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 3121, LA JOLLA, CA 92038-3121
PO BOX 3122, LA JOLLA, CA 92038-3122
PO BOX 3123, LA JOLLA, CA 92038-3123
PO BOX 3124, LA JOLLA, CA 92038-3124
PO BOX 3125, LA JOLLA, CA 92038-3125
PO BOX 3126, LA JOLLA, CA 92038-3126
PO BOX 3127, LA JOLLA, CA 92038-3127
PO BOX 3128, LA JOLLA, CA 92038-3128
PO BOX 3129, LA JOLLA, CA 92038-3129
PO BOX 3130, LA JOLLA, CA 92038-3130
PO BOX 3131, LA JOLLA, CA 92038-3131
PO BOX 3132, LA JOLLA, CA 92038-3132
PO BOX 3133, LA JOLLA, CA 92038-3133
PO BOX 3134, LA JOLLA, CA 92038-3134
PO BOX 3135, LA JOLLA, CA 92038-3135
PO BOX 3136, LA JOLLA, CA 92038-3136
PO BOX 3137, LA JOLLA, CA 92038-3137
PO BOX 3138, LA JOLLA, CA 92038-3138
PO BOX 3139, LA JOLLA, CA 92038-3139
PO BOX 3140, LA JOLLA, CA 92038-3140
PO BOX 3141, LA JOLLA, CA 92038-3141
PO BOX 3142, LA JOLLA, CA 92038-3142
PO BOX 3143, LA JOLLA, CA 92038-3143
PO BOX 3144, LA JOLLA, CA 92038-3144
PO BOX 3145, LA JOLLA, CA 92038-3145
PO BOX 3146, LA JOLLA, CA 92038-3146
PO BOX 3147, LA JOLLA, CA 92038-3147
PO BOX 3148, LA JOLLA, CA 92038-3148
PO BOX 3149, LA JOLLA, CA 92038-3149
PO BOX 3150, LA JOLLA, CA 92038-3150
PO BOX 3151, LA JOLLA, CA 92038-3151
PO BOX 3152, LA JOLLA, CA 92038-3152
PO BOX 3153, LA JOLLA, CA 92038-3153
PO BOX 3154, LA JOLLA, CA 92038-3154
PO BOX 3155, LA JOLLA, CA 92038-3155
PO BOX 3156, LA JOLLA, CA 92038-3156
PO BOX 3157, LA JOLLA, CA 92038-3157
PO BOX 3158, LA JOLLA, CA 92038-3158
PO BOX 3159, LA JOLLA, CA 92038-3159
PO BOX 3160, LA JOLLA, CA 92038-3160
PO BOX 3161, LA JOLLA, CA 92038-3161
PO BOX 3162, LA JOLLA, CA 92038-3162
PO BOX 3163, LA JOLLA, CA 92038-3163
PO BOX 3164, LA JOLLA, CA 92038-3164
PO BOX 3165, LA JOLLA, CA 92038-3165
PO BOX 3166, LA JOLLA, CA 92038-3166
PO BOX 3167, LA JOLLA, CA 92038-3167
PO BOX 3168, LA JOLLA, CA 92038-3168
PO BOX 3169, LA JOLLA, CA 92038-3169
PO BOX 3170, LA JOLLA, CA 92038-3170
PO BOX 3171, LA JOLLA, CA 92038-3171
PO BOX 3172, LA JOLLA, CA 92038-3172
PO BOX 3173, LA JOLLA, CA 92038-3173
PO BOX 3174, LA JOLLA, CA 92038-3174
PO BOX 3175, LA JOLLA, CA 92038-3175
PO BOX 3176, LA JOLLA, CA 92038-3176
PO BOX 3177, LA JOLLA, CA 92038-3177
PO BOX 3178, LA JOLLA, CA 92038-3178
PO BOX 3179, LA JOLLA, CA 92038-3179
PO BOX 3180, LA JOLLA, CA 92038-3180
PO BOX 3181, LA JOLLA, CA 92038-3181
PO BOX 3182, LA JOLLA, CA 92038-3182
PO BOX 3183, LA JOLLA, CA 92038-3183
PO BOX 3184, LA JOLLA, CA 92038-3184
PO BOX 3185, LA JOLLA, CA 92038-3185
PO BOX 3186, LA JOLLA, CA 92038-3186
PO BOX 3187, LA JOLLA, CA 92038-3187
