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, OXFORD JUNCTION, IA 52323-0001
PO BOX 2, OXFORD JUNCTION, IA 52323-0002
PO BOX 3, OXFORD JUNCTION, IA 52323-0003
PO BOX 4, OXFORD JUNCTION, IA 52323-0004
PO BOX 5, OXFORD JUNCTION, IA 52323-0005
PO BOX 6, OXFORD JUNCTION, IA 52323-0006
PO BOX 7, OXFORD JUNCTION, IA 52323-0007
PO BOX 8, OXFORD JUNCTION, IA 52323-0008
PO BOX 9, OXFORD JUNCTION, IA 52323-0009
PO BOX 10, OXFORD JUNCTION, IA 52323-0010
PO BOX 11, OXFORD JUNCTION, IA 52323-0011
PO BOX 12, OXFORD JUNCTION, IA 52323-0012
PO BOX 13, OXFORD JUNCTION, IA 52323-0013
PO BOX 14, OXFORD JUNCTION, IA 52323-0014
PO BOX 15, OXFORD JUNCTION, IA 52323-0015
PO BOX 16, OXFORD JUNCTION, IA 52323-0016
PO BOX 17, OXFORD JUNCTION, IA 52323-0017
PO BOX 18, OXFORD JUNCTION, IA 52323-0018
PO BOX 19, OXFORD JUNCTION, IA 52323-0019
PO BOX 20, OXFORD JUNCTION, IA 52323-0020
PO BOX 21, OXFORD JUNCTION, IA 52323-0021
PO BOX 22, OXFORD JUNCTION, IA 52323-0022
PO BOX 23, OXFORD JUNCTION, IA 52323-0023
PO BOX 24, OXFORD JUNCTION, IA 52323-0024
PO BOX 25, OXFORD JUNCTION, IA 52323-0025
PO BOX 26, OXFORD JUNCTION, IA 52323-0026
PO BOX 27, OXFORD JUNCTION, IA 52323-0027
PO BOX 28, OXFORD JUNCTION, IA 52323-0028
PO BOX 29, OXFORD JUNCTION, IA 52323-0029
PO BOX 30, OXFORD JUNCTION, IA 52323-0030
PO BOX 31, OXFORD JUNCTION, IA 52323-0031
PO BOX 32, OXFORD JUNCTION, IA 52323-0032
PO BOX 33, OXFORD JUNCTION, IA 52323-0033
PO BOX 34, OXFORD JUNCTION, IA 52323-0034
PO BOX 35, OXFORD JUNCTION, IA 52323-0035
PO BOX 36, OXFORD JUNCTION, IA 52323-0036
PO BOX 37, OXFORD JUNCTION, IA 52323-0037
PO BOX 38, OXFORD JUNCTION, IA 52323-0038
PO BOX 39, OXFORD JUNCTION, IA 52323-0039
PO BOX 40, OXFORD JUNCTION, IA 52323-0040
PO BOX 41, OXFORD JUNCTION, IA 52323-0041
PO BOX 42, OXFORD JUNCTION, IA 52323-0042
PO BOX 43, OXFORD JUNCTION, IA 52323-0043
PO BOX 44, OXFORD JUNCTION, IA 52323-0044
PO BOX 45, OXFORD JUNCTION, IA 52323-0045
PO BOX 46, OXFORD JUNCTION, IA 52323-0046
PO BOX 47, OXFORD JUNCTION, IA 52323-0047
PO BOX 48, OXFORD JUNCTION, IA 52323-0048
PO BOX 49, OXFORD JUNCTION, IA 52323-0049
PO BOX 50, OXFORD JUNCTION, IA 52323-0050
PO BOX 51, OXFORD JUNCTION, IA 52323-0051
PO BOX 52, OXFORD JUNCTION, IA 52323-0052
PO BOX 53, OXFORD JUNCTION, IA 52323-0053
PO BOX 54, OXFORD JUNCTION, IA 52323-0054
PO BOX 55, OXFORD JUNCTION, IA 52323-0055
PO BOX 56, OXFORD JUNCTION, IA 52323-0056
PO BOX 57, OXFORD JUNCTION, IA 52323-0057
PO BOX 58, OXFORD JUNCTION, IA 52323-0058
PO BOX 59, OXFORD JUNCTION, IA 52323-0059
PO BOX 60, OXFORD JUNCTION, IA 52323-0060
PO BOX 61, OXFORD JUNCTION, IA 52323-0061
PO BOX 62, OXFORD JUNCTION, IA 52323-0062
PO BOX 63, OXFORD JUNCTION, IA 52323-0063
PO BOX 64, OXFORD JUNCTION, IA 52323-0064
PO BOX 65, OXFORD JUNCTION, IA 52323-0065
PO BOX 66, OXFORD JUNCTION, IA 52323-0066
PO BOX 67, OXFORD JUNCTION, IA 52323-0067
PO BOX 68, OXFORD JUNCTION, IA 52323-0068
