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, CHATSWORTH, CA 91313-3121
PO BOX 3122, CHATSWORTH, CA 91313-3122
PO BOX 3123, CHATSWORTH, CA 91313-3123
PO BOX 3124, CHATSWORTH, CA 91313-3124
PO BOX 3125, CHATSWORTH, CA 91313-3125
PO BOX 3126, CHATSWORTH, CA 91313-3126
PO BOX 3127, CHATSWORTH, CA 91313-3127
PO BOX 3128, CHATSWORTH, CA 91313-3128
PO BOX 3129, CHATSWORTH, CA 91313-3129
PO BOX 3130, CHATSWORTH, CA 91313-3130
PO BOX 3131, CHATSWORTH, CA 91313-3131
PO BOX 3132, CHATSWORTH, CA 91313-3132
PO BOX 3133, CHATSWORTH, CA 91313-3133
PO BOX 3134, CHATSWORTH, CA 91313-3134
PO BOX 3135, CHATSWORTH, CA 91313-3135
PO BOX 3136, CHATSWORTH, CA 91313-3136
PO BOX 3137, CHATSWORTH, CA 91313-3137
PO BOX 3138, CHATSWORTH, CA 91313-3138
PO BOX 3139, CHATSWORTH, CA 91313-3139
PO BOX 3140, CHATSWORTH, CA 91313-3140
PO BOX 3141, CHATSWORTH, CA 91313-3141
PO BOX 3142, CHATSWORTH, CA 91313-3142
PO BOX 3143, CHATSWORTH, CA 91313-3143
PO BOX 3144, CHATSWORTH, CA 91313-3144
PO BOX 3145, CHATSWORTH, CA 91313-3145
PO BOX 3146, CHATSWORTH, CA 91313-3146
PO BOX 3147, CHATSWORTH, CA 91313-3147
PO BOX 3148, CHATSWORTH, CA 91313-3148
PO BOX 3149, CHATSWORTH, CA 91313-3149
PO BOX 3150, CHATSWORTH, CA 91313-3150
PO BOX 3151, CHATSWORTH, CA 91313-3151
PO BOX 3152, CHATSWORTH, CA 91313-3152
PO BOX 3153, CHATSWORTH, CA 91313-3153
PO BOX 3154, CHATSWORTH, CA 91313-3154
PO BOX 3155, CHATSWORTH, CA 91313-3155
PO BOX 3156, CHATSWORTH, CA 91313-3156
PO BOX 3157, CHATSWORTH, CA 91313-3157
PO BOX 3158, CHATSWORTH, CA 91313-3158
PO BOX 3159, CHATSWORTH, CA 91313-3159
PO BOX 3160, CHATSWORTH, CA 91313-3160
PO BOX 3161, CHATSWORTH, CA 91313-3161
PO BOX 3162, CHATSWORTH, CA 91313-3162
PO BOX 3163, CHATSWORTH, CA 91313-3163
PO BOX 3164, CHATSWORTH, CA 91313-3164
PO BOX 3165, CHATSWORTH, CA 91313-3165
PO BOX 3166, CHATSWORTH, CA 91313-3166
PO BOX 3167, CHATSWORTH, CA 91313-3167
PO BOX 3168, CHATSWORTH, CA 91313-3168
PO BOX 3169, CHATSWORTH, CA 91313-3169
PO BOX 3170, CHATSWORTH, CA 91313-3170
PO BOX 3171, CHATSWORTH, CA 91313-3171
PO BOX 3172, CHATSWORTH, CA 91313-3172
PO BOX 3173, CHATSWORTH, CA 91313-3173
PO BOX 3174, CHATSWORTH, CA 91313-3174
PO BOX 3175, CHATSWORTH, CA 91313-3175
PO BOX 3176, CHATSWORTH, CA 91313-3176
PO BOX 3177, CHATSWORTH, CA 91313-3177
PO BOX 3178, CHATSWORTH, CA 91313-3178
