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, HUNTINGTON BEACH, CA 92605-3121
PO BOX 3122, HUNTINGTON BEACH, CA 92605-3122
PO BOX 3123, HUNTINGTON BEACH, CA 92605-3123
PO BOX 3124, HUNTINGTON BEACH, CA 92605-3124
PO BOX 3125, HUNTINGTON BEACH, CA 92605-3125
PO BOX 3126, HUNTINGTON BEACH, CA 92605-3126
PO BOX 3127, HUNTINGTON BEACH, CA 92605-3127
PO BOX 3128, HUNTINGTON BEACH, CA 92605-3128
PO BOX 3129, HUNTINGTON BEACH, CA 92605-3129
PO BOX 3130, HUNTINGTON BEACH, CA 92605-3130
PO BOX 3131, HUNTINGTON BEACH, CA 92605-3131
PO BOX 3132, HUNTINGTON BEACH, CA 92605-3132
PO BOX 3133, HUNTINGTON BEACH, CA 92605-3133
PO BOX 3134, HUNTINGTON BEACH, CA 92605-3134
PO BOX 3135, HUNTINGTON BEACH, CA 92605-3135
PO BOX 3136, HUNTINGTON BEACH, CA 92605-3136
PO BOX 3137, HUNTINGTON BEACH, CA 92605-3137
PO BOX 3138, HUNTINGTON BEACH, CA 92605-3138
PO BOX 3139, HUNTINGTON BEACH, CA 92605-3139
PO BOX 3140, HUNTINGTON BEACH, CA 92605-3140
PO BOX 3141, HUNTINGTON BEACH, CA 92605-3141
PO BOX 3142, HUNTINGTON BEACH, CA 92605-3142
PO BOX 3143, HUNTINGTON BEACH, CA 92605-3143
PO BOX 3144, HUNTINGTON BEACH, CA 92605-3144
PO BOX 3145, HUNTINGTON BEACH, CA 92605-3145
PO BOX 3146, HUNTINGTON BEACH, CA 92605-3146
PO BOX 3147, HUNTINGTON BEACH, CA 92605-3147
PO BOX 3148, HUNTINGTON BEACH, CA 92605-3148
PO BOX 3149, HUNTINGTON BEACH, CA 92605-3149
PO BOX 3150, HUNTINGTON BEACH, CA 92605-3150
PO BOX 3151, HUNTINGTON BEACH, CA 92605-3151
PO BOX 3152, HUNTINGTON BEACH, CA 92605-3152
PO BOX 3153, HUNTINGTON BEACH, CA 92605-3153
PO BOX 3154, HUNTINGTON BEACH, CA 92605-3154
PO BOX 3155, HUNTINGTON BEACH, CA 92605-3155
PO BOX 3156, HUNTINGTON BEACH, CA 92605-3156
PO BOX 3157, HUNTINGTON BEACH, CA 92605-3157
PO BOX 3158, HUNTINGTON BEACH, CA 92605-3158
PO BOX 3159, HUNTINGTON BEACH, CA 92605-3159
PO BOX 3160, HUNTINGTON BEACH, CA 92605-3160
PO BOX 3161, HUNTINGTON BEACH, CA 92605-3161
PO BOX 3162, HUNTINGTON BEACH, CA 92605-3162
PO BOX 3163, HUNTINGTON BEACH, CA 92605-3163
PO BOX 3164, HUNTINGTON BEACH, CA 92605-3164
PO BOX 3165, HUNTINGTON BEACH, CA 92605-3165
PO BOX 3166, HUNTINGTON BEACH, CA 92605-3166
PO BOX 3167, HUNTINGTON BEACH, CA 92605-3167
PO BOX 3168, HUNTINGTON BEACH, CA 92605-3168
PO BOX 3169, HUNTINGTON BEACH, CA 92605-3169
PO BOX 3170, HUNTINGTON BEACH, CA 92605-3170
PO BOX 3171, HUNTINGTON BEACH, CA 92605-3171
PO BOX 3172, HUNTINGTON BEACH, CA 92605-3172
PO BOX 3173, HUNTINGTON BEACH, CA 92605-3173
PO BOX 3174, HUNTINGTON BEACH, CA 92605-3174
PO BOX 3175, HUNTINGTON BEACH, CA 92605-3175
PO BOX 3176, HUNTINGTON BEACH, CA 92605-3176
PO BOX 3177, HUNTINGTON BEACH, CA 92605-3177
PO BOX 3178, HUNTINGTON BEACH, CA 92605-3178
PO BOX 3179, HUNTINGTON BEACH, CA 92605-3179
PO BOX 3180, HUNTINGTON BEACH, CA 92605-3180
