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 11001, OKLAHOMA CITY, OK 73136-0001
PO BOX 11002, OKLAHOMA CITY, OK 73136-0002
PO BOX 11003, OKLAHOMA CITY, OK 73136-0003
PO BOX 11004, OKLAHOMA CITY, OK 73136-0004
PO BOX 11005, OKLAHOMA CITY, OK 73136-0005
PO BOX 11006, OKLAHOMA CITY, OK 73136-0006
PO BOX 11007, OKLAHOMA CITY, OK 73136-0007
PO BOX 11008, OKLAHOMA CITY, OK 73136-0008
PO BOX 11009, OKLAHOMA CITY, OK 73136-0009
PO BOX 11010, OKLAHOMA CITY, OK 73136-0010
PO BOX 11011, OKLAHOMA CITY, OK 73136-0011
PO BOX 11012, OKLAHOMA CITY, OK 73136-0012
PO BOX 11013, OKLAHOMA CITY, OK 73136-0013
PO BOX 11014, OKLAHOMA CITY, OK 73136-0014
PO BOX 11015, OKLAHOMA CITY, OK 73136-0015
PO BOX 11016, OKLAHOMA CITY, OK 73136-0016
PO BOX 11017, OKLAHOMA CITY, OK 73136-0017
PO BOX 11018, OKLAHOMA CITY, OK 73136-0018
PO BOX 11019, OKLAHOMA CITY, OK 73136-0019
PO BOX 11020, OKLAHOMA CITY, OK 73136-0020
PO BOX 11021, OKLAHOMA CITY, OK 73136-0021
PO BOX 11022, OKLAHOMA CITY, OK 73136-0022
PO BOX 11023, OKLAHOMA CITY, OK 73136-0023
PO BOX 11024, OKLAHOMA CITY, OK 73136-0024
PO BOX 11025, OKLAHOMA CITY, OK 73136-0025
PO BOX 11026, OKLAHOMA CITY, OK 73136-0026
PO BOX 11027, OKLAHOMA CITY, OK 73136-0027
PO BOX 11028, OKLAHOMA CITY, OK 73136-0028
PO BOX 11029, OKLAHOMA CITY, OK 73136-0029
PO BOX 11030, OKLAHOMA CITY, OK 73136-0030
PO BOX 11031, OKLAHOMA CITY, OK 73136-0031
PO BOX 11032, OKLAHOMA CITY, OK 73136-0032
PO BOX 11033, OKLAHOMA CITY, OK 73136-0033
PO BOX 11034, OKLAHOMA CITY, OK 73136-0034
PO BOX 11035, OKLAHOMA CITY, OK 73136-0035
PO BOX 11036, OKLAHOMA CITY, OK 73136-0036
PO BOX 11037, OKLAHOMA CITY, OK 73136-0037
PO BOX 11038, OKLAHOMA CITY, OK 73136-0038
PO BOX 11039, OKLAHOMA CITY, OK 73136-0039
PO BOX 11040, OKLAHOMA CITY, OK 73136-0040
PO BOX 11041, OKLAHOMA CITY, OK 73136-0041
PO BOX 11042, OKLAHOMA CITY, OK 73136-0042
PO BOX 11043, OKLAHOMA CITY, OK 73136-0043
PO BOX 11044, OKLAHOMA CITY, OK 73136-0044
PO BOX 11045, OKLAHOMA CITY, OK 73136-0045
PO BOX 11046, OKLAHOMA CITY, OK 73136-0046
PO BOX 11047, OKLAHOMA CITY, OK 73136-0047
PO BOX 11048, OKLAHOMA CITY, OK 73136-0048
PO BOX 11049, OKLAHOMA CITY, OK 73136-0049
PO BOX 11050, OKLAHOMA CITY, OK 73136-0050
PO BOX 11051, OKLAHOMA CITY, OK 73136-0051
PO BOX 11052, OKLAHOMA CITY, OK 73136-0052
PO BOX 11053, OKLAHOMA CITY, OK 73136-0053
PO BOX 11054, OKLAHOMA CITY, OK 73136-0054
PO BOX 11055, OKLAHOMA CITY, OK 73136-0055
PO BOX 11056, OKLAHOMA CITY, OK 73136-0056
PO BOX 11057, OKLAHOMA CITY, OK 73136-0057
PO BOX 11058, OKLAHOMA CITY, OK 73136-0058
PO BOX 11059, OKLAHOMA CITY, OK 73136-0059
PO BOX 11060, OKLAHOMA CITY, OK 73136-0060
PO BOX 11061, OKLAHOMA CITY, OK 73136-0061
PO BOX 11062, OKLAHOMA CITY, OK 73136-0062
PO BOX 11063, OKLAHOMA CITY, OK 73136-0063
PO BOX 11064, OKLAHOMA CITY, OK 73136-0064
