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 21, BORREGO SPRINGS, CA 92004-0021
PO BOX 22, BORREGO SPRINGS, CA 92004-0022
PO BOX 23, BORREGO SPRINGS, CA 92004-0023
PO BOX 24, BORREGO SPRINGS, CA 92004-0024
PO BOX 25, BORREGO SPRINGS, CA 92004-0025
PO BOX 26, BORREGO SPRINGS, CA 92004-0026
PO BOX 27, BORREGO SPRINGS, CA 92004-0027
PO BOX 28, BORREGO SPRINGS, CA 92004-0028
PO BOX 29, BORREGO SPRINGS, CA 92004-0029
PO BOX 30, BORREGO SPRINGS, CA 92004-0030
PO BOX 31, BORREGO SPRINGS, CA 92004-0031
PO BOX 32, BORREGO SPRINGS, CA 92004-0032
PO BOX 33, BORREGO SPRINGS, CA 92004-0033
PO BOX 34, BORREGO SPRINGS, CA 92004-0034
PO BOX 35, BORREGO SPRINGS, CA 92004-0035
PO BOX 36, BORREGO SPRINGS, CA 92004-0036
PO BOX 37, BORREGO SPRINGS, CA 92004-0037
PO BOX 38, BORREGO SPRINGS, CA 92004-0038
PO BOX 39, BORREGO SPRINGS, CA 92004-0039
PO BOX 40, BORREGO SPRINGS, CA 92004-0040
PO BOX 41, BORREGO SPRINGS, CA 92004-0041
PO BOX 42, BORREGO SPRINGS, CA 92004-0042
PO BOX 43, BORREGO SPRINGS, CA 92004-0043
PO BOX 44, BORREGO SPRINGS, CA 92004-0044
PO BOX 45, BORREGO SPRINGS, CA 92004-0045
PO BOX 46, BORREGO SPRINGS, CA 92004-0046
PO BOX 47, BORREGO SPRINGS, CA 92004-0047
PO BOX 48, BORREGO SPRINGS, CA 92004-0048
PO BOX 49, BORREGO SPRINGS, CA 92004-0049
PO BOX 50, BORREGO SPRINGS, CA 92004-0050
PO BOX 51, BORREGO SPRINGS, CA 92004-0051
PO BOX 52, BORREGO SPRINGS, CA 92004-0052
PO BOX 53, BORREGO SPRINGS, CA 92004-0053
PO BOX 54, BORREGO SPRINGS, CA 92004-0054
PO BOX 55, BORREGO SPRINGS, CA 92004-0055
PO BOX 56, BORREGO SPRINGS, CA 92004-0056
PO BOX 57, BORREGO SPRINGS, CA 92004-0057
PO BOX 58, BORREGO SPRINGS, CA 92004-0058
PO BOX 59, BORREGO SPRINGS, CA 92004-0059
PO BOX 60, BORREGO SPRINGS, CA 92004-0060
PO BOX 61, BORREGO SPRINGS, CA 92004-0061
PO BOX 62, BORREGO SPRINGS, CA 92004-0062
PO BOX 63, BORREGO SPRINGS, CA 92004-0063
PO BOX 64, BORREGO SPRINGS, CA 92004-0064
PO BOX 65, BORREGO SPRINGS, CA 92004-0065
PO BOX 66, BORREGO SPRINGS, CA 92004-0066
PO BOX 67, BORREGO SPRINGS, CA 92004-0067
PO BOX 68, BORREGO SPRINGS, CA 92004-0068
PO BOX 69, BORREGO SPRINGS, CA 92004-0069
PO BOX 70, BORREGO SPRINGS, CA 92004-0070
PO BOX 71, BORREGO SPRINGS, CA 92004-0071
PO BOX 72, BORREGO SPRINGS, CA 92004-0072
PO BOX 73, BORREGO SPRINGS, CA 92004-0073
PO BOX 74, BORREGO SPRINGS, CA 92004-0074
PO BOX 75, BORREGO SPRINGS, CA 92004-0075
PO BOX 76, BORREGO SPRINGS, CA 92004-0076
PO BOX 77, BORREGO SPRINGS, CA 92004-0077
PO BOX 78, BORREGO SPRINGS, CA 92004-0078
PO BOX 79, BORREGO SPRINGS, CA 92004-0079
PO BOX 80, BORREGO SPRINGS, CA 92004-0080
PO BOX 81, BORREGO SPRINGS, CA 92004-0081
PO BOX 82, BORREGO SPRINGS, CA 92004-0082
PO BOX 83, BORREGO SPRINGS, CA 92004-0083
PO BOX 84, BORREGO SPRINGS, CA 92004-0084
PO BOX 85, BORREGO SPRINGS, CA 92004-0085
PO BOX 86, BORREGO SPRINGS, CA 92004-0086
PO BOX 87, BORREGO SPRINGS, CA 92004-0087
PO BOX 88, BORREGO SPRINGS, CA 92004-0088
