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, SAINT LOUIS, OK 74866-0001
PO BOX 2, SAINT LOUIS, OK 74866-0002
PO BOX 3, SAINT LOUIS, OK 74866-0003
PO BOX 4, SAINT LOUIS, OK 74866-0004
PO BOX 5, SAINT LOUIS, OK 74866-0005
PO BOX 6, SAINT LOUIS, OK 74866-0006
PO BOX 7, SAINT LOUIS, OK 74866-0007
PO BOX 8, SAINT LOUIS, OK 74866-0008
PO BOX 9, SAINT LOUIS, OK 74866-0009
PO BOX 10, SAINT LOUIS, OK 74866-0010
PO BOX 11, SAINT LOUIS, OK 74866-0011
PO BOX 12, SAINT LOUIS, OK 74866-0012
PO BOX 13, SAINT LOUIS, OK 74866-0013
PO BOX 14, SAINT LOUIS, OK 74866-0014
PO BOX 15, SAINT LOUIS, OK 74866-0015
PO BOX 16, SAINT LOUIS, OK 74866-0016
PO BOX 17, SAINT LOUIS, OK 74866-0017
PO BOX 18, SAINT LOUIS, OK 74866-0018
PO BOX 19, SAINT LOUIS, OK 74866-0019
PO BOX 20, SAINT LOUIS, OK 74866-0020
PO BOX 21, SAINT LOUIS, OK 74866-0021
PO BOX 22, SAINT LOUIS, OK 74866-0022
PO BOX 23, SAINT LOUIS, OK 74866-0023
PO BOX 24, SAINT LOUIS, OK 74866-0024
PO BOX 25, SAINT LOUIS, OK 74866-0025
PO BOX 26, SAINT LOUIS, OK 74866-0026
PO BOX 27, SAINT LOUIS, OK 74866-0027
PO BOX 28, SAINT LOUIS, OK 74866-0028
PO BOX 29, SAINT LOUIS, OK 74866-0029
PO BOX 30, SAINT LOUIS, OK 74866-0030
PO BOX 31, SAINT LOUIS, OK 74866-0031
PO BOX 32, SAINT LOUIS, OK 74866-0032
PO BOX 33, SAINT LOUIS, OK 74866-0033
PO BOX 34, SAINT LOUIS, OK 74866-0034
PO BOX 35, SAINT LOUIS, OK 74866-0035
PO BOX 36, SAINT LOUIS, OK 74866-0036
PO BOX 37, SAINT LOUIS, OK 74866-0037
PO BOX 38, SAINT LOUIS, OK 74866-0038
PO BOX 39, SAINT LOUIS, OK 74866-0039
PO BOX 40, SAINT LOUIS, OK 74866-0040
PO BOX 41, SAINT LOUIS, OK 74866-0041
PO BOX 42, SAINT LOUIS, OK 74866-0042
PO BOX 43, SAINT LOUIS, OK 74866-0043
PO BOX 44, SAINT LOUIS, OK 74866-0044
PO BOX 45, SAINT LOUIS, OK 74866-0045
PO BOX 46, SAINT LOUIS, OK 74866-0046
PO BOX 47, SAINT LOUIS, OK 74866-0047
PO BOX 48, SAINT LOUIS, OK 74866-0048
PO BOX 49, SAINT LOUIS, OK 74866-0049
PO BOX 50, SAINT LOUIS, OK 74866-0050
PO BOX 51, SAINT LOUIS, OK 74866-0051
PO BOX 52, SAINT LOUIS, OK 74866-0052
PO BOX 53, SAINT LOUIS, OK 74866-0053
PO BOX 54, SAINT LOUIS, OK 74866-0054
PO BOX 55, SAINT LOUIS, OK 74866-0055
PO BOX 56, SAINT LOUIS, OK 74866-0056
PO BOX 57, SAINT LOUIS, OK 74866-0057
PO BOX 58, SAINT LOUIS, OK 74866-0058
PO BOX 59, SAINT LOUIS, OK 74866-0059
PO BOX 60, SAINT LOUIS, OK 74866-0060
PO BOX 61, SAINT LOUIS, OK 74866-0061
PO BOX 62, SAINT LOUIS, OK 74866-0062
PO BOX 63, SAINT LOUIS, OK 74866-0063
PO BOX 64, SAINT LOUIS, OK 74866-0064
PO BOX 65, SAINT LOUIS, OK 74866-0065
PO BOX 66, SAINT LOUIS, OK 74866-0066
PO BOX 67, SAINT LOUIS, OK 74866-0067
PO BOX 68, SAINT LOUIS, OK 74866-0068
