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 203052, DALLAS, TX 75320-3052
PO BOX 203053, DALLAS, TX 75320-3053
PO BOX 203054, DALLAS, TX 75320-3054
PO BOX 203055, DALLAS, TX 75320-3055
PO BOX 203056, DALLAS, TX 75320-3056
PO BOX 203057, DALLAS, TX 75320-3057
PO BOX 203058, DALLAS, TX 75320-3058
PO BOX 203059, DALLAS, TX 75320-3059
PO BOX 203060, DALLAS, TX 75320-3060
PO BOX 203061, DALLAS, TX 75320-3061
PO BOX 203062, DALLAS, TX 75320-3062
PO BOX 203063, DALLAS, TX 75320-3063
PO BOX 203064, DALLAS, TX 75320-3064
PO BOX 203065, DALLAS, TX 75320-3065
PO BOX 203066, DALLAS, TX 75320-3066
PO BOX 203067, DALLAS, TX 75320-3067
PO BOX 203068, DALLAS, TX 75320-3068
PO BOX 203069, DALLAS, TX 75320-3069
PO BOX 203070, DALLAS, TX 75320-3070
PO BOX 203071, DALLAS, TX 75320-3071
PO BOX 203072, DALLAS, TX 75320-3072
PO BOX 203073, DALLAS, TX 75320-3073
PO BOX 203074, DALLAS, TX 75320-3074
PO BOX 203075, DALLAS, TX 75320-3075
PO BOX 203076, DALLAS, TX 75320-3076
PO BOX 203077, DALLAS, TX 75320-3077
PO BOX 203078, DALLAS, TX 75320-3078
PO BOX 203079, DALLAS, TX 75320-3079
PO BOX 203080, DALLAS, TX 75320-3080
PO BOX 203081, DALLAS, TX 75320-3081
PO BOX 203082, DALLAS, TX 75320-3082
PO BOX 203083, DALLAS, TX 75320-3083
PO BOX 203084, DALLAS, TX 75320-3084
PO BOX 203085, DALLAS, TX 75320-3085
PO BOX 203086, DALLAS, TX 75320-3086
PO BOX 203087, DALLAS, TX 75320-3087
PO BOX 203088, DALLAS, TX 75320-3088
PO BOX 203089, DALLAS, TX 75320-3089
PO BOX 203090, DALLAS, TX 75320-3090
PO BOX 203091, DALLAS, TX 75320-3091
PO BOX 203092, DALLAS, TX 75320-3092
PO BOX 203093, DALLAS, TX 75320-3093
PO BOX 203094, DALLAS, TX 75320-3094
PO BOX 203095, DALLAS, TX 75320-3095
PO BOX 203096, DALLAS, TX 75320-3096
PO BOX 203097, DALLAS, TX 75320-3097
PO BOX 203098, DALLAS, TX 75320-3098
PO BOX 203099, DALLAS, TX 75320-3099
PO BOX 203100, DALLAS, TX 75320-3100
PO BOX 203101, DALLAS, TX 75320-3101
PO BOX 203102, DALLAS, TX 75320-3102
PO BOX 203103, DALLAS, TX 75320-3103
PO BOX 203104, DALLAS, TX 75320-3104
PO BOX 203105, DALLAS, TX 75320-3105
PO BOX 203106, DALLAS, TX 75320-3106
PO BOX 203107, DALLAS, TX 75320-3107
PO BOX 203108, DALLAS, TX 75320-3108
PO BOX 203109, DALLAS, TX 75320-3109
PO BOX 203110, DALLAS, TX 75320-3110
PO BOX 203111, DALLAS, TX 75320-3111
PO BOX 203112, DALLAS, TX 75320-3112
PO BOX 203113, DALLAS, TX 75320-3113
PO BOX 203114, DALLAS, TX 75320-3114
PO BOX 203115, DALLAS, TX 75320-3115
PO BOX 203116, DALLAS, TX 75320-3116
PO BOX 203117, DALLAS, TX 75320-3117
PO BOX 203118, DALLAS, TX 75320-3118
