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 3001, IDAHO FALLS, ID 83403-3001
PO BOX 3002, IDAHO FALLS, ID 83403-3002
PO BOX 3003, IDAHO FALLS, ID 83403-3003
PO BOX 3004, IDAHO FALLS, ID 83403-3004
PO BOX 3005, IDAHO FALLS, ID 83403-3005
PO BOX 3006, IDAHO FALLS, ID 83403-3006
PO BOX 3007, IDAHO FALLS, ID 83403-3007
PO BOX 3008, IDAHO FALLS, ID 83403-3008
PO BOX 3009, IDAHO FALLS, ID 83403-3009
PO BOX 3010, IDAHO FALLS, ID 83403-3010
PO BOX 3011, IDAHO FALLS, ID 83403-3011
PO BOX 3012, IDAHO FALLS, ID 83403-3012
PO BOX 3013, IDAHO FALLS, ID 83403-3013
PO BOX 3014, IDAHO FALLS, ID 83403-3014
PO BOX 3015, IDAHO FALLS, ID 83403-3015
PO BOX 3016, IDAHO FALLS, ID 83403-3016
PO BOX 3017, IDAHO FALLS, ID 83403-3017
PO BOX 3018, IDAHO FALLS, ID 83403-3018
PO BOX 3019, IDAHO FALLS, ID 83403-3019
PO BOX 3020, IDAHO FALLS, ID 83403-3020
PO BOX 3021, IDAHO FALLS, ID 83403-3021
PO BOX 3022, IDAHO FALLS, ID 83403-3022
PO BOX 3023, IDAHO FALLS, ID 83403-3023
PO BOX 3024, IDAHO FALLS, ID 83403-3024
PO BOX 3025, IDAHO FALLS, ID 83403-3025
PO BOX 3026, IDAHO FALLS, ID 83403-3026
PO BOX 3027, IDAHO FALLS, ID 83403-3027
PO BOX 3028, IDAHO FALLS, ID 83403-3028
PO BOX 3029, IDAHO FALLS, ID 83403-3029
PO BOX 3030, IDAHO FALLS, ID 83403-3030
PO BOX 3031, IDAHO FALLS, ID 83403-3031
PO BOX 3032, IDAHO FALLS, ID 83403-3032
PO BOX 3033, IDAHO FALLS, ID 83403-3033
PO BOX 3034, IDAHO FALLS, ID 83403-3034
PO BOX 3035, IDAHO FALLS, ID 83403-3035
PO BOX 3036, IDAHO FALLS, ID 83403-3036
PO BOX 3037, IDAHO FALLS, ID 83403-3037
PO BOX 3038, IDAHO FALLS, ID 83403-3038
PO BOX 3039, IDAHO FALLS, ID 83403-3039
PO BOX 3040, IDAHO FALLS, ID 83403-3040
PO BOX 3041, IDAHO FALLS, ID 83403-3041
PO BOX 3042, IDAHO FALLS, ID 83403-3042
PO BOX 3043, IDAHO FALLS, ID 83403-3043
PO BOX 3044, IDAHO FALLS, ID 83403-3044
PO BOX 3045, IDAHO FALLS, ID 83403-3045
PO BOX 3046, IDAHO FALLS, ID 83403-3046
PO BOX 3047, IDAHO FALLS, ID 83403-3047
PO BOX 3048, IDAHO FALLS, ID 83403-3048
PO BOX 3049, IDAHO FALLS, ID 83403-3049
PO BOX 3050, IDAHO FALLS, ID 83403-3050
PO BOX 3051, IDAHO FALLS, ID 83403-3051
PO BOX 3052, IDAHO FALLS, ID 83403-3052
PO BOX 3053, IDAHO FALLS, ID 83403-3053
PO BOX 3054, IDAHO FALLS, ID 83403-3054
PO BOX 3055, IDAHO FALLS, ID 83403-3055
PO BOX 3056, IDAHO FALLS, ID 83403-3056
PO BOX 3057, IDAHO FALLS, ID 83403-3057
PO BOX 3058, IDAHO FALLS, ID 83403-3058
PO BOX 3059, IDAHO FALLS, ID 83403-3059
PO BOX 3060, IDAHO FALLS, ID 83403-3060