PO BOX 69, SAINT LOUIS, OK 74866-0069
PO BOX 70, SAINT LOUIS, OK 74866-0070
PO BOX 71, SAINT LOUIS, OK 74866-0071
PO BOX 72, SAINT LOUIS, OK 74866-0072
PO BOX 73, SAINT LOUIS, OK 74866-0073
PO BOX 74, SAINT LOUIS, OK 74866-0074
PO BOX 75, SAINT LOUIS, OK 74866-0075
PO BOX 76, SAINT LOUIS, OK 74866-0076
PO BOX 77, SAINT LOUIS, OK 74866-0077
PO BOX 78, SAINT LOUIS, OK 74866-0078
PO BOX 79, SAINT LOUIS, OK 74866-0079
PO BOX 80, SAINT LOUIS, OK 74866-0080
PO BOX 81, SAINT LOUIS, OK 74866-0081
PO BOX 82, SAINT LOUIS, OK 74866-0082
PO BOX 83, SAINT LOUIS, OK 74866-0083
PO BOX 84, SAINT LOUIS, OK 74866-0084
PO BOX 85, SAINT LOUIS, OK 74866-0085
PO BOX 86, SAINT LOUIS, OK 74866-0086
PO BOX 87, SAINT LOUIS, OK 74866-0087
PO BOX 88, SAINT LOUIS, OK 74866-0088
PO BOX 89, SAINT LOUIS, OK 74866-0089
PO BOX 90, SAINT LOUIS, OK 74866-0090
PO BOX 91, SAINT LOUIS, OK 74866-0091
PO BOX 92, SAINT LOUIS, OK 74866-0092
PO BOX 93, SAINT LOUIS, OK 74866-0093
PO BOX 94, SAINT LOUIS, OK 74866-0094
PO BOX 95, SAINT LOUIS, OK 74866-0095
PO BOX 96, SAINT LOUIS, OK 74866-0096
PO BOX 97, SAINT LOUIS, OK 74866-0097
PO BOX 98, SAINT LOUIS, OK 74866-0098
PO BOX 99, SAINT LOUIS, OK 74866-0099
PO BOX 100, SAINT LOUIS, OK 74866-0100
PO BOX 101, SAINT LOUIS, OK 74866-0101
PO BOX 102, SAINT LOUIS, OK 74866-0102
PO BOX 103, SAINT LOUIS, OK 74866-0103
PO BOX 104, SAINT LOUIS, OK 74866-0104
PO BOX 105, SAINT LOUIS, OK 74866-0105
PO BOX 106, SAINT LOUIS, OK 74866-0106
PO BOX 107, SAINT LOUIS, OK 74866-0107
PO BOX 108, SAINT LOUIS, OK 74866-0108
PO BOX 109, SAINT LOUIS, OK 74866-0109
PO BOX 110, SAINT LOUIS, OK 74866-0110
PO BOX 111, SAINT LOUIS, OK 74866-0111
PO BOX 112, SAINT LOUIS, OK 74866-0112
PO BOX 113, SAINT LOUIS, OK 74866-0113
PO BOX 114, SAINT LOUIS, OK 74866-0114
PO BOX 115, SAINT LOUIS, OK 74866-0115
PO BOX 116, SAINT LOUIS, OK 74866-0116
PO BOX 117, SAINT LOUIS, OK 74866-0117
PO BOX 118, SAINT LOUIS, OK 74866-0118
PO BOX 119, SAINT LOUIS, OK 74866-0119
PO BOX 120, SAINT LOUIS, OK 74866-0120
PO BOX 121, SAINT LOUIS, OK 74866-0121
PO BOX 122, SAINT LOUIS, OK 74866-0122
PO BOX 123, SAINT LOUIS, OK 74866-0123
PO BOX 124, SAINT LOUIS, OK 74866-0124
PO BOX 125, SAINT LOUIS, OK 74866-0125
PO BOX 126, SAINT LOUIS, OK 74866-0126
PO BOX 127, SAINT LOUIS, OK 74866-0127
PO BOX 128, SAINT LOUIS, OK 74866-0128
PO BOX 129, SAINT LOUIS, OK 74866-0129
PO BOX 130, SAINT LOUIS, OK 74866-0130
PO BOX 131, SAINT LOUIS, OK 74866-0131
PO BOX 132, SAINT LOUIS, OK 74866-0132
PO BOX 133, SAINT LOUIS, OK 74866-0133
PO BOX 134, SAINT LOUIS, OK 74866-0134
PO BOX 135, SAINT LOUIS, OK 74866-0135
