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 435140, SAN YSIDRO, CA 92143-5140
PO BOX 435141, SAN YSIDRO, CA 92143-5141
PO BOX 435142, SAN YSIDRO, CA 92143-5142
PO BOX 435143, SAN YSIDRO, CA 92143-5143
PO BOX 435144, SAN YSIDRO, CA 92143-5144
PO BOX 435145, SAN YSIDRO, CA 92143-5145
PO BOX 435146, SAN YSIDRO, CA 92143-5146
PO BOX 435147, SAN YSIDRO, CA 92143-5147
PO BOX 435148, SAN YSIDRO, CA 92143-5148
PO BOX 435149, SAN YSIDRO, CA 92143-5149
PO BOX 435150, SAN YSIDRO, CA 92143-5150
PO BOX 435151, SAN YSIDRO, CA 92143-5151
PO BOX 435152, SAN YSIDRO, CA 92143-5152
PO BOX 435153, SAN YSIDRO, CA 92143-5153
PO BOX 435154, SAN YSIDRO, CA 92143-5154
PO BOX 435155, SAN YSIDRO, CA 92143-5155
PO BOX 435156, SAN YSIDRO, CA 92143-5156
PO BOX 435157, SAN YSIDRO, CA 92143-5157
PO BOX 435158, SAN YSIDRO, CA 92143-5158
PO BOX 435159, SAN YSIDRO, CA 92143-5159
PO BOX 435160, SAN YSIDRO, CA 92143-5160
PO BOX 435161, SAN YSIDRO, CA 92143-5161
PO BOX 435162, SAN YSIDRO, CA 92143-5162
PO BOX 435163, SAN YSIDRO, CA 92143-5163
PO BOX 435164, SAN YSIDRO, CA 92143-5164
PO BOX 435165, SAN YSIDRO, CA 92143-5165
PO BOX 435166, SAN YSIDRO, CA 92143-5166
PO BOX 435167, SAN YSIDRO, CA 92143-5167
PO BOX 435168, SAN YSIDRO, CA 92143-5168
PO BOX 435169, SAN YSIDRO, CA 92143-5169
PO BOX 435170, SAN YSIDRO, CA 92143-5170
PO BOX 435171, SAN YSIDRO, CA 92143-5171
PO BOX 435172, SAN YSIDRO, CA 92143-5172
PO BOX 435173, SAN YSIDRO, CA 92143-5173
PO BOX 435174, SAN YSIDRO, CA 92143-5174
PO BOX 435175, SAN YSIDRO, CA 92143-5175
PO BOX 435176, SAN YSIDRO, CA 92143-5176
PO BOX 435177, SAN YSIDRO, CA 92143-5177
PO BOX 435178, SAN YSIDRO, CA 92143-5178
PO BOX 435179, SAN YSIDRO, CA 92143-5179
PO BOX 435180, SAN YSIDRO, CA 92143-5180
PO BOX 435181, SAN YSIDRO, CA 92143-5181
PO BOX 435182, SAN YSIDRO, CA 92143-5182
PO BOX 435183, SAN YSIDRO, CA 92143-5183
PO BOX 435184, SAN YSIDRO, CA 92143-5184
PO BOX 435185, SAN YSIDRO, CA 92143-5185
PO BOX 435186, SAN YSIDRO, CA 92143-5186
PO BOX 435187, SAN YSIDRO, CA 92143-5187
PO BOX 435188, SAN YSIDRO, CA 92143-5188
PO BOX 435189, SAN YSIDRO, CA 92143-5189
PO BOX 435190, SAN YSIDRO, CA 92143-5190
PO BOX 435191, SAN YSIDRO, CA 92143-5191
PO BOX 435192, SAN YSIDRO, CA 92143-5192
PO BOX 435193, SAN YSIDRO, CA 92143-5193
PO BOX 435194, SAN YSIDRO, CA 92143-5194
PO BOX 435195, SAN YSIDRO, CA 92143-5195
PO BOX 435196, SAN YSIDRO, CA 92143-5196
PO BOX 435197, SAN YSIDRO, CA 92143-5197
PO BOX 435198, SAN YSIDRO, CA 92143-5198
PO BOX 435199, SAN YSIDRO, CA 92143-5199
PO BOX 435200, SAN YSIDRO, CA 92143-5200
PO BOX 435201, SAN YSIDRO, CA 92143-5201
PO BOX 435202, SAN YSIDRO, CA 92143-5202
PO BOX 435203, SAN YSIDRO, CA 92143-5203
PO BOX 435204, SAN YSIDRO, CA 92143-5204
PO BOX 435205, SAN YSIDRO, CA 92143-5205
PO BOX 435206, SAN YSIDRO, CA 92143-5206
