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 50001, IDAHO FALLS, ID 83405-0001
PO BOX 50002, IDAHO FALLS, ID 83405-0002
PO BOX 50003, IDAHO FALLS, ID 83405-0003
PO BOX 50004, IDAHO FALLS, ID 83405-0004
PO BOX 50005, IDAHO FALLS, ID 83405-0005
PO BOX 50006, IDAHO FALLS, ID 83405-0006
PO BOX 50007, IDAHO FALLS, ID 83405-0007
PO BOX 50008, IDAHO FALLS, ID 83405-0008
PO BOX 50009, IDAHO FALLS, ID 83405-0009
PO BOX 50010, IDAHO FALLS, ID 83405-0010
PO BOX 50011, IDAHO FALLS, ID 83405-0011
PO BOX 50012, IDAHO FALLS, ID 83405-0012
PO BOX 50013, IDAHO FALLS, ID 83405-0013
PO BOX 50014, IDAHO FALLS, ID 83405-0014
PO BOX 50015, IDAHO FALLS, ID 83405-0015
PO BOX 50016, IDAHO FALLS, ID 83405-0016
PO BOX 50017, IDAHO FALLS, ID 83405-0017
PO BOX 50018, IDAHO FALLS, ID 83405-0018
PO BOX 50019, IDAHO FALLS, ID 83405-0019
PO BOX 50020, IDAHO FALLS, ID 83405-0020
PO BOX 50021, IDAHO FALLS, ID 83405-0021
PO BOX 50022, IDAHO FALLS, ID 83405-0022
PO BOX 50023, IDAHO FALLS, ID 83405-0023
PO BOX 50024, IDAHO FALLS, ID 83405-0024
PO BOX 50025, IDAHO FALLS, ID 83405-0025
PO BOX 50026, IDAHO FALLS, ID 83405-0026
PO BOX 50027, IDAHO FALLS, ID 83405-0027
PO BOX 50028, IDAHO FALLS, ID 83405-0028
PO BOX 50029, IDAHO FALLS, ID 83405-0029
PO BOX 50030, IDAHO FALLS, ID 83405-0030
PO BOX 50031, IDAHO FALLS, ID 83405-0031
PO BOX 50032, IDAHO FALLS, ID 83405-0032
PO BOX 50033, IDAHO FALLS, ID 83405-0033
PO BOX 50034, IDAHO FALLS, ID 83405-0034
PO BOX 50035, IDAHO FALLS, ID 83405-0035
PO BOX 50036, IDAHO FALLS, ID 83405-0036
PO BOX 50037, IDAHO FALLS, ID 83405-0037
PO BOX 50038, IDAHO FALLS, ID 83405-0038
PO BOX 50039, IDAHO FALLS, ID 83405-0039
PO BOX 50040, IDAHO FALLS, ID 83405-0040
PO BOX 50041, IDAHO FALLS, ID 83405-0041
PO BOX 50042, IDAHO FALLS, ID 83405-0042
PO BOX 50043, IDAHO FALLS, ID 83405-0043
PO BOX 50044, IDAHO FALLS, ID 83405-0044
PO BOX 50045, IDAHO FALLS, ID 83405-0045
PO BOX 50046, IDAHO FALLS, ID 83405-0046
PO BOX 50047, IDAHO FALLS, ID 83405-0047
PO BOX 50048, IDAHO FALLS, ID 83405-0048
PO BOX 50049, IDAHO FALLS, ID 83405-0049
PO BOX 50050, IDAHO FALLS, ID 83405-0050
PO BOX 50051, IDAHO FALLS, ID 83405-0051
PO BOX 50052, IDAHO FALLS, ID 83405-0052
PO BOX 50053, IDAHO FALLS, ID 83405-0053
PO BOX 50054, IDAHO FALLS, ID 83405-0054
PO BOX 50055, IDAHO FALLS, ID 83405-0055
PO BOX 50056, IDAHO FALLS, ID 83405-0056
PO BOX 50057, IDAHO FALLS, ID 83405-0057
PO BOX 50058, IDAHO FALLS, ID 83405-0058
PO BOX 50059, IDAHO FALLS, ID 83405-0059
PO BOX 50060, IDAHO FALLS, ID 83405-0060
PO BOX 50061, IDAHO FALLS, ID 83405-0061
PO BOX 50062, IDAHO FALLS, ID 83405-0062
PO BOX 50063, IDAHO FALLS, ID 83405-0063
PO BOX 50064, IDAHO FALLS, ID 83405-0064
PO BOX 50065, IDAHO FALLS, ID 83405-0065
PO BOX 50066, IDAHO FALLS, ID 83405-0066
PO BOX 50067, IDAHO FALLS, ID 83405-0067
