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 28001, SAN DIEGO, CA 92198-0001
PO BOX 28002, SAN DIEGO, CA 92198-0002
PO BOX 28003, SAN DIEGO, CA 92198-0003
PO BOX 28004, SAN DIEGO, CA 92198-0004
PO BOX 28005, SAN DIEGO, CA 92198-0005
PO BOX 28006, SAN DIEGO, CA 92198-0006
PO BOX 28007, SAN DIEGO, CA 92198-0007
PO BOX 28008, SAN DIEGO, CA 92198-0008
PO BOX 28009, SAN DIEGO, CA 92198-0009
PO BOX 28010, SAN DIEGO, CA 92198-0010
PO BOX 28011, SAN DIEGO, CA 92198-0011
PO BOX 28012, SAN DIEGO, CA 92198-0012
PO BOX 28013, SAN DIEGO, CA 92198-0013
PO BOX 28014, SAN DIEGO, CA 92198-0014
PO BOX 28015, SAN DIEGO, CA 92198-0015
PO BOX 28016, SAN DIEGO, CA 92198-0016
PO BOX 28017, SAN DIEGO, CA 92198-0017
PO BOX 28018, SAN DIEGO, CA 92198-0018
PO BOX 28019, SAN DIEGO, CA 92198-0019
PO BOX 28020, SAN DIEGO, CA 92198-0020
PO BOX 28021, SAN DIEGO, CA 92198-0021
PO BOX 28022, SAN DIEGO, CA 92198-0022
PO BOX 28023, SAN DIEGO, CA 92198-0023
PO BOX 28024, SAN DIEGO, CA 92198-0024
PO BOX 28025, SAN DIEGO, CA 92198-0025
PO BOX 28026, SAN DIEGO, CA 92198-0026
PO BOX 28027, SAN DIEGO, CA 92198-0027
PO BOX 28028, SAN DIEGO, CA 92198-0028
PO BOX 28029, SAN DIEGO, CA 92198-0029
PO BOX 28030, SAN DIEGO, CA 92198-0030
PO BOX 28031, SAN DIEGO, CA 92198-0031
PO BOX 28032, SAN DIEGO, CA 92198-0032
PO BOX 28033, SAN DIEGO, CA 92198-0033
PO BOX 28034, SAN DIEGO, CA 92198-0034
PO BOX 28035, SAN DIEGO, CA 92198-0035
PO BOX 28036, SAN DIEGO, CA 92198-0036
PO BOX 28037, SAN DIEGO, CA 92198-0037
PO BOX 28038, SAN DIEGO, CA 92198-0038
PO BOX 28039, SAN DIEGO, CA 92198-0039
PO BOX 28040, SAN DIEGO, CA 92198-0040
PO BOX 28041, SAN DIEGO, CA 92198-0041
PO BOX 28042, SAN DIEGO, CA 92198-0042
PO BOX 28043, SAN DIEGO, CA 92198-0043
PO BOX 28044, SAN DIEGO, CA 92198-0044
PO BOX 28045, SAN DIEGO, CA 92198-0045
PO BOX 28046, SAN DIEGO, CA 92198-0046
PO BOX 28047, SAN DIEGO, CA 92198-0047
PO BOX 28048, SAN DIEGO, CA 92198-0048
PO BOX 28049, SAN DIEGO, CA 92198-0049
PO BOX 28050, SAN DIEGO, CA 92198-0050
PO BOX 28051, SAN DIEGO, CA 92198-0051
PO BOX 28052, SAN DIEGO, CA 92198-0052
PO BOX 28053, SAN DIEGO, CA 92198-0053
PO BOX 28054, SAN DIEGO, CA 92198-0054
PO BOX 28055, SAN DIEGO, CA 92198-0055
PO BOX 28056, SAN DIEGO, CA 92198-0056
PO BOX 28057, SAN DIEGO, CA 92198-0057
PO BOX 28058, SAN DIEGO, CA 92198-0058
PO BOX 28059, SAN DIEGO, CA 92198-0059
