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, TRURO, IA 50257-0011
PO BOX 12, TRURO, IA 50257-0012
PO BOX 13, TRURO, IA 50257-0013
PO BOX 14, TRURO, IA 50257-0014
PO BOX 15, TRURO, IA 50257-0015
PO BOX 16, TRURO, IA 50257-0016
PO BOX 17, TRURO, IA 50257-0017
PO BOX 18, TRURO, IA 50257-0018
PO BOX 19, TRURO, IA 50257-0019
PO BOX 20, TRURO, IA 50257-0020
PO BOX 21, TRURO, IA 50257-0021
PO BOX 22, TRURO, IA 50257-0022
PO BOX 23, TRURO, IA 50257-0023
PO BOX 24, TRURO, IA 50257-0024
PO BOX 25, TRURO, IA 50257-0025
PO BOX 26, TRURO, IA 50257-0026
PO BOX 27, TRURO, IA 50257-0027
PO BOX 28, TRURO, IA 50257-0028
PO BOX 29, TRURO, IA 50257-0029
PO BOX 30, TRURO, IA 50257-0030
PO BOX 31, TRURO, IA 50257-0031
PO BOX 32, TRURO, IA 50257-0032
PO BOX 33, TRURO, IA 50257-0033
PO BOX 34, TRURO, IA 50257-0034
PO BOX 35, TRURO, IA 50257-0035
PO BOX 36, TRURO, IA 50257-0036
PO BOX 37, TRURO, IA 50257-0037
PO BOX 38, TRURO, IA 50257-0038
PO BOX 39, TRURO, IA 50257-0039
PO BOX 40, TRURO, IA 50257-0040
PO BOX 41, TRURO, IA 50257-0041
PO BOX 42, TRURO, IA 50257-0042
PO BOX 43, TRURO, IA 50257-0043
PO BOX 44, TRURO, IA 50257-0044
PO BOX 45, TRURO, IA 50257-0045
PO BOX 46, TRURO, IA 50257-0046
PO BOX 47, TRURO, IA 50257-0047
PO BOX 48, TRURO, IA 50257-0048
PO BOX 49, TRURO, IA 50257-0049
PO BOX 50, TRURO, IA 50257-0050
PO BOX 51, TRURO, IA 50257-0051
PO BOX 52, TRURO, IA 50257-0052
PO BOX 53, TRURO, IA 50257-0053
PO BOX 54, TRURO, IA 50257-0054
PO BOX 55, TRURO, IA 50257-0055
PO BOX 56, TRURO, IA 50257-0056
PO BOX 57, TRURO, IA 50257-0057
PO BOX 58, TRURO, IA 50257-0058
PO BOX 59, TRURO, IA 50257-0059
PO BOX 60, TRURO, IA 50257-0060
PO BOX 61, TRURO, IA 50257-0061
PO BOX 62, TRURO, IA 50257-0062
PO BOX 63, TRURO, IA 50257-0063
PO BOX 64, TRURO, IA 50257-0064
PO BOX 65, TRURO, IA 50257-0065
PO BOX 66, TRURO, IA 50257-0066
PO BOX 67, TRURO, IA 50257-0067
PO BOX 68, TRURO, IA 50257-0068
PO BOX 69, TRURO, IA 50257-0069
PO BOX 70, TRURO, IA 50257-0070
PO BOX 71, TRURO, IA 50257-0071
PO BOX 72, TRURO, IA 50257-0072
PO BOX 73, TRURO, IA 50257-0073
PO BOX 74, TRURO, IA 50257-0074
PO BOX 75, TRURO, IA 50257-0075
PO BOX 76, TRURO, IA 50257-0076
PO BOX 77, TRURO, IA 50257-0077
PO BOX 78, TRURO, IA 50257-0078
PO BOX 79, TRURO, IA 50257-0079
PO BOX 80, TRURO, IA 50257-0080
PO BOX 81, TRURO, IA 50257-0081
PO BOX 82, TRURO, IA 50257-0082
PO BOX 83, TRURO, IA 50257-0083
PO BOX 84, TRURO, IA 50257-0084
PO BOX 85, TRURO, IA 50257-0085
PO BOX 86, TRURO, IA 50257-0086
PO BOX 87, TRURO, IA 50257-0087
PO BOX 88, TRURO, IA 50257-0088
PO BOX 89, TRURO, IA 50257-0089
PO BOX 90, TRURO, IA 50257-0090
PO BOX 91, TRURO, IA 50257-0091
PO BOX 92, TRURO, IA 50257-0092
PO BOX 93, TRURO, IA 50257-0093
PO BOX 94, TRURO, IA 50257-0094
PO BOX 95, TRURO, IA 50257-0095
PO BOX 96, TRURO, IA 50257-0096
PO BOX 97, TRURO, IA 50257-0097
PO BOX 98, TRURO, IA 50257-0098
PO BOX 99, TRURO, IA 50257-0099
PO BOX 100, TRURO, IA 50257-0100
PO BOX 101, TRURO, IA 50257-0101
PO BOX 102, TRURO, IA 50257-0102
PO BOX 103, TRURO, IA 50257-0103
PO BOX 104, TRURO, IA 50257-0104
PO BOX 105, TRURO, IA 50257-0105
PO BOX 106, TRURO, IA 50257-0106
PO BOX 107, TRURO, IA 50257-0107
PO BOX 108, TRURO, IA 50257-0108
PO BOX 109, TRURO, IA 50257-0109
PO BOX 110, TRURO, IA 50257-0110
PO BOX 111, TRURO, IA 50257-0111
PO BOX 112, TRURO, IA 50257-0112
