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 21, SOUTH WEST CITY, MO 64863-0021
PO BOX 22, SOUTH WEST CITY, MO 64863-0022
PO BOX 23, SOUTH WEST CITY, MO 64863-0023
PO BOX 24, SOUTH WEST CITY, MO 64863-0024
PO BOX 25, SOUTH WEST CITY, MO 64863-0025
PO BOX 26, SOUTH WEST CITY, MO 64863-0026
PO BOX 27, SOUTH WEST CITY, MO 64863-0027
PO BOX 28, SOUTH WEST CITY, MO 64863-0028
PO BOX 29, SOUTH WEST CITY, MO 64863-0029
PO BOX 30, SOUTH WEST CITY, MO 64863-0030
PO BOX 31, SOUTH WEST CITY, MO 64863-0031
PO BOX 32, SOUTH WEST CITY, MO 64863-0032
PO BOX 33, SOUTH WEST CITY, MO 64863-0033
PO BOX 34, SOUTH WEST CITY, MO 64863-0034
PO BOX 35, SOUTH WEST CITY, MO 64863-0035
PO BOX 36, SOUTH WEST CITY, MO 64863-0036
PO BOX 37, SOUTH WEST CITY, MO 64863-0037
PO BOX 38, SOUTH WEST CITY, MO 64863-0038
PO BOX 39, SOUTH WEST CITY, MO 64863-0039
PO BOX 40, SOUTH WEST CITY, MO 64863-0040
PO BOX 41, SOUTH WEST CITY, MO 64863-0041
PO BOX 42, SOUTH WEST CITY, MO 64863-0042
PO BOX 43, SOUTH WEST CITY, MO 64863-0043
PO BOX 44, SOUTH WEST CITY, MO 64863-0044
PO BOX 45, SOUTH WEST CITY, MO 64863-0045
PO BOX 46, SOUTH WEST CITY, MO 64863-0046
PO BOX 47, SOUTH WEST CITY, MO 64863-0047
PO BOX 48, SOUTH WEST CITY, MO 64863-0048
PO BOX 49, SOUTH WEST CITY, MO 64863-0049
PO BOX 50, SOUTH WEST CITY, MO 64863-0050
PO BOX 51, SOUTH WEST CITY, MO 64863-0051
PO BOX 52, SOUTH WEST CITY, MO 64863-0052
PO BOX 53, SOUTH WEST CITY, MO 64863-0053
PO BOX 54, SOUTH WEST CITY, MO 64863-0054
PO BOX 55, SOUTH WEST CITY, MO 64863-0055
PO BOX 56, SOUTH WEST CITY, MO 64863-0056
PO BOX 57, SOUTH WEST CITY, MO 64863-0057
PO BOX 58, SOUTH WEST CITY, MO 64863-0058
PO BOX 59, SOUTH WEST CITY, MO 64863-0059
PO BOX 60, SOUTH WEST CITY, MO 64863-0060
PO BOX 61, SOUTH WEST CITY, MO 64863-0061
PO BOX 62, SOUTH WEST CITY, MO 64863-0062
PO BOX 63, SOUTH WEST CITY, MO 64863-0063
PO BOX 64, SOUTH WEST CITY, MO 64863-0064
PO BOX 65, SOUTH WEST CITY, MO 64863-0065
PO BOX 66, SOUTH WEST CITY, MO 64863-0066
PO BOX 67, SOUTH WEST CITY, MO 64863-0067
PO BOX 68, SOUTH WEST CITY, MO 64863-0068
PO BOX 69, SOUTH WEST CITY, MO 64863-0069
PO BOX 70, SOUTH WEST CITY, MO 64863-0070
PO BOX 71, SOUTH WEST CITY, MO 64863-0071
PO BOX 72, SOUTH WEST CITY, MO 64863-0072
PO BOX 73, SOUTH WEST CITY, MO 64863-0073
PO BOX 74, SOUTH WEST CITY, MO 64863-0074
PO BOX 75, SOUTH WEST CITY, MO 64863-0075
PO BOX 76, SOUTH WEST CITY, MO 64863-0076
PO BOX 77, SOUTH WEST CITY, MO 64863-0077
PO BOX 78, SOUTH WEST CITY, MO 64863-0078
PO BOX 79, SOUTH WEST CITY, MO 64863-0079
PO BOX 80, SOUTH WEST CITY, MO 64863-0080
PO BOX 81, SOUTH WEST CITY, MO 64863-0081
PO BOX 82, SOUTH WEST CITY, MO 64863-0082
PO BOX 83, SOUTH WEST CITY, MO 64863-0083
PO BOX 84, SOUTH WEST CITY, MO 64863-0084
PO BOX 85, SOUTH WEST CITY, MO 64863-0085
PO BOX 86, SOUTH WEST CITY, MO 64863-0086
PO BOX 87, SOUTH WEST CITY, MO 64863-0087
PO BOX 88, SOUTH WEST CITY, MO 64863-0088
