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, ALTON, MO 65606-0001
PO BOX 2, ALTON, MO 65606-0002
PO BOX 3, ALTON, MO 65606-0003
PO BOX 4, ALTON, MO 65606-0004
PO BOX 5, ALTON, MO 65606-0005
PO BOX 6, ALTON, MO 65606-0006
PO BOX 7, ALTON, MO 65606-0007
PO BOX 8, ALTON, MO 65606-0008
PO BOX 9, ALTON, MO 65606-0009
PO BOX 10, ALTON, MO 65606-0010
PO BOX 11, ALTON, MO 65606-0011
PO BOX 12, ALTON, MO 65606-0012
PO BOX 13, ALTON, MO 65606-0013
PO BOX 14, ALTON, MO 65606-0014
PO BOX 15, ALTON, MO 65606-0015
PO BOX 16, ALTON, MO 65606-0016
PO BOX 17, ALTON, MO 65606-0017
PO BOX 18, ALTON, MO 65606-0018
PO BOX 19, ALTON, MO 65606-0019
PO BOX 20, ALTON, MO 65606-0020
PO BOX 21, ALTON, MO 65606-0021
PO BOX 22, ALTON, MO 65606-0022
PO BOX 23, ALTON, MO 65606-0023
PO BOX 24, ALTON, MO 65606-0024
PO BOX 25, ALTON, MO 65606-0025
PO BOX 26, ALTON, MO 65606-0026
PO BOX 27, ALTON, MO 65606-0027
PO BOX 28, ALTON, MO 65606-0028
PO BOX 29, ALTON, MO 65606-0029
PO BOX 30, ALTON, MO 65606-0030
PO BOX 31, ALTON, MO 65606-0031
PO BOX 32, ALTON, MO 65606-0032
PO BOX 33, ALTON, MO 65606-0033
PO BOX 34, ALTON, MO 65606-0034
PO BOX 35, ALTON, MO 65606-0035
PO BOX 36, ALTON, MO 65606-0036
PO BOX 37, ALTON, MO 65606-0037
PO BOX 38, ALTON, MO 65606-0038
PO BOX 39, ALTON, MO 65606-0039
PO BOX 40, ALTON, MO 65606-0040
PO BOX 41, ALTON, MO 65606-0041
PO BOX 42, ALTON, MO 65606-0042
PO BOX 43, ALTON, MO 65606-0043
PO BOX 44, ALTON, MO 65606-0044
PO BOX 45, ALTON, MO 65606-0045
PO BOX 46, ALTON, MO 65606-0046
PO BOX 47, ALTON, MO 65606-0047
PO BOX 48, ALTON, MO 65606-0048
PO BOX 49, ALTON, MO 65606-0049
PO BOX 50, ALTON, MO 65606-0050
PO BOX 51, ALTON, MO 65606-0051
PO BOX 52, ALTON, MO 65606-0052
PO BOX 53, ALTON, MO 65606-0053
PO BOX 54, ALTON, MO 65606-0054
PO BOX 55, ALTON, MO 65606-0055
PO BOX 56, ALTON, MO 65606-0056
PO BOX 57, ALTON, MO 65606-0057
PO BOX 58, ALTON, MO 65606-0058
PO BOX 59, ALTON, MO 65606-0059
PO BOX 60, ALTON, MO 65606-0060
PO BOX 61, ALTON, MO 65606-0061
PO BOX 62, ALTON, MO 65606-0062
PO BOX 63, ALTON, MO 65606-0063
PO BOX 64, ALTON, MO 65606-0064
PO BOX 65, ALTON, MO 65606-0065
PO BOX 66, ALTON, MO 65606-0066
PO BOX 67, ALTON, MO 65606-0067
PO BOX 68, ALTON, MO 65606-0068
PO BOX 69, ALTON, MO 65606-0069
PO BOX 70, ALTON, MO 65606-0070
PO BOX 71, ALTON, MO 65606-0071
PO BOX 72, ALTON, MO 65606-0072
PO BOX 73, ALTON, MO 65606-0073
PO BOX 74, ALTON, MO 65606-0074
PO BOX 75, ALTON, MO 65606-0075
PO BOX 76, ALTON, MO 65606-0076
PO BOX 77, ALTON, MO 65606-0077
PO BOX 78, ALTON, MO 65606-0078
PO BOX 79, ALTON, MO 65606-0079
PO BOX 80, ALTON, MO 65606-0080
PO BOX 81, ALTON, MO 65606-0081
PO BOX 82, ALTON, MO 65606-0082
PO BOX 83, ALTON, MO 65606-0083
PO BOX 84, ALTON, MO 65606-0084
PO BOX 85, ALTON, MO 65606-0085
PO BOX 86, ALTON, MO 65606-0086
PO BOX 87, ALTON, MO 65606-0087
PO BOX 88, ALTON, MO 65606-0088
PO BOX 89, ALTON, MO 65606-0089
PO BOX 90, ALTON, MO 65606-0090
PO BOX 91, ALTON, MO 65606-0091
PO BOX 92, ALTON, MO 65606-0092
PO BOX 93, ALTON, MO 65606-0093
PO BOX 94, ALTON, MO 65606-0094
PO BOX 95, ALTON, MO 65606-0095
PO BOX 96, ALTON, MO 65606-0096
PO BOX 97, ALTON, MO 65606-0097
PO BOX 98, ALTON, MO 65606-0098
PO BOX 99, ALTON, MO 65606-0099
PO BOX 100, ALTON, MO 65606-0100
PO BOX 101, ALTON, MO 65606-0101
PO BOX 102, ALTON, MO 65606-0102
