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 433120, SAN YSIDRO, CA 92143-3120
PO BOX 433121, SAN YSIDRO, CA 92143-3121
PO BOX 433122, SAN YSIDRO, CA 92143-3122
PO BOX 433123, SAN YSIDRO, CA 92143-3123
PO BOX 433124, SAN YSIDRO, CA 92143-3124
PO BOX 433125, SAN YSIDRO, CA 92143-3125
PO BOX 433126, SAN YSIDRO, CA 92143-3126
PO BOX 433127, SAN YSIDRO, CA 92143-3127
PO BOX 433128, SAN YSIDRO, CA 92143-3128
PO BOX 433129, SAN YSIDRO, CA 92143-3129
PO BOX 433130, SAN YSIDRO, CA 92143-3130
PO BOX 433131, SAN YSIDRO, CA 92143-3131
PO BOX 433132, SAN YSIDRO, CA 92143-3132
PO BOX 433133, SAN YSIDRO, CA 92143-3133
PO BOX 433134, SAN YSIDRO, CA 92143-3134
PO BOX 433135, SAN YSIDRO, CA 92143-3135
PO BOX 433136, SAN YSIDRO, CA 92143-3136
PO BOX 433137, SAN YSIDRO, CA 92143-3137
PO BOX 433138, SAN YSIDRO, CA 92143-3138
PO BOX 433139, SAN YSIDRO, CA 92143-3139
PO BOX 433140, SAN YSIDRO, CA 92143-3140
PO BOX 433141, SAN YSIDRO, CA 92143-3141
PO BOX 433142, SAN YSIDRO, CA 92143-3142
PO BOX 433143, SAN YSIDRO, CA 92143-3143
PO BOX 433144, SAN YSIDRO, CA 92143-3144
PO BOX 433145, SAN YSIDRO, CA 92143-3145
PO BOX 433146, SAN YSIDRO, CA 92143-3146
PO BOX 433147, SAN YSIDRO, CA 92143-3147
PO BOX 433148, SAN YSIDRO, CA 92143-3148
PO BOX 433149, SAN YSIDRO, CA 92143-3149
PO BOX 433150, SAN YSIDRO, CA 92143-3150
PO BOX 433151, SAN YSIDRO, CA 92143-3151
PO BOX 433152, SAN YSIDRO, CA 92143-3152
PO BOX 433153, SAN YSIDRO, CA 92143-3153
PO BOX 433154, SAN YSIDRO, CA 92143-3154
PO BOX 433155, SAN YSIDRO, CA 92143-3155
PO BOX 433156, SAN YSIDRO, CA 92143-3156
PO BOX 433157, SAN YSIDRO, CA 92143-3157
PO BOX 433158, SAN YSIDRO, CA 92143-3158
PO BOX 433159, SAN YSIDRO, CA 92143-3159
PO BOX 433160, SAN YSIDRO, CA 92143-3160
PO BOX 433161, SAN YSIDRO, CA 92143-3161
PO BOX 433162, SAN YSIDRO, CA 92143-3162
PO BOX 433163, SAN YSIDRO, CA 92143-3163
PO BOX 433164, SAN YSIDRO, CA 92143-3164
PO BOX 433165, SAN YSIDRO, CA 92143-3165
PO BOX 433166, SAN YSIDRO, CA 92143-3166
PO BOX 433167, SAN YSIDRO, CA 92143-3167
PO BOX 433168, SAN YSIDRO, CA 92143-3168
PO BOX 433169, SAN YSIDRO, CA 92143-3169
PO BOX 433170, SAN YSIDRO, CA 92143-3170
PO BOX 433171, SAN YSIDRO, CA 92143-3171
PO BOX 433172, SAN YSIDRO, CA 92143-3172
PO BOX 433173, SAN YSIDRO, CA 92143-3173
PO BOX 433174, SAN YSIDRO, CA 92143-3174
PO BOX 433175, SAN YSIDRO, CA 92143-3175
PO BOX 433176, SAN YSIDRO, CA 92143-3176
PO BOX 433177, SAN YSIDRO, CA 92143-3177
PO BOX 433178, SAN YSIDRO, CA 92143-3178
PO BOX 433179, SAN YSIDRO, CA 92143-3179
PO BOX 433180, SAN YSIDRO, CA 92143-3180
PO BOX 433181, SAN YSIDRO, CA 92143-3181
PO BOX 433182, SAN YSIDRO, CA 92143-3182
PO BOX 433183, SAN YSIDRO, CA 92143-3183
PO BOX 433184, SAN YSIDRO, CA 92143-3184
PO BOX 433185, SAN YSIDRO, CA 92143-3185
PO BOX 433186, SAN YSIDRO, CA 92143-3186
