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, INDEPENDENCE, IA 50644-0001
PO BOX 2, INDEPENDENCE, IA 50644-0002
PO BOX 3, INDEPENDENCE, IA 50644-0003
PO BOX 4, INDEPENDENCE, IA 50644-0004
PO BOX 5, INDEPENDENCE, IA 50644-0005
PO BOX 6, INDEPENDENCE, IA 50644-0006
PO BOX 7, INDEPENDENCE, IA 50644-0007
PO BOX 8, INDEPENDENCE, IA 50644-0008
PO BOX 9, INDEPENDENCE, IA 50644-0009
PO BOX 10, INDEPENDENCE, IA 50644-0010
PO BOX 11, INDEPENDENCE, IA 50644-0011
PO BOX 12, INDEPENDENCE, IA 50644-0012
PO BOX 13, INDEPENDENCE, IA 50644-0013
PO BOX 14, INDEPENDENCE, IA 50644-0014
PO BOX 15, INDEPENDENCE, IA 50644-0015
PO BOX 16, INDEPENDENCE, IA 50644-0016
PO BOX 17, INDEPENDENCE, IA 50644-0017
PO BOX 18, INDEPENDENCE, IA 50644-0018
PO BOX 19, INDEPENDENCE, IA 50644-0019
PO BOX 20, INDEPENDENCE, IA 50644-0020
PO BOX 21, INDEPENDENCE, IA 50644-0021
PO BOX 22, INDEPENDENCE, IA 50644-0022
PO BOX 23, INDEPENDENCE, IA 50644-0023
PO BOX 24, INDEPENDENCE, IA 50644-0024
PO BOX 25, INDEPENDENCE, IA 50644-0025
PO BOX 26, INDEPENDENCE, IA 50644-0026
PO BOX 27, INDEPENDENCE, IA 50644-0027
PO BOX 28, INDEPENDENCE, IA 50644-0028
PO BOX 29, INDEPENDENCE, IA 50644-0029
PO BOX 30, INDEPENDENCE, IA 50644-0030
PO BOX 31, INDEPENDENCE, IA 50644-0031
PO BOX 32, INDEPENDENCE, IA 50644-0032
PO BOX 33, INDEPENDENCE, IA 50644-0033
PO BOX 34, INDEPENDENCE, IA 50644-0034
PO BOX 35, INDEPENDENCE, IA 50644-0035
PO BOX 36, INDEPENDENCE, IA 50644-0036
PO BOX 37, INDEPENDENCE, IA 50644-0037
PO BOX 38, INDEPENDENCE, IA 50644-0038
PO BOX 39, INDEPENDENCE, IA 50644-0039
PO BOX 40, INDEPENDENCE, IA 50644-0040
PO BOX 41, INDEPENDENCE, IA 50644-0041
PO BOX 42, INDEPENDENCE, IA 50644-0042
PO BOX 43, INDEPENDENCE, IA 50644-0043
PO BOX 44, INDEPENDENCE, IA 50644-0044
PO BOX 45, INDEPENDENCE, IA 50644-0045
PO BOX 46, INDEPENDENCE, IA 50644-0046
PO BOX 47, INDEPENDENCE, IA 50644-0047
PO BOX 48, INDEPENDENCE, IA 50644-0048
PO BOX 49, INDEPENDENCE, IA 50644-0049
PO BOX 50, INDEPENDENCE, IA 50644-0050
PO BOX 51, INDEPENDENCE, IA 50644-0051
PO BOX 52, INDEPENDENCE, IA 50644-0052
PO BOX 53, INDEPENDENCE, IA 50644-0053
PO BOX 54, INDEPENDENCE, IA 50644-0054
PO BOX 55, INDEPENDENCE, IA 50644-0055
PO BOX 56, INDEPENDENCE, IA 50644-0056
PO BOX 57, INDEPENDENCE, IA 50644-0057
PO BOX 58, INDEPENDENCE, IA 50644-0058
PO BOX 59, INDEPENDENCE, IA 50644-0059
PO BOX 60, INDEPENDENCE, IA 50644-0060
PO BOX 61, INDEPENDENCE, IA 50644-0061
PO BOX 62, INDEPENDENCE, IA 50644-0062
PO BOX 63, INDEPENDENCE, IA 50644-0063
PO BOX 64, INDEPENDENCE, IA 50644-0064
PO BOX 65, INDEPENDENCE, IA 50644-0065
PO BOX 66, INDEPENDENCE, IA 50644-0066
PO BOX 67, INDEPENDENCE, IA 50644-0067
PO BOX 68, INDEPENDENCE, IA 50644-0068
