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 230015, PITTSBURGH, PA 15251-3015
PO BOX 230016, PITTSBURGH, PA 15251-3016
PO BOX 230017, PITTSBURGH, PA 15251-3017
PO BOX 230018, PITTSBURGH, PA 15251-3018
PO BOX 230019, PITTSBURGH, PA 15251-3019
PO BOX 230020, PITTSBURGH, PA 15251-3020
PO BOX 230021, PITTSBURGH, PA 15251-3021
PO BOX 230022, PITTSBURGH, PA 15251-3022
PO BOX 230023, PITTSBURGH, PA 15251-3023
PO BOX 230024, PITTSBURGH, PA 15251-3024
PO BOX 230025, PITTSBURGH, PA 15251-3025
PO BOX 230026, PITTSBURGH, PA 15251-3026
PO BOX 230027, PITTSBURGH, PA 15251-3027
PO BOX 230028, PITTSBURGH, PA 15251-3028
PO BOX 230029, PITTSBURGH, PA 15251-3029
PO BOX 230030, PITTSBURGH, PA 15251-3030
PO BOX 230031, PITTSBURGH, PA 15251-3031
PO BOX 230032, PITTSBURGH, PA 15251-3032
PO BOX 230033, PITTSBURGH, PA 15251-3033
PO BOX 230034, PITTSBURGH, PA 15251-3034
PO BOX 230035, PITTSBURGH, PA 15251-3035
PO BOX 230036, PITTSBURGH, PA 15251-3036
PO BOX 230037, PITTSBURGH, PA 15251-3037
PO BOX 230038, PITTSBURGH, PA 15251-3038
PO BOX 230039, PITTSBURGH, PA 15251-3039
PO BOX 230040, PITTSBURGH, PA 15251-3040
PO BOX 230041, PITTSBURGH, PA 15251-3041
PO BOX 230042, PITTSBURGH, PA 15251-3042
PO BOX 230043, PITTSBURGH, PA 15251-3043
PO BOX 230044, PITTSBURGH, PA 15251-3044
PO BOX 230045, PITTSBURGH, PA 15251-3045
PO BOX 230046, PITTSBURGH, PA 15251-3046
PO BOX 230047, PITTSBURGH, PA 15251-3047
PO BOX 230048, PITTSBURGH, PA 15251-3048
PO BOX 230049, PITTSBURGH, PA 15251-3049
PO BOX 230050, PITTSBURGH, PA 15251-3050
PO BOX 230051, PITTSBURGH, PA 15251-3051
PO BOX 230052, PITTSBURGH, PA 15251-3052
PO BOX 230053, PITTSBURGH, PA 15251-3053
PO BOX 230054, PITTSBURGH, PA 15251-3054
PO BOX 230055, PITTSBURGH, PA 15251-3055
PO BOX 230056, PITTSBURGH, PA 15251-3056
PO BOX 230057, PITTSBURGH, PA 15251-3057
PO BOX 230058, PITTSBURGH, PA 15251-3058
PO BOX 230059, PITTSBURGH, PA 15251-3059
PO BOX 230060, PITTSBURGH, PA 15251-3060
PO BOX 230061, PITTSBURGH, PA 15251-3061
PO BOX 230062, PITTSBURGH, PA 15251-3062
PO BOX 230063, PITTSBURGH, PA 15251-3063
PO BOX 230064, PITTSBURGH, PA 15251-3064
PO BOX 230065, PITTSBURGH, PA 15251-3065
PO BOX 230066, PITTSBURGH, PA 15251-3066
PO BOX 230067, PITTSBURGH, PA 15251-3067
PO BOX 230068, PITTSBURGH, PA 15251-3068
PO BOX 230069, PITTSBURGH, PA 15251-3069
PO BOX 230070, PITTSBURGH, PA 15251-3070
PO BOX 230071, PITTSBURGH, PA 15251-3071
PO BOX 230072, PITTSBURGH, PA 15251-3072
PO BOX 230073, PITTSBURGH, PA 15251-3073
PO BOX 230074, PITTSBURGH, PA 15251-3074
PO BOX 230075, PITTSBURGH, PA 15251-3075
PO BOX 230076, PITTSBURGH, PA 15251-3076
PO BOX 230077, PITTSBURGH, PA 15251-3077
PO BOX 230078, PITTSBURGH, PA 15251-3078
PO BOX 230079, PITTSBURGH, PA 15251-3079
PO BOX 230080, PITTSBURGH, PA 15251-3080
PO BOX 230081, PITTSBURGH, PA 15251-3081