PO BOX 3181, HUNTINGTON BEACH, CA 92605-3181
PO BOX 3182, HUNTINGTON BEACH, CA 92605-3182
PO BOX 3183, HUNTINGTON BEACH, CA 92605-3183
PO BOX 3184, HUNTINGTON BEACH, CA 92605-3184
PO BOX 3185, HUNTINGTON BEACH, CA 92605-3185
PO BOX 3186, HUNTINGTON BEACH, CA 92605-3186
PO BOX 3187, HUNTINGTON BEACH, CA 92605-3187
PO BOX 3188, HUNTINGTON BEACH, CA 92605-3188
PO BOX 3189, HUNTINGTON BEACH, CA 92605-3189
PO BOX 3190, HUNTINGTON BEACH, CA 92605-3190
PO BOX 3191, HUNTINGTON BEACH, CA 92605-3191
PO BOX 3192, HUNTINGTON BEACH, CA 92605-3192
PO BOX 3193, HUNTINGTON BEACH, CA 92605-3193
PO BOX 3194, HUNTINGTON BEACH, CA 92605-3194
PO BOX 3195, HUNTINGTON BEACH, CA 92605-3195
PO BOX 3196, HUNTINGTON BEACH, CA 92605-3196
PO BOX 3197, HUNTINGTON BEACH, CA 92605-3197
PO BOX 3198, HUNTINGTON BEACH, CA 92605-3198
PO BOX 3199, HUNTINGTON BEACH, CA 92605-3199
PO BOX 3200, HUNTINGTON BEACH, CA 92605-3200
PO BOX 3201, HUNTINGTON BEACH, CA 92605-3201
PO BOX 3202, HUNTINGTON BEACH, CA 92605-3202
PO BOX 3203, HUNTINGTON BEACH, CA 92605-3203
PO BOX 3204, HUNTINGTON BEACH, CA 92605-3204
PO BOX 3205, HUNTINGTON BEACH, CA 92605-3205
PO BOX 3206, HUNTINGTON BEACH, CA 92605-3206
PO BOX 3207, HUNTINGTON BEACH, CA 92605-3207
PO BOX 3208, HUNTINGTON BEACH, CA 92605-3208
PO BOX 3209, HUNTINGTON BEACH, CA 92605-3209
PO BOX 3210, HUNTINGTON BEACH, CA 92605-3210
PO BOX 3211, HUNTINGTON BEACH, CA 92605-3211
PO BOX 3212, HUNTINGTON BEACH, CA 92605-3212
PO BOX 3213, HUNTINGTON BEACH, CA 92605-3213
PO BOX 3214, HUNTINGTON BEACH, CA 92605-3214
PO BOX 3215, HUNTINGTON BEACH, CA 92605-3215
PO BOX 3216, HUNTINGTON BEACH, CA 92605-3216
PO BOX 3217, HUNTINGTON BEACH, CA 92605-3217
PO BOX 3218, HUNTINGTON BEACH, CA 92605-3218
PO BOX 3219, HUNTINGTON BEACH, CA 92605-3219
PO BOX 3220, HUNTINGTON BEACH, CA 92605-3220
PO BOX 3221, HUNTINGTON BEACH, CA 92605-3221
PO BOX 3222, HUNTINGTON BEACH, CA 92605-3222
PO BOX 3223, HUNTINGTON BEACH, CA 92605-3223
PO BOX 3224, HUNTINGTON BEACH, CA 92605-3224
PO BOX 3225, HUNTINGTON BEACH, CA 92605-3225
PO BOX 3226, HUNTINGTON BEACH, CA 92605-3226
PO BOX 3227, HUNTINGTON BEACH, CA 92605-3227
PO BOX 3228, HUNTINGTON BEACH, CA 92605-3228
PO BOX 3229, HUNTINGTON BEACH, CA 92605-3229
PO BOX 3230, HUNTINGTON BEACH, CA 92605-3230
PO BOX 3231, HUNTINGTON BEACH, CA 92605-3231
PO BOX 3232, HUNTINGTON BEACH, CA 92605-3232
PO BOX 3233, HUNTINGTON BEACH, CA 92605-3233
PO BOX 3234, HUNTINGTON BEACH, CA 92605-3234
PO BOX 3235, HUNTINGTON BEACH, CA 92605-3235
PO BOX 3236, HUNTINGTON BEACH, CA 92605-3236
PO BOX 3237, HUNTINGTON BEACH, CA 92605-3237
PO BOX 3238, HUNTINGTON BEACH, CA 92605-3238
PO BOX 3239, HUNTINGTON BEACH, CA 92605-3239
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