PO BOX 103, ALTON, MO 65606-0103
PO BOX 104, ALTON, MO 65606-0104
PO BOX 105, ALTON, MO 65606-0105
PO BOX 106, ALTON, MO 65606-0106
PO BOX 107, ALTON, MO 65606-0107
PO BOX 108, ALTON, MO 65606-0108
PO BOX 109, ALTON, MO 65606-0109
PO BOX 110, ALTON, MO 65606-0110
PO BOX 111, ALTON, MO 65606-0111
PO BOX 112, ALTON, MO 65606-0112
PO BOX 113, ALTON, MO 65606-0113
PO BOX 114, ALTON, MO 65606-0114
PO BOX 115, ALTON, MO 65606-0115
PO BOX 116, ALTON, MO 65606-0116
PO BOX 117, ALTON, MO 65606-0117
PO BOX 118, ALTON, MO 65606-0118
PO BOX 119, ALTON, MO 65606-0119
PO BOX 120, ALTON, MO 65606-0120
PO BOX 121, ALTON, MO 65606-0121
PO BOX 122, ALTON, MO 65606-0122
PO BOX 123, ALTON, MO 65606-0123
PO BOX 124, ALTON, MO 65606-0124
PO BOX 125, ALTON, MO 65606-0125
PO BOX 126, ALTON, MO 65606-0126
PO BOX 127, ALTON, MO 65606-0127
PO BOX 128, ALTON, MO 65606-0128
PO BOX 129, ALTON, MO 65606-0129
PO BOX 130, ALTON, MO 65606-0130
PO BOX 131, ALTON, MO 65606-0131
PO BOX 132, ALTON, MO 65606-0132
PO BOX 133, ALTON, MO 65606-0133
PO BOX 134, ALTON, MO 65606-0134
PO BOX 135, ALTON, MO 65606-0135
PO BOX 136, ALTON, MO 65606-0136
PO BOX 137, ALTON, MO 65606-0137
PO BOX 138, ALTON, MO 65606-0138
PO BOX 139, ALTON, MO 65606-0139
PO BOX 140, ALTON, MO 65606-0140
PO BOX 141, ALTON, MO 65606-0141
PO BOX 142, ALTON, MO 65606-0142
PO BOX 143, ALTON, MO 65606-0143
PO BOX 144, ALTON, MO 65606-0144
PO BOX 145, ALTON, MO 65606-0145
PO BOX 146, ALTON, MO 65606-0146
PO BOX 147, ALTON, MO 65606-0147
PO BOX 148, ALTON, MO 65606-0148
PO BOX 149, ALTON, MO 65606-0149
PO BOX 150, ALTON, MO 65606-0150
PO BOX 151, ALTON, MO 65606-0151
PO BOX 152, ALTON, MO 65606-0152
PO BOX 153, ALTON, MO 65606-0153
PO BOX 154, ALTON, MO 65606-0154
PO BOX 155, ALTON, MO 65606-0155
PO BOX 156, ALTON, MO 65606-0156
PO BOX 157, ALTON, MO 65606-0157
PO BOX 158, ALTON, MO 65606-0158
PO BOX 159, ALTON, MO 65606-0159
PO BOX 160, ALTON, MO 65606-0160
PO BOX 161, ALTON, MO 65606-0161
PO BOX 162, ALTON, MO 65606-0162
PO BOX 163, ALTON, MO 65606-0163
PO BOX 164, ALTON, MO 65606-0164
PO BOX 165, ALTON, MO 65606-0165
PO BOX 166, ALTON, MO 65606-0166
PO BOX 167, ALTON, MO 65606-0167
PO BOX 168, ALTON, MO 65606-0168
PO BOX 169, ALTON, MO 65606-0169
PO BOX 170, ALTON, MO 65606-0170
PO BOX 171, ALTON, MO 65606-0171
PO BOX 172, ALTON, MO 65606-0172
PO BOX 173, ALTON, MO 65606-0173
PO BOX 174, ALTON, MO 65606-0174
PO BOX 175, ALTON, MO 65606-0175
PO BOX 176, ALTON, MO 65606-0176
PO BOX 177, ALTON, MO 65606-0177
PO BOX 178, ALTON, MO 65606-0178
PO BOX 179, ALTON, MO 65606-0179
PO BOX 180, ALTON, MO 65606-0180
PO BOX 181, ALTON, MO 65606-0181
PO BOX 182, ALTON, MO 65606-0182
PO BOX 183, ALTON, MO 65606-0183
PO BOX 184, ALTON, MO 65606-0184
PO BOX 185, ALTON, MO 65606-0185
PO BOX 186, ALTON, MO 65606-0186
PO BOX 187, ALTON, MO 65606-0187
PO BOX 188, ALTON, MO 65606-0188
PO BOX 189, ALTON, MO 65606-0189
PO BOX 190, ALTON, MO 65606-0190
PO BOX 191, ALTON, MO 65606-0191
PO BOX 192, ALTON, MO 65606-0192
PO BOX 193, ALTON, MO 65606-0193
PO BOX 194, ALTON, MO 65606-0194
PO BOX 195, ALTON, MO 65606-0195
PO BOX 196, ALTON, MO 65606-0196
PO BOX 197, ALTON, MO 65606-0197
PO BOX 198, ALTON, MO 65606-0198
PO BOX 199, ALTON, MO 65606-0199
PO BOX 200, ALTON, MO 65606-0200
PO BOX 201, ALTON, MO 65606-0201
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