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 11, PLYMOUTH, IA 50464-0011
PO BOX 12, PLYMOUTH, IA 50464-0012
PO BOX 13, PLYMOUTH, IA 50464-0013
PO BOX 14, PLYMOUTH, IA 50464-0014
PO BOX 15, PLYMOUTH, IA 50464-0015
PO BOX 16, PLYMOUTH, IA 50464-0016
PO BOX 17, PLYMOUTH, IA 50464-0017
PO BOX 18, PLYMOUTH, IA 50464-0018
PO BOX 19, PLYMOUTH, IA 50464-0019
PO BOX 20, PLYMOUTH, IA 50464-0020
PO BOX 21, PLYMOUTH, IA 50464-0021
PO BOX 22, PLYMOUTH, IA 50464-0022
PO BOX 23, PLYMOUTH, IA 50464-0023
PO BOX 24, PLYMOUTH, IA 50464-0024
PO BOX 25, PLYMOUTH, IA 50464-0025
PO BOX 26, PLYMOUTH, IA 50464-0026
PO BOX 27, PLYMOUTH, IA 50464-0027
PO BOX 28, PLYMOUTH, IA 50464-0028
PO BOX 29, PLYMOUTH, IA 50464-0029
PO BOX 30, PLYMOUTH, IA 50464-0030
PO BOX 31, PLYMOUTH, IA 50464-0031
PO BOX 32, PLYMOUTH, IA 50464-0032
PO BOX 33, PLYMOUTH, IA 50464-0033
PO BOX 34, PLYMOUTH, IA 50464-0034
PO BOX 35, PLYMOUTH, IA 50464-0035
PO BOX 36, PLYMOUTH, IA 50464-0036
PO BOX 37, PLYMOUTH, IA 50464-0037
PO BOX 38, PLYMOUTH, IA 50464-0038
PO BOX 39, PLYMOUTH, IA 50464-0039
PO BOX 40, PLYMOUTH, IA 50464-0040
PO BOX 41, PLYMOUTH, IA 50464-0041
PO BOX 42, PLYMOUTH, IA 50464-0042
PO BOX 43, PLYMOUTH, IA 50464-0043
PO BOX 44, PLYMOUTH, IA 50464-0044
PO BOX 45, PLYMOUTH, IA 50464-0045
PO BOX 46, PLYMOUTH, IA 50464-0046
PO BOX 47, PLYMOUTH, IA 50464-0047
PO BOX 48, PLYMOUTH, IA 50464-0048
PO BOX 49, PLYMOUTH, IA 50464-0049
PO BOX 50, PLYMOUTH, IA 50464-0050
PO BOX 51, PLYMOUTH, IA 50464-0051
PO BOX 52, PLYMOUTH, IA 50464-0052
PO BOX 53, PLYMOUTH, IA 50464-0053
PO BOX 54, PLYMOUTH, IA 50464-0054
PO BOX 55, PLYMOUTH, IA 50464-0055
PO BOX 56, PLYMOUTH, IA 50464-0056
PO BOX 57, PLYMOUTH, IA 50464-0057
PO BOX 58, PLYMOUTH, IA 50464-0058
PO BOX 59, PLYMOUTH, IA 50464-0059
PO BOX 60, PLYMOUTH, IA 50464-0060
PO BOX 61, PLYMOUTH, IA 50464-0061
PO BOX 62, PLYMOUTH, IA 50464-0062
PO BOX 63, PLYMOUTH, IA 50464-0063
PO BOX 64, PLYMOUTH, IA 50464-0064
PO BOX 65, PLYMOUTH, IA 50464-0065
PO BOX 66, PLYMOUTH, IA 50464-0066
PO BOX 67, PLYMOUTH, IA 50464-0067
PO BOX 68, PLYMOUTH, IA 50464-0068
PO BOX 69, PLYMOUTH, IA 50464-0069
PO BOX 70, PLYMOUTH, IA 50464-0070
PO BOX 71, PLYMOUTH, IA 50464-0071
PO BOX 72, PLYMOUTH, IA 50464-0072
PO BOX 73, PLYMOUTH, IA 50464-0073
PO BOX 74, PLYMOUTH, IA 50464-0074
PO BOX 75, PLYMOUTH, IA 50464-0075
PO BOX 76, PLYMOUTH, IA 50464-0076
PO BOX 77, PLYMOUTH, IA 50464-0077
PO BOX 78, PLYMOUTH, IA 50464-0078