PO BOX 50068, IDAHO FALLS, ID 83405-0068
PO BOX 50069, IDAHO FALLS, ID 83405-0069
PO BOX 50070, IDAHO FALLS, ID 83405-0070
PO BOX 50071, IDAHO FALLS, ID 83405-0071
PO BOX 50072, IDAHO FALLS, ID 83405-0072
PO BOX 50073, IDAHO FALLS, ID 83405-0073
PO BOX 50074, IDAHO FALLS, ID 83405-0074
PO BOX 50075, IDAHO FALLS, ID 83405-0075
PO BOX 50076, IDAHO FALLS, ID 83405-0076
PO BOX 50077, IDAHO FALLS, ID 83405-0077
PO BOX 50078, IDAHO FALLS, ID 83405-0078
PO BOX 50079, IDAHO FALLS, ID 83405-0079
PO BOX 50080, IDAHO FALLS, ID 83405-0080
PO BOX 50081, IDAHO FALLS, ID 83405-0081
PO BOX 50082, IDAHO FALLS, ID 83405-0082
PO BOX 50083, IDAHO FALLS, ID 83405-0083
PO BOX 50084, IDAHO FALLS, ID 83405-0084
PO BOX 50085, IDAHO FALLS, ID 83405-0085
PO BOX 50086, IDAHO FALLS, ID 83405-0086
PO BOX 50087, IDAHO FALLS, ID 83405-0087
PO BOX 50088, IDAHO FALLS, ID 83405-0088
PO BOX 50089, IDAHO FALLS, ID 83405-0089
PO BOX 50090, IDAHO FALLS, ID 83405-0090
PO BOX 50091, IDAHO FALLS, ID 83405-0091
PO BOX 50092, IDAHO FALLS, ID 83405-0092
PO BOX 50093, IDAHO FALLS, ID 83405-0093
PO BOX 50094, IDAHO FALLS, ID 83405-0094
PO BOX 50095, IDAHO FALLS, ID 83405-0095
PO BOX 50096, IDAHO FALLS, ID 83405-0096
PO BOX 50097, IDAHO FALLS, ID 83405-0097
PO BOX 50098, IDAHO FALLS, ID 83405-0098
PO BOX 50099, IDAHO FALLS, ID 83405-0099
PO BOX 50100, IDAHO FALLS, ID 83405-0100
PO BOX 50101, IDAHO FALLS, ID 83405-0101
PO BOX 50102, IDAHO FALLS, ID 83405-0102
PO BOX 50103, IDAHO FALLS, ID 83405-0103
PO BOX 50104, IDAHO FALLS, ID 83405-0104
PO BOX 50105, IDAHO FALLS, ID 83405-0105
PO BOX 50106, IDAHO FALLS, ID 83405-0106
PO BOX 50107, IDAHO FALLS, ID 83405-0107
PO BOX 50108, IDAHO FALLS, ID 83405-0108
PO BOX 50109, IDAHO FALLS, ID 83405-0109
PO BOX 50110, IDAHO FALLS, ID 83405-0110
PO BOX 50111, IDAHO FALLS, ID 83405-0111
PO BOX 50112, IDAHO FALLS, ID 83405-0112
PO BOX 50113, IDAHO FALLS, ID 83405-0113
PO BOX 50114, IDAHO FALLS, ID 83405-0114
PO BOX 50115, IDAHO FALLS, ID 83405-0115
PO BOX 50116, IDAHO FALLS, ID 83405-0116
PO BOX 50117, IDAHO FALLS, ID 83405-0117
PO BOX 50118, IDAHO FALLS, ID 83405-0118
PO BOX 50119, IDAHO FALLS, ID 83405-0119
PO BOX 50120, IDAHO FALLS, ID 83405-0120
PO BOX 50121, IDAHO FALLS, ID 83405-0121
PO BOX 50122, IDAHO FALLS, ID 83405-0122
PO BOX 50123, IDAHO FALLS, ID 83405-0123
PO BOX 50124, IDAHO FALLS, ID 83405-0124
PO BOX 50125, IDAHO FALLS, ID 83405-0125
PO BOX 50126, IDAHO FALLS, ID 83405-0126
PO BOX 50127, IDAHO FALLS, ID 83405-0127
PO BOX 50128, IDAHO FALLS, ID 83405-0128
PO BOX 50129, IDAHO FALLS, ID 83405-0129
PO BOX 50130, IDAHO FALLS, ID 83405-0130
PO BOX 50131, IDAHO FALLS, ID 83405-0131
PO BOX 50132, IDAHO FALLS, ID 83405-0132
PO BOX 50133, IDAHO FALLS, ID 83405-0133
PO BOX 50134, IDAHO FALLS, ID 83405-0134
