575-0198
PO BOX 199, POMEROY, IA 50575-0199
PO BOX 200, POMEROY, IA 50575-0200
PO BOX 201, POMEROY, IA 50575-0201
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