PO BOX 79, PLYMOUTH, IA 50464-0079
PO BOX 80, PLYMOUTH, IA 50464-0080
PO BOX 81, PLYMOUTH, IA 50464-0081
PO BOX 82, PLYMOUTH, IA 50464-0082
PO BOX 83, PLYMOUTH, IA 50464-0083
PO BOX 84, PLYMOUTH, IA 50464-0084
PO BOX 85, PLYMOUTH, IA 50464-0085
PO BOX 86, PLYMOUTH, IA 50464-0086
PO BOX 87, PLYMOUTH, IA 50464-0087
PO BOX 88, PLYMOUTH, IA 50464-0088
PO BOX 89, PLYMOUTH, IA 50464-0089
PO BOX 90, PLYMOUTH, IA 50464-0090
PO BOX 91, PLYMOUTH, IA 50464-0091
PO BOX 92, PLYMOUTH, IA 50464-0092
PO BOX 93, PLYMOUTH, IA 50464-0093
PO BOX 94, PLYMOUTH, IA 50464-0094
PO BOX 95, PLYMOUTH, IA 50464-0095
PO BOX 96, PLYMOUTH, IA 50464-0096
PO BOX 97, PLYMOUTH, IA 50464-0097
PO BOX 98, PLYMOUTH, IA 50464-0098
PO BOX 99, PLYMOUTH, IA 50464-0099
PO BOX 100, PLYMOUTH, IA 50464-0100
PO BOX 101, PLYMOUTH, IA 50464-0101
PO BOX 102, PLYMOUTH, IA 50464-0102
PO BOX 103, PLYMOUTH, IA 50464-0103
PO BOX 104, PLYMOUTH, IA 50464-0104
PO BOX 105, PLYMOUTH, IA 50464-0105
PO BOX 106, PLYMOUTH, IA 50464-0106
PO BOX 107, PLYMOUTH, IA 50464-0107
PO BOX 108, PLYMOUTH, IA 50464-0108
PO BOX 109, PLYMOUTH, IA 50464-0109
PO BOX 110, PLYMOUTH, IA 50464-0110
PO BOX 111, PLYMOUTH, IA 50464-0111
PO BOX 112, PLYMOUTH, IA 50464-0112
PO BOX 113, PLYMOUTH, IA 50464-0113
PO BOX 114, PLYMOUTH, IA 50464-0114
PO BOX 115, PLYMOUTH, IA 50464-0115
PO BOX 116, PLYMOUTH, IA 50464-0116
PO BOX 117, PLYMOUTH, IA 50464-0117
PO BOX 118, PLYMOUTH, IA 50464-0118
PO BOX 119, PLYMOUTH, IA 50464-0119
PO BOX 120, PLYMOUTH, IA 50464-0120
PO BOX 121, PLYMOUTH, IA 50464-0121
PO BOX 122, PLYMOUTH, IA 50464-0122
PO BOX 123, PLYMOUTH, IA 50464-0123
PO BOX 124, PLYMOUTH, IA 50464-0124
PO BOX 125, PLYMOUTH, IA 50464-0125
PO BOX 126, PLYMOUTH, IA 50464-0126
PO BOX 127, PLYMOUTH, IA 50464-0127
PO BOX 128, PLYMOUTH, IA 50464-0128
PO BOX 129, PLYMOUTH, IA 50464-0129
PO BOX 130, PLYMOUTH, IA 50464-0130
PO BOX 131, PLYMOUTH, IA 50464-0131
PO BOX 132, PLYMOUTH, IA 50464-0132
PO BOX 133, PLYMOUTH, IA 50464-0133
PO BOX 134, PLYMOUTH, IA 50464-0134
PO BOX 135, PLYMOUTH, IA 50464-0135
PO BOX 136, PLYMOUTH, IA 50464-0136
PO BOX 137, PLYMOUTH, IA 50464-0137
PO BOX 138, PLYMOUTH, IA 50464-0138
PO BOX 139, PLYMOUTH, IA 50464-0139
PO BOX 140, PLYMOUTH, IA 50464-0140
PO BOX 141, PLYMOUTH, IA 50464-0141
PO BOX 142, PLYMOUTH, IA 50464-0142
PO BOX 143, PLYMOUTH, IA 50464-0143
PO BOX 144, PLYMOUTH, IA 50464-0144
PO BOX 145, PLYMOUTH, IA 50464-0145