PO BOX 3061, IDAHO FALLS, ID 83403-3061
PO BOX 3062, IDAHO FALLS, ID 83403-3062
PO BOX 3063, IDAHO FALLS, ID 83403-3063
PO BOX 3064, IDAHO FALLS, ID 83403-3064
PO BOX 3065, IDAHO FALLS, ID 83403-3065
PO BOX 3066, IDAHO FALLS, ID 83403-3066
PO BOX 3067, IDAHO FALLS, ID 83403-3067
PO BOX 3068, IDAHO FALLS, ID 83403-3068
PO BOX 3069, IDAHO FALLS, ID 83403-3069
PO BOX 3070, IDAHO FALLS, ID 83403-3070
PO BOX 3071, IDAHO FALLS, ID 83403-3071
PO BOX 3072, IDAHO FALLS, ID 83403-3072
PO BOX 3073, IDAHO FALLS, ID 83403-3073
PO BOX 3074, IDAHO FALLS, ID 83403-3074
PO BOX 3075, IDAHO FALLS, ID 83403-3075
PO BOX 3076, IDAHO FALLS, ID 83403-3076
PO BOX 3077, IDAHO FALLS, ID 83403-3077
PO BOX 3078, IDAHO FALLS, ID 83403-3078
PO BOX 3079, IDAHO FALLS, ID 83403-3079
PO BOX 3080, IDAHO FALLS, ID 83403-3080
PO BOX 3081, IDAHO FALLS, ID 83403-3081
PO BOX 3082, IDAHO FALLS, ID 83403-3082
PO BOX 3083, IDAHO FALLS, ID 83403-3083
PO BOX 3084, IDAHO FALLS, ID 83403-3084
PO BOX 3085, IDAHO FALLS, ID 83403-3085
PO BOX 3086, IDAHO FALLS, ID 83403-3086
PO BOX 3087, IDAHO FALLS, ID 83403-3087
PO BOX 3088, IDAHO FALLS, ID 83403-3088
PO BOX 3089, IDAHO FALLS, ID 83403-3089
PO BOX 3090, IDAHO FALLS, ID 83403-3090
PO BOX 3091, IDAHO FALLS, ID 83403-3091
PO BOX 3092, IDAHO FALLS, ID 83403-3092
PO BOX 3093, IDAHO FALLS, ID 83403-3093
PO BOX 3094, IDAHO FALLS, ID 83403-3094
PO BOX 3095, IDAHO FALLS, ID 83403-3095
PO BOX 3096, IDAHO FALLS, ID 83403-3096
PO BOX 3097, IDAHO FALLS, ID 83403-3097
PO BOX 3098, IDAHO FALLS, ID 83403-3098
PO BOX 3099, IDAHO FALLS, ID 83403-3099
PO BOX 3100, IDAHO FALLS, ID 83403-3100
PO BOX 3101, IDAHO FALLS, ID 83403-3101
PO BOX 3102, IDAHO FALLS, ID 83403-3102
PO BOX 3103, IDAHO FALLS, ID 83403-3103
PO BOX 3104, IDAHO FALLS, ID 83403-3104
PO BOX 3105, IDAHO FALLS, ID 83403-3105
PO BOX 3106, IDAHO FALLS, ID 83403-3106
PO BOX 3107, IDAHO FALLS, ID 83403-3107
PO BOX 3108, IDAHO FALLS, ID 83403-3108
PO BOX 3109, IDAHO FALLS, ID 83403-3109
PO BOX 3110, IDAHO FALLS, ID 83403-3110
PO BOX 3111, IDAHO FALLS, ID 83403-3111
PO BOX 3112, IDAHO FALLS, ID 83403-3112
PO BOX 3113, IDAHO FALLS, ID 83403-3113
PO BOX 3114, IDAHO FALLS, ID 83403-3114
PO BOX 3115, IDAHO FALLS, ID 83403-3115
PO BOX 3116, IDAHO FALLS, ID 83403-3116
PO BOX 3117, IDAHO FALLS, ID 83403-3117
PO BOX 3118, IDAHO FALLS, ID 83403-3118
PO BOX 3119, IDAHO FALLS, ID 83403-3119
PO BOX 3120, IDAHO FALLS, ID 83403-3120