PO BOX 89, SOUTH WEST CITY, MO 64863-0089
PO BOX 90, SOUTH WEST CITY, MO 64863-0090
PO BOX 91, SOUTH WEST CITY, MO 64863-0091
PO BOX 92, SOUTH WEST CITY, MO 64863-0092
PO BOX 93, SOUTH WEST CITY, MO 64863-0093
PO BOX 94, SOUTH WEST CITY, MO 64863-0094
PO BOX 95, SOUTH WEST CITY, MO 64863-0095
PO BOX 96, SOUTH WEST CITY, MO 64863-0096
PO BOX 97, SOUTH WEST CITY, MO 64863-0097
PO BOX 98, SOUTH WEST CITY, MO 64863-0098
PO BOX 99, SOUTH WEST CITY, MO 64863-0099
PO BOX 100, SOUTH WEST CITY, MO 64863-0100
PO BOX 101, SOUTH WEST CITY, MO 64863-0101
PO BOX 102, SOUTH WEST CITY, MO 64863-0102
PO BOX 103, SOUTH WEST CITY, MO 64863-0103
PO BOX 104, SOUTH WEST CITY, MO 64863-0104
PO BOX 105, SOUTH WEST CITY, MO 64863-0105
PO BOX 106, SOUTH WEST CITY, MO 64863-0106
PO BOX 107, SOUTH WEST CITY, MO 64863-0107
PO BOX 108, SOUTH WEST CITY, MO 64863-0108
PO BOX 109, SOUTH WEST CITY, MO 64863-0109
PO BOX 110, SOUTH WEST CITY, MO 64863-0110
PO BOX 111, SOUTH WEST CITY, MO 64863-0111
PO BOX 112, SOUTH WEST CITY, MO 64863-0112
PO BOX 113, SOUTH WEST CITY, MO 64863-0113
PO BOX 114, SOUTH WEST CITY, MO 64863-0114
PO BOX 115, SOUTH WEST CITY, MO 64863-0115
PO BOX 116, SOUTH WEST CITY, MO 64863-0116
PO BOX 117, SOUTH WEST CITY, MO 64863-0117
PO BOX 118, SOUTH WEST CITY, MO 64863-0118
PO BOX 119, SOUTH WEST CITY, MO 64863-0119
PO BOX 120, SOUTH WEST CITY, MO 64863-0120
PO BOX 121, SOUTH WEST CITY, MO 64863-0121
PO BOX 122, SOUTH WEST CITY, MO 64863-0122
PO BOX 123, SOUTH WEST CITY, MO 64863-0123
PO BOX 124, SOUTH WEST CITY, MO 64863-0124
PO BOX 125, SOUTH WEST CITY, MO 64863-0125
PO BOX 126, SOUTH WEST CITY, MO 64863-0126
PO BOX 127, SOUTH WEST CITY, MO 64863-0127
PO BOX 128, SOUTH WEST CITY, MO 64863-0128
PO BOX 129, SOUTH WEST CITY, MO 64863-0129
PO BOX 130, SOUTH WEST CITY, MO 64863-0130
PO BOX 131, SOUTH WEST CITY, MO 64863-0131
PO BOX 132, SOUTH WEST CITY, MO 64863-0132
PO BOX 133, SOUTH WEST CITY, MO 64863-0133
PO BOX 134, SOUTH WEST CITY, MO 64863-0134
PO BOX 135, SOUTH WEST CITY, MO 64863-0135
PO BOX 136, SOUTH WEST CITY, MO 64863-0136
PO BOX 137, SOUTH WEST CITY, MO 64863-0137
PO BOX 138, SOUTH WEST CITY, MO 64863-0138
PO BOX 139, SOUTH WEST CITY, MO 64863-0139
PO BOX 140, SOUTH WEST CITY, MO 64863-0140
PO BOX 141, SOUTH WEST CITY, MO 64863-0141
PO BOX 142, SOUTH WEST CITY, MO 64863-0142
PO BOX 143, SOUTH WEST CITY, MO 64863-0143
PO BOX 144, SOUTH WEST CITY, MO 64863-0144
PO BOX 145, SOUTH WEST CITY, MO 64863-0145
PO BOX 146, SOUTH WEST CITY, MO 64863-0146
PO BOX 147, SOUTH WEST CITY, MO 64863-0147
PO BOX 148, SOUTH WEST CITY, MO 64863-0148
PO BOX 149, SOUTH WEST CITY, MO 64863-0149
PO BOX 150, SOUTH WEST CITY, MO 64863-0150
PO BOX 151, SOUTH WEST CITY, MO 64863-0151
PO BOX 152, SOUTH WEST CITY, MO 64863-0152
PO BOX 153, SOUTH WEST CITY, MO 64863-0153
PO BOX 154, SOUTH WEST CITY, MO 64863-0154
PO BOX 155, SOUTH WEST CITY, MO 64863-0155