PO BOX 433187, SAN YSIDRO, CA 92143-3187
PO BOX 433188, SAN YSIDRO, CA 92143-3188
PO BOX 433189, SAN YSIDRO, CA 92143-3189
PO BOX 433190, SAN YSIDRO, CA 92143-3190
PO BOX 433191, SAN YSIDRO, CA 92143-3191
PO BOX 433192, SAN YSIDRO, CA 92143-3192
PO BOX 433193, SAN YSIDRO, CA 92143-3193
PO BOX 433194, SAN YSIDRO, CA 92143-3194
PO BOX 433195, SAN YSIDRO, CA 92143-3195
PO BOX 433196, SAN YSIDRO, CA 92143-3196
PO BOX 433197, SAN YSIDRO, CA 92143-3197
PO BOX 433198, SAN YSIDRO, CA 92143-3198
PO BOX 433199, SAN YSIDRO, CA 92143-3199
PO BOX 433200, SAN YSIDRO, CA 92143-3200
PO BOX 433201, SAN YSIDRO, CA 92143-3201
PO BOX 433202, SAN YSIDRO, CA 92143-3202
PO BOX 433203, SAN YSIDRO, CA 92143-3203
PO BOX 433204, SAN YSIDRO, CA 92143-3204
PO BOX 433205, SAN YSIDRO, CA 92143-3205
PO BOX 433206, SAN YSIDRO, CA 92143-3206
PO BOX 433207, SAN YSIDRO, CA 92143-3207
PO BOX 433208, SAN YSIDRO, CA 92143-3208
PO BOX 433209, SAN YSIDRO, CA 92143-3209
PO BOX 433210, SAN YSIDRO, CA 92143-3210
PO BOX 433211, SAN YSIDRO, CA 92143-3211
PO BOX 433212, SAN YSIDRO, CA 92143-3212
PO BOX 433213, SAN YSIDRO, CA 92143-3213
PO BOX 433214, SAN YSIDRO, CA 92143-3214
PO BOX 433215, SAN YSIDRO, CA 92143-3215
PO BOX 433216, SAN YSIDRO, CA 92143-3216
PO BOX 433217, SAN YSIDRO, CA 92143-3217
PO BOX 433218, SAN YSIDRO, CA 92143-3218
PO BOX 433219, SAN YSIDRO, CA 92143-3219
PO BOX 433220, SAN YSIDRO, CA 92143-3220
PO BOX 433221, SAN YSIDRO, CA 92143-3221
PO BOX 433222, SAN YSIDRO, CA 92143-3222
PO BOX 433223, SAN YSIDRO, CA 92143-3223
PO BOX 433224, SAN YSIDRO, CA 92143-3224
PO BOX 433225, SAN YSIDRO, CA 92143-3225
PO BOX 433226, SAN YSIDRO, CA 92143-3226
PO BOX 433227, SAN YSIDRO, CA 92143-3227
PO BOX 433228, SAN YSIDRO, CA 92143-3228
PO BOX 433229, SAN YSIDRO, CA 92143-3229
PO BOX 433230, SAN YSIDRO, CA 92143-3230
PO BOX 433231, SAN YSIDRO, CA 92143-3231
PO BOX 433232, SAN YSIDRO, CA 92143-3232
PO BOX 433233, SAN YSIDRO, CA 92143-3233
PO BOX 433234, SAN YSIDRO, CA 92143-3234
PO BOX 433235, SAN YSIDRO, CA 92143-3235
PO BOX 433236, SAN YSIDRO, CA 92143-3236
PO BOX 433237, SAN YSIDRO, CA 92143-3237
PO BOX 433238, SAN YSIDRO, CA 92143-3238
PO BOX 433239, SAN YSIDRO, CA 92143-3239
PO BOX 433240, SAN YSIDRO, CA 92143-3240
PO BOX 433241, SAN YSIDRO, CA 92143-3241
PO BOX 433242, SAN YSIDRO, CA 92143-3242
PO BOX 433243, SAN YSIDRO, CA 92143-3243
PO BOX 433244, SAN YSIDRO, CA 92143-3244
PO BOX 433245, SAN YSIDRO, CA 92143-3245
PO BOX 433246, SAN YSIDRO, CA 92143-3246
PO BOX 433247, SAN YSIDRO, CA 92143-3247
PO BOX 433248, SAN YSIDRO, CA 92143-3248
PO BOX 433249, SAN YSIDRO, CA 92143-3249
PO BOX 433250, SAN YSIDRO, CA 92143-3250
PO BOX 433251, SAN YSIDRO, CA 92143-3251
PO BOX 433252, SAN YSIDRO, CA 92143-3252
PO BOX 433253, SAN YSIDRO, CA 92143-3253