PO BOX 230082, PITTSBURGH, PA 15251-3082
PO BOX 230083, PITTSBURGH, PA 15251-3083
PO BOX 230084, PITTSBURGH, PA 15251-3084
PO BOX 230085, PITTSBURGH, PA 15251-3085
PO BOX 230086, PITTSBURGH, PA 15251-3086
PO BOX 230087, PITTSBURGH, PA 15251-3087
PO BOX 230088, PITTSBURGH, PA 15251-3088
PO BOX 230089, PITTSBURGH, PA 15251-3089
PO BOX 230090, PITTSBURGH, PA 15251-3090
PO BOX 230091, PITTSBURGH, PA 15251-3091
PO BOX 230092, PITTSBURGH, PA 15251-3092
PO BOX 230093, PITTSBURGH, PA 15251-3093
PO BOX 230094, PITTSBURGH, PA 15251-3094
PO BOX 230095, PITTSBURGH, PA 15251-3095
PO BOX 230096, PITTSBURGH, PA 15251-3096
PO BOX 230097, PITTSBURGH, PA 15251-3097
PO BOX 230098, PITTSBURGH, PA 15251-3098
PO BOX 230099, PITTSBURGH, PA 15251-3099
PO BOX 230100, PITTSBURGH, PA 15251-3100
PO BOX 230101, PITTSBURGH, PA 15251-3101
PO BOX 230102, PITTSBURGH, PA 15251-3102
PO BOX 230103, PITTSBURGH, PA 15251-3103
PO BOX 230104, PITTSBURGH, PA 15251-3104
PO BOX 230105, PITTSBURGH, PA 15251-3105
PO BOX 230106, PITTSBURGH, PA 15251-3106
PO BOX 230107, PITTSBURGH, PA 15251-3107
PO BOX 230108, PITTSBURGH, PA 15251-3108
PO BOX 230109, PITTSBURGH, PA 15251-3109
PO BOX 230110, PITTSBURGH, PA 15251-3110
PO BOX 230111, PITTSBURGH, PA 15251-3111
PO BOX 230112, PITTSBURGH, PA 15251-3112
PO BOX 230113, PITTSBURGH, PA 15251-3113
PO BOX 230114, PITTSBURGH, PA 15251-3114
PO BOX 230115, PITTSBURGH, PA 15251-3115
PO BOX 230116, PITTSBURGH, PA 15251-3116
PO BOX 230117, PITTSBURGH, PA 15251-3117
PO BOX 230118, PITTSBURGH, PA 15251-3118
PO BOX 230119, PITTSBURGH, PA 15251-3119
PO BOX 230120, PITTSBURGH, PA 15251-3120
PO BOX 230121, PITTSBURGH, PA 15251-3121
PO BOX 230122, PITTSBURGH, PA 15251-3122
PO BOX 230123, PITTSBURGH, PA 15251-3123
PO BOX 230124, PITTSBURGH, PA 15251-3124
PO BOX 230125, PITTSBURGH, PA 15251-3125
PO BOX 230126, PITTSBURGH, PA 15251-3126
PO BOX 230127, PITTSBURGH, PA 15251-3127
PO BOX 230128, PITTSBURGH, PA 15251-3128
PO BOX 230129, PITTSBURGH, PA 15251-3129
PO BOX 230130, PITTSBURGH, PA 15251-3130
PO BOX 230131, PITTSBURGH, PA 15251-3131
PO BOX 230132, PITTSBURGH, PA 15251-3132
PO BOX 230133, PITTSBURGH, PA 15251-3133
PO BOX 230134, PITTSBURGH, PA 15251-3134
PO BOX 230135, PITTSBURGH, PA 15251-3135
PO BOX 230136, PITTSBURGH, PA 15251-3136
PO BOX 230137, PITTSBURGH, PA 15251-3137
PO BOX 230138, PITTSBURGH, PA 15251-3138
PO BOX 230139, PITTSBURGH, PA 15251-3139
PO BOX 230140, PITTSBURGH, PA 15251-3140
PO BOX 230141, PITTSBURGH, PA 15251-3141
PO BOX 230142, PITTSBURGH, PA 15251-3142
PO BOX 230143, PITTSBURGH, PA 15251-3143
PO BOX 230144, PITTSBURGH, PA 15251-3144
PO BOX 230145, PITTSBURGH, PA 15251-3145
PO BOX 230146, PITTSBURGH, PA 15251-3146
PO BOX 230147, PITTSBURGH, PA 15251-3147
PO BOX 230148, PITTSBURGH, PA 15251-3148