PO BOX 3179, CHATSWORTH, CA 91313-3179
PO BOX 3180, CHATSWORTH, CA 91313-3180
PO BOX 3181, CHATSWORTH, CA 91313-3181
PO BOX 3182, CHATSWORTH, CA 91313-3182
PO BOX 3183, CHATSWORTH, CA 91313-3183
PO BOX 3184, CHATSWORTH, CA 91313-3184
PO BOX 3185, CHATSWORTH, CA 91313-3185
PO BOX 3186, CHATSWORTH, CA 91313-3186
PO BOX 3187, CHATSWORTH, CA 91313-3187
PO BOX 3188, CHATSWORTH, CA 91313-3188
PO BOX 3189, CHATSWORTH, CA 91313-3189
PO BOX 3190, CHATSWORTH, CA 91313-3190
PO BOX 3191, CHATSWORTH, CA 91313-3191
PO BOX 3192, CHATSWORTH, CA 91313-3192
PO BOX 3193, CHATSWORTH, CA 91313-3193
PO BOX 3194, CHATSWORTH, CA 91313-3194
PO BOX 3195, CHATSWORTH, CA 91313-3195
PO BOX 3196, CHATSWORTH, CA 91313-3196
PO BOX 3197, CHATSWORTH, CA 91313-3197
PO BOX 3198, CHATSWORTH, CA 91313-3198
PO BOX 3199, CHATSWORTH, CA 91313-3199
PO BOX 3200, CHATSWORTH, CA 91313-3200
PO BOX 3201, CHATSWORTH, CA 91313-3201
PO BOX 3202, CHATSWORTH, CA 91313-3202
PO BOX 3203, CHATSWORTH, CA 91313-3203
PO BOX 3204, CHATSWORTH, CA 91313-3204
PO BOX 3205, CHATSWORTH, CA 91313-3205
PO BOX 3206, CHATSWORTH, CA 91313-3206
PO BOX 3207, CHATSWORTH, CA 91313-3207
PO BOX 3208, CHATSWORTH, CA 91313-3208
PO BOX 3209, CHATSWORTH, CA 91313-3209
PO BOX 3210, CHATSWORTH, CA 91313-3210
PO BOX 3211, CHATSWORTH, CA 91313-3211
PO BOX 3212, CHATSWORTH, CA 91313-3212
PO BOX 3213, CHATSWORTH, CA 91313-3213
PO BOX 3214, CHATSWORTH, CA 91313-3214
PO BOX 3215, CHATSWORTH, CA 91313-3215
PO BOX 3216, CHATSWORTH, CA 91313-3216
PO BOX 3217, CHATSWORTH, CA 91313-3217
PO BOX 3218, CHATSWORTH, CA 91313-3218
PO BOX 3219, CHATSWORTH, CA 91313-3219
PO BOX 3220, CHATSWORTH, CA 91313-3220
PO BOX 3221, CHATSWORTH, CA 91313-3221
PO BOX 3222, CHATSWORTH, CA 91313-3222
PO BOX 3223, CHATSWORTH, CA 91313-3223
PO BOX 3224, CHATSWORTH, CA 91313-3224
PO BOX 3225, CHATSWORTH, CA 91313-3225
PO BOX 3226, CHATSWORTH, CA 91313-3226
PO BOX 3227, CHATSWORTH, CA 91313-3227
PO BOX 3228, CHATSWORTH, CA 91313-3228
PO BOX 3229, CHATSWORTH, CA 91313-3229
PO BOX 3230, CHATSWORTH, CA 91313-3230
PO BOX 3231, CHATSWORTH, CA 91313-3231
PO BOX 3232, CHATSWORTH, CA 91313-3232
PO BOX 3233, CHATSWORTH, CA 91313-3233
PO BOX 3234, CHATSWORTH, CA 91313-3234
PO BOX 3235, CHATSWORTH, CA 91313-3235
PO BOX 3236, CHATSWORTH, CA 91313-3236
PO BOX 3237, CHATSWORTH, CA 91313-3237
PO BOX 3238, CHATSWORTH, CA 91313-3238
