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, SPRINGFIELD, MO 65808-3001
PO BOX 3002, SPRINGFIELD, MO 65808-3002
PO BOX 3003, SPRINGFIELD, MO 65808-3003
PO BOX 3004, SPRINGFIELD, MO 65808-3004
PO BOX 3005, SPRINGFIELD, MO 65808-3005
PO BOX 3006, SPRINGFIELD, MO 65808-3006
PO BOX 3007, SPRINGFIELD, MO 65808-3007
PO BOX 3008, SPRINGFIELD, MO 65808-3008
PO BOX 3009, SPRINGFIELD, MO 65808-3009
PO BOX 3010, SPRINGFIELD, MO 65808-3010
PO BOX 3011, SPRINGFIELD, MO 65808-3011
PO BOX 3012, SPRINGFIELD, MO 65808-3012
PO BOX 3013, SPRINGFIELD, MO 65808-3013
PO BOX 3014, SPRINGFIELD, MO 65808-3014
PO BOX 3015, SPRINGFIELD, MO 65808-3015
PO BOX 3016, SPRINGFIELD, MO 65808-3016
PO BOX 3017, SPRINGFIELD, MO 65808-3017
PO BOX 3018, SPRINGFIELD, MO 65808-3018
PO BOX 3019, SPRINGFIELD, MO 65808-3019
PO BOX 3020, SPRINGFIELD, MO 65808-3020
PO BOX 3021, SPRINGFIELD, MO 65808-3021
PO BOX 3022, SPRINGFIELD, MO 65808-3022
PO BOX 3023, SPRINGFIELD, MO 65808-3023
PO BOX 3024, SPRINGFIELD, MO 65808-3024
PO BOX 3025, SPRINGFIELD, MO 65808-3025
PO BOX 3026, SPRINGFIELD, MO 65808-3026
PO BOX 3027, SPRINGFIELD, MO 65808-3027
PO BOX 3028, SPRINGFIELD, MO 65808-3028
PO BOX 3029, SPRINGFIELD, MO 65808-3029
PO BOX 3030, SPRINGFIELD, MO 65808-3030
PO BOX 3031, SPRINGFIELD, MO 65808-3031
PO BOX 3032, SPRINGFIELD, MO 65808-3032
PO BOX 3033, SPRINGFIELD, MO 65808-3033
PO BOX 3034, SPRINGFIELD, MO 65808-3034
PO BOX 3035, SPRINGFIELD, MO 65808-3035
PO BOX 3036, SPRINGFIELD, MO 65808-3036
PO BOX 3037, SPRINGFIELD, MO 65808-3037
PO BOX 3038, SPRINGFIELD, MO 65808-3038
PO BOX 3039, SPRINGFIELD, MO 65808-3039
PO BOX 3040, SPRINGFIELD, MO 65808-3040
PO BOX 3041, SPRINGFIELD, MO 65808-3041
PO BOX 3042, SPRINGFIELD, MO 65808-3042
PO BOX 3043, SPRINGFIELD, MO 65808-3043
PO BOX 3044, SPRINGFIELD, MO 65808-3044
PO BOX 3045, SPRINGFIELD, MO 65808-3045
PO BOX 3046, SPRINGFIELD, MO 65808-3046
PO BOX 3047, SPRINGFIELD, MO 65808-3047
PO BOX 3048, SPRINGFIELD, MO 65808-3048
PO BOX 3049, SPRINGFIELD, MO 65808-3049
PO BOX 3050, SPRINGFIELD, MO 65808-3050
PO BOX 3051, SPRINGFIELD, MO 65808-3051
PO BOX 3052, SPRINGFIELD, MO 65808-3052
PO BOX 3053, SPRINGFIELD, MO 65808-3053
PO BOX 3054, SPRINGFIELD, MO 65808-3054
PO BOX 3055, SPRINGFIELD, MO 65808-3055
PO BOX 3056, SPRINGFIELD, MO 65808-3056
PO BOX 3057, SPRINGFIELD, MO 65808-3057
PO BOX 3058, SPRINGFIELD, MO 65808-3058
PO BOX 3059, SPRINGFIELD, MO 65808-3059
PO BOX 3060, SPRINGFIELD, MO 65808-3060
