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, IMPERIAL BEACH, CA 91933-0001
PO BOX 2, IMPERIAL BEACH, CA 91933-0002
PO BOX 3, IMPERIAL BEACH, CA 91933-0003
PO BOX 4, IMPERIAL BEACH, CA 91933-0004
PO BOX 5, IMPERIAL BEACH, CA 91933-0005
PO BOX 6, IMPERIAL BEACH, CA 91933-0006
PO BOX 7, IMPERIAL BEACH, CA 91933-0007
PO BOX 8, IMPERIAL BEACH, CA 91933-0008
PO BOX 9, IMPERIAL BEACH, CA 91933-0009
PO BOX 10, IMPERIAL BEACH, CA 91933-0010
PO BOX 11, IMPERIAL BEACH, CA 91933-0011
PO BOX 12, IMPERIAL BEACH, CA 91933-0012
PO BOX 13, IMPERIAL BEACH, CA 91933-0013
PO BOX 14, IMPERIAL BEACH, CA 91933-0014
PO BOX 15, IMPERIAL BEACH, CA 91933-0015
PO BOX 16, IMPERIAL BEACH, CA 91933-0016
PO BOX 17, IMPERIAL BEACH, CA 91933-0017
PO BOX 18, IMPERIAL BEACH, CA 91933-0018
PO BOX 19, IMPERIAL BEACH, CA 91933-0019
PO BOX 20, IMPERIAL BEACH, CA 91933-0020
PO BOX 21, IMPERIAL BEACH, CA 91933-0021
PO BOX 22, IMPERIAL BEACH, CA 91933-0022
PO BOX 23, IMPERIAL BEACH, CA 91933-0023
PO BOX 24, IMPERIAL BEACH, CA 91933-0024
PO BOX 25, IMPERIAL BEACH, CA 91933-0025
PO BOX 26, IMPERIAL BEACH, CA 91933-0026
PO BOX 27, IMPERIAL BEACH, CA 91933-0027
PO BOX 28, IMPERIAL BEACH, CA 91933-0028
PO BOX 29, IMPERIAL BEACH, CA 91933-0029
PO BOX 30, IMPERIAL BEACH, CA 91933-0030
PO BOX 31, IMPERIAL BEACH, CA 91933-0031
PO BOX 32, IMPERIAL BEACH, CA 91933-0032
PO BOX 33, IMPERIAL BEACH, CA 91933-0033
PO BOX 34, IMPERIAL BEACH, CA 91933-0034
PO BOX 35, IMPERIAL BEACH, CA 91933-0035
PO BOX 36, IMPERIAL BEACH, CA 91933-0036
PO BOX 37, IMPERIAL BEACH, CA 91933-0037
PO BOX 38, IMPERIAL BEACH, CA 91933-0038
PO BOX 39, IMPERIAL BEACH, CA 91933-0039
PO BOX 40, IMPERIAL BEACH, CA 91933-0040
PO BOX 41, IMPERIAL BEACH, CA 91933-0041
PO BOX 42, IMPERIAL BEACH, CA 91933-0042
PO BOX 43, IMPERIAL BEACH, CA 91933-0043
PO BOX 44, IMPERIAL BEACH, CA 91933-0044
PO BOX 45, IMPERIAL BEACH, CA 91933-0045
PO BOX 46, IMPERIAL BEACH, CA 91933-0046
PO BOX 47, IMPERIAL BEACH, CA 91933-0047
PO BOX 48, IMPERIAL BEACH, CA 91933-0048
PO BOX 49, IMPERIAL BEACH, CA 91933-0049
PO BOX 50, IMPERIAL BEACH, CA 91933-0050
PO BOX 51, IMPERIAL BEACH, CA 91933-0051
PO BOX 52, IMPERIAL BEACH, CA 91933-0052
PO BOX 53, IMPERIAL BEACH, CA 91933-0053
PO BOX 54, IMPERIAL BEACH, CA 91933-0054
PO BOX 55, IMPERIAL BEACH, CA 91933-0055
PO BOX 56, IMPERIAL BEACH, CA 91933-0056
PO BOX 57, IMPERIAL BEACH, CA 91933-0057
PO BOX 58, IMPERIAL BEACH, CA 91933-0058
PO BOX 59, IMPERIAL BEACH, CA 91933-0059
PO BOX 60, IMPERIAL BEACH, CA 91933-0060
PO BOX 61, IMPERIAL BEACH, CA 91933-0061
PO BOX 62, IMPERIAL BEACH, CA 91933-0062
PO BOX 63, IMPERIAL BEACH, CA 91933-0063
PO BOX 64, IMPERIAL BEACH, CA 91933-0064
PO BOX 65, IMPERIAL BEACH, CA 91933-0065
PO BOX 66, IMPERIAL BEACH, CA 91933-0066
PO BOX 67, IMPERIAL BEACH, CA 91933-0067
PO BOX 68, IMPERIAL BEACH, CA 91933-0068