PO BOX 89, BORREGO SPRINGS, CA 92004-0089
PO BOX 90, BORREGO SPRINGS, CA 92004-0090
PO BOX 91, BORREGO SPRINGS, CA 92004-0091
PO BOX 92, BORREGO SPRINGS, CA 92004-0092
PO BOX 93, BORREGO SPRINGS, CA 92004-0093
PO BOX 94, BORREGO SPRINGS, CA 92004-0094
PO BOX 95, BORREGO SPRINGS, CA 92004-0095
PO BOX 96, BORREGO SPRINGS, CA 92004-0096
PO BOX 97, BORREGO SPRINGS, CA 92004-0097
PO BOX 98, BORREGO SPRINGS, CA 92004-0098
PO BOX 99, BORREGO SPRINGS, CA 92004-0099
PO BOX 100, BORREGO SPRINGS, CA 92004-0100
PO BOX 101, BORREGO SPRINGS, CA 92004-0101
PO BOX 102, BORREGO SPRINGS, CA 92004-0102
PO BOX 103, BORREGO SPRINGS, CA 92004-0103
PO BOX 104, BORREGO SPRINGS, CA 92004-0104
PO BOX 105, BORREGO SPRINGS, CA 92004-0105
PO BOX 106, BORREGO SPRINGS, CA 92004-0106
PO BOX 107, BORREGO SPRINGS, CA 92004-0107
PO BOX 108, BORREGO SPRINGS, CA 92004-0108
PO BOX 109, BORREGO SPRINGS, CA 92004-0109
PO BOX 110, BORREGO SPRINGS, CA 92004-0110
PO BOX 111, BORREGO SPRINGS, CA 92004-0111
PO BOX 112, BORREGO SPRINGS, CA 92004-0112
PO BOX 113, BORREGO SPRINGS, CA 92004-0113
PO BOX 114, BORREGO SPRINGS, CA 92004-0114
PO BOX 115, BORREGO SPRINGS, CA 92004-0115
PO BOX 116, BORREGO SPRINGS, CA 92004-0116
PO BOX 117, BORREGO SPRINGS, CA 92004-0117
PO BOX 118, BORREGO SPRINGS, CA 92004-0118
PO BOX 119, BORREGO SPRINGS, CA 92004-0119
PO BOX 120, BORREGO SPRINGS, CA 92004-0120
PO BOX 121, BORREGO SPRINGS, CA 92004-0121
PO BOX 122, BORREGO SPRINGS, CA 92004-0122
PO BOX 123, BORREGO SPRINGS, CA 92004-0123
PO BOX 124, BORREGO SPRINGS, CA 92004-0124
PO BOX 125, BORREGO SPRINGS, CA 92004-0125
PO BOX 126, BORREGO SPRINGS, CA 92004-0126
PO BOX 127, BORREGO SPRINGS, CA 92004-0127
PO BOX 128, BORREGO SPRINGS, CA 92004-0128
PO BOX 129, BORREGO SPRINGS, CA 92004-0129
PO BOX 130, BORREGO SPRINGS, CA 92004-0130
PO BOX 131, BORREGO SPRINGS, CA 92004-0131
PO BOX 132, BORREGO SPRINGS, CA 92004-0132
PO BOX 133, BORREGO SPRINGS, CA 92004-0133
PO BOX 134, BORREGO SPRINGS, CA 92004-0134
PO BOX 135, BORREGO SPRINGS, CA 92004-0135
PO BOX 136, BORREGO SPRINGS, CA 92004-0136
PO BOX 137, BORREGO SPRINGS, CA 92004-0137
PO BOX 138, BORREGO SPRINGS, CA 92004-0138
PO BOX 139, BORREGO SPRINGS, CA 92004-0139
PO BOX 140, BORREGO SPRINGS, CA 92004-0140
PO BOX 141, BORREGO SPRINGS, CA 92004-0141
PO BOX 142, BORREGO SPRINGS, CA 92004-0142
PO BOX 143, BORREGO SPRINGS, CA 92004-0143
PO BOX 144, BORREGO SPRINGS, CA 92004-0144
PO BOX 145, BORREGO SPRINGS, CA 92004-0145
PO BOX 146, BORREGO SPRINGS, CA 92004-0146
PO BOX 147, BORREGO SPRINGS, CA 92004-0147
PO BOX 148, BORREGO SPRINGS, CA 92004-0148
PO BOX 149, BORREGO SPRINGS, CA 92004-0149
PO BOX 150, BORREGO SPRINGS, CA 92004-0150
PO BOX 151, BORREGO SPRINGS, CA 92004-0151
PO BOX 152, BORREGO SPRINGS, CA 92004-0152
PO BOX 153, BORREGO SPRINGS, CA 92004-0153
PO BOX 154, BORREGO SPRINGS, CA 92004-0154
PO BOX 155, BORREGO SPRINGS, CA 92004-0155