PO BOX 69, OXFORD JUNCTION, IA 52323-0069
PO BOX 70, OXFORD JUNCTION, IA 52323-0070
PO BOX 71, OXFORD JUNCTION, IA 52323-0071
PO BOX 72, OXFORD JUNCTION, IA 52323-0072
PO BOX 73, OXFORD JUNCTION, IA 52323-0073
PO BOX 74, OXFORD JUNCTION, IA 52323-0074
PO BOX 75, OXFORD JUNCTION, IA 52323-0075
PO BOX 76, OXFORD JUNCTION, IA 52323-0076
PO BOX 77, OXFORD JUNCTION, IA 52323-0077
PO BOX 78, OXFORD JUNCTION, IA 52323-0078
PO BOX 79, OXFORD JUNCTION, IA 52323-0079
PO BOX 80, OXFORD JUNCTION, IA 52323-0080
PO BOX 81, OXFORD JUNCTION, IA 52323-0081
PO BOX 82, OXFORD JUNCTION, IA 52323-0082
PO BOX 83, OXFORD JUNCTION, IA 52323-0083
PO BOX 84, OXFORD JUNCTION, IA 52323-0084
PO BOX 85, OXFORD JUNCTION, IA 52323-0085
PO BOX 86, OXFORD JUNCTION, IA 52323-0086
PO BOX 87, OXFORD JUNCTION, IA 52323-0087
PO BOX 88, OXFORD JUNCTION, IA 52323-0088
PO BOX 89, OXFORD JUNCTION, IA 52323-0089
PO BOX 90, OXFORD JUNCTION, IA 52323-0090
PO BOX 91, OXFORD JUNCTION, IA 52323-0091
PO BOX 92, OXFORD JUNCTION, IA 52323-0092
PO BOX 93, OXFORD JUNCTION, IA 52323-0093
PO BOX 94, OXFORD JUNCTION, IA 52323-0094
PO BOX 95, OXFORD JUNCTION, IA 52323-0095
PO BOX 96, OXFORD JUNCTION, IA 52323-0096
PO BOX 97, OXFORD JUNCTION, IA 52323-0097
PO BOX 98, OXFORD JUNCTION, IA 52323-0098
PO BOX 99, OXFORD JUNCTION, IA 52323-0099
PO BOX 100, OXFORD JUNCTION, IA 52323-0100
PO BOX 101, OXFORD JUNCTION, IA 52323-0101
PO BOX 102, OXFORD JUNCTION, IA 52323-0102
PO BOX 103, OXFORD JUNCTION, IA 52323-0103
PO BOX 104, OXFORD JUNCTION, IA 52323-0104
PO BOX 105, OXFORD JUNCTION, IA 52323-0105
PO BOX 106, OXFORD JUNCTION, IA 52323-0106
PO BOX 107, OXFORD JUNCTION, IA 52323-0107
PO BOX 108, OXFORD JUNCTION, IA 52323-0108
PO BOX 109, OXFORD JUNCTION, IA 52323-0109
PO BOX 110, OXFORD JUNCTION, IA 52323-0110
PO BOX 111, OXFORD JUNCTION, IA 52323-0111
PO BOX 112, OXFORD JUNCTION, IA 52323-0112
PO BOX 113, OXFORD JUNCTION, IA 52323-0113
PO BOX 114, OXFORD JUNCTION, IA 52323-0114
PO BOX 115, OXFORD JUNCTION, IA 52323-0115
PO BOX 116, OXFORD JUNCTION, IA 52323-0116
PO BOX 117, OXFORD JUNCTION, IA 52323-0117
PO BOX 118, OXFORD JUNCTION, IA 52323-0118
PO BOX 119, OXFORD JUNCTION, IA 52323-0119
PO BOX 120, OXFORD JUNCTION, IA 52323-0120
PO BOX 121, OXFORD JUNCTION, IA 52323-0121
PO BOX 122, OXFORD JUNCTION, IA 52323-0122
PO BOX 123, OXFORD JUNCTION, IA 52323-0123
PO BOX 124, OXFORD JUNCTION, IA 52323-0124
PO BOX 125, OXFORD JUNCTION, IA 52323-0125
PO BOX 126, OXFORD JUNCTION, IA 52323-0126
PO BOX 127, OXFORD JUNCTION, IA 52323-0127
PO BOX 128, OXFORD JUNCTION, IA 52323-0128
PO BOX 129, OXFORD JUNCTION, IA 52323-0129
PO BOX 130, OXFORD JUNCTION, IA 52323-0130
PO BOX 131, OXFORD JUNCTION, IA 52323-0131
PO BOX 132, OXFORD JUNCTION, IA 52323-0132
PO BOX 133, OXFORD JUNCTION, IA 52323-0133
PO BOX 134, OXFORD JUNCTION, IA 52323-0134
PO BOX 135, OXFORD JUNCTION, IA 52323-0135