PO BOX 50135, IDAHO FALLS, ID 83405-0135
PO BOX 50136, IDAHO FALLS, ID 83405-0136
PO BOX 50137, IDAHO FALLS, ID 83405-0137
PO BOX 50138, IDAHO FALLS, ID 83405-0138
PO BOX 50139, IDAHO FALLS, ID 83405-0139
PO BOX 50140, IDAHO FALLS, ID 83405-0140
PO BOX 50141, IDAHO FALLS, ID 83405-0141
PO BOX 50142, IDAHO FALLS, ID 83405-0142
PO BOX 50143, IDAHO FALLS, ID 83405-0143
PO BOX 50144, IDAHO FALLS, ID 83405-0144
PO BOX 50145, IDAHO FALLS, ID 83405-0145
PO BOX 50146, IDAHO FALLS, ID 83405-0146
PO BOX 50147, IDAHO FALLS, ID 83405-0147
PO BOX 50148, IDAHO FALLS, ID 83405-0148
PO BOX 50149, IDAHO FALLS, ID 83405-0149
PO BOX 50150, IDAHO FALLS, ID 83405-0150
PO BOX 50151, IDAHO FALLS, ID 83405-0151
PO BOX 50152, IDAHO FALLS, ID 83405-0152
PO BOX 50153, IDAHO FALLS, ID 83405-0153
PO BOX 50154, IDAHO FALLS, ID 83405-0154
PO BOX 50155, IDAHO FALLS, ID 83405-0155
PO BOX 50156, IDAHO FALLS, ID 83405-0156
PO BOX 50157, IDAHO FALLS, ID 83405-0157
PO BOX 50158, IDAHO FALLS, ID 83405-0158
PO BOX 50159, IDAHO FALLS, ID 83405-0159
PO BOX 50160, IDAHO FALLS, ID 83405-0160
PO BOX 50161, IDAHO FALLS, ID 83405-0161
PO BOX 50162, IDAHO FALLS, ID 83405-0162
PO BOX 50163, IDAHO FALLS, ID 83405-0163
PO BOX 50164, IDAHO FALLS, ID 83405-0164
PO BOX 50165, IDAHO FALLS, ID 83405-0165
PO BOX 50166, IDAHO FALLS, ID 83405-0166
PO BOX 50167, IDAHO FALLS, ID 83405-0167
PO BOX 50168, IDAHO FALLS, ID 83405-0168
PO BOX 50169, IDAHO FALLS, ID 83405-0169
PO BOX 50170, IDAHO FALLS, ID 83405-0170
PO BOX 50171, IDAHO FALLS, ID 83405-0171
PO BOX 50172, IDAHO FALLS, ID 83405-0172
PO BOX 50173, IDAHO FALLS, ID 83405-0173
PO BOX 50174, IDAHO FALLS, ID 83405-0174
PO BOX 50175, IDAHO FALLS, ID 83405-0175
PO BOX 50176, IDAHO FALLS, ID 83405-0176
PO BOX 50177, IDAHO FALLS, ID 83405-0177
PO BOX 50178, IDAHO FALLS, ID 83405-0178
PO BOX 50179, IDAHO FALLS, ID 83405-0179
PO BOX 50180, IDAHO FALLS, ID 83405-0180
PO BOX 50181, IDAHO FALLS, ID 83405-0181
PO BOX 50182, IDAHO FALLS, ID 83405-0182
PO BOX 50183, IDAHO FALLS, ID 83405-0183
PO BOX 50184, IDAHO FALLS, ID 83405-0184
PO BOX 50185, IDAHO FALLS, ID 83405-0185
PO BOX 50186, IDAHO FALLS, ID 83405-0186
PO BOX 50187, IDAHO FALLS, ID 83405-0187
PO BOX 50188, IDAHO FALLS, ID 83405-0188
PO BOX 50189, IDAHO FALLS, ID 83405-0189
PO BOX 50190, IDAHO FALLS, ID 83405-0190
PO BOX 50191, IDAHO FALLS, ID 83405-0191
PO BOX 50192, IDAHO FALLS, ID 83405-0192
PO BOX 50193, IDAHO FALLS, ID 83405-0193
PO BOX 50194, IDAHO FALLS, ID 83405-0194
PO BOX 50195, IDAHO FALLS, ID 83405-0195
PO BOX 50196, IDAHO FALLS, ID 83405-0196
PO BOX 50197, IDAHO FALLS, ID 83405-0197
PO BOX 50198, IDAHO FALLS, ID 83405-0198
PO BOX 50199, IDAHO FALLS, ID 83405-0199
PO BOX 50200, IDAHO FALLS, ID 83405-0200
PO BOX 50201, IDAHO FALLS, ID 83405-0201
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