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 121, CATHEDRAL CITY, CA 92235-0121
PO BOX 122, CATHEDRAL CITY, CA 92235-0122
PO BOX 123, CATHEDRAL CITY, CA 92235-0123
PO BOX 124, CATHEDRAL CITY, CA 92235-0124
PO BOX 125, CATHEDRAL CITY, CA 92235-0125
PO BOX 126, CATHEDRAL CITY, CA 92235-0126
PO BOX 127, CATHEDRAL CITY, CA 92235-0127
PO BOX 128, CATHEDRAL CITY, CA 92235-0128
PO BOX 129, CATHEDRAL CITY, CA 92235-0129
PO BOX 130, CATHEDRAL CITY, CA 92235-0130
PO BOX 131, CATHEDRAL CITY, CA 92235-0131
PO BOX 132, CATHEDRAL CITY, CA 92235-0132
PO BOX 133, CATHEDRAL CITY, CA 92235-0133
PO BOX 134, CATHEDRAL CITY, CA 92235-0134
PO BOX 135, CATHEDRAL CITY, CA 92235-0135
PO BOX 136, CATHEDRAL CITY, CA 92235-0136
PO BOX 137, CATHEDRAL CITY, CA 92235-0137
PO BOX 138, CATHEDRAL CITY, CA 92235-0138
PO BOX 139, CATHEDRAL CITY, CA 92235-0139
PO BOX 140, CATHEDRAL CITY, CA 92235-0140
PO BOX 141, CATHEDRAL CITY, CA 92235-0141
PO BOX 142, CATHEDRAL CITY, CA 92235-0142
PO BOX 143, CATHEDRAL CITY, CA 92235-0143
PO BOX 144, CATHEDRAL CITY, CA 92235-0144
PO BOX 145, CATHEDRAL CITY, CA 92235-0145
PO BOX 146, CATHEDRAL CITY, CA 92235-0146
PO BOX 147, CATHEDRAL CITY, CA 92235-0147
PO BOX 148, CATHEDRAL CITY, CA 92235-0148
PO BOX 149, CATHEDRAL CITY, CA 92235-0149
PO BOX 150, CATHEDRAL CITY, CA 92235-0150
PO BOX 151, CATHEDRAL CITY, CA 92235-0151
PO BOX 152, CATHEDRAL CITY, CA 92235-0152
PO BOX 153, CATHEDRAL CITY, CA 92235-0153
PO BOX 154, CATHEDRAL CITY, CA 92235-0154
PO BOX 155, CATHEDRAL CITY, CA 92235-0155
PO BOX 156, CATHEDRAL CITY, CA 92235-0156
PO BOX 157, CATHEDRAL CITY, CA 92235-0157
PO BOX 158, CATHEDRAL CITY, CA 92235-0158
PO BOX 159, CATHEDRAL CITY, CA 92235-0159
PO BOX 160, CATHEDRAL CITY, CA 92235-0160
PO BOX 161, CATHEDRAL CITY, CA 92235-0161
PO BOX 162, CATHEDRAL CITY, CA 92235-0162
PO BOX 163, CATHEDRAL CITY, CA 92235-0163
PO BOX 164, CATHEDRAL CITY, CA 92235-0164
PO BOX 165, CATHEDRAL CITY, CA 92235-0165
PO BOX 166, CATHEDRAL CITY, CA 92235-0166
PO BOX 167, CATHEDRAL CITY, CA 92235-0167
PO BOX 168, CATHEDRAL CITY, CA 92235-0168
PO BOX 169, CATHEDRAL CITY, CA 92235-0169
PO BOX 170, CATHEDRAL CITY, CA 92235-0170
PO BOX 171, CATHEDRAL CITY, CA 92235-0171
PO BOX 172, CATHEDRAL CITY, CA 92235-0172
PO BOX 173, CATHEDRAL CITY, CA 92235-0173
PO BOX 174, CATHEDRAL CITY, CA 92235-0174
PO BOX 175, CATHEDRAL CITY, CA 92235-0175
PO BOX 176, CATHEDRAL CITY, CA 92235-0176
PO BOX 177, CATHEDRAL CITY, CA 92235-0177
PO BOX 178, CATHEDRAL CITY, CA 92235-0178
PO BOX 179, CATHEDRAL CITY, CA 92235-0179
