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, OCEANSIDE, CA 92049-0001
PO BOX 2, OCEANSIDE, CA 92049-0002
PO BOX 3, OCEANSIDE, CA 92049-0003
PO BOX 4, OCEANSIDE, CA 92049-0004
PO BOX 5, OCEANSIDE, CA 92049-0005
PO BOX 6, OCEANSIDE, CA 92049-0006
PO BOX 7, OCEANSIDE, CA 92049-0007
PO BOX 8, OCEANSIDE, CA 92049-0008
PO BOX 9, OCEANSIDE, CA 92049-0009
PO BOX 10, OCEANSIDE, CA 92049-0010
PO BOX 11, OCEANSIDE, CA 92049-0011
PO BOX 12, OCEANSIDE, CA 92049-0012
PO BOX 13, OCEANSIDE, CA 92049-0013
PO BOX 14, OCEANSIDE, CA 92049-0014
PO BOX 15, OCEANSIDE, CA 92049-0015
PO BOX 16, OCEANSIDE, CA 92049-0016
PO BOX 17, OCEANSIDE, CA 92049-0017
PO BOX 18, OCEANSIDE, CA 92049-0018
PO BOX 19, OCEANSIDE, CA 92049-0019
PO BOX 20, OCEANSIDE, CA 92049-0020
PO BOX 21, OCEANSIDE, CA 92049-0021
PO BOX 22, OCEANSIDE, CA 92049-0022
PO BOX 23, OCEANSIDE, CA 92049-0023
PO BOX 24, OCEANSIDE, CA 92049-0024
PO BOX 25, OCEANSIDE, CA 92049-0025
PO BOX 26, OCEANSIDE, CA 92049-0026
PO BOX 27, OCEANSIDE, CA 92049-0027
PO BOX 28, OCEANSIDE, CA 92049-0028
PO BOX 29, OCEANSIDE, CA 92049-0029
PO BOX 30, OCEANSIDE, CA 92049-0030
PO BOX 31, OCEANSIDE, CA 92049-0031
PO BOX 32, OCEANSIDE, CA 92049-0032
PO BOX 33, OCEANSIDE, CA 92049-0033
PO BOX 34, OCEANSIDE, CA 92049-0034
PO BOX 35, OCEANSIDE, CA 92049-0035
PO BOX 36, OCEANSIDE, CA 92049-0036
PO BOX 37, OCEANSIDE, CA 92049-0037
PO BOX 38, OCEANSIDE, CA 92049-0038
PO BOX 39, OCEANSIDE, CA 92049-0039
PO BOX 40, OCEANSIDE, CA 92049-0040
PO BOX 41, OCEANSIDE, CA 92049-0041
PO BOX 42, OCEANSIDE, CA 92049-0042
PO BOX 43, OCEANSIDE, CA 92049-0043
PO BOX 44, OCEANSIDE, CA 92049-0044
PO BOX 45, OCEANSIDE, CA 92049-0045
PO BOX 46, OCEANSIDE, CA 92049-0046
PO BOX 47, OCEANSIDE, CA 92049-0047
PO BOX 48, OCEANSIDE, CA 92049-0048
PO BOX 49, OCEANSIDE, CA 92049-0049
PO BOX 50, OCEANSIDE, CA 92049-0050
PO BOX 51, OCEANSIDE, CA 92049-0051
PO BOX 52, OCEANSIDE, CA 92049-0052
PO BOX 53, OCEANSIDE, CA 92049-0053
PO BOX 54, OCEANSIDE, CA 92049-0054
PO BOX 55, OCEANSIDE, CA 92049-0055
PO BOX 56, OCEANSIDE, CA 92049-0056
PO BOX 57, OCEANSIDE, CA 92049-0057
PO BOX 58, OCEANSIDE, CA 92049-0058
PO BOX 59, OCEANSIDE, CA 92049-0059
PO BOX 60, OCEANSIDE, CA 92049-0060
PO BOX 61, OCEANSIDE, CA 92049-0061
