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 4121, OCEANSIDE, CA 92052-4121
PO BOX 4122, OCEANSIDE, CA 92052-4122
PO BOX 4123, OCEANSIDE, CA 92052-4123
PO BOX 4124, OCEANSIDE, CA 92052-4124
PO BOX 4125, OCEANSIDE, CA 92052-4125
PO BOX 4126, OCEANSIDE, CA 92052-4126
PO BOX 4127, OCEANSIDE, CA 92052-4127
PO BOX 4128, OCEANSIDE, CA 92052-4128
PO BOX 4129, OCEANSIDE, CA 92052-4129
PO BOX 4130, OCEANSIDE, CA 92052-4130
PO BOX 4131, OCEANSIDE, CA 92052-4131
PO BOX 4132, OCEANSIDE, CA 92052-4132
PO BOX 4133, OCEANSIDE, CA 92052-4133
PO BOX 4134, OCEANSIDE, CA 92052-4134
PO BOX 4135, OCEANSIDE, CA 92052-4135
PO BOX 4136, OCEANSIDE, CA 92052-4136
PO BOX 4137, OCEANSIDE, CA 92052-4137
PO BOX 4138, OCEANSIDE, CA 92052-4138
PO BOX 4139, OCEANSIDE, CA 92052-4139
PO BOX 4140, OCEANSIDE, CA 92052-4140
PO BOX 4141, OCEANSIDE, CA 92052-4141
PO BOX 4142, OCEANSIDE, CA 92052-4142
PO BOX 4143, OCEANSIDE, CA 92052-4143
PO BOX 4144, OCEANSIDE, CA 92052-4144
PO BOX 4145, OCEANSIDE, CA 92052-4145
PO BOX 4146, OCEANSIDE, CA 92052-4146
PO BOX 4147, OCEANSIDE, CA 92052-4147
PO BOX 4148, OCEANSIDE, CA 92052-4148
PO BOX 4149, OCEANSIDE, CA 92052-4149
PO BOX 4150, OCEANSIDE, CA 92052-4150
PO BOX 4151, OCEANSIDE, CA 92052-4151
PO BOX 4152, OCEANSIDE, CA 92052-4152
PO BOX 4153, OCEANSIDE, CA 92052-4153
PO BOX 4154, OCEANSIDE, CA 92052-4154
PO BOX 4155, OCEANSIDE, CA 92052-4155
PO BOX 4156, OCEANSIDE, CA 92052-4156
PO BOX 4157, OCEANSIDE, CA 92052-4157
PO BOX 4158, OCEANSIDE, CA 92052-4158
PO BOX 4159, OCEANSIDE, CA 92052-4159
PO BOX 4160, OCEANSIDE, CA 92052-4160
PO BOX 4161, OCEANSIDE, CA 92052-4161
PO BOX 4162, OCEANSIDE, CA 92052-4162
PO BOX 4163, OCEANSIDE, CA 92052-4163
PO BOX 4164, OCEANSIDE, CA 92052-4164
PO BOX 4165, OCEANSIDE, CA 92052-4165
PO BOX 4166, OCEANSIDE, CA 92052-4166
PO BOX 4167, OCEANSIDE, CA 92052-4167
PO BOX 4168, OCEANSIDE, CA 92052-4168
PO BOX 4169, OCEANSIDE, CA 92052-4169
PO BOX 4170, OCEANSIDE, CA 92052-4170
PO BOX 4171, OCEANSIDE, CA 92052-4171
PO BOX 4172, OCEANSIDE, CA 92052-4172
PO BOX 4173, OCEANSIDE, CA 92052-4173
PO BOX 4174, OCEANSIDE, CA 92052-4174
PO BOX 4175, OCEANSIDE, CA 92052-4175
PO BOX 4176, OCEANSIDE, CA 92052-4176
PO BOX 4177, OCEANSIDE, CA 92052-4177
PO BOX 4178, OCEANSIDE, CA 92052-4178
PO BOX 4179, OCEANSIDE, CA 92052-4179
PO BOX 4180, OCEANSIDE, CA 92052-4180
PO BOX 4181, OCEANSIDE, CA 92052-4181
PO BOX 4182, OCEANSIDE, CA 92052-4182
PO BOX 4183, OCEANSIDE, CA 92052-4183
PO BOX 4184, OCEANSIDE, CA 92052-4184
PO BOX 4185, OCEANSIDE, CA 92052-4185
PO BOX 4186, OCEANSIDE, CA 92052-4186
PO BOX 4187, OCEANSIDE, CA 92052-4187