PO BOX 3239, CHATSWORTH, CA 91313-3239
PO BOX 3240, CHATSWORTH, CA 91313-3240
PO BOX 3241, CHATSWORTH, CA 91313-3241
PO BOX 3242, CHATSWORTH, CA 91313-3242
PO BOX 3243, CHATSWORTH, CA 91313-3243
PO BOX 3244, CHATSWORTH, CA 91313-3244
PO BOX 3245, CHATSWORTH, CA 91313-3245
PO BOX 3246, CHATSWORTH, CA 91313-3246
PO BOX 3247, CHATSWORTH, CA 91313-3247
PO BOX 3248, CHATSWORTH, CA 91313-3248
PO BOX 3249, CHATSWORTH, CA 91313-3249
PO BOX 3250, CHATSWORTH, CA 91313-3250
PO BOX 3251, CHATSWORTH, CA 91313-3251
PO BOX 3252, CHATSWORTH, CA 91313-3252
PO BOX 3253, CHATSWORTH, CA 91313-3253
PO BOX 3254, CHATSWORTH, CA 91313-3254
PO BOX 3255, CHATSWORTH, CA 91313-3255
PO BOX 3256, CHATSWORTH, CA 91313-3256
PO BOX 3257, CHATSWORTH, CA 91313-3257
PO BOX 3258, CHATSWORTH, CA 91313-3258
PO BOX 3259, CHATSWORTH, CA 91313-3259
PO BOX 3260, CHATSWORTH, CA 91313-3260
PO BOX 3261, CHATSWORTH, CA 91313-3261
PO BOX 3262, CHATSWORTH, CA 91313-3262
PO BOX 3263, CHATSWORTH, CA 91313-3263
PO BOX 3264, CHATSWORTH, CA 91313-3264
PO BOX 3265, CHATSWORTH, CA 91313-3265
PO BOX 3266, CHATSWORTH, CA 91313-3266
PO BOX 3267, CHATSWORTH, CA 91313-3267
PO BOX 3268, CHATSWORTH, CA 91313-3268
PO BOX 3269, CHATSWORTH, CA 91313-3269
PO BOX 3270, CHATSWORTH, CA 91313-3270
PO BOX 3271, CHATSWORTH, CA 91313-3271
PO BOX 3272, CHATSWORTH, CA 91313-3272
PO BOX 3273, CHATSWORTH, CA 91313-3273
PO BOX 3274, CHATSWORTH, CA 91313-3274
PO BOX 3275, CHATSWORTH, CA 91313-3275
PO BOX 3276, CHATSWORTH, CA 91313-3276
PO BOX 3277, CHATSWORTH, CA 91313-3277
PO BOX 3278, CHATSWORTH, CA 91313-3278
PO BOX 3279, CHATSWORTH, CA 91313-3279
PO BOX 3280, CHATSWORTH, CA 91313-3280
PO BOX 3281, CHATSWORTH, CA 91313-3281
PO BOX 3282, CHATSWORTH, CA 91313-3282
PO BOX 3283, CHATSWORTH, CA 91313-3283
PO BOX 3284, CHATSWORTH, CA 91313-3284
PO BOX 3285, CHATSWORTH, CA 91313-3285
PO BOX 3286, CHATSWORTH, CA 91313-3286
PO BOX 3287, CHATSWORTH, CA 91313-3287
PO BOX 3288, CHATSWORTH, CA 91313-3288
PO BOX 3289, CHATSWORTH, CA 91313-3289
PO BOX 3290, CHATSWORTH, CA 91313-3290
PO BOX 3291, CHATSWORTH, CA 91313-3291
PO BOX 3292, CHATSWORTH, CA 91313-3292
PO BOX 3293, CHATSWORTH, CA 91313-3293
PO BOX 3294, CHATSWORTH, CA 91313-3294
PO BOX 3295, CHATSWORTH, CA 91313-3295
PO BOX 3296, CHATSWORTH, CA 91313-3296
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