PO BOX 69, INDEPENDENCE, IA 50644-0069
PO BOX 70, INDEPENDENCE, IA 50644-0070
PO BOX 71, INDEPENDENCE, IA 50644-0071
PO BOX 72, INDEPENDENCE, IA 50644-0072
PO BOX 73, INDEPENDENCE, IA 50644-0073
PO BOX 74, INDEPENDENCE, IA 50644-0074
PO BOX 75, INDEPENDENCE, IA 50644-0075
PO BOX 76, INDEPENDENCE, IA 50644-0076
PO BOX 77, INDEPENDENCE, IA 50644-0077
PO BOX 78, INDEPENDENCE, IA 50644-0078
PO BOX 79, INDEPENDENCE, IA 50644-0079
PO BOX 80, INDEPENDENCE, IA 50644-0080
PO BOX 81, INDEPENDENCE, IA 50644-0081
PO BOX 82, INDEPENDENCE, IA 50644-0082
PO BOX 83, INDEPENDENCE, IA 50644-0083
PO BOX 84, INDEPENDENCE, IA 50644-0084
PO BOX 85, INDEPENDENCE, IA 50644-0085
PO BOX 86, INDEPENDENCE, IA 50644-0086
PO BOX 87, INDEPENDENCE, IA 50644-0087
PO BOX 88, INDEPENDENCE, IA 50644-0088
PO BOX 89, INDEPENDENCE, IA 50644-0089
PO BOX 90, INDEPENDENCE, IA 50644-0090
PO BOX 91, INDEPENDENCE, IA 50644-0091
PO BOX 92, INDEPENDENCE, IA 50644-0092
PO BOX 93, INDEPENDENCE, IA 50644-0093
PO BOX 94, INDEPENDENCE, IA 50644-0094
PO BOX 95, INDEPENDENCE, IA 50644-0095
PO BOX 96, INDEPENDENCE, IA 50644-0096
PO BOX 97, INDEPENDENCE, IA 50644-0097
PO BOX 98, INDEPENDENCE, IA 50644-0098
PO BOX 99, INDEPENDENCE, IA 50644-0099
PO BOX 100, INDEPENDENCE, IA 50644-0100
PO BOX 101, INDEPENDENCE, IA 50644-0101
PO BOX 102, INDEPENDENCE, IA 50644-0102
PO BOX 103, INDEPENDENCE, IA 50644-0103
PO BOX 104, INDEPENDENCE, IA 50644-0104
PO BOX 105, INDEPENDENCE, IA 50644-0105
PO BOX 106, INDEPENDENCE, IA 50644-0106
PO BOX 107, INDEPENDENCE, IA 50644-0107
PO BOX 108, INDEPENDENCE, IA 50644-0108
PO BOX 109, INDEPENDENCE, IA 50644-0109
PO BOX 110, INDEPENDENCE, IA 50644-0110
PO BOX 111, INDEPENDENCE, IA 50644-0111
PO BOX 112, INDEPENDENCE, IA 50644-0112
PO BOX 113, INDEPENDENCE, IA 50644-0113
PO BOX 114, INDEPENDENCE, IA 50644-0114
PO BOX 115, INDEPENDENCE, IA 50644-0115
PO BOX 116, INDEPENDENCE, IA 50644-0116
PO BOX 117, INDEPENDENCE, IA 50644-0117
PO BOX 118, INDEPENDENCE, IA 50644-0118
PO BOX 119, INDEPENDENCE, IA 50644-0119
PO BOX 120, INDEPENDENCE, IA 50644-0120
PO BOX 121, INDEPENDENCE, IA 50644-0121
PO BOX 122, INDEPENDENCE, IA 50644-0122
PO BOX 123, INDEPENDENCE, IA 50644-0123
PO BOX 124, INDEPENDENCE, IA 50644-0124
PO BOX 125, INDEPENDENCE, IA 50644-0125
PO BOX 126, INDEPENDENCE, IA 50644-0126
PO BOX 127, INDEPENDENCE, IA 50644-0127
PO BOX 128, INDEPENDENCE, IA 50644-0128
PO BOX 129, INDEPENDENCE, IA 50644-0129
PO BOX 130, INDEPENDENCE, IA 50644-0130
PO BOX 131, INDEPENDENCE, IA 50644-0131
PO BOX 132, INDEPENDENCE, IA 50644-0132
PO BOX 133, INDEPENDENCE, IA 50644-0133
PO BOX 134, INDEPENDENCE, IA 50644-0134
PO BOX 135, INDEPENDENCE, IA 50644-0135