PO BOX 4188, OCEANSIDE, CA 92052-4188
PO BOX 4189, OCEANSIDE, CA 92052-4189
PO BOX 4190, OCEANSIDE, CA 92052-4190
PO BOX 4191, OCEANSIDE, CA 92052-4191
PO BOX 4192, OCEANSIDE, CA 92052-4192
PO BOX 4193, OCEANSIDE, CA 92052-4193
PO BOX 4194, OCEANSIDE, CA 92052-4194
PO BOX 4195, OCEANSIDE, CA 92052-4195
PO BOX 4196, OCEANSIDE, CA 92052-4196
PO BOX 4197, OCEANSIDE, CA 92052-4197
PO BOX 4198, OCEANSIDE, CA 92052-4198
PO BOX 4199, OCEANSIDE, CA 92052-4199
PO BOX 4200, OCEANSIDE, CA 92052-4200
PO BOX 4201, OCEANSIDE, CA 92052-4201
PO BOX 4202, OCEANSIDE, CA 92052-4202
PO BOX 4203, OCEANSIDE, CA 92052-4203
PO BOX 4204, OCEANSIDE, CA 92052-4204
PO BOX 4205, OCEANSIDE, CA 92052-4205
PO BOX 4206, OCEANSIDE, CA 92052-4206
PO BOX 4207, OCEANSIDE, CA 92052-4207
PO BOX 4208, OCEANSIDE, CA 92052-4208
PO BOX 4209, OCEANSIDE, CA 92052-4209
PO BOX 4210, OCEANSIDE, CA 92052-4210
PO BOX 4211, OCEANSIDE, CA 92052-4211
PO BOX 4212, OCEANSIDE, CA 92052-4212
PO BOX 4213, OCEANSIDE, CA 92052-4213
PO BOX 4214, OCEANSIDE, CA 92052-4214
PO BOX 4215, OCEANSIDE, CA 92052-4215
PO BOX 4216, OCEANSIDE, CA 92052-4216
PO BOX 4217, OCEANSIDE, CA 92052-4217
PO BOX 4218, OCEANSIDE, CA 92052-4218
PO BOX 4219, OCEANSIDE, CA 92052-4219
PO BOX 4220, OCEANSIDE, CA 92052-4220
PO BOX 4221, OCEANSIDE, CA 92052-4221
PO BOX 4222, OCEANSIDE, CA 92052-4222
PO BOX 4223, OCEANSIDE, CA 92052-4223
PO BOX 4224, OCEANSIDE, CA 92052-4224
PO BOX 4225, OCEANSIDE, CA 92052-4225
PO BOX 4226, OCEANSIDE, CA 92052-4226
PO BOX 4227, OCEANSIDE, CA 92052-4227
PO BOX 4228, OCEANSIDE, CA 92052-4228
PO BOX 4229, OCEANSIDE, CA 92052-4229
PO BOX 4230, OCEANSIDE, CA 92052-4230
PO BOX 4231, OCEANSIDE, CA 92052-4231
PO BOX 4232, OCEANSIDE, CA 92052-4232
PO BOX 4233, OCEANSIDE, CA 92052-4233
PO BOX 4234, OCEANSIDE, CA 92052-4234
PO BOX 4235, OCEANSIDE, CA 92052-4235
PO BOX 4236, OCEANSIDE, CA 92052-4236
PO BOX 4237, OCEANSIDE, CA 92052-4237
PO BOX 4238, OCEANSIDE, CA 92052-4238
PO BOX 4239, OCEANSIDE, CA 92052-4239
PO BOX 4240, OCEANSIDE, CA 92052-4240
PO BOX 4241, OCEANSIDE, CA 92052-4241
PO BOX 4242, OCEANSIDE, CA 92052-4242
PO BOX 4243, OCEANSIDE, CA 92052-4243
PO BOX 4244, OCEANSIDE, CA 92052-4244
PO BOX 4245, OCEANSIDE, CA 92052-4245
PO BOX 4246, OCEANSIDE, CA 92052-4246
PO BOX 4247, OCEANSIDE, CA 92052-4247
PO BOX 4248, OCEANSIDE, CA 92052-4248
PO BOX 4249, OCEANSIDE, CA 92052-4249
PO BOX 4250, OCEANSIDE, CA 92052-4250
PO BOX 4251, OCEANSIDE, CA 92052-4251
PO BOX 4252, OCEANSIDE, CA 92052-4252
PO BOX 4253, OCEANSIDE, CA 92052-4253
PO BOX 4254, OCEANSIDE, CA 92052-4254
PO BOX 4255, OCEANSIDE, CA 92052-4255