PO BOX 435207, SAN YSIDRO, CA 92143-5207
PO BOX 435208, SAN YSIDRO, CA 92143-5208
PO BOX 435209, SAN YSIDRO, CA 92143-5209
PO BOX 435210, SAN YSIDRO, CA 92143-5210
PO BOX 435211, SAN YSIDRO, CA 92143-5211
PO BOX 435212, SAN YSIDRO, CA 92143-5212
PO BOX 435213, SAN YSIDRO, CA 92143-5213
PO BOX 435214, SAN YSIDRO, CA 92143-5214
PO BOX 435215, SAN YSIDRO, CA 92143-5215
PO BOX 435216, SAN YSIDRO, CA 92143-5216
PO BOX 435217, SAN YSIDRO, CA 92143-5217
PO BOX 435218, SAN YSIDRO, CA 92143-5218
PO BOX 435219, SAN YSIDRO, CA 92143-5219
PO BOX 435220, SAN YSIDRO, CA 92143-5220
PO BOX 435221, SAN YSIDRO, CA 92143-5221
PO BOX 435222, SAN YSIDRO, CA 92143-5222
PO BOX 435223, SAN YSIDRO, CA 92143-5223
PO BOX 435224, SAN YSIDRO, CA 92143-5224
PO BOX 435225, SAN YSIDRO, CA 92143-5225
PO BOX 435226, SAN YSIDRO, CA 92143-5226
PO BOX 435227, SAN YSIDRO, CA 92143-5227
PO BOX 435228, SAN YSIDRO, CA 92143-5228
PO BOX 435229, SAN YSIDRO, CA 92143-5229
PO BOX 435230, SAN YSIDRO, CA 92143-5230
PO BOX 435231, SAN YSIDRO, CA 92143-5231
PO BOX 435232, SAN YSIDRO, CA 92143-5232
PO BOX 435233, SAN YSIDRO, CA 92143-5233
PO BOX 435234, SAN YSIDRO, CA 92143-5234
PO BOX 435235, SAN YSIDRO, CA 92143-5235
PO BOX 435236, SAN YSIDRO, CA 92143-5236
PO BOX 435237, SAN YSIDRO, CA 92143-5237
PO BOX 435238, SAN YSIDRO, CA 92143-5238
PO BOX 435239, SAN YSIDRO, CA 92143-5239
PO BOX 435240, SAN YSIDRO, CA 92143-5240
PO BOX 435241, SAN YSIDRO, CA 92143-5241
PO BOX 435242, SAN YSIDRO, CA 92143-5242
PO BOX 435243, SAN YSIDRO, CA 92143-5243
PO BOX 435244, SAN YSIDRO, CA 92143-5244
PO BOX 435245, SAN YSIDRO, CA 92143-5245
PO BOX 435246, SAN YSIDRO, CA 92143-5246
PO BOX 435247, SAN YSIDRO, CA 92143-5247
PO BOX 435248, SAN YSIDRO, CA 92143-5248
PO BOX 435249, SAN YSIDRO, CA 92143-5249
PO BOX 435250, SAN YSIDRO, CA 92143-5250
PO BOX 435251, SAN YSIDRO, CA 92143-5251
PO BOX 435252, SAN YSIDRO, CA 92143-5252
PO BOX 435253, SAN YSIDRO, CA 92143-5253
PO BOX 435254, SAN YSIDRO, CA 92143-5254
PO BOX 435255, SAN YSIDRO, CA 92143-5255
PO BOX 435256, SAN YSIDRO, CA 92143-5256
PO BOX 435257, SAN YSIDRO, CA 92143-5257
PO BOX 435258, SAN YSIDRO, CA 92143-5258
PO BOX 435259, SAN YSIDRO, CA 92143-5259
PO BOX 435260, SAN YSIDRO, CA 92143-5260
PO BOX 435261, SAN YSIDRO, CA 92143-5261
PO BOX 435262, SAN YSIDRO, CA 92143-5262
PO BOX 435263, SAN YSIDRO, CA 92143-5263
PO BOX 435264, SAN YSIDRO, CA 92143-5264
PO BOX 435265, SAN YSIDRO, CA 92143-5265
PO BOX 435266, SAN YSIDRO, CA 92143-5266
PO BOX 435267, SAN YSIDRO, CA 92143-5267
PO BOX 435268, SAN YSIDRO, CA 92143-5268
PO BOX 435269, SAN YSIDRO, CA 92143-5269
PO BOX 435270, SAN YSIDRO, CA 92143-5270
PO BOX 435271, SAN YSIDRO, CA 92143-5271
PO BOX 435272, SAN YSIDRO, CA 92143-5272
PO BOX 435273, SAN YSIDRO, CA 92143-5273