PO BOX 156, BORREGO SPRINGS, CA 92004-0156
PO BOX 157, BORREGO SPRINGS, CA 92004-0157
PO BOX 158, BORREGO SPRINGS, CA 92004-0158
PO BOX 159, BORREGO SPRINGS, CA 92004-0159
PO BOX 160, BORREGO SPRINGS, CA 92004-0160
PO BOX 161, BORREGO SPRINGS, CA 92004-0161
PO BOX 162, BORREGO SPRINGS, CA 92004-0162
PO BOX 163, BORREGO SPRINGS, CA 92004-0163
PO BOX 164, BORREGO SPRINGS, CA 92004-0164
PO BOX 165, BORREGO SPRINGS, CA 92004-0165
PO BOX 166, BORREGO SPRINGS, CA 92004-0166
PO BOX 167, BORREGO SPRINGS, CA 92004-0167
PO BOX 168, BORREGO SPRINGS, CA 92004-0168
PO BOX 169, BORREGO SPRINGS, CA 92004-0169
PO BOX 170, BORREGO SPRINGS, CA 92004-0170
PO BOX 171, BORREGO SPRINGS, CA 92004-0171
PO BOX 172, BORREGO SPRINGS, CA 92004-0172
PO BOX 173, BORREGO SPRINGS, CA 92004-0173
PO BOX 174, BORREGO SPRINGS, CA 92004-0174
PO BOX 175, BORREGO SPRINGS, CA 92004-0175
PO BOX 176, BORREGO SPRINGS, CA 92004-0176
PO BOX 177, BORREGO SPRINGS, CA 92004-0177
PO BOX 178, BORREGO SPRINGS, CA 92004-0178
PO BOX 179, BORREGO SPRINGS, CA 92004-0179
PO BOX 180, BORREGO SPRINGS, CA 92004-0180
PO BOX 181, BORREGO SPRINGS, CA 92004-0181
PO BOX 182, BORREGO SPRINGS, CA 92004-0182
PO BOX 183, BORREGO SPRINGS, CA 92004-0183
PO BOX 184, BORREGO SPRINGS, CA 92004-0184
PO BOX 185, BORREGO SPRINGS, CA 92004-0185
PO BOX 186, BORREGO SPRINGS, CA 92004-0186
PO BOX 187, BORREGO SPRINGS, CA 92004-0187
PO BOX 188, BORREGO SPRINGS, CA 92004-0188
PO BOX 189, BORREGO SPRINGS, CA 92004-0189
PO BOX 190, BORREGO SPRINGS, CA 92004-0190
PO BOX 191, BORREGO SPRINGS, CA 92004-0191
PO BOX 192, BORREGO SPRINGS, CA 92004-0192
PO BOX 193, BORREGO SPRINGS, CA 92004-0193
PO BOX 194, BORREGO SPRINGS, CA 92004-0194
PO BOX 195, BORREGO SPRINGS, CA 92004-0195
PO BOX 196, BORREGO SPRINGS, CA 92004-0196
PO BOX 197, BORREGO SPRINGS, CA 92004-0197
PO BOX 198, BORREGO SPRINGS, CA 92004-0198
PO BOX 199, BORREGO SPRINGS, CA 92004-0199
PO BOX 200, BORREGO SPRINGS, CA 92004-0200
PO BOX 201, BORREGO SPRINGS, CA 92004-0201
PO BOX 202, BORREGO SPRINGS, CA 92004-0202
PO BOX 203, BORREGO SPRINGS, CA 92004-0203
PO BOX 204, BORREGO SPRINGS, CA 92004-0204
PO BOX 205, BORREGO SPRINGS, CA 92004-0205
PO BOX 206, BORREGO SPRINGS, CA 92004-0206
PO BOX 207, BORREGO SPRINGS, CA 92004-0207
PO BOX 208, BORREGO SPRINGS, CA 92004-0208
PO BOX 209, BORREGO SPRINGS, CA 92004-0209
PO BOX 210, BORREGO SPRINGS, CA 92004-0210
PO BOX 211, BORREGO SPRINGS, CA 92004-0211
PO BOX 212, BORREGO SPRINGS, CA 92004-0212
PO BOX 213, BORREGO SPRINGS, CA 92004-0213
PO BOX 214, BORREGO SPRINGS, CA 92004-0214
PO BOX 215, BORREGO SPRINGS, CA 92004-0215
PO BOX 216, BORREGO SPRINGS, CA 92004-0216
PO BOX 217, BORREGO SPRINGS, CA 92004-0217
PO BOX 218, BORREGO SPRINGS, CA 92004-0218
PO BOX 219, BORREGO SPRINGS, CA 92004-0219
PO BOX 220, BORREGO SPRINGS, CA 92004-0220
PO BOX 221, BORREGO SPRINGS, CA 92004-0221
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