PO BOX 4256, OCEANSIDE, CA 92052-4256
PO BOX 4257, OCEANSIDE, CA 92052-4257
PO BOX 4258, OCEANSIDE, CA 92052-4258
PO BOX 4259, OCEANSIDE, CA 92052-4259
PO BOX 4260, OCEANSIDE, CA 92052-4260
PO BOX 4261, OCEANSIDE, CA 92052-4261
PO BOX 4262, OCEANSIDE, CA 92052-4262
PO BOX 4263, OCEANSIDE, CA 92052-4263
PO BOX 4264, OCEANSIDE, CA 92052-4264
PO BOX 4265, OCEANSIDE, CA 92052-4265
PO BOX 4266, OCEANSIDE, CA 92052-4266
PO BOX 4267, OCEANSIDE, CA 92052-4267
PO BOX 4268, OCEANSIDE, CA 92052-4268
PO BOX 4269, OCEANSIDE, CA 92052-4269
PO BOX 4270, OCEANSIDE, CA 92052-4270
PO BOX 4271, OCEANSIDE, CA 92052-4271
PO BOX 4272, OCEANSIDE, CA 92052-4272
PO BOX 4273, OCEANSIDE, CA 92052-4273
PO BOX 4274, OCEANSIDE, CA 92052-4274
PO BOX 4275, OCEANSIDE, CA 92052-4275
PO BOX 4276, OCEANSIDE, CA 92052-4276
PO BOX 4277, OCEANSIDE, CA 92052-4277
PO BOX 4278, OCEANSIDE, CA 92052-4278
PO BOX 4279, OCEANSIDE, CA 92052-4279
PO BOX 4280, OCEANSIDE, CA 92052-4280
PO BOX 4281, OCEANSIDE, CA 92052-4281
PO BOX 4282, OCEANSIDE, CA 92052-4282
PO BOX 4283, OCEANSIDE, CA 92052-4283
PO BOX 4284, OCEANSIDE, CA 92052-4284
PO BOX 4285, OCEANSIDE, CA 92052-4285
PO BOX 4286, OCEANSIDE, CA 92052-4286
PO BOX 4287, OCEANSIDE, CA 92052-4287
PO BOX 4288, OCEANSIDE, CA 92052-4288
PO BOX 4289, OCEANSIDE, CA 92052-4289
PO BOX 4290, OCEANSIDE, CA 92052-4290
PO BOX 4291, OCEANSIDE, CA 92052-4291
PO BOX 4292, OCEANSIDE, CA 92052-4292
PO BOX 4293, OCEANSIDE, CA 92052-4293
PO BOX 4294, OCEANSIDE, CA 92052-4294
PO BOX 4295, OCEANSIDE, CA 92052-4295
PO BOX 4296, OCEANSIDE, CA 92052-4296
PO BOX 4297, OCEANSIDE, CA 92052-4297
PO BOX 4298, OCEANSIDE, CA 92052-4298
PO BOX 4299, OCEANSIDE, CA 92052-4299
PO BOX 4300, OCEANSIDE, CA 92052-4300
PO BOX 4301, OCEANSIDE, CA 92052-4301
PO BOX 4302, OCEANSIDE, CA 92052-4302
PO BOX 4303, OCEANSIDE, CA 92052-4303
PO BOX 4304, OCEANSIDE, CA 92052-4304
PO BOX 4305, OCEANSIDE, CA 92052-4305
PO BOX 4306, OCEANSIDE, CA 92052-4306
PO BOX 4307, OCEANSIDE, CA 92052-4307
PO BOX 4308, OCEANSIDE, CA 92052-4308
PO BOX 4309, OCEANSIDE, CA 92052-4309
PO BOX 4310, OCEANSIDE, CA 92052-4310
PO BOX 4311, OCEANSIDE, CA 92052-4311
PO BOX 4312, OCEANSIDE, CA 92052-4312
PO BOX 4313, OCEANSIDE, CA 92052-4313
PO BOX 4314, OCEANSIDE, CA 92052-4314
PO BOX 4315, OCEANSIDE, CA 92052-4315
PO BOX 4316, OCEANSIDE, CA 92052-4316
PO BOX 4317, OCEANSIDE, CA 92052-4317
PO BOX 4318, OCEANSIDE, CA 92052-4318
PO BOX 4319, OCEANSIDE, CA 92052-4319
PO BOX 4320, OCEANSIDE, CA 92052-4320
PO BOX 4321, OCEANSIDE, CA 92052-4321
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