PO BOX 62, OCEANSIDE, CA 92049-0062
PO BOX 63, OCEANSIDE, CA 92049-0063
PO BOX 64, OCEANSIDE, CA 92049-0064
PO BOX 65, OCEANSIDE, CA 92049-0065
PO BOX 66, OCEANSIDE, CA 92049-0066
PO BOX 67, OCEANSIDE, CA 92049-0067
PO BOX 68, OCEANSIDE, CA 92049-0068
PO BOX 69, OCEANSIDE, CA 92049-0069
PO BOX 70, OCEANSIDE, CA 92049-0070
PO BOX 71, OCEANSIDE, CA 92049-0071
PO BOX 72, OCEANSIDE, CA 92049-0072
PO BOX 73, OCEANSIDE, CA 92049-0073
PO BOX 74, OCEANSIDE, CA 92049-0074
PO BOX 75, OCEANSIDE, CA 92049-0075
PO BOX 76, OCEANSIDE, CA 92049-0076
PO BOX 77, OCEANSIDE, CA 92049-0077
PO BOX 78, OCEANSIDE, CA 92049-0078
PO BOX 79, OCEANSIDE, CA 92049-0079
PO BOX 80, OCEANSIDE, CA 92049-0080
PO BOX 81, OCEANSIDE, CA 92049-0081
PO BOX 82, OCEANSIDE, CA 92049-0082
PO BOX 83, OCEANSIDE, CA 92049-0083
PO BOX 84, OCEANSIDE, CA 92049-0084
PO BOX 85, OCEANSIDE, CA 92049-0085
PO BOX 86, OCEANSIDE, CA 92049-0086
PO BOX 87, OCEANSIDE, CA 92049-0087
PO BOX 88, OCEANSIDE, CA 92049-0088
PO BOX 89, OCEANSIDE, CA 92049-0089
PO BOX 90, OCEANSIDE, CA 92049-0090
PO BOX 91, OCEANSIDE, CA 92049-0091
PO BOX 92, OCEANSIDE, CA 92049-0092
PO BOX 93, OCEANSIDE, CA 92049-0093
PO BOX 94, OCEANSIDE, CA 92049-0094
PO BOX 95, OCEANSIDE, CA 92049-0095
PO BOX 96, OCEANSIDE, CA 92049-0096
PO BOX 97, OCEANSIDE, CA 92049-0097
PO BOX 98, OCEANSIDE, CA 92049-0098
PO BOX 99, OCEANSIDE, CA 92049-0099
PO BOX 100, OCEANSIDE, CA 92049-0100
PO BOX 101, OCEANSIDE, CA 92049-0101
PO BOX 102, OCEANSIDE, CA 92049-0102
PO BOX 103, OCEANSIDE, CA 92049-0103
PO BOX 104, OCEANSIDE, CA 92049-0104
PO BOX 105, OCEANSIDE, CA 92049-0105
PO BOX 106, OCEANSIDE, CA 92049-0106
PO BOX 107, OCEANSIDE, CA 92049-0107
PO BOX 108, OCEANSIDE, CA 92049-0108
PO BOX 109, OCEANSIDE, CA 92049-0109
PO BOX 110, OCEANSIDE, CA 92049-0110
PO BOX 111, OCEANSIDE, CA 92049-0111
PO BOX 112, OCEANSIDE, CA 92049-0112
PO BOX 113, OCEANSIDE, CA 92049-0113
PO BOX 114, OCEANSIDE, CA 92049-0114
PO BOX 115, OCEANSIDE, CA 92049-0115
PO BOX 116, OCEANSIDE, CA 92049-0116
PO BOX 117, OCEANSIDE, CA 92049-0117
PO BOX 118, OCEANSIDE, CA 92049-0118
PO BOX 119, OCEANSIDE, CA 92049-0119
PO BOX 120, OCEANSIDE, CA 92049-0120
PO BOX 121, OCEANSIDE, CA 92049-0121
PO BOX 122, OCEANSIDE, CA 92049-0122
