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 12, SMITHLAND, IA 51056-0012
PO BOX 13, SMITHLAND, IA 51056-0013
PO BOX 14, SMITHLAND, IA 51056-0014
PO BOX 15, SMITHLAND, IA 51056-0015
PO BOX 16, SMITHLAND, IA 51056-0016
PO BOX 17, SMITHLAND, IA 51056-0017
PO BOX 18, SMITHLAND, IA 51056-0018
PO BOX 19, SMITHLAND, IA 51056-0019
PO BOX 20, SMITHLAND, IA 51056-0020
PO BOX 21, SMITHLAND, IA 51056-0021
PO BOX 22, SMITHLAND, IA 51056-0022
PO BOX 23, SMITHLAND, IA 51056-0023
PO BOX 24, SMITHLAND, IA 51056-0024
PO BOX 25, SMITHLAND, IA 51056-0025
PO BOX 26, SMITHLAND, IA 51056-0026
PO BOX 27, SMITHLAND, IA 51056-0027
PO BOX 28, SMITHLAND, IA 51056-0028
PO BOX 29, SMITHLAND, IA 51056-0029
PO BOX 30, SMITHLAND, IA 51056-0030
PO BOX 31, SMITHLAND, IA 51056-0031
PO BOX 32, SMITHLAND, IA 51056-0032
PO BOX 33, SMITHLAND, IA 51056-0033
PO BOX 34, SMITHLAND, IA 51056-0034
PO BOX 35, SMITHLAND, IA 51056-0035
PO BOX 36, SMITHLAND, IA 51056-0036
PO BOX 37, SMITHLAND, IA 51056-0037
PO BOX 38, SMITHLAND, IA 51056-0038
PO BOX 39, SMITHLAND, IA 51056-0039
PO BOX 40, SMITHLAND, IA 51056-0040
PO BOX 41, SMITHLAND, IA 51056-0041
PO BOX 42, SMITHLAND, IA 51056-0042
PO BOX 43, SMITHLAND, IA 51056-0043
PO BOX 44, SMITHLAND, IA 51056-0044
PO BOX 45, SMITHLAND, IA 51056-0045
PO BOX 46, SMITHLAND, IA 51056-0046
PO BOX 47, SMITHLAND, IA 51056-0047
PO BOX 48, SMITHLAND, IA 51056-0048
PO BOX 49, SMITHLAND, IA 51056-0049
PO BOX 50, SMITHLAND, IA 51056-0050
PO BOX 51, SMITHLAND, IA 51056-0051
PO BOX 52, SMITHLAND, IA 51056-0052
PO BOX 53, SMITHLAND, IA 51056-0053
PO BOX 54, SMITHLAND, IA 51056-0054
PO BOX 55, SMITHLAND, IA 51056-0055
PO BOX 56, SMITHLAND, IA 51056-0056
PO BOX 57, SMITHLAND, IA 51056-0057
PO BOX 58, SMITHLAND, IA 51056-0058
PO BOX 59, SMITHLAND, IA 51056-0059
PO BOX 60, SMITHLAND, IA 51056-0060
PO BOX 61, SMITHLAND, IA 51056-0061
PO BOX 62, SMITHLAND, IA 51056-0062
PO BOX 63, SMITHLAND, IA 51056-0063
PO BOX 64, SMITHLAND, IA 51056-0064
PO BOX 65, SMITHLAND, IA 51056-0065
PO BOX 66, SMITHLAND, IA 51056-0066
PO BOX 67, SMITHLAND, IA 51056-0067
PO BOX 68, SMITHLAND, IA 51056-0068
PO BOX 69, SMITHLAND, IA 51056-0069
PO BOX 70, SMITHLAND, IA 51056-0070
PO BOX 71, SMITHLAND, IA 51056-0071
PO BOX 72, SMITHLAND, IA 51056-0072
PO BOX 73, SMITHLAND, IA 51056-0073
PO BOX 74, SMITHLAND, IA 51056-0074
PO BOX 75, SMITHLAND, IA 51056-0075
PO BOX 76, SMITHLAND, IA 51056-0076
PO BOX 77, SMITHLAND, IA 51056-0077
PO BOX 78, SMITHLAND, IA 51056-0078
PO BOX 79, SMITHLAND, IA 51056-0079