PO BOX 156, SOUTH WEST CITY, MO 64863-0156
PO BOX 157, SOUTH WEST CITY, MO 64863-0157
PO BOX 158, SOUTH WEST CITY, MO 64863-0158
PO BOX 159, SOUTH WEST CITY, MO 64863-0159
PO BOX 160, SOUTH WEST CITY, MO 64863-0160
PO BOX 161, SOUTH WEST CITY, MO 64863-0161
PO BOX 162, SOUTH WEST CITY, MO 64863-0162
PO BOX 163, SOUTH WEST CITY, MO 64863-0163
PO BOX 164, SOUTH WEST CITY, MO 64863-0164
PO BOX 165, SOUTH WEST CITY, MO 64863-0165
PO BOX 166, SOUTH WEST CITY, MO 64863-0166
PO BOX 167, SOUTH WEST CITY, MO 64863-0167
PO BOX 168, SOUTH WEST CITY, MO 64863-0168
PO BOX 169, SOUTH WEST CITY, MO 64863-0169
PO BOX 170, SOUTH WEST CITY, MO 64863-0170
PO BOX 171, SOUTH WEST CITY, MO 64863-0171
PO BOX 172, SOUTH WEST CITY, MO 64863-0172
PO BOX 173, SOUTH WEST CITY, MO 64863-0173
PO BOX 174, SOUTH WEST CITY, MO 64863-0174
PO BOX 175, SOUTH WEST CITY, MO 64863-0175
PO BOX 176, SOUTH WEST CITY, MO 64863-0176
PO BOX 177, SOUTH WEST CITY, MO 64863-0177
PO BOX 178, SOUTH WEST CITY, MO 64863-0178
PO BOX 179, SOUTH WEST CITY, MO 64863-0179
PO BOX 180, SOUTH WEST CITY, MO 64863-0180
PO BOX 181, SOUTH WEST CITY, MO 64863-0181
PO BOX 182, SOUTH WEST CITY, MO 64863-0182
PO BOX 183, SOUTH WEST CITY, MO 64863-0183
PO BOX 184, SOUTH WEST CITY, MO 64863-0184
PO BOX 185, SOUTH WEST CITY, MO 64863-0185
PO BOX 186, SOUTH WEST CITY, MO 64863-0186
PO BOX 187, SOUTH WEST CITY, MO 64863-0187
PO BOX 188, SOUTH WEST CITY, MO 64863-0188
PO BOX 189, SOUTH WEST CITY, MO 64863-0189
PO BOX 190, SOUTH WEST CITY, MO 64863-0190
PO BOX 191, SOUTH WEST CITY, MO 64863-0191
PO BOX 192, SOUTH WEST CITY, MO 64863-0192
PO BOX 193, SOUTH WEST CITY, MO 64863-0193
PO BOX 194, SOUTH WEST CITY, MO 64863-0194
PO BOX 195, SOUTH WEST CITY, MO 64863-0195
PO BOX 196, SOUTH WEST CITY, MO 64863-0196
PO BOX 197, SOUTH WEST CITY, MO 64863-0197
PO BOX 198, SOUTH WEST CITY, MO 64863-0198
PO BOX 199, SOUTH WEST CITY, MO 64863-0199
PO BOX 200, SOUTH WEST CITY, MO 64863-0200
PO BOX 201, SOUTH WEST CITY, MO 64863-0201
PO BOX 202, SOUTH WEST CITY, MO 64863-0202
PO BOX 203, SOUTH WEST CITY, MO 64863-0203
PO BOX 204, SOUTH WEST CITY, MO 64863-0204
PO BOX 205, SOUTH WEST CITY, MO 64863-0205
PO BOX 206, SOUTH WEST CITY, MO 64863-0206
PO BOX 207, SOUTH WEST CITY, MO 64863-0207
PO BOX 208, SOUTH WEST CITY, MO 64863-0208
PO BOX 209, SOUTH WEST CITY, MO 64863-0209
PO BOX 210, SOUTH WEST CITY, MO 64863-0210
PO BOX 211, SOUTH WEST CITY, MO 64863-0211
PO BOX 212, SOUTH WEST CITY, MO 64863-0212
PO BOX 213, SOUTH WEST CITY, MO 64863-0213
PO BOX 214, SOUTH WEST CITY, MO 64863-0214
PO BOX 215, SOUTH WEST CITY, MO 64863-0215
PO BOX 216, SOUTH WEST CITY, MO 64863-0216
PO BOX 217, SOUTH WEST CITY, MO 64863-0217
PO BOX 218, SOUTH WEST CITY, MO 64863-0218
PO BOX 219, SOUTH WEST CITY, MO 64863-0219
PO BOX 220, SOUTH WEST CITY, MO 64863-0220
PO BOX 221, SOUTH WEST CITY, MO 64863-0221
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