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, LANSING, IA 52151-0001
PO BOX 2, LANSING, IA 52151-0002
PO BOX 3, LANSING, IA 52151-0003
PO BOX 4, LANSING, IA 52151-0004
PO BOX 5, LANSING, IA 52151-0005
PO BOX 6, LANSING, IA 52151-0006
PO BOX 7, LANSING, IA 52151-0007
PO BOX 8, LANSING, IA 52151-0008
PO BOX 9, LANSING, IA 52151-0009
PO BOX 10, LANSING, IA 52151-0010
PO BOX 11, LANSING, IA 52151-0011
PO BOX 12, LANSING, IA 52151-0012
PO BOX 13, LANSING, IA 52151-0013
PO BOX 14, LANSING, IA 52151-0014
PO BOX 15, LANSING, IA 52151-0015
PO BOX 16, LANSING, IA 52151-0016
PO BOX 17, LANSING, IA 52151-0017
PO BOX 18, LANSING, IA 52151-0018
PO BOX 19, LANSING, IA 52151-0019
PO BOX 20, LANSING, IA 52151-0020
PO BOX 21, LANSING, IA 52151-0021
PO BOX 22, LANSING, IA 52151-0022
PO BOX 23, LANSING, IA 52151-0023
PO BOX 24, LANSING, IA 52151-0024
PO BOX 25, LANSING, IA 52151-0025
PO BOX 26, LANSING, IA 52151-0026
PO BOX 27, LANSING, IA 52151-0027
PO BOX 28, LANSING, IA 52151-0028
PO BOX 29, LANSING, IA 52151-0029
PO BOX 30, LANSING, IA 52151-0030
PO BOX 31, LANSING, IA 52151-0031
PO BOX 32, LANSING, IA 52151-0032
PO BOX 33, LANSING, IA 52151-0033
PO BOX 34, LANSING, IA 52151-0034
PO BOX 35, LANSING, IA 52151-0035
PO BOX 36, LANSING, IA 52151-0036
PO BOX 37, LANSING, IA 52151-0037
PO BOX 38, LANSING, IA 52151-0038
PO BOX 39, LANSING, IA 52151-0039
PO BOX 40, LANSING, IA 52151-0040
PO BOX 41, LANSING, IA 52151-0041
PO BOX 42, LANSING, IA 52151-0042
PO BOX 43, LANSING, IA 52151-0043
PO BOX 44, LANSING, IA 52151-0044
PO BOX 45, LANSING, IA 52151-0045
PO BOX 46, LANSING, IA 52151-0046
PO BOX 47, LANSING, IA 52151-0047
PO BOX 48, LANSING, IA 52151-0048
PO BOX 49, LANSING, IA 52151-0049
PO BOX 50, LANSING, IA 52151-0050
PO BOX 51, LANSING, IA 52151-0051
PO BOX 52, LANSING, IA 52151-0052
PO BOX 53, LANSING, IA 52151-0053
PO BOX 54, LANSING, IA 52151-0054
PO BOX 55, LANSING, IA 52151-0055
PO BOX 56, LANSING, IA 52151-0056
PO BOX 57, LANSING, IA 52151-0057
PO BOX 58, LANSING, IA 52151-0058
PO BOX 59, LANSING, IA 52151-0059
PO BOX 60, LANSING, IA 52151-0060
PO BOX 61, LANSING, IA 52151-0061
PO BOX 62, LANSING, IA 52151-0062
PO BOX 63, LANSING, IA 52151-0063
PO BOX 64, LANSING, IA 52151-0064
PO BOX 65, LANSING, IA 52151-0065
PO BOX 66, LANSING, IA 52151-0066
PO BOX 67, LANSING, IA 52151-0067
PO BOX 68, LANSING, IA 52151-0068
PO BOX 69, LANSING, IA 52151-0069
PO BOX 70, LANSING, IA 52151-0070
PO BOX 71, LANSING, IA 52151-0071
PO BOX 72, LANSING, IA 52151-0072
PO BOX 73, LANSING, IA 52151-0073
PO BOX 74, LANSING, IA 52151-0074
PO BOX 75, LANSING, IA 52151-0075
PO BOX 76, LANSING, IA 52151-0076
PO BOX 77, LANSING, IA 52151-0077
PO BOX 78, LANSING, IA 52151-0078
PO BOX 79, LANSING, IA 52151-0079
PO BOX 80, LANSING, IA 52151-0080
PO BOX 81, LANSING, IA 52151-0081
PO BOX 82, LANSING, IA 52151-0082
PO BOX 83, LANSING, IA 52151-0083
PO BOX 84, LANSING, IA 52151-0084
PO BOX 85, LANSING, IA 52151-0085
PO BOX 86, LANSING, IA 52151-0086
PO BOX 87, LANSING, IA 52151-0087
PO BOX 88, LANSING, IA 52151-0088
PO BOX 89, LANSING, IA 52151-0089
PO BOX 90, LANSING, IA 52151-0090
PO BOX 91, LANSING, IA 52151-0091
PO BOX 92, LANSING, IA 52151-0092
PO BOX 93, LANSING, IA 52151-0093
PO BOX 94, LANSING, IA 52151-0094
PO BOX 95, LANSING, IA 52151-0095
PO BOX 96, LANSING, IA 52151-0096
PO BOX 97, LANSING, IA 52151-0097
PO BOX 98, LANSING, IA 52151-0098
PO BOX 99, LANSING, IA 52151-0099
PO BOX 100, LANSING, IA 52151-0100
PO BOX 101, LANSING, IA 52151-0101
PO BOX 102, LANSING, IA 52151-0102