PO BOX 69, IMPERIAL BEACH, CA 91933-0069
PO BOX 70, IMPERIAL BEACH, CA 91933-0070
PO BOX 71, IMPERIAL BEACH, CA 91933-0071
PO BOX 72, IMPERIAL BEACH, CA 91933-0072
PO BOX 73, IMPERIAL BEACH, CA 91933-0073
PO BOX 74, IMPERIAL BEACH, CA 91933-0074
PO BOX 75, IMPERIAL BEACH, CA 91933-0075
PO BOX 76, IMPERIAL BEACH, CA 91933-0076
PO BOX 77, IMPERIAL BEACH, CA 91933-0077
PO BOX 78, IMPERIAL BEACH, CA 91933-0078
PO BOX 79, IMPERIAL BEACH, CA 91933-0079
PO BOX 80, IMPERIAL BEACH, CA 91933-0080
PO BOX 81, IMPERIAL BEACH, CA 91933-0081
PO BOX 82, IMPERIAL BEACH, CA 91933-0082
PO BOX 83, IMPERIAL BEACH, CA 91933-0083
PO BOX 84, IMPERIAL BEACH, CA 91933-0084
PO BOX 85, IMPERIAL BEACH, CA 91933-0085
PO BOX 86, IMPERIAL BEACH, CA 91933-0086
PO BOX 87, IMPERIAL BEACH, CA 91933-0087
PO BOX 88, IMPERIAL BEACH, CA 91933-0088
PO BOX 89, IMPERIAL BEACH, CA 91933-0089
PO BOX 90, IMPERIAL BEACH, CA 91933-0090
PO BOX 91, IMPERIAL BEACH, CA 91933-0091
PO BOX 92, IMPERIAL BEACH, CA 91933-0092
PO BOX 93, IMPERIAL BEACH, CA 91933-0093
PO BOX 94, IMPERIAL BEACH, CA 91933-0094
PO BOX 95, IMPERIAL BEACH, CA 91933-0095
PO BOX 96, IMPERIAL BEACH, CA 91933-0096
PO BOX 97, IMPERIAL BEACH, CA 91933-0097
PO BOX 98, IMPERIAL BEACH, CA 91933-0098
PO BOX 99, IMPERIAL BEACH, CA 91933-0099
PO BOX 100, IMPERIAL BEACH, CA 91933-0100
PO BOX 101, IMPERIAL BEACH, CA 91933-0101
PO BOX 102, IMPERIAL BEACH, CA 91933-0102
PO BOX 103, IMPERIAL BEACH, CA 91933-0103
PO BOX 104, IMPERIAL BEACH, CA 91933-0104
PO BOX 105, IMPERIAL BEACH, CA 91933-0105
PO BOX 106, IMPERIAL BEACH, CA 91933-0106
PO BOX 107, IMPERIAL BEACH, CA 91933-0107
PO BOX 108, IMPERIAL BEACH, CA 91933-0108
PO BOX 109, IMPERIAL BEACH, CA 91933-0109
PO BOX 110, IMPERIAL BEACH, CA 91933-0110
PO BOX 111, IMPERIAL BEACH, CA 91933-0111
PO BOX 112, IMPERIAL BEACH, CA 91933-0112
PO BOX 113, IMPERIAL BEACH, CA 91933-0113
PO BOX 114, IMPERIAL BEACH, CA 91933-0114
PO BOX 115, IMPERIAL BEACH, CA 91933-0115
PO BOX 116, IMPERIAL BEACH, CA 91933-0116
PO BOX 117, IMPERIAL BEACH, CA 91933-0117
PO BOX 118, IMPERIAL BEACH, CA 91933-0118
PO BOX 119, IMPERIAL BEACH, CA 91933-0119
PO BOX 120, IMPERIAL BEACH, CA 91933-0120
PO BOX 121, IMPERIAL BEACH, CA 91933-0121
PO BOX 122, IMPERIAL BEACH, CA 91933-0122
PO BOX 123, IMPERIAL BEACH, CA 91933-0123
PO BOX 124, IMPERIAL BEACH, CA 91933-0124
PO BOX 125, IMPERIAL BEACH, CA 91933-0125
PO BOX 126, IMPERIAL BEACH, CA 91933-0126
PO BOX 127, IMPERIAL BEACH, CA 91933-0127
PO BOX 128, IMPERIAL BEACH, CA 91933-0128
PO BOX 129, IMPERIAL BEACH, CA 91933-0129
PO BOX 130, IMPERIAL BEACH, CA 91933-0130
PO BOX 131, IMPERIAL BEACH, CA 91933-0131
PO BOX 132, IMPERIAL BEACH, CA 91933-0132
PO BOX 133, IMPERIAL BEACH, CA 91933-0133
PO BOX 134, IMPERIAL BEACH, CA 91933-0134
PO BOX 135, IMPERIAL BEACH, CA 91933-0135