PO BOX 3188, LA JOLLA, CA 92038-3188
PO BOX 3189, LA JOLLA, CA 92038-3189
PO BOX 3190, LA JOLLA, CA 92038-3190
PO BOX 3191, LA JOLLA, CA 92038-3191
PO BOX 3192, LA JOLLA, CA 92038-3192
PO BOX 3193, LA JOLLA, CA 92038-3193
PO BOX 3194, LA JOLLA, CA 92038-3194
PO BOX 3195, LA JOLLA, CA 92038-3195
PO BOX 3196, LA JOLLA, CA 92038-3196
PO BOX 3197, LA JOLLA, CA 92038-3197
PO BOX 3198, LA JOLLA, CA 92038-3198
PO BOX 3199, LA JOLLA, CA 92038-3199
PO BOX 3200, LA JOLLA, CA 92038-3200
PO BOX 3201, LA JOLLA, CA 92038-3201
PO BOX 3202, LA JOLLA, CA 92038-3202
PO BOX 3203, LA JOLLA, CA 92038-3203
PO BOX 3204, LA JOLLA, CA 92038-3204
PO BOX 3205, LA JOLLA, CA 92038-3205
PO BOX 3206, LA JOLLA, CA 92038-3206
PO BOX 3207, LA JOLLA, CA 92038-3207
PO BOX 3208, LA JOLLA, CA 92038-3208
PO BOX 3209, LA JOLLA, CA 92038-3209
PO BOX 3210, LA JOLLA, CA 92038-3210
PO BOX 3211, LA JOLLA, CA 92038-3211
PO BOX 3212, LA JOLLA, CA 92038-3212
PO BOX 3213, LA JOLLA, CA 92038-3213
PO BOX 3214, LA JOLLA, CA 92038-3214
PO BOX 3215, LA JOLLA, CA 92038-3215
PO BOX 3216, LA JOLLA, CA 92038-3216
PO BOX 3217, LA JOLLA, CA 92038-3217
PO BOX 3218, LA JOLLA, CA 92038-3218
PO BOX 3219, LA JOLLA, CA 92038-3219
PO BOX 3220, LA JOLLA, CA 92038-3220
PO BOX 3221, LA JOLLA, CA 92038-3221
PO BOX 3222, LA JOLLA, CA 92038-3222
PO BOX 3223, LA JOLLA, CA 92038-3223
PO BOX 3224, LA JOLLA, CA 92038-3224
PO BOX 3225, LA JOLLA, CA 92038-3225
PO BOX 3226, LA JOLLA, CA 92038-3226
PO BOX 3227, LA JOLLA, CA 92038-3227
PO BOX 3228, LA JOLLA, CA 92038-3228
PO BOX 3229, LA JOLLA, CA 92038-3229
PO BOX 3230, LA JOLLA, CA 92038-3230
PO BOX 3231, LA JOLLA, CA 92038-3231
PO BOX 3232, LA JOLLA, CA 92038-3232
PO BOX 3233, LA JOLLA, CA 92038-3233
PO BOX 3234, LA JOLLA, CA 92038-3234
PO BOX 3235, LA JOLLA, CA 92038-3235
PO BOX 3236, LA JOLLA, CA 92038-3236
PO BOX 3237, LA JOLLA, CA 92038-3237
PO BOX 3238, LA JOLLA, CA 92038-3238
PO BOX 3239, LA JOLLA, CA 92038-3239
PO BOX 3240, LA JOLLA, CA 92038-3240
PO BOX 3241, LA JOLLA, CA 92038-3241
PO BOX 3242, LA JOLLA, CA 92038-3242
PO BOX 3243, LA JOLLA, CA 92038-3243
PO BOX 3244, LA JOLLA, CA 92038-3244
PO BOX 3245, LA JOLLA, CA 92038-3245
PO BOX 3246, LA JOLLA, CA 92038-3246
PO BOX 3247, LA JOLLA, CA 92038-3247
PO BOX 3248, LA JOLLA, CA 92038-3248
PO BOX 3249, LA JOLLA, CA 92038-3249
PO BOX 3250, LA JOLLA, CA 92038-3250
PO BOX 3251, LA JOLLA, CA 92038-3251
PO BOX 3252, LA JOLLA, CA 92038-3252
PO BOX 3253, LA JOLLA, CA 92038-3253
PO BOX 3254, LA JOLLA, CA 92038-3254
PO BOX 3255, LA JOLLA, CA 92038-3255