PO BOX 3121, IDAHO FALLS, ID 83403-3121
PO BOX 3122, IDAHO FALLS, ID 83403-3122
PO BOX 3123, IDAHO FALLS, ID 83403-3123
PO BOX 3124, IDAHO FALLS, ID 83403-3124
PO BOX 3125, IDAHO FALLS, ID 83403-3125
PO BOX 3126, IDAHO FALLS, ID 83403-3126
PO BOX 3127, IDAHO FALLS, ID 83403-3127
PO BOX 3128, IDAHO FALLS, ID 83403-3128
PO BOX 3129, IDAHO FALLS, ID 83403-3129
PO BOX 3130, IDAHO FALLS, ID 83403-3130
PO BOX 3131, IDAHO FALLS, ID 83403-3131
PO BOX 3132, IDAHO FALLS, ID 83403-3132
PO BOX 3133, IDAHO FALLS, ID 83403-3133
PO BOX 3134, IDAHO FALLS, ID 83403-3134
PO BOX 3135, IDAHO FALLS, ID 83403-3135
PO BOX 3136, IDAHO FALLS, ID 83403-3136
PO BOX 3137, IDAHO FALLS, ID 83403-3137
PO BOX 3138, IDAHO FALLS, ID 83403-3138
PO BOX 3139, IDAHO FALLS, ID 83403-3139
PO BOX 3140, IDAHO FALLS, ID 83403-3140
PO BOX 3141, IDAHO FALLS, ID 83403-3141
PO BOX 3142, IDAHO FALLS, ID 83403-3142
PO BOX 3143, IDAHO FALLS, ID 83403-3143
PO BOX 3144, IDAHO FALLS, ID 83403-3144
PO BOX 3145, IDAHO FALLS, ID 83403-3145
PO BOX 3146, IDAHO FALLS, ID 83403-3146
PO BOX 3147, IDAHO FALLS, ID 83403-3147
PO BOX 3148, IDAHO FALLS, ID 83403-3148
PO BOX 3149, IDAHO FALLS, ID 83403-3149
PO BOX 3150, IDAHO FALLS, ID 83403-3150
PO BOX 3151, IDAHO FALLS, ID 83403-3151
PO BOX 3152, IDAHO FALLS, ID 83403-3152
PO BOX 3153, IDAHO FALLS, ID 83403-3153
PO BOX 3154, IDAHO FALLS, ID 83403-3154
PO BOX 3155, IDAHO FALLS, ID 83403-3155
PO BOX 3156, IDAHO FALLS, ID 83403-3156
PO BOX 3157, IDAHO FALLS, ID 83403-3157
PO BOX 3158, IDAHO FALLS, ID 83403-3158
PO BOX 3159, IDAHO FALLS, ID 83403-3159
PO BOX 3160, IDAHO FALLS, ID 83403-3160
PO BOX 3161, IDAHO FALLS, ID 83403-3161
PO BOX 3162, IDAHO FALLS, ID 83403-3162
PO BOX 3163, IDAHO FALLS, ID 83403-3163
PO BOX 3164, IDAHO FALLS, ID 83403-3164
PO BOX 3165, IDAHO FALLS, ID 83403-3165
PO BOX 3166, IDAHO FALLS, ID 83403-3166
PO BOX 3167, IDAHO FALLS, ID 83403-3167
PO BOX 3168, IDAHO FALLS, ID 83403-3168
PO BOX 3169, IDAHO FALLS, ID 83403-3169
PO BOX 3170, IDAHO FALLS, ID 83403-3170
PO BOX 3171, IDAHO FALLS, ID 83403-3171
PO BOX 3172, IDAHO FALLS, ID 83403-3172
PO BOX 3173, IDAHO FALLS, ID 83403-3173
PO BOX 3174, IDAHO FALLS, ID 83403-3174
PO BOX 3175, IDAHO FALLS, ID 83403-3175
PO BOX 3176, IDAHO FALLS, ID 83403-3176
PO BOX 3177, IDAHO FALLS, ID 83403-3177
PO BOX 3178, IDAHO FALLS, ID 83403-3178
PO BOX 3179, IDAHO FALLS, ID 83403-3179
PO BOX 3180, IDAHO FALLS, ID 83403-3180
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