PO BOX 80, SMITHLAND, IA 51056-0080
PO BOX 81, SMITHLAND, IA 51056-0081
PO BOX 82, SMITHLAND, IA 51056-0082
PO BOX 83, SMITHLAND, IA 51056-0083
PO BOX 84, SMITHLAND, IA 51056-0084
PO BOX 85, SMITHLAND, IA 51056-0085
PO BOX 86, SMITHLAND, IA 51056-0086
PO BOX 87, SMITHLAND, IA 51056-0087
PO BOX 88, SMITHLAND, IA 51056-0088
PO BOX 89, SMITHLAND, IA 51056-0089
PO BOX 90, SMITHLAND, IA 51056-0090
PO BOX 91, SMITHLAND, IA 51056-0091
PO BOX 92, SMITHLAND, IA 51056-0092
PO BOX 93, SMITHLAND, IA 51056-0093
PO BOX 94, SMITHLAND, IA 51056-0094
PO BOX 95, SMITHLAND, IA 51056-0095
PO BOX 96, SMITHLAND, IA 51056-0096
PO BOX 97, SMITHLAND, IA 51056-0097
PO BOX 98, SMITHLAND, IA 51056-0098
PO BOX 99, SMITHLAND, IA 51056-0099
PO BOX 100, SMITHLAND, IA 51056-0100
PO BOX 101, SMITHLAND, IA 51056-0101
PO BOX 102, SMITHLAND, IA 51056-0102
PO BOX 103, SMITHLAND, IA 51056-0103
PO BOX 104, SMITHLAND, IA 51056-0104
PO BOX 105, SMITHLAND, IA 51056-0105
PO BOX 106, SMITHLAND, IA 51056-0106
PO BOX 107, SMITHLAND, IA 51056-0107
PO BOX 108, SMITHLAND, IA 51056-0108
PO BOX 109, SMITHLAND, IA 51056-0109
PO BOX 110, SMITHLAND, IA 51056-0110
PO BOX 111, SMITHLAND, IA 51056-0111
PO BOX 112, SMITHLAND, IA 51056-0112
PO BOX 113, SMITHLAND, IA 51056-0113
PO BOX 114, SMITHLAND, IA 51056-0114
PO BOX 115, SMITHLAND, IA 51056-0115
PO BOX 116, SMITHLAND, IA 51056-0116
PO BOX 117, SMITHLAND, IA 51056-0117
PO BOX 118, SMITHLAND, IA 51056-0118
PO BOX 119, SMITHLAND, IA 51056-0119
PO BOX 120, SMITHLAND, IA 51056-0120
PO BOX 121, SMITHLAND, IA 51056-0121
PO BOX 122, SMITHLAND, IA 51056-0122
PO BOX 123, SMITHLAND, IA 51056-0123
PO BOX 124, SMITHLAND, IA 51056-0124
PO BOX 125, SMITHLAND, IA 51056-0125
PO BOX 126, SMITHLAND, IA 51056-0126
PO BOX 127, SMITHLAND, IA 51056-0127
PO BOX 128, SMITHLAND, IA 51056-0128
PO BOX 129, SMITHLAND, IA 51056-0129
PO BOX 130, SMITHLAND, IA 51056-0130
PO BOX 131, SMITHLAND, IA 51056-0131
PO BOX 132, SMITHLAND, IA 51056-0132
PO BOX 133, SMITHLAND, IA 51056-0133
PO BOX 134, SMITHLAND, IA 51056-0134
PO BOX 135, SMITHLAND, IA 51056-0135
PO BOX 136, SMITHLAND, IA 51056-0136
PO BOX 137, SMITHLAND, IA 51056-0137
PO BOX 138, SMITHLAND, IA 51056-0138
PO BOX 139, SMITHLAND, IA 51056-0139
PO BOX 140, SMITHLAND, IA 51056-0140
PO BOX 141, SMITHLAND, IA 51056-0141
PO BOX 142, SMITHLAND, IA 51056-0142
PO BOX 143, SMITHLAND, IA 51056-0143
PO BOX 144, SMITHLAND, IA 51056-0144
PO BOX 145, SMITHLAND, IA 51056-0145
PO BOX 146, SMITHLAND, IA 51056-0146