PO BOX 180, CATHEDRAL CITY, CA 92235-0180
PO BOX 181, CATHEDRAL CITY, CA 92235-0181
PO BOX 182, CATHEDRAL CITY, CA 92235-0182
PO BOX 183, CATHEDRAL CITY, CA 92235-0183
PO BOX 184, CATHEDRAL CITY, CA 92235-0184
PO BOX 185, CATHEDRAL CITY, CA 92235-0185
PO BOX 186, CATHEDRAL CITY, CA 92235-0186
PO BOX 187, CATHEDRAL CITY, CA 92235-0187
PO BOX 188, CATHEDRAL CITY, CA 92235-0188
PO BOX 189, CATHEDRAL CITY, CA 92235-0189
PO BOX 190, CATHEDRAL CITY, CA 92235-0190
PO BOX 191, CATHEDRAL CITY, CA 92235-0191
PO BOX 192, CATHEDRAL CITY, CA 92235-0192
PO BOX 193, CATHEDRAL CITY, CA 92235-0193
PO BOX 194, CATHEDRAL CITY, CA 92235-0194
PO BOX 195, CATHEDRAL CITY, CA 92235-0195
PO BOX 196, CATHEDRAL CITY, CA 92235-0196
PO BOX 197, CATHEDRAL CITY, CA 92235-0197
PO BOX 198, CATHEDRAL CITY, CA 92235-0198
PO BOX 199, CATHEDRAL CITY, CA 92235-0199
PO BOX 200, CATHEDRAL CITY, CA 92235-0200
PO BOX 201, CATHEDRAL CITY, CA 92235-0201
PO BOX 202, CATHEDRAL CITY, CA 92235-0202
PO BOX 203, CATHEDRAL CITY, CA 92235-0203
PO BOX 204, CATHEDRAL CITY, CA 92235-0204
PO BOX 205, CATHEDRAL CITY, CA 92235-0205
PO BOX 206, CATHEDRAL CITY, CA 92235-0206
PO BOX 207, CATHEDRAL CITY, CA 92235-0207
PO BOX 208, CATHEDRAL CITY, CA 92235-0208
PO BOX 209, CATHEDRAL CITY, CA 92235-0209
PO BOX 210, CATHEDRAL CITY, CA 92235-0210
PO BOX 211, CATHEDRAL CITY, CA 92235-0211
PO BOX 212, CATHEDRAL CITY, CA 92235-0212
PO BOX 213, CATHEDRAL CITY, CA 92235-0213
PO BOX 214, CATHEDRAL CITY, CA 92235-0214
PO BOX 215, CATHEDRAL CITY, CA 92235-0215
PO BOX 216, CATHEDRAL CITY, CA 92235-0216
PO BOX 217, CATHEDRAL CITY, CA 92235-0217
PO BOX 218, CATHEDRAL CITY, CA 92235-0218
PO BOX 219, CATHEDRAL CITY, CA 92235-0219
PO BOX 220, CATHEDRAL CITY, CA 92235-0220
PO BOX 221, CATHEDRAL CITY, CA 92235-0221
PO BOX 222, CATHEDRAL CITY, CA 92235-0222
PO BOX 223, CATHEDRAL CITY, CA 92235-0223
PO BOX 224, CATHEDRAL CITY, CA 92235-0224
PO BOX 225, CATHEDRAL CITY, CA 92235-0225
PO BOX 226, CATHEDRAL CITY, CA 92235-0226
PO BOX 227, CATHEDRAL CITY, CA 92235-0227
PO BOX 228, CATHEDRAL CITY, CA 92235-0228
PO BOX 229, CATHEDRAL CITY, CA 92235-0229
PO BOX 230, CATHEDRAL CITY, CA 92235-0230
PO BOX 231, CATHEDRAL CITY, CA 92235-0231
PO BOX 232, CATHEDRAL CITY, CA 92235-0232
PO BOX 233, CATHEDRAL CITY, CA 92235-0233
PO BOX 234, CATHEDRAL CITY, CA 92235-0234
PO BOX 235, CATHEDRAL CITY, CA 92235-0235
PO BOX 236, CATHEDRAL CITY, CA 92235-0236
PO BOX 237, CATHEDRAL CITY, CA 92235-0237
PO BOX 238, CATHEDRAL CITY, CA 92235-0238
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