PO BOX 123, OCEANSIDE, CA 92049-0123
PO BOX 124, OCEANSIDE, CA 92049-0124
PO BOX 125, OCEANSIDE, CA 92049-0125
PO BOX 126, OCEANSIDE, CA 92049-0126
PO BOX 127, OCEANSIDE, CA 92049-0127
PO BOX 128, OCEANSIDE, CA 92049-0128
PO BOX 129, OCEANSIDE, CA 92049-0129
PO BOX 130, OCEANSIDE, CA 92049-0130
PO BOX 131, OCEANSIDE, CA 92049-0131
PO BOX 132, OCEANSIDE, CA 92049-0132
PO BOX 133, OCEANSIDE, CA 92049-0133
PO BOX 134, OCEANSIDE, CA 92049-0134
PO BOX 135, OCEANSIDE, CA 92049-0135
PO BOX 136, OCEANSIDE, CA 92049-0136
PO BOX 137, OCEANSIDE, CA 92049-0137
PO BOX 138, OCEANSIDE, CA 92049-0138
PO BOX 139, OCEANSIDE, CA 92049-0139
PO BOX 140, OCEANSIDE, CA 92049-0140
PO BOX 141, OCEANSIDE, CA 92049-0141
PO BOX 142, OCEANSIDE, CA 92049-0142
PO BOX 143, OCEANSIDE, CA 92049-0143
PO BOX 144, OCEANSIDE, CA 92049-0144
PO BOX 145, OCEANSIDE, CA 92049-0145
PO BOX 146, OCEANSIDE, CA 92049-0146
PO BOX 147, OCEANSIDE, CA 92049-0147
PO BOX 148, OCEANSIDE, CA 92049-0148
PO BOX 149, OCEANSIDE, CA 92049-0149
PO BOX 150, OCEANSIDE, CA 92049-0150
PO BOX 151, OCEANSIDE, CA 92049-0151
PO BOX 152, OCEANSIDE, CA 92049-0152
PO BOX 153, OCEANSIDE, CA 92049-0153
PO BOX 154, OCEANSIDE, CA 92049-0154
PO BOX 155, OCEANSIDE, CA 92049-0155
PO BOX 156, OCEANSIDE, CA 92049-0156
PO BOX 157, OCEANSIDE, CA 92049-0157
PO BOX 158, OCEANSIDE, CA 92049-0158
PO BOX 159, OCEANSIDE, CA 92049-0159
PO BOX 160, OCEANSIDE, CA 92049-0160
PO BOX 161, OCEANSIDE, CA 92049-0161
PO BOX 162, OCEANSIDE, CA 92049-0162
PO BOX 163, OCEANSIDE, CA 92049-0163
PO BOX 164, OCEANSIDE, CA 92049-0164
PO BOX 165, OCEANSIDE, CA 92049-0165
PO BOX 166, OCEANSIDE, CA 92049-0166
PO BOX 167, OCEANSIDE, CA 92049-0167
PO BOX 168, OCEANSIDE, CA 92049-0168
PO BOX 169, OCEANSIDE, CA 92049-0169
PO BOX 170, OCEANSIDE, CA 92049-0170
PO BOX 171, OCEANSIDE, CA 92049-0171
PO BOX 172, OCEANSIDE, CA 92049-0172
PO BOX 173, OCEANSIDE, CA 92049-0173
PO BOX 174, OCEANSIDE, CA 92049-0174
PO BOX 175, OCEANSIDE, CA 92049-0175
PO BOX 176, OCEANSIDE, CA 92049-0176
PO BOX 177, OCEANSIDE, CA 92049-0177
PO BOX 178, OCEANSIDE, CA 92049-0178
PO BOX 179, OCEANSIDE, CA 92049-0179
PO BOX 180, OCEANSIDE, CA 92049-0180
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