PO BOX 230149, PITTSBURGH, PA 15251-3149
PO BOX 230150, PITTSBURGH, PA 15251-3150
PO BOX 230151, PITTSBURGH, PA 15251-3151
PO BOX 230152, PITTSBURGH, PA 15251-3152
PO BOX 230153, PITTSBURGH, PA 15251-3153
PO BOX 230154, PITTSBURGH, PA 15251-3154
PO BOX 230155, PITTSBURGH, PA 15251-3155
PO BOX 230156, PITTSBURGH, PA 15251-3156
PO BOX 230157, PITTSBURGH, PA 15251-3157
PO BOX 230158, PITTSBURGH, PA 15251-3158
PO BOX 230159, PITTSBURGH, PA 15251-3159
PO BOX 230160, PITTSBURGH, PA 15251-3160
PO BOX 230161, PITTSBURGH, PA 15251-3161
PO BOX 230162, PITTSBURGH, PA 15251-3162
PO BOX 230163, PITTSBURGH, PA 15251-3163
PO BOX 230164, PITTSBURGH, PA 15251-3164
PO BOX 230165, PITTSBURGH, PA 15251-3165
PO BOX 230166, PITTSBURGH, PA 15251-3166
PO BOX 230167, PITTSBURGH, PA 15251-3167
PO BOX 230168, PITTSBURGH, PA 15251-3168
PO BOX 230169, PITTSBURGH, PA 15251-3169
PO BOX 230170, PITTSBURGH, PA 15251-3170
PO BOX 230171, PITTSBURGH, PA 15251-3171
PO BOX 230172, PITTSBURGH, PA 15251-3172
PO BOX 230173, PITTSBURGH, PA 15251-3173
PO BOX 230174, PITTSBURGH, PA 15251-3174
PO BOX 230175, PITTSBURGH, PA 15251-3175
PO BOX 230176, PITTSBURGH, PA 15251-3176
PO BOX 230177, PITTSBURGH, PA 15251-3177
PO BOX 230178, PITTSBURGH, PA 15251-3178
PO BOX 230179, PITTSBURGH, PA 15251-3179
PO BOX 230180, PITTSBURGH, PA 15251-3180
PO BOX 230181, PITTSBURGH, PA 15251-3181
PO BOX 230182, PITTSBURGH, PA 15251-3182
PO BOX 230183, PITTSBURGH, PA 15251-3183
PO BOX 230184, PITTSBURGH, PA 15251-3184
PO BOX 230185, PITTSBURGH, PA 15251-3185
PO BOX 230186, PITTSBURGH, PA 15251-3186
PO BOX 230187, PITTSBURGH, PA 15251-3187
PO BOX 230188, PITTSBURGH, PA 15251-3188
PO BOX 230189, PITTSBURGH, PA 15251-3189
PO BOX 230190, PITTSBURGH, PA 15251-3190
PO BOX 230191, PITTSBURGH, PA 15251-3191
PO BOX 230192, PITTSBURGH, PA 15251-3192
PO BOX 230193, PITTSBURGH, PA 15251-3193
PO BOX 230194, PITTSBURGH, PA 15251-3194
PO BOX 230195, PITTSBURGH, PA 15251-3195
PO BOX 230196, PITTSBURGH, PA 15251-3196
PO BOX 230197, PITTSBURGH, PA 15251-3197
PO BOX 230198, PITTSBURGH, PA 15251-3198
PO BOX 230199, PITTSBURGH, PA 15251-3199
PO BOX 230200, PITTSBURGH, PA 15251-3200
PO BOX 230201, PITTSBURGH, PA 15251-3201
PO BOX 230202, PITTSBURGH, PA 15251-3202
PO BOX 230203, PITTSBURGH, PA 15251-3203
PO BOX 230204, PITTSBURGH, PA 15251-3204
PO BOX 230205, PITTSBURGH, PA 15251-3205
PO BOX 230206, PITTSBURGH, PA 15251-3206
PO BOX 230207, PITTSBURGH, PA 15251-3207
PO BOX 230208, PITTSBURGH, PA 15251-3208
PO BOX 230209, PITTSBURGH, PA 15251-3209
PO BOX 230210, PITTSBURGH, PA 15251-3210
PO BOX 230211, PITTSBURGH, PA 15251-3211
PO BOX 230212, PITTSBURGH, PA 15251-3212
PO BOX 230213, PITTSBURGH, PA 15251-3213
PO BOX 230214, PITTSBURGH, PA 15251-3214
PO BOX 230215, PITTSBURGH, PA 15251-3215
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