PO BOX 11065, OKLAHOMA CITY, OK 73136-0065
PO BOX 11066, OKLAHOMA CITY, OK 73136-0066
PO BOX 11067, OKLAHOMA CITY, OK 73136-0067
PO BOX 11068, OKLAHOMA CITY, OK 73136-0068
PO BOX 11069, OKLAHOMA CITY, OK 73136-0069
PO BOX 11070, OKLAHOMA CITY, OK 73136-0070
PO BOX 11071, OKLAHOMA CITY, OK 73136-0071
PO BOX 11072, OKLAHOMA CITY, OK 73136-0072
PO BOX 11073, OKLAHOMA CITY, OK 73136-0073
PO BOX 11074, OKLAHOMA CITY, OK 73136-0074
PO BOX 11075, OKLAHOMA CITY, OK 73136-0075
PO BOX 11076, OKLAHOMA CITY, OK 73136-0076
PO BOX 11077, OKLAHOMA CITY, OK 73136-0077
PO BOX 11078, OKLAHOMA CITY, OK 73136-0078
PO BOX 11079, OKLAHOMA CITY, OK 73136-0079
PO BOX 11080, OKLAHOMA CITY, OK 73136-0080
PO BOX 11081, OKLAHOMA CITY, OK 73136-0081
PO BOX 11082, OKLAHOMA CITY, OK 73136-0082
PO BOX 11083, OKLAHOMA CITY, OK 73136-0083
PO BOX 11084, OKLAHOMA CITY, OK 73136-0084
PO BOX 11085, OKLAHOMA CITY, OK 73136-0085
PO BOX 11086, OKLAHOMA CITY, OK 73136-0086
PO BOX 11087, OKLAHOMA CITY, OK 73136-0087
PO BOX 11088, OKLAHOMA CITY, OK 73136-0088
PO BOX 11089, OKLAHOMA CITY, OK 73136-0089
PO BOX 11090, OKLAHOMA CITY, OK 73136-0090
PO BOX 11091, OKLAHOMA CITY, OK 73136-0091
PO BOX 11092, OKLAHOMA CITY, OK 73136-0092
PO BOX 11093, OKLAHOMA CITY, OK 73136-0093
PO BOX 11094, OKLAHOMA CITY, OK 73136-0094
PO BOX 11095, OKLAHOMA CITY, OK 73136-0095
PO BOX 11096, OKLAHOMA CITY, OK 73136-0096
PO BOX 11097, OKLAHOMA CITY, OK 73136-0097
PO BOX 11098, OKLAHOMA CITY, OK 73136-0098
PO BOX 11099, OKLAHOMA CITY, OK 73136-0099
PO BOX 11100, OKLAHOMA CITY, OK 73136-0100
PO BOX 11101, OKLAHOMA CITY, OK 73136-0101
PO BOX 11102, OKLAHOMA CITY, OK 73136-0102
PO BOX 11103, OKLAHOMA CITY, OK 73136-0103
PO BOX 11104, OKLAHOMA CITY, OK 73136-0104
PO BOX 11105, OKLAHOMA CITY, OK 73136-0105
PO BOX 11106, OKLAHOMA CITY, OK 73136-0106
PO BOX 11107, OKLAHOMA CITY, OK 73136-0107
PO BOX 11108, OKLAHOMA CITY, OK 73136-0108
PO BOX 11109, OKLAHOMA CITY, OK 73136-0109
PO BOX 11110, OKLAHOMA CITY, OK 73136-0110
PO BOX 11111, OKLAHOMA CITY, OK 73136-0111
PO BOX 11112, OKLAHOMA CITY, OK 73136-0112
PO BOX 11113, OKLAHOMA CITY, OK 73136-0113
PO BOX 11114, OKLAHOMA CITY, OK 73136-0114
PO BOX 11115, OKLAHOMA CITY, OK 73136-0115
PO BOX 11116, OKLAHOMA CITY, OK 73136-0116
PO BOX 11117, OKLAHOMA CITY, OK 73136-0117
PO BOX 11118, OKLAHOMA CITY, OK 73136-0118
PO BOX 11119, OKLAHOMA CITY, OK 73136-0119
PO BOX 11120, OKLAHOMA CITY, OK 73136-0120
PO BOX 11121, OKLAHOMA CITY, OK 73136-0121
PO BOX 11122, OKLAHOMA CITY, OK 73136-0122
PO BOX 11123, OKLAHOMA CITY, OK 73136-0123
PO BOX 11124, OKLAHOMA CITY, OK 73136-0124
PO BOX 11125, OKLAHOMA CITY, OK 73136-0125
PO BOX 11126, OKLAHOMA CITY, OK 73136-0126
PO BOX 11127, OKLAHOMA CITY, OK 73136-0127
PO BOX 11128, OKLAHOMA CITY, OK 73136-0128
PO BOX 11129, OKLAHOMA CITY, OK 73136-0129
PO BOX 11130, OKLAHOMA CITY, OK 73136-0130