PO BOX 103, LANSING, IA 52151-0103
PO BOX 104, LANSING, IA 52151-0104
PO BOX 105, LANSING, IA 52151-0105
PO BOX 106, LANSING, IA 52151-0106
PO BOX 107, LANSING, IA 52151-0107
PO BOX 108, LANSING, IA 52151-0108
PO BOX 109, LANSING, IA 52151-0109
PO BOX 110, LANSING, IA 52151-0110
PO BOX 111, LANSING, IA 52151-0111
PO BOX 112, LANSING, IA 52151-0112
PO BOX 113, LANSING, IA 52151-0113
PO BOX 114, LANSING, IA 52151-0114
PO BOX 115, LANSING, IA 52151-0115
PO BOX 116, LANSING, IA 52151-0116
PO BOX 117, LANSING, IA 52151-0117
PO BOX 118, LANSING, IA 52151-0118
PO BOX 119, LANSING, IA 52151-0119
PO BOX 120, LANSING, IA 52151-0120
PO BOX 121, LANSING, IA 52151-0121
PO BOX 122, LANSING, IA 52151-0122
PO BOX 123, LANSING, IA 52151-0123
PO BOX 124, LANSING, IA 52151-0124
PO BOX 125, LANSING, IA 52151-0125
PO BOX 126, LANSING, IA 52151-0126
PO BOX 127, LANSING, IA 52151-0127
PO BOX 128, LANSING, IA 52151-0128
PO BOX 129, LANSING, IA 52151-0129
PO BOX 130, LANSING, IA 52151-0130
PO BOX 131, LANSING, IA 52151-0131
PO BOX 132, LANSING, IA 52151-0132
PO BOX 133, LANSING, IA 52151-0133
PO BOX 134, LANSING, IA 52151-0134
PO BOX 135, LANSING, IA 52151-0135
PO BOX 136, LANSING, IA 52151-0136
PO BOX 137, LANSING, IA 52151-0137
PO BOX 138, LANSING, IA 52151-0138
PO BOX 139, LANSING, IA 52151-0139
PO BOX 140, LANSING, IA 52151-0140
PO BOX 141, LANSING, IA 52151-0141
PO BOX 142, LANSING, IA 52151-0142
PO BOX 143, LANSING, IA 52151-0143
PO BOX 144, LANSING, IA 52151-0144
PO BOX 145, LANSING, IA 52151-0145
PO BOX 146, LANSING, IA 52151-0146
PO BOX 147, LANSING, IA 52151-0147
PO BOX 148, LANSING, IA 52151-0148
PO BOX 149, LANSING, IA 52151-0149
PO BOX 150, LANSING, IA 52151-0150
PO BOX 151, LANSING, IA 52151-0151
PO BOX 152, LANSING, IA 52151-0152
PO BOX 153, LANSING, IA 52151-0153
PO BOX 154, LANSING, IA 52151-0154
PO BOX 155, LANSING, IA 52151-0155
PO BOX 156, LANSING, IA 52151-0156
PO BOX 157, LANSING, IA 52151-0157
PO BOX 158, LANSING, IA 52151-0158
PO BOX 159, LANSING, IA 52151-0159
PO BOX 160, LANSING, IA 52151-0160
PO BOX 161, LANSING, IA 52151-0161
PO BOX 162, LANSING, IA 52151-0162
PO BOX 163, LANSING, IA 52151-0163
PO BOX 164, LANSING, IA 52151-0164
PO BOX 165, LANSING, IA 52151-0165
PO BOX 166, LANSING, IA 52151-0166
PO BOX 167, LANSING, IA 52151-0167
PO BOX 168, LANSING, IA 52151-0168
PO BOX 169, LANSING, IA 52151-0169
PO BOX 170, LANSING, IA 52151-0170
PO BOX 171, LANSING, IA 52151-0171
PO BOX 172, LANSING, IA 52151-0172
PO BOX 173, LANSING, IA 52151-0173
PO BOX 174, LANSING, IA 52151-0174
PO BOX 175, LANSING, IA 52151-0175
PO BOX 176, LANSING, IA 52151-0176
PO BOX 177, LANSING, IA 52151-0177
PO BOX 178, LANSING, IA 52151-0178
PO BOX 179, LANSING, IA 52151-0179
PO BOX 180, LANSING, IA 52151-0180
PO BOX 181, LANSING, IA 52151-0181
PO BOX 182, LANSING, IA 52151-0182
PO BOX 183, LANSING, IA 52151-0183
PO BOX 184, LANSING, IA 52151-0184
PO BOX 185, LANSING, IA 52151-0185
PO BOX 186, LANSING, IA 52151-0186
PO BOX 187, LANSING, IA 52151-0187
PO BOX 188, LANSING, IA 52151-0188
PO BOX 189, LANSING, IA 52151-0189
PO BOX 190, LANSING, IA 52151-0190
PO BOX 191, LANSING, IA 52151-0191
PO BOX 192, LANSING, IA 52151-0192
PO BOX 193, LANSING, IA 52151-0193
PO BOX 194, LANSING, IA 52151-0194
PO BOX 195, LANSING, IA 52151-0195
PO BOX 196, LANSING, IA 52151-0196
PO BOX 197, LANSING, IA 52151-0197
PO BOX 198, LANSING, IA 52151-0198
PO BOX 199, LANSING, IA 52151-0199
PO BOX 200, LANSING, IA 52151-0200
PO BOX 201, LANSING, IA 52151-0201
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