PO BOX 3256, LA JOLLA, CA 92038-3256
PO BOX 3257, LA JOLLA, CA 92038-3257
PO BOX 3258, LA JOLLA, CA 92038-3258
PO BOX 3259, LA JOLLA, CA 92038-3259
PO BOX 3260, LA JOLLA, CA 92038-3260
PO BOX 3261, LA JOLLA, CA 92038-3261
PO BOX 3262, LA JOLLA, CA 92038-3262
PO BOX 3263, LA JOLLA, CA 92038-3263
PO BOX 3264, LA JOLLA, CA 92038-3264
PO BOX 3265, LA JOLLA, CA 92038-3265
PO BOX 3266, LA JOLLA, CA 92038-3266
PO BOX 3267, LA JOLLA, CA 92038-3267
PO BOX 3268, LA JOLLA, CA 92038-3268
PO BOX 3269, LA JOLLA, CA 92038-3269
PO BOX 3270, LA JOLLA, CA 92038-3270
PO BOX 3271, LA JOLLA, CA 92038-3271
PO BOX 3272, LA JOLLA, CA 92038-3272
PO BOX 3273, LA JOLLA, CA 92038-3273
PO BOX 3274, LA JOLLA, CA 92038-3274
PO BOX 3275, LA JOLLA, CA 92038-3275
PO BOX 3276, LA JOLLA, CA 92038-3276
PO BOX 3277, LA JOLLA, CA 92038-3277
PO BOX 3278, LA JOLLA, CA 92038-3278
PO BOX 3279, LA JOLLA, CA 92038-3279
PO BOX 3280, LA JOLLA, CA 92038-3280
PO BOX 3281, LA JOLLA, CA 92038-3281
PO BOX 3282, LA JOLLA, CA 92038-3282
PO BOX 3283, LA JOLLA, CA 92038-3283
PO BOX 3284, LA JOLLA, CA 92038-3284
PO BOX 3285, LA JOLLA, CA 92038-3285
PO BOX 3286, LA JOLLA, CA 92038-3286
PO BOX 3287, LA JOLLA, CA 92038-3287
PO BOX 3288, LA JOLLA, CA 92038-3288
PO BOX 3289, LA JOLLA, CA 92038-3289
PO BOX 3290, LA JOLLA, CA 92038-3290
PO BOX 3291, LA JOLLA, CA 92038-3291
PO BOX 3292, LA JOLLA, CA 92038-3292
PO BOX 3293, LA JOLLA, CA 92038-3293
PO BOX 3294, LA JOLLA, CA 92038-3294
PO BOX 3295, LA JOLLA, CA 92038-3295
PO BOX 3296, LA JOLLA, CA 92038-3296
PO BOX 3297, LA JOLLA, CA 92038-3297
PO BOX 3298, LA JOLLA, CA 92038-3298
PO BOX 3299, LA JOLLA, CA 92038-3299
PO BOX 3300, LA JOLLA, CA 92038-3300
PO BOX 3301, LA JOLLA, CA 92038-3301
PO BOX 3302, LA JOLLA, CA 92038-3302
PO BOX 3303, LA JOLLA, CA 92038-3303
PO BOX 3304, LA JOLLA, CA 92038-3304
PO BOX 3305, LA JOLLA, CA 92038-3305
PO BOX 3306, LA JOLLA, CA 92038-3306
PO BOX 3307, LA JOLLA, CA 92038-3307
PO BOX 3308, LA JOLLA, CA 92038-3308
PO BOX 3309, LA JOLLA, CA 92038-3309
PO BOX 3310, LA JOLLA, CA 92038-3310
PO BOX 3311, LA JOLLA, CA 92038-3311
PO BOX 3312, LA JOLLA, CA 92038-3312
PO BOX 3313, LA JOLLA, CA 92038-3313
PO BOX 3314, LA JOLLA, CA 92038-3314
PO BOX 3315, LA JOLLA, CA 92038-3315
PO BOX 3316, LA JOLLA, CA 92038-3316
PO BOX 3317, LA JOLLA, CA 92038-3317
PO BOX 3318, LA JOLLA, CA 92038-3318
PO BOX 3319, LA JOLLA, CA 92038-3319
PO BOX 3320, LA JOLLA, CA 92038-3320
PO BOX 3321, LA JOLLA, CA 92038-3321
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