PO BOX 136, SAINT LOUIS, OK 74866-0136
PO BOX 137, SAINT LOUIS, OK 74866-0137
PO BOX 138, SAINT LOUIS, OK 74866-0138
PO BOX 139, SAINT LOUIS, OK 74866-0139
PO BOX 140, SAINT LOUIS, OK 74866-0140
PO BOX 141, SAINT LOUIS, OK 74866-0141
PO BOX 142, SAINT LOUIS, OK 74866-0142
PO BOX 143, SAINT LOUIS, OK 74866-0143
PO BOX 144, SAINT LOUIS, OK 74866-0144
PO BOX 145, SAINT LOUIS, OK 74866-0145
PO BOX 146, SAINT LOUIS, OK 74866-0146
PO BOX 147, SAINT LOUIS, OK 74866-0147
PO BOX 148, SAINT LOUIS, OK 74866-0148
PO BOX 149, SAINT LOUIS, OK 74866-0149
PO BOX 150, SAINT LOUIS, OK 74866-0150
PO BOX 151, SAINT LOUIS, OK 74866-0151
PO BOX 152, SAINT LOUIS, OK 74866-0152
PO BOX 153, SAINT LOUIS, OK 74866-0153
PO BOX 154, SAINT LOUIS, OK 74866-0154
PO BOX 155, SAINT LOUIS, OK 74866-0155
PO BOX 156, SAINT LOUIS, OK 74866-0156
PO BOX 157, SAINT LOUIS, OK 74866-0157
PO BOX 158, SAINT LOUIS, OK 74866-0158
PO BOX 159, SAINT LOUIS, OK 74866-0159
PO BOX 160, SAINT LOUIS, OK 74866-0160
PO BOX 161, SAINT LOUIS, OK 74866-0161
PO BOX 162, SAINT LOUIS, OK 74866-0162
PO BOX 163, SAINT LOUIS, OK 74866-0163
PO BOX 164, SAINT LOUIS, OK 74866-0164
PO BOX 165, SAINT LOUIS, OK 74866-0165
PO BOX 166, SAINT LOUIS, OK 74866-0166
PO BOX 167, SAINT LOUIS, OK 74866-0167
PO BOX 168, SAINT LOUIS, OK 74866-0168
PO BOX 169, SAINT LOUIS, OK 74866-0169
PO BOX 170, SAINT LOUIS, OK 74866-0170
PO BOX 171, SAINT LOUIS, OK 74866-0171
PO BOX 172, SAINT LOUIS, OK 74866-0172
PO BOX 173, SAINT LOUIS, OK 74866-0173
PO BOX 174, SAINT LOUIS, OK 74866-0174
PO BOX 175, SAINT LOUIS, OK 74866-0175
PO BOX 176, SAINT LOUIS, OK 74866-0176
PO BOX 177, SAINT LOUIS, OK 74866-0177
PO BOX 178, SAINT LOUIS, OK 74866-0178
PO BOX 179, SAINT LOUIS, OK 74866-0179
PO BOX 180, SAINT LOUIS, OK 74866-0180
PO BOX 181, SAINT LOUIS, OK 74866-0181
PO BOX 182, SAINT LOUIS, OK 74866-0182
PO BOX 183, SAINT LOUIS, OK 74866-0183
PO BOX 184, SAINT LOUIS, OK 74866-0184
PO BOX 185, SAINT LOUIS, OK 74866-0185
PO BOX 186, SAINT LOUIS, OK 74866-0186
PO BOX 187, SAINT LOUIS, OK 74866-0187
PO BOX 188, SAINT LOUIS, OK 74866-0188
PO BOX 189, SAINT LOUIS, OK 74866-0189
PO BOX 190, SAINT LOUIS, OK 74866-0190
PO BOX 191, SAINT LOUIS, OK 74866-0191
PO BOX 192, SAINT LOUIS, OK 74866-0192
PO BOX 193, SAINT LOUIS, OK 74866-0193
PO BOX 194, SAINT LOUIS, OK 74866-0194
PO BOX 195, SAINT LOUIS, OK 74866-0195
PO BOX 196, SAINT LOUIS, OK 74866-0196
PO BOX 197, SAINT LOUIS, OK 74866-0197
PO BOX 198, SAINT LOUIS, OK 74866-0198
PO BOX 199, SAINT LOUIS, OK 74866-0199
PO BOX 200, SAINT LOUIS, OK 74866-0200
PO BOX 201, SAINT LOUIS, OK 74866-0201
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