PO BOX 435274, SAN YSIDRO, CA 92143-5274
PO BOX 435275, SAN YSIDRO, CA 92143-5275
PO BOX 435276, SAN YSIDRO, CA 92143-5276
PO BOX 435277, SAN YSIDRO, CA 92143-5277
PO BOX 435278, SAN YSIDRO, CA 92143-5278
PO BOX 435279, SAN YSIDRO, CA 92143-5279
PO BOX 435280, SAN YSIDRO, CA 92143-5280
PO BOX 435281, SAN YSIDRO, CA 92143-5281
PO BOX 435282, SAN YSIDRO, CA 92143-5282
PO BOX 435283, SAN YSIDRO, CA 92143-5283
PO BOX 435284, SAN YSIDRO, CA 92143-5284
PO BOX 435285, SAN YSIDRO, CA 92143-5285
PO BOX 435286, SAN YSIDRO, CA 92143-5286
PO BOX 435287, SAN YSIDRO, CA 92143-5287
PO BOX 435288, SAN YSIDRO, CA 92143-5288
PO BOX 435289, SAN YSIDRO, CA 92143-5289
PO BOX 435290, SAN YSIDRO, CA 92143-5290
PO BOX 435291, SAN YSIDRO, CA 92143-5291
PO BOX 435292, SAN YSIDRO, CA 92143-5292
PO BOX 435293, SAN YSIDRO, CA 92143-5293
PO BOX 435294, SAN YSIDRO, CA 92143-5294
PO BOX 435295, SAN YSIDRO, CA 92143-5295
PO BOX 435296, SAN YSIDRO, CA 92143-5296
PO BOX 435297, SAN YSIDRO, CA 92143-5297
PO BOX 435298, SAN YSIDRO, CA 92143-5298
PO BOX 435299, SAN YSIDRO, CA 92143-5299
PO BOX 435300, SAN YSIDRO, CA 92143-5300
PO BOX 435301, SAN YSIDRO, CA 92143-5301
PO BOX 435302, SAN YSIDRO, CA 92143-5302
PO BOX 435303, SAN YSIDRO, CA 92143-5303
PO BOX 435304, SAN YSIDRO, CA 92143-5304
PO BOX 435305, SAN YSIDRO, CA 92143-5305
PO BOX 435306, SAN YSIDRO, CA 92143-5306
PO BOX 435307, SAN YSIDRO, CA 92143-5307
PO BOX 435308, SAN YSIDRO, CA 92143-5308
PO BOX 435309, SAN YSIDRO, CA 92143-5309
PO BOX 435310, SAN YSIDRO, CA 92143-5310
PO BOX 435311, SAN YSIDRO, CA 92143-5311
PO BOX 435312, SAN YSIDRO, CA 92143-5312
PO BOX 435313, SAN YSIDRO, CA 92143-5313
PO BOX 435314, SAN YSIDRO, CA 92143-5314
PO BOX 435315, SAN YSIDRO, CA 92143-5315
PO BOX 435316, SAN YSIDRO, CA 92143-5316
PO BOX 435317, SAN YSIDRO, CA 92143-5317
PO BOX 435318, SAN YSIDRO, CA 92143-5318
PO BOX 435319, SAN YSIDRO, CA 92143-5319
PO BOX 435320, SAN YSIDRO, CA 92143-5320
PO BOX 435321, SAN YSIDRO, CA 92143-5321
PO BOX 435322, SAN YSIDRO, CA 92143-5322
PO BOX 435323, SAN YSIDRO, CA 92143-5323
PO BOX 435324, SAN YSIDRO, CA 92143-5324
PO BOX 435325, SAN YSIDRO, CA 92143-5325
PO BOX 435326, SAN YSIDRO, CA 92143-5326
PO BOX 435327, SAN YSIDRO, CA 92143-5327
PO BOX 435328, SAN YSIDRO, CA 92143-5328
PO BOX 435329, SAN YSIDRO, CA 92143-5329
PO BOX 435330, SAN YSIDRO, CA 92143-5330
PO BOX 435331, SAN YSIDRO, CA 92143-5331
PO BOX 435332, SAN YSIDRO, CA 92143-5332
PO BOX 435333, SAN YSIDRO, CA 92143-5333
PO BOX 435334, SAN YSIDRO, CA 92143-5334
PO BOX 435335, SAN YSIDRO, CA 92143-5335
PO BOX 435336, SAN YSIDRO, CA 92143-5336
PO BOX 435337, SAN YSIDRO, CA 92143-5337
PO BOX 435338, SAN YSIDRO, CA 92143-5338
PO BOX 435339, SAN YSIDRO, CA 92143-5339
PO BOX 435340, SAN YSIDRO, CA 92143-5340
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