PO BOX 28060, SAN DIEGO, CA 92198-0060
PO BOX 28061, SAN DIEGO, CA 92198-0061
PO BOX 28062, SAN DIEGO, CA 92198-0062
PO BOX 28063, SAN DIEGO, CA 92198-0063
PO BOX 28064, SAN DIEGO, CA 92198-0064
PO BOX 28065, SAN DIEGO, CA 92198-0065
PO BOX 28066, SAN DIEGO, CA 92198-0066
PO BOX 28067, SAN DIEGO, CA 92198-0067
PO BOX 28068, SAN DIEGO, CA 92198-0068
PO BOX 28069, SAN DIEGO, CA 92198-0069
PO BOX 28070, SAN DIEGO, CA 92198-0070
PO BOX 28071, SAN DIEGO, CA 92198-0071
PO BOX 28072, SAN DIEGO, CA 92198-0072
PO BOX 28073, SAN DIEGO, CA 92198-0073
PO BOX 28074, SAN DIEGO, CA 92198-0074
PO BOX 28075, SAN DIEGO, CA 92198-0075
PO BOX 28076, SAN DIEGO, CA 92198-0076
PO BOX 28077, SAN DIEGO, CA 92198-0077
PO BOX 28078, SAN DIEGO, CA 92198-0078
PO BOX 28079, SAN DIEGO, CA 92198-0079
PO BOX 28080, SAN DIEGO, CA 92198-0080
PO BOX 28081, SAN DIEGO, CA 92198-0081
PO BOX 28082, SAN DIEGO, CA 92198-0082
PO BOX 28083, SAN DIEGO, CA 92198-0083
PO BOX 28084, SAN DIEGO, CA 92198-0084
PO BOX 28085, SAN DIEGO, CA 92198-0085
PO BOX 28086, SAN DIEGO, CA 92198-0086
PO BOX 28087, SAN DIEGO, CA 92198-0087
PO BOX 28088, SAN DIEGO, CA 92198-0088
PO BOX 28089, SAN DIEGO, CA 92198-0089
PO BOX 28090, SAN DIEGO, CA 92198-0090
PO BOX 28091, SAN DIEGO, CA 92198-0091
PO BOX 28092, SAN DIEGO, CA 92198-0092
PO BOX 28093, SAN DIEGO, CA 92198-0093
PO BOX 28094, SAN DIEGO, CA 92198-0094
PO BOX 28095, SAN DIEGO, CA 92198-0095
PO BOX 28096, SAN DIEGO, CA 92198-0096
PO BOX 28097, SAN DIEGO, CA 92198-0097
PO BOX 28098, SAN DIEGO, CA 92198-0098
PO BOX 28099, SAN DIEGO, CA 92198-0099
PO BOX 28100, SAN DIEGO, CA 92198-0100
PO BOX 28101, SAN DIEGO, CA 92198-0101
PO BOX 28102, SAN DIEGO, CA 92198-0102
PO BOX 28103, SAN DIEGO, CA 92198-0103
PO BOX 28104, SAN DIEGO, CA 92198-0104
PO BOX 28105, SAN DIEGO, CA 92198-0105
PO BOX 28106, SAN DIEGO, CA 92198-0106
PO BOX 28107, SAN DIEGO, CA 92198-0107
PO BOX 28108, SAN DIEGO, CA 92198-0108
PO BOX 28109, SAN DIEGO, CA 92198-0109
PO BOX 28110, SAN DIEGO, CA 92198-0110
PO BOX 28111, SAN DIEGO, CA 92198-0111
PO BOX 28112, SAN DIEGO, CA 92198-0112
PO BOX 28113, SAN DIEGO, CA 92198-0113
PO BOX 28114, SAN DIEGO, CA 92198-0114
PO BOX 28115, SAN DIEGO, CA 92198-0115
PO BOX 28116, SAN DIEGO, CA 92198-0116
PO BOX 28117, SAN DIEGO, CA 92198-0117
PO BOX 28118, SAN DIEGO, CA 92198-0118
PO BOX 28119, SAN DIEGO, CA 92198-0119