PO BOX 433254, SAN YSIDRO, CA 92143-3254
PO BOX 433255, SAN YSIDRO, CA 92143-3255
PO BOX 433256, SAN YSIDRO, CA 92143-3256
PO BOX 433257, SAN YSIDRO, CA 92143-3257
PO BOX 433258, SAN YSIDRO, CA 92143-3258
PO BOX 433259, SAN YSIDRO, CA 92143-3259
PO BOX 433260, SAN YSIDRO, CA 92143-3260
PO BOX 433261, SAN YSIDRO, CA 92143-3261
PO BOX 433262, SAN YSIDRO, CA 92143-3262
PO BOX 433263, SAN YSIDRO, CA 92143-3263
PO BOX 433264, SAN YSIDRO, CA 92143-3264
PO BOX 433265, SAN YSIDRO, CA 92143-3265
PO BOX 433266, SAN YSIDRO, CA 92143-3266
PO BOX 433267, SAN YSIDRO, CA 92143-3267
PO BOX 433268, SAN YSIDRO, CA 92143-3268
PO BOX 433269, SAN YSIDRO, CA 92143-3269
PO BOX 433270, SAN YSIDRO, CA 92143-3270
PO BOX 433271, SAN YSIDRO, CA 92143-3271
PO BOX 433272, SAN YSIDRO, CA 92143-3272
PO BOX 433273, SAN YSIDRO, CA 92143-3273
PO BOX 433274, SAN YSIDRO, CA 92143-3274
PO BOX 433275, SAN YSIDRO, CA 92143-3275
PO BOX 433276, SAN YSIDRO, CA 92143-3276
PO BOX 433277, SAN YSIDRO, CA 92143-3277
PO BOX 433278, SAN YSIDRO, CA 92143-3278
PO BOX 433279, SAN YSIDRO, CA 92143-3279
PO BOX 433280, SAN YSIDRO, CA 92143-3280
PO BOX 433281, SAN YSIDRO, CA 92143-3281
PO BOX 433282, SAN YSIDRO, CA 92143-3282
PO BOX 433283, SAN YSIDRO, CA 92143-3283
PO BOX 433284, SAN YSIDRO, CA 92143-3284
PO BOX 433285, SAN YSIDRO, CA 92143-3285
PO BOX 433286, SAN YSIDRO, CA 92143-3286
PO BOX 433287, SAN YSIDRO, CA 92143-3287
PO BOX 433288, SAN YSIDRO, CA 92143-3288
PO BOX 433289, SAN YSIDRO, CA 92143-3289
PO BOX 433290, SAN YSIDRO, CA 92143-3290
PO BOX 433291, SAN YSIDRO, CA 92143-3291
PO BOX 433292, SAN YSIDRO, CA 92143-3292
PO BOX 433293, SAN YSIDRO, CA 92143-3293
PO BOX 433294, SAN YSIDRO, CA 92143-3294
PO BOX 433295, SAN YSIDRO, CA 92143-3295
PO BOX 433296, SAN YSIDRO, CA 92143-3296
PO BOX 433297, SAN YSIDRO, CA 92143-3297
PO BOX 433298, SAN YSIDRO, CA 92143-3298
PO BOX 433299, SAN YSIDRO, CA 92143-3299
PO BOX 433300, SAN YSIDRO, CA 92143-3300
PO BOX 433301, SAN YSIDRO, CA 92143-3301
PO BOX 433302, SAN YSIDRO, CA 92143-3302
PO BOX 433303, SAN YSIDRO, CA 92143-3303
PO BOX 433304, SAN YSIDRO, CA 92143-3304
PO BOX 433305, SAN YSIDRO, CA 92143-3305
PO BOX 433306, SAN YSIDRO, CA 92143-3306
PO BOX 433307, SAN YSIDRO, CA 92143-3307
PO BOX 433308, SAN YSIDRO, CA 92143-3308
PO BOX 433309, SAN YSIDRO, CA 92143-3309
PO BOX 433310, SAN YSIDRO, CA 92143-3310
PO BOX 433311, SAN YSIDRO, CA 92143-3311
PO BOX 433312, SAN YSIDRO, CA 92143-3312
PO BOX 433313, SAN YSIDRO, CA 92143-3313
PO BOX 433314, SAN YSIDRO, CA 92143-3314
PO BOX 433315, SAN YSIDRO, CA 92143-3315
PO BOX 433316, SAN YSIDRO, CA 92143-3316
PO BOX 433317, SAN YSIDRO, CA 92143-3317
PO BOX 433318, SAN YSIDRO, CA 92143-3318
PO BOX 433319, SAN YSIDRO, CA 92143-3319
PO BOX 433320, SAN YSIDRO, CA 92143-3320
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