PO BOX 11131, OKLAHOMA CITY, OK 73136-0131
PO BOX 11132, OKLAHOMA CITY, OK 73136-0132
PO BOX 11133, OKLAHOMA CITY, OK 73136-0133
PO BOX 11134, OKLAHOMA CITY, OK 73136-0134
PO BOX 11135, OKLAHOMA CITY, OK 73136-0135
PO BOX 11136, OKLAHOMA CITY, OK 73136-0136
PO BOX 11137, OKLAHOMA CITY, OK 73136-0137
PO BOX 11138, OKLAHOMA CITY, OK 73136-0138
PO BOX 11139, OKLAHOMA CITY, OK 73136-0139
PO BOX 11140, OKLAHOMA CITY, OK 73136-0140
PO BOX 11141, OKLAHOMA CITY, OK 73136-0141
PO BOX 11142, OKLAHOMA CITY, OK 73136-0142
PO BOX 11143, OKLAHOMA CITY, OK 73136-0143
PO BOX 11144, OKLAHOMA CITY, OK 73136-0144
PO BOX 11145, OKLAHOMA CITY, OK 73136-0145
PO BOX 11146, OKLAHOMA CITY, OK 73136-0146
PO BOX 11147, OKLAHOMA CITY, OK 73136-0147
PO BOX 11148, OKLAHOMA CITY, OK 73136-0148
PO BOX 11149, OKLAHOMA CITY, OK 73136-0149
PO BOX 11150, OKLAHOMA CITY, OK 73136-0150
PO BOX 11151, OKLAHOMA CITY, OK 73136-0151
PO BOX 11152, OKLAHOMA CITY, OK 73136-0152
PO BOX 11153, OKLAHOMA CITY, OK 73136-0153
PO BOX 11154, OKLAHOMA CITY, OK 73136-0154
PO BOX 11155, OKLAHOMA CITY, OK 73136-0155
PO BOX 11156, OKLAHOMA CITY, OK 73136-0156
PO BOX 11157, OKLAHOMA CITY, OK 73136-0157
PO BOX 11158, OKLAHOMA CITY, OK 73136-0158
PO BOX 11159, OKLAHOMA CITY, OK 73136-0159
PO BOX 11160, OKLAHOMA CITY, OK 73136-0160
PO BOX 11161, OKLAHOMA CITY, OK 73136-0161
PO BOX 11162, OKLAHOMA CITY, OK 73136-0162
PO BOX 11163, OKLAHOMA CITY, OK 73136-0163
PO BOX 11164, OKLAHOMA CITY, OK 73136-0164
PO BOX 11165, OKLAHOMA CITY, OK 73136-0165
PO BOX 11166, OKLAHOMA CITY, OK 73136-0166
PO BOX 11167, OKLAHOMA CITY, OK 73136-0167
PO BOX 11168, OKLAHOMA CITY, OK 73136-0168
PO BOX 11169, OKLAHOMA CITY, OK 73136-0169
PO BOX 11170, OKLAHOMA CITY, OK 73136-0170
PO BOX 11171, OKLAHOMA CITY, OK 73136-0171
PO BOX 11172, OKLAHOMA CITY, OK 73136-0172
PO BOX 11173, OKLAHOMA CITY, OK 73136-0173
PO BOX 11174, OKLAHOMA CITY, OK 73136-0174
PO BOX 11175, OKLAHOMA CITY, OK 73136-0175
PO BOX 11176, OKLAHOMA CITY, OK 73136-0176
PO BOX 11177, OKLAHOMA CITY, OK 73136-0177
PO BOX 11178, OKLAHOMA CITY, OK 73136-0178
PO BOX 11179, OKLAHOMA CITY, OK 73136-0179
PO BOX 11180, OKLAHOMA CITY, OK 73136-0180
PO BOX 11181, OKLAHOMA CITY, OK 73136-0181
PO BOX 11182, OKLAHOMA CITY, OK 73136-0182
PO BOX 11183, OKLAHOMA CITY, OK 73136-0183
PO BOX 11184, OKLAHOMA CITY, OK 73136-0184
PO BOX 11185, OKLAHOMA CITY, OK 73136-0185
PO BOX 11186, OKLAHOMA CITY, OK 73136-0186
PO BOX 11187, OKLAHOMA CITY, OK 73136-0187
PO BOX 11188, OKLAHOMA CITY, OK 73136-0188
PO BOX 11189, OKLAHOMA CITY, OK 73136-0189
PO BOX 11190, OKLAHOMA CITY, OK 73136-0190
PO BOX 11191, OKLAHOMA CITY, OK 73136-0191
PO BOX 11192, OKLAHOMA CITY, OK 73136-0192
PO BOX 11193, OKLAHOMA CITY, OK 73136-0193
PO BOX 11194, OKLAHOMA CITY, OK 73136-0194
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