PO BOX 136, IMPERIAL BEACH, CA 91933-0136
PO BOX 137, IMPERIAL BEACH, CA 91933-0137
PO BOX 138, IMPERIAL BEACH, CA 91933-0138
PO BOX 139, IMPERIAL BEACH, CA 91933-0139
PO BOX 140, IMPERIAL BEACH, CA 91933-0140
PO BOX 141, IMPERIAL BEACH, CA 91933-0141
PO BOX 142, IMPERIAL BEACH, CA 91933-0142
PO BOX 143, IMPERIAL BEACH, CA 91933-0143
PO BOX 144, IMPERIAL BEACH, CA 91933-0144
PO BOX 145, IMPERIAL BEACH, CA 91933-0145
PO BOX 146, IMPERIAL BEACH, CA 91933-0146
PO BOX 147, IMPERIAL BEACH, CA 91933-0147
PO BOX 148, IMPERIAL BEACH, CA 91933-0148
PO BOX 149, IMPERIAL BEACH, CA 91933-0149
PO BOX 150, IMPERIAL BEACH, CA 91933-0150
PO BOX 151, IMPERIAL BEACH, CA 91933-0151
PO BOX 152, IMPERIAL BEACH, CA 91933-0152
PO BOX 153, IMPERIAL BEACH, CA 91933-0153
PO BOX 154, IMPERIAL BEACH, CA 91933-0154
PO BOX 155, IMPERIAL BEACH, CA 91933-0155
PO BOX 156, IMPERIAL BEACH, CA 91933-0156
PO BOX 157, IMPERIAL BEACH, CA 91933-0157
PO BOX 158, IMPERIAL BEACH, CA 91933-0158
PO BOX 159, IMPERIAL BEACH, CA 91933-0159
PO BOX 160, IMPERIAL BEACH, CA 91933-0160
PO BOX 161, IMPERIAL BEACH, CA 91933-0161
PO BOX 162, IMPERIAL BEACH, CA 91933-0162
PO BOX 163, IMPERIAL BEACH, CA 91933-0163
PO BOX 164, IMPERIAL BEACH, CA 91933-0164
PO BOX 165, IMPERIAL BEACH, CA 91933-0165
PO BOX 166, IMPERIAL BEACH, CA 91933-0166
PO BOX 167, IMPERIAL BEACH, CA 91933-0167
PO BOX 168, IMPERIAL BEACH, CA 91933-0168
PO BOX 169, IMPERIAL BEACH, CA 91933-0169
PO BOX 170, IMPERIAL BEACH, CA 91933-0170
PO BOX 171, IMPERIAL BEACH, CA 91933-0171
PO BOX 172, IMPERIAL BEACH, CA 91933-0172
PO BOX 173, IMPERIAL BEACH, CA 91933-0173
PO BOX 174, IMPERIAL BEACH, CA 91933-0174
PO BOX 175, IMPERIAL BEACH, CA 91933-0175
PO BOX 176, IMPERIAL BEACH, CA 91933-0176
PO BOX 177, IMPERIAL BEACH, CA 91933-0177
PO BOX 178, IMPERIAL BEACH, CA 91933-0178
PO BOX 179, IMPERIAL BEACH, CA 91933-0179
PO BOX 180, IMPERIAL BEACH, CA 91933-0180
PO BOX 181, IMPERIAL BEACH, CA 91933-0181
PO BOX 182, IMPERIAL BEACH, CA 91933-0182
PO BOX 183, IMPERIAL BEACH, CA 91933-0183
PO BOX 184, IMPERIAL BEACH, CA 91933-0184
PO BOX 185, IMPERIAL BEACH, CA 91933-0185
PO BOX 186, IMPERIAL BEACH, CA 91933-0186
PO BOX 187, IMPERIAL BEACH, CA 91933-0187
PO BOX 188, IMPERIAL BEACH, CA 91933-0188
PO BOX 189, IMPERIAL BEACH, CA 91933-0189
PO BOX 190, IMPERIAL BEACH, CA 91933-0190
PO BOX 191, IMPERIAL BEACH, CA 91933-0191
PO BOX 192, IMPERIAL BEACH, CA 91933-0192
PO BOX 193, IMPERIAL BEACH, CA 91933-0193
PO BOX 194, IMPERIAL BEACH, CA 91933-0194
PO BOX 195, IMPERIAL BEACH, CA 91933-0195
PO BOX 196, IMPERIAL BEACH, CA 91933-0196
PO BOX 197, IMPERIAL BEACH, CA 91933-0197
PO BOX 198, IMPERIAL BEACH, CA 91933-0198
PO BOX 199, IMPERIAL BEACH, CA 91933-0199
PO BOX 200, IMPERIAL BEACH, CA 91933-0200
PO BOX 201, IMPERIAL BEACH, CA 91933-0201
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