PO BOX 28120, SAN DIEGO, CA 92198-0120
PO BOX 28121, SAN DIEGO, CA 92198-0121
PO BOX 28122, SAN DIEGO, CA 92198-0122
PO BOX 28123, SAN DIEGO, CA 92198-0123
PO BOX 28124, SAN DIEGO, CA 92198-0124
PO BOX 28125, SAN DIEGO, CA 92198-0125
PO BOX 28126, SAN DIEGO, CA 92198-0126
PO BOX 28127, SAN DIEGO, CA 92198-0127
PO BOX 28128, SAN DIEGO, CA 92198-0128
PO BOX 28129, SAN DIEGO, CA 92198-0129
PO BOX 28130, SAN DIEGO, CA 92198-0130
PO BOX 28131, SAN DIEGO, CA 92198-0131
PO BOX 28132, SAN DIEGO, CA 92198-0132
PO BOX 28133, SAN DIEGO, CA 92198-0133
PO BOX 28134, SAN DIEGO, CA 92198-0134
PO BOX 28135, SAN DIEGO, CA 92198-0135
PO BOX 28136, SAN DIEGO, CA 92198-0136
PO BOX 28137, SAN DIEGO, CA 92198-0137
PO BOX 28138, SAN DIEGO, CA 92198-0138
PO BOX 28139, SAN DIEGO, CA 92198-0139
PO BOX 28140, SAN DIEGO, CA 92198-0140
PO BOX 28141, SAN DIEGO, CA 92198-0141
PO BOX 28142, SAN DIEGO, CA 92198-0142
PO BOX 28143, SAN DIEGO, CA 92198-0143
PO BOX 28144, SAN DIEGO, CA 92198-0144
PO BOX 28145, SAN DIEGO, CA 92198-0145
PO BOX 28146, SAN DIEGO, CA 92198-0146
PO BOX 28147, SAN DIEGO, CA 92198-0147
PO BOX 28148, SAN DIEGO, CA 92198-0148
PO BOX 28149, SAN DIEGO, CA 92198-0149
PO BOX 28150, SAN DIEGO, CA 92198-0150
PO BOX 28151, SAN DIEGO, CA 92198-0151
PO BOX 28152, SAN DIEGO, CA 92198-0152
PO BOX 28153, SAN DIEGO, CA 92198-0153
PO BOX 28154, SAN DIEGO, CA 92198-0154
PO BOX 28155, SAN DIEGO, CA 92198-0155
PO BOX 28156, SAN DIEGO, CA 92198-0156
PO BOX 28157, SAN DIEGO, CA 92198-0157
PO BOX 28158, SAN DIEGO, CA 92198-0158
PO BOX 28159, SAN DIEGO, CA 92198-0159
PO BOX 28160, SAN DIEGO, CA 92198-0160
PO BOX 28161, SAN DIEGO, CA 92198-0161
PO BOX 28162, SAN DIEGO, CA 92198-0162
PO BOX 28163, SAN DIEGO, CA 92198-0163
PO BOX 28164, SAN DIEGO, CA 92198-0164
PO BOX 28165, SAN DIEGO, CA 92198-0165
PO BOX 28166, SAN DIEGO, CA 92198-0166
PO BOX 28167, SAN DIEGO, CA 92198-0167
PO BOX 28168, SAN DIEGO, CA 92198-0168
PO BOX 28169, SAN DIEGO, CA 92198-0169
PO BOX 28170, SAN DIEGO, CA 92198-0170
PO BOX 28171, SAN DIEGO, CA 92198-0171
PO BOX 28172, SAN DIEGO, CA 92198-0172
PO BOX 28173, SAN DIEGO, CA 92198-0173
PO BOX 28174, SAN DIEGO, CA 92198-0174
PO BOX 28175, SAN DIEGO, CA 92198-0175
PO BOX 28176, SAN DIEGO, CA 92198-0176
PO BOX 28177, SAN DIEGO, CA 92198-0177
PO BOX 28178, SAN DIEGO, CA 92198-0178
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