PO BOX 136, OXFORD JUNCTION, IA 52323-0136
PO BOX 137, OXFORD JUNCTION, IA 52323-0137
PO BOX 138, OXFORD JUNCTION, IA 52323-0138
PO BOX 139, OXFORD JUNCTION, IA 52323-0139
PO BOX 140, OXFORD JUNCTION, IA 52323-0140
PO BOX 141, OXFORD JUNCTION, IA 52323-0141
PO BOX 142, OXFORD JUNCTION, IA 52323-0142
PO BOX 143, OXFORD JUNCTION, IA 52323-0143
PO BOX 144, OXFORD JUNCTION, IA 52323-0144
PO BOX 145, OXFORD JUNCTION, IA 52323-0145
PO BOX 146, OXFORD JUNCTION, IA 52323-0146
PO BOX 147, OXFORD JUNCTION, IA 52323-0147
PO BOX 148, OXFORD JUNCTION, IA 52323-0148
PO BOX 149, OXFORD JUNCTION, IA 52323-0149
PO BOX 150, OXFORD JUNCTION, IA 52323-0150
PO BOX 151, OXFORD JUNCTION, IA 52323-0151
PO BOX 152, OXFORD JUNCTION, IA 52323-0152
PO BOX 153, OXFORD JUNCTION, IA 52323-0153
PO BOX 154, OXFORD JUNCTION, IA 52323-0154
PO BOX 155, OXFORD JUNCTION, IA 52323-0155
PO BOX 156, OXFORD JUNCTION, IA 52323-0156
PO BOX 157, OXFORD JUNCTION, IA 52323-0157
PO BOX 158, OXFORD JUNCTION, IA 52323-0158
PO BOX 159, OXFORD JUNCTION, IA 52323-0159
PO BOX 160, OXFORD JUNCTION, IA 52323-0160
PO BOX 161, OXFORD JUNCTION, IA 52323-0161
PO BOX 162, OXFORD JUNCTION, IA 52323-0162
PO BOX 163, OXFORD JUNCTION, IA 52323-0163
PO BOX 164, OXFORD JUNCTION, IA 52323-0164
PO BOX 165, OXFORD JUNCTION, IA 52323-0165
PO BOX 166, OXFORD JUNCTION, IA 52323-0166
PO BOX 167, OXFORD JUNCTION, IA 52323-0167
PO BOX 168, OXFORD JUNCTION, IA 52323-0168
PO BOX 169, OXFORD JUNCTION, IA 52323-0169
PO BOX 170, OXFORD JUNCTION, IA 52323-0170
PO BOX 171, OXFORD JUNCTION, IA 52323-0171
PO BOX 172, OXFORD JUNCTION, IA 52323-0172
PO BOX 173, OXFORD JUNCTION, IA 52323-0173
PO BOX 174, OXFORD JUNCTION, IA 52323-0174
PO BOX 175, OXFORD JUNCTION, IA 52323-0175
PO BOX 176, OXFORD JUNCTION, IA 52323-0176
PO BOX 177, OXFORD JUNCTION, IA 52323-0177
PO BOX 178, OXFORD JUNCTION, IA 52323-0178
PO BOX 179, OXFORD JUNCTION, IA 52323-0179
PO BOX 180, OXFORD JUNCTION, IA 52323-0180
PO BOX 181, OXFORD JUNCTION, IA 52323-0181
PO BOX 182, OXFORD JUNCTION, IA 52323-0182
PO BOX 183, OXFORD JUNCTION, IA 52323-0183
PO BOX 184, OXFORD JUNCTION, IA 52323-0184
PO BOX 185, OXFORD JUNCTION, IA 52323-0185
PO BOX 186, OXFORD JUNCTION, IA 52323-0186
PO BOX 187, OXFORD JUNCTION, IA 52323-0187
PO BOX 188, OXFORD JUNCTION, IA 52323-0188
PO BOX 189, OXFORD JUNCTION, IA 52323-0189
PO BOX 190, OXFORD JUNCTION, IA 52323-0190
PO BOX 191, OXFORD JUNCTION, IA 52323-0191
PO BOX 192, OXFORD JUNCTION, IA 52323-0192
PO BOX 193, OXFORD JUNCTION, IA 52323-0193
PO BOX 194, OXFORD JUNCTION, IA 52323-0194
PO BOX 195, OXFORD JUNCTION, IA 52323-0195
PO BOX 196, OXFORD JUNCTION, IA 52323-0196
PO BOX 197, OXFORD JUNCTION, IA 52323-0197
PO BOX 198, OXFORD JUNCTION, IA 52323-0198
PO BOX 199, OXFORD JUNCTION, IA 52323-0199
PO BOX 200, OXFORD JUNCTION, IA 52323-0200
PO BOX 201, OXFORD JUNCTION, IA 52323-0201
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