PO BOX 136, INDEPENDENCE, IA 50644-0136
PO BOX 137, INDEPENDENCE, IA 50644-0137
PO BOX 138, INDEPENDENCE, IA 50644-0138
PO BOX 139, INDEPENDENCE, IA 50644-0139
PO BOX 140, INDEPENDENCE, IA 50644-0140
PO BOX 141, INDEPENDENCE, IA 50644-0141
PO BOX 142, INDEPENDENCE, IA 50644-0142
PO BOX 143, INDEPENDENCE, IA 50644-0143
PO BOX 144, INDEPENDENCE, IA 50644-0144
PO BOX 145, INDEPENDENCE, IA 50644-0145
PO BOX 146, INDEPENDENCE, IA 50644-0146
PO BOX 147, INDEPENDENCE, IA 50644-0147
PO BOX 148, INDEPENDENCE, IA 50644-0148
PO BOX 149, INDEPENDENCE, IA 50644-0149
PO BOX 150, INDEPENDENCE, IA 50644-0150
PO BOX 151, INDEPENDENCE, IA 50644-0151
PO BOX 152, INDEPENDENCE, IA 50644-0152
PO BOX 153, INDEPENDENCE, IA 50644-0153
PO BOX 154, INDEPENDENCE, IA 50644-0154
PO BOX 155, INDEPENDENCE, IA 50644-0155
PO BOX 156, INDEPENDENCE, IA 50644-0156
PO BOX 157, INDEPENDENCE, IA 50644-0157
PO BOX 158, INDEPENDENCE, IA 50644-0158
PO BOX 159, INDEPENDENCE, IA 50644-0159
PO BOX 160, INDEPENDENCE, IA 50644-0160
PO BOX 161, INDEPENDENCE, IA 50644-0161
PO BOX 162, INDEPENDENCE, IA 50644-0162
PO BOX 163, INDEPENDENCE, IA 50644-0163
PO BOX 164, INDEPENDENCE, IA 50644-0164
PO BOX 165, INDEPENDENCE, IA 50644-0165
PO BOX 166, INDEPENDENCE, IA 50644-0166
PO BOX 167, INDEPENDENCE, IA 50644-0167
PO BOX 168, INDEPENDENCE, IA 50644-0168
PO BOX 169, INDEPENDENCE, IA 50644-0169
PO BOX 170, INDEPENDENCE, IA 50644-0170
PO BOX 171, INDEPENDENCE, IA 50644-0171
PO BOX 172, INDEPENDENCE, IA 50644-0172
PO BOX 173, INDEPENDENCE, IA 50644-0173
PO BOX 174, INDEPENDENCE, IA 50644-0174
PO BOX 175, INDEPENDENCE, IA 50644-0175
PO BOX 176, INDEPENDENCE, IA 50644-0176
PO BOX 177, INDEPENDENCE, IA 50644-0177
PO BOX 178, INDEPENDENCE, IA 50644-0178
PO BOX 179, INDEPENDENCE, IA 50644-0179
PO BOX 180, INDEPENDENCE, IA 50644-0180
PO BOX 181, INDEPENDENCE, IA 50644-0181
PO BOX 182, INDEPENDENCE, IA 50644-0182
PO BOX 183, INDEPENDENCE, IA 50644-0183
PO BOX 184, INDEPENDENCE, IA 50644-0184
PO BOX 185, INDEPENDENCE, IA 50644-0185
PO BOX 186, INDEPENDENCE, IA 50644-0186
PO BOX 187, INDEPENDENCE, IA 50644-0187
PO BOX 188, INDEPENDENCE, IA 50644-0188
PO BOX 189, INDEPENDENCE, IA 50644-0189
PO BOX 190, INDEPENDENCE, IA 50644-0190
PO BOX 191, INDEPENDENCE, IA 50644-0191
PO BOX 192, INDEPENDENCE, IA 50644-0192
PO BOX 193, INDEPENDENCE, IA 50644-0193
PO BOX 194, INDEPENDENCE, IA 50644-0194
PO BOX 195, INDEPENDENCE, IA 50644-0195
PO BOX 196, INDEPENDENCE, IA 50644-0196
PO BOX 197, INDEPENDENCE, IA 50644-0197
PO BOX 198, INDEPENDENCE, IA 50644-0198
PO BOX 199, INDEPENDENCE, IA 50644-0199
PO BOX 200, INDEPENDENCE, IA 50644-0200
PO BOX 201, INDEPENDENCE, IA 50644-0201
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