PO BOX 147, SMITHLAND, IA 51056-0147
PO BOX 148, SMITHLAND, IA 51056-0148
PO BOX 149, SMITHLAND, IA 51056-0149
PO BOX 150, SMITHLAND, IA 51056-0150
PO BOX 151, SMITHLAND, IA 51056-0151
PO BOX 152, SMITHLAND, IA 51056-0152
PO BOX 153, SMITHLAND, IA 51056-0153
PO BOX 154, SMITHLAND, IA 51056-0154
PO BOX 155, SMITHLAND, IA 51056-0155
PO BOX 156, SMITHLAND, IA 51056-0156
PO BOX 157, SMITHLAND, IA 51056-0157
PO BOX 158, SMITHLAND, IA 51056-0158
PO BOX 159, SMITHLAND, IA 51056-0159
PO BOX 160, SMITHLAND, IA 51056-0160
PO BOX 161, SMITHLAND, IA 51056-0161
PO BOX 162, SMITHLAND, IA 51056-0162
PO BOX 163, SMITHLAND, IA 51056-0163
PO BOX 164, SMITHLAND, IA 51056-0164
PO BOX 165, SMITHLAND, IA 51056-0165
PO BOX 166, SMITHLAND, IA 51056-0166
PO BOX 167, SMITHLAND, IA 51056-0167
PO BOX 168, SMITHLAND, IA 51056-0168
PO BOX 169, SMITHLAND, IA 51056-0169
PO BOX 170, SMITHLAND, IA 51056-0170
PO BOX 171, SMITHLAND, IA 51056-0171
PO BOX 172, SMITHLAND, IA 51056-0172
PO BOX 173, SMITHLAND, IA 51056-0173
PO BOX 174, SMITHLAND, IA 51056-0174
PO BOX 175, SMITHLAND, IA 51056-0175
PO BOX 176, SMITHLAND, IA 51056-0176
PO BOX 177, SMITHLAND, IA 51056-0177
PO BOX 178, SMITHLAND, IA 51056-0178
PO BOX 179, SMITHLAND, IA 51056-0179
PO BOX 180, SMITHLAND, IA 51056-0180
PO BOX 181, SMITHLAND, IA 51056-0181
PO BOX 182, SMITHLAND, IA 51056-0182
PO BOX 183, SMITHLAND, IA 51056-0183
PO BOX 184, SMITHLAND, IA 51056-0184
PO BOX 185, SMITHLAND, IA 51056-0185
PO BOX 186, SMITHLAND, IA 51056-0186
PO BOX 187, SMITHLAND, IA 51056-0187
PO BOX 188, SMITHLAND, IA 51056-0188
PO BOX 189, SMITHLAND, IA 51056-0189
PO BOX 190, SMITHLAND, IA 51056-0190
PO BOX 191, SMITHLAND, IA 51056-0191
PO BOX 192, SMITHLAND, IA 51056-0192
PO BOX 193, SMITHLAND, IA 51056-0193
PO BOX 194, SMITHLAND, IA 51056-0194
PO BOX 195, SMITHLAND, IA 51056-0195
PO BOX 196, SMITHLAND, IA 51056-0196
PO BOX 197, SMITHLAND, IA 51056-0197
PO BOX 198, SMITHLAND, IA 51056-0198
PO BOX 199, SMITHLAND, IA 51056-0199
PO BOX 200, SMITHLAND, IA 51056-0200
PO BOX 201, SMITHLAND, IA 51056-0201
PO BOX 202, SMITHLAND, IA 51056-0202
PO BOX 203, SMITHLAND, IA 51056-0203
PO BOX 204, SMITHLAND, IA 51056-0204
PO BOX 205, SMITHLAND, IA 51056-0205
PO BOX 206, SMITHLAND, IA 51056-0206
PO BOX 207, SMITHLAND, IA 51056-0207
PO BOX 208, SMITHLAND, IA 51056-0208
PO BOX 209, SMITHLAND, IA 51056-0209
PO BOX 210, SMITHLAND, IA 51056-0210
PO BOX 211, SMITHLAND, IA 51056-0211
PO BOX 212, SMITHLAND, IA 51056-0212
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