PO BOX 113, TRURO, IA 50257-0113
PO BOX 114, TRURO, IA 50257-0114
PO BOX 115, TRURO, IA 50257-0115
PO BOX 116, TRURO, IA 50257-0116
PO BOX 117, TRURO, IA 50257-0117
PO BOX 118, TRURO, IA 50257-0118
PO BOX 119, TRURO, IA 50257-0119
PO BOX 120, TRURO, IA 50257-0120
PO BOX 121, TRURO, IA 50257-0121
PO BOX 122, TRURO, IA 50257-0122
PO BOX 123, TRURO, IA 50257-0123
PO BOX 124, TRURO, IA 50257-0124
PO BOX 125, TRURO, IA 50257-0125
PO BOX 126, TRURO, IA 50257-0126
PO BOX 127, TRURO, IA 50257-0127
PO BOX 128, TRURO, IA 50257-0128
PO BOX 129, TRURO, IA 50257-0129
PO BOX 130, TRURO, IA 50257-0130
PO BOX 131, TRURO, IA 50257-0131
PO BOX 132, TRURO, IA 50257-0132
PO BOX 133, TRURO, IA 50257-0133
PO BOX 134, TRURO, IA 50257-0134
PO BOX 135, TRURO, IA 50257-0135
PO BOX 136, TRURO, IA 50257-0136
PO BOX 137, TRURO, IA 50257-0137
PO BOX 138, TRURO, IA 50257-0138
PO BOX 139, TRURO, IA 50257-0139
PO BOX 140, TRURO, IA 50257-0140
PO BOX 141, TRURO, IA 50257-0141
PO BOX 142, TRURO, IA 50257-0142
PO BOX 143, TRURO, IA 50257-0143
PO BOX 144, TRURO, IA 50257-0144
PO BOX 145, TRURO, IA 50257-0145
PO BOX 146, TRURO, IA 50257-0146
PO BOX 147, TRURO, IA 50257-0147
PO BOX 148, TRURO, IA 50257-0148
PO BOX 149, TRURO, IA 50257-0149
PO BOX 150, TRURO, IA 50257-0150
PO BOX 151, TRURO, IA 50257-0151
PO BOX 152, TRURO, IA 50257-0152
PO BOX 153, TRURO, IA 50257-0153
PO BOX 154, TRURO, IA 50257-0154
PO BOX 155, TRURO, IA 50257-0155
PO BOX 156, TRURO, IA 50257-0156
PO BOX 157, TRURO, IA 50257-0157
PO BOX 158, TRURO, IA 50257-0158
PO BOX 159, TRURO, IA 50257-0159
PO BOX 160, TRURO, IA 50257-0160
PO BOX 161, TRURO, IA 50257-0161
PO BOX 162, TRURO, IA 50257-0162
PO BOX 163, TRURO, IA 50257-0163
PO BOX 164, TRURO, IA 50257-0164
PO BOX 165, TRURO, IA 50257-0165
PO BOX 166, TRURO, IA 50257-0166
PO BOX 167, TRURO, IA 50257-0167
PO BOX 168, TRURO, IA 50257-0168
PO BOX 169, TRURO, IA 50257-0169
PO BOX 170, TRURO, IA 50257-0170
PO BOX 171, TRURO, IA 50257-0171
PO BOX 172, TRURO, IA 50257-0172
PO BOX 173, TRURO, IA 50257-0173
PO BOX 174, TRURO, IA 50257-0174
PO BOX 175, TRURO, IA 50257-0175
PO BOX 176, TRURO, IA 50257-0176
PO BOX 177, TRURO, IA 50257-0177
PO BOX 178, TRURO, IA 50257-0178
PO BOX 179, TRURO, IA 50257-0179
PO BOX 180, TRURO, IA 50257-0180
PO BOX 181, TRURO, IA 50257-0181
PO BOX 182, TRURO, IA 50257-0182
PO BOX 183, TRURO, IA 50257-0183
PO BOX 184, TRURO, IA 50257-0184
PO BOX 185, TRURO, IA 50257-0185
PO BOX 186, TRURO, IA 50257-0186
PO BOX 187, TRURO, IA 50257-0187
PO BOX 188, TRURO, IA 50257-0188
PO BOX 189, TRURO, IA 50257-0189
PO BOX 190, TRURO, IA 50257-0190
PO BOX 191, TRURO, IA 50257-0191
PO BOX 192, TRURO, IA 50257-0192
PO BOX 193, TRURO, IA 50257-0193
PO BOX 194, TRURO, IA 50257-0194
PO BOX 195, TRURO, IA 50257-0195
PO BOX 196, TRURO, IA 50257-0196
PO BOX 197, TRURO, IA 50257-0197
PO BOX 198, TRURO, IA 50257-0198
PO BOX 199, TRURO, IA 50257-0199
PO BOX 200, TRURO, IA 50257-0200
PO BOX 201, TRURO, IA 50257-0201
PO BOX 202, TRURO, IA 50257-0202
PO BOX 203, TRURO, IA 50257-0203
PO BOX 204, TRURO, IA 50257-0204
PO BOX 205, TRURO, IA 50257-0205
PO BOX 206, TRURO, IA 50257-0206
PO BOX 207, TRURO, IA 50257-0207
PO BOX 208, TRURO, IA 50257-0208
PO BOX 209, TRURO, IA 50257-0209
PO BOX 210, TRURO, IA 50257-0210
PO BOX 211, TRURO, IA 50257-0211
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