PO BOX 146, PLYMOUTH, IA 50464-0146
PO BOX 147, PLYMOUTH, IA 50464-0147
PO BOX 148, PLYMOUTH, IA 50464-0148
PO BOX 149, PLYMOUTH, IA 50464-0149
PO BOX 150, PLYMOUTH, IA 50464-0150
PO BOX 151, PLYMOUTH, IA 50464-0151
PO BOX 152, PLYMOUTH, IA 50464-0152
PO BOX 153, PLYMOUTH, IA 50464-0153
PO BOX 154, PLYMOUTH, IA 50464-0154
PO BOX 155, PLYMOUTH, IA 50464-0155
PO BOX 156, PLYMOUTH, IA 50464-0156
PO BOX 157, PLYMOUTH, IA 50464-0157
PO BOX 158, PLYMOUTH, IA 50464-0158
PO BOX 159, PLYMOUTH, IA 50464-0159
PO BOX 160, PLYMOUTH, IA 50464-0160
PO BOX 161, PLYMOUTH, IA 50464-0161
PO BOX 162, PLYMOUTH, IA 50464-0162
PO BOX 163, PLYMOUTH, IA 50464-0163
PO BOX 164, PLYMOUTH, IA 50464-0164
PO BOX 165, PLYMOUTH, IA 50464-0165
PO BOX 166, PLYMOUTH, IA 50464-0166
PO BOX 167, PLYMOUTH, IA 50464-0167
PO BOX 168, PLYMOUTH, IA 50464-0168
PO BOX 169, PLYMOUTH, IA 50464-0169
PO BOX 170, PLYMOUTH, IA 50464-0170
PO BOX 171, PLYMOUTH, IA 50464-0171
PO BOX 172, PLYMOUTH, IA 50464-0172
PO BOX 173, PLYMOUTH, IA 50464-0173
PO BOX 174, PLYMOUTH, IA 50464-0174
PO BOX 175, PLYMOUTH, IA 50464-0175
PO BOX 176, PLYMOUTH, IA 50464-0176
PO BOX 177, PLYMOUTH, IA 50464-0177
PO BOX 178, PLYMOUTH, IA 50464-0178
PO BOX 179, PLYMOUTH, IA 50464-0179
PO BOX 180, PLYMOUTH, IA 50464-0180
PO BOX 181, PLYMOUTH, IA 50464-0181
PO BOX 182, PLYMOUTH, IA 50464-0182
PO BOX 183, PLYMOUTH, IA 50464-0183
PO BOX 184, PLYMOUTH, IA 50464-0184
PO BOX 185, PLYMOUTH, IA 50464-0185
PO BOX 186, PLYMOUTH, IA 50464-0186
PO BOX 187, PLYMOUTH, IA 50464-0187
PO BOX 188, PLYMOUTH, IA 50464-0188
PO BOX 189, PLYMOUTH, IA 50464-0189
PO BOX 190, PLYMOUTH, IA 50464-0190
PO BOX 191, PLYMOUTH, IA 50464-0191
PO BOX 192, PLYMOUTH, IA 50464-0192
PO BOX 193, PLYMOUTH, IA 50464-0193
PO BOX 194, PLYMOUTH, IA 50464-0194
PO BOX 195, PLYMOUTH, IA 50464-0195
PO BOX 196, PLYMOUTH, IA 50464-0196
PO BOX 197, PLYMOUTH, IA 50464-0197
PO BOX 198, PLYMOUTH, IA 50464-0198
PO BOX 199, PLYMOUTH, IA 50464-0199
PO BOX 200, PLYMOUTH, IA 50464-0200
PO BOX 201, PLYMOUTH, IA 50464-0201
PO BOX 202, PLYMOUTH, IA 50464-0202
PO BOX 203, PLYMOUTH, IA 50464-0203
PO BOX 204, PLYMOUTH, IA 50464-0204
PO BOX 205, PLYMOUTH, IA 50464-0205
PO BOX 206, PLYMOUTH, IA 50464-0206
PO BOX 207, PLYMOUTH, IA 50464-0207
PO BOX 208, PLYMOUTH, IA 50464-0208
PO BOX 209, PLYMOUTH, IA 50464-0209
PO BOX 210, PLYMOUTH, IA 50464-0210
PO BOX 211, PLYMOUTH, IA 50464-0211
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