PO BOX 203119, DALLAS, TX 75320-3119
PO BOX 203120, DALLAS, TX 75320-3120
PO BOX 203121, DALLAS, TX 75320-3121
PO BOX 203122, DALLAS, TX 75320-3122
PO BOX 203123, DALLAS, TX 75320-3123
PO BOX 203124, DALLAS, TX 75320-3124
PO BOX 203125, DALLAS, TX 75320-3125
PO BOX 203126, DALLAS, TX 75320-3126
PO BOX 203127, DALLAS, TX 75320-3127
PO BOX 203128, DALLAS, TX 75320-3128
PO BOX 203129, DALLAS, TX 75320-3129
PO BOX 203130, DALLAS, TX 75320-3130
PO BOX 203131, DALLAS, TX 75320-3131
PO BOX 203132, DALLAS, TX 75320-3132
PO BOX 203133, DALLAS, TX 75320-3133
PO BOX 203134, DALLAS, TX 75320-3134
PO BOX 203135, DALLAS, TX 75320-3135
PO BOX 203136, DALLAS, TX 75320-3136
PO BOX 203137, DALLAS, TX 75320-3137
PO BOX 203138, DALLAS, TX 75320-3138
PO BOX 203139, DALLAS, TX 75320-3139
PO BOX 203140, DALLAS, TX 75320-3140
PO BOX 203141, DALLAS, TX 75320-3141
PO BOX 203142, DALLAS, TX 75320-3142
PO BOX 203143, DALLAS, TX 75320-3143
PO BOX 203144, DALLAS, TX 75320-3144
PO BOX 203145, DALLAS, TX 75320-3145
PO BOX 203146, DALLAS, TX 75320-3146
PO BOX 203147, DALLAS, TX 75320-3147
PO BOX 203148, DALLAS, TX 75320-3148
PO BOX 203149, DALLAS, TX 75320-3149
PO BOX 203150, DALLAS, TX 75320-3150
PO BOX 203151, DALLAS, TX 75320-3151
PO BOX 203152, DALLAS, TX 75320-3152
PO BOX 203153, DALLAS, TX 75320-3153
PO BOX 203154, DALLAS, TX 75320-3154
PO BOX 203155, DALLAS, TX 75320-3155
PO BOX 203156, DALLAS, TX 75320-3156
PO BOX 203157, DALLAS, TX 75320-3157
PO BOX 203158, DALLAS, TX 75320-3158
PO BOX 203159, DALLAS, TX 75320-3159
PO BOX 203160, DALLAS, TX 75320-3160
PO BOX 203161, DALLAS, TX 75320-3161
PO BOX 203162, DALLAS, TX 75320-3162
PO BOX 203163, DALLAS, TX 75320-3163
PO BOX 203164, DALLAS, TX 75320-3164
PO BOX 203165, DALLAS, TX 75320-3165
PO BOX 203166, DALLAS, TX 75320-3166
PO BOX 203167, DALLAS, TX 75320-3167
PO BOX 203168, DALLAS, TX 75320-3168
PO BOX 203169, DALLAS, TX 75320-3169
PO BOX 203170, DALLAS, TX 75320-3170
PO BOX 203171, DALLAS, TX 75320-3171
PO BOX 203172, DALLAS, TX 75320-3172
PO BOX 203173, DALLAS, TX 75320-3173
PO BOX 203174, DALLAS, TX 75320-3174
PO BOX 203175, DALLAS, TX 75320-3175
PO BOX 203176, DALLAS, TX 75320-3176
PO BOX 203177, DALLAS, TX 75320-3177
PO BOX 203178, DALLAS, TX 75320-3178
PO BOX 203179, DALLAS, TX 75320-3179
PO BOX 203180, DALLAS, TX 75320-3180
PO BOX 203181, DALLAS, TX 75320-3181
PO BOX 203182, DALLAS, TX 75320-3182
PO BOX 203183, DALLAS, TX 75320-3183
PO BOX 203184, DALLAS, TX 75320-3184
PO BOX 203185, DALLAS, TX 75320-3185
PO BOX 203186, DALLAS, TX 75320-3186
PO BOX 203187, DALLAS, TX 75320-3187
PO BOX 203188, DALLAS, TX 75320-3188
PO BOX 203189, DALLAS, TX 75320-3189
PO BOX 203190, DALLAS, TX 75320-3190
PO BOX 203191, DALLAS, TX 75320-3191
PO BOX 203192, DALLAS, TX 75320-3192
PO BOX 203193, DALLAS, TX 75320-3193
PO BOX 203194, DALLAS, TX 75320-3194
PO BOX 203195, DALLAS, TX 75320-3195
PO BOX 203196, DALLAS, TX 75320-3196
PO BOX 203197, DALLAS, TX 75320-3197
PO BOX 203198, DALLAS, TX 75320-3198
PO BOX 203199, DALLAS, TX 75320-3199
PO BOX 203200, DALLAS, TX 75320-3200
PO BOX 203201, DALLAS, TX 75320-3201
PO BOX 203202, DALLAS, TX 75320-3202
PO BOX 203203, DALLAS, TX 75320-3203
PO BOX 203204, DALLAS, TX 75320-3204
PO BOX 203205, DALLAS, TX 75320-3205
PO BOX 203206, DALLAS, TX 75320-3206
PO BOX 203207, DALLAS, TX 75320-3207
PO BOX 203208, DALLAS, TX 75320-3208
PO BOX 203209, DALLAS, TX 75320-3209
PO BOX 203210, DALLAS, TX 75320-3210
PO BOX 203211, DALLAS, TX 75320-3211
PO BOX 203212, DALLAS, TX 75320-3212
PO BOX 203213, DALLAS, TX 75320-3213
PO BOX 203214, DALLAS, TX 75320-3214
PO BOX 203215, DALLAS, TX 75320-3215
PO BOX 203216, DALLAS, TX 75320-3216
PO BOX 203217, DALLAS, TX 75320-3217
PO BOX 203218, DALLAS, TX 75320-3218
PO BOX 203219, DALLAS, TX 75320-3219
PO BOX 203220, DALLAS, TX 75320-3220
PO BOX 203221, DALLAS, TX 75320-3221
PO BOX 203222, DALLAS, TX 75320-3222
PO BOX 203223, DALLAS, TX 75320-3223
PO BOX 203224, DALLAS, TX 75320-3224
PO BOX 203225, DALLAS, TX 75320-3225
PO BOX 203226, DALLAS, TX 75320-3226
PO BOX 203227, DALLAS, TX 75320-3227
PO BOX 203228, DALLAS, TX 75320-3228
PO BOX 203229, DALLAS, TX 75320-3229
PO BOX 203230, DALLAS, TX 75320-3230
PO BOX 203231, DALLAS, TX 75320-3231
PO BOX 203232, DALLAS, TX 75320-3232
PO BOX 203233, DALLAS, TX 75320-3233
PO BOX 203234, DALLAS, TX 75320-3234
PO BOX 203235, DALLAS, TX 75320-3235
PO BOX 203236, DALLAS, TX 75320-3236
PO BOX 203237, DALLAS, TX 75320-3237
PO BOX 203238, DALLAS, TX 75320-3238
PO BOX 203239, DALLAS, TX 75320-3239
PO BOX 203240, DALLAS, TX 75320-3240
PO BOX 203241, DALLAS, TX 75320-3241
PO BOX 203242, DALLAS, TX 75320-3242
PO BOX 203243, DALLAS, TX 75320-3243
PO BOX 203244, DALLAS, TX 75320-3244
PO BOX 203245, DALLAS, TX 75320-3245
PO BOX 203246, DALLAS, TX 75320-3246
PO BOX 203247, DALLAS, TX 75320-3247
PO BOX 203248, DALLAS, TX 75320-3248
PO BOX 203249, DALLAS, TX 75320-3249
PO BOX 203250, DALLAS, TX 75320-3250
PO BOX 203251, DALLAS, TX 75320-3251
PO BOX 203252, DALLAS, TX 75320-3252
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