PO BOX 3061, SPRINGFIELD, MO 65808-3061
PO BOX 3062, SPRINGFIELD, MO 65808-3062
PO BOX 3063, SPRINGFIELD, MO 65808-3063
PO BOX 3064, SPRINGFIELD, MO 65808-3064
PO BOX 3065, SPRINGFIELD, MO 65808-3065
PO BOX 3066, SPRINGFIELD, MO 65808-3066
PO BOX 3067, SPRINGFIELD, MO 65808-3067
PO BOX 3068, SPRINGFIELD, MO 65808-3068
PO BOX 3069, SPRINGFIELD, MO 65808-3069
PO BOX 3070, SPRINGFIELD, MO 65808-3070
PO BOX 3071, SPRINGFIELD, MO 65808-3071
PO BOX 3072, SPRINGFIELD, MO 65808-3072
PO BOX 3073, SPRINGFIELD, MO 65808-3073
PO BOX 3074, SPRINGFIELD, MO 65808-3074
PO BOX 3075, SPRINGFIELD, MO 65808-3075
PO BOX 3076, SPRINGFIELD, MO 65808-3076
PO BOX 3077, SPRINGFIELD, MO 65808-3077
PO BOX 3078, SPRINGFIELD, MO 65808-3078
PO BOX 3079, SPRINGFIELD, MO 65808-3079
PO BOX 3080, SPRINGFIELD, MO 65808-3080
PO BOX 3081, SPRINGFIELD, MO 65808-3081
PO BOX 3082, SPRINGFIELD, MO 65808-3082
PO BOX 3083, SPRINGFIELD, MO 65808-3083
PO BOX 3084, SPRINGFIELD, MO 65808-3084
PO BOX 3085, SPRINGFIELD, MO 65808-3085
PO BOX 3086, SPRINGFIELD, MO 65808-3086
PO BOX 3087, SPRINGFIELD, MO 65808-3087
PO BOX 3088, SPRINGFIELD, MO 65808-3088
PO BOX 3089, SPRINGFIELD, MO 65808-3089
PO BOX 3090, SPRINGFIELD, MO 65808-3090
PO BOX 3091, SPRINGFIELD, MO 65808-3091
PO BOX 3092, SPRINGFIELD, MO 65808-3092
PO BOX 3093, SPRINGFIELD, MO 65808-3093
PO BOX 3094, SPRINGFIELD, MO 65808-3094
PO BOX 3095, SPRINGFIELD, MO 65808-3095
PO BOX 3096, SPRINGFIELD, MO 65808-3096
PO BOX 3097, SPRINGFIELD, MO 65808-3097
PO BOX 3098, SPRINGFIELD, MO 65808-3098
PO BOX 3099, SPRINGFIELD, MO 65808-3099
PO BOX 3100, SPRINGFIELD, MO 65808-3100
PO BOX 3101, SPRINGFIELD, MO 65808-3101
PO BOX 3102, SPRINGFIELD, MO 65808-3102
PO BOX 3103, SPRINGFIELD, MO 65808-3103
PO BOX 3104, SPRINGFIELD, MO 65808-3104
PO BOX 3105, SPRINGFIELD, MO 65808-3105
PO BOX 3106, SPRINGFIELD, MO 65808-3106
PO BOX 3107, SPRINGFIELD, MO 65808-3107
PO BOX 3108, SPRINGFIELD, MO 65808-3108
PO BOX 3109, SPRINGFIELD, MO 65808-3109
PO BOX 3110, SPRINGFIELD, MO 65808-3110
PO BOX 3111, SPRINGFIELD, MO 65808-3111
PO BOX 3112, SPRINGFIELD, MO 65808-3112
PO BOX 3113, SPRINGFIELD, MO 65808-3113
PO BOX 3114, SPRINGFIELD, MO 65808-3114
PO BOX 3115, SPRINGFIELD, MO 65808-3115
PO BOX 3116, SPRINGFIELD, MO 65808-3116
PO BOX 3117, SPRINGFIELD, MO 65808-3117
PO BOX 3118, SPRINGFIELD, MO 65808-3118
PO BOX 3119, SPRINGFIELD, MO 65808-3119
PO BOX 3120, SPRINGFIELD, MO 65808-3120
PO BOX 3121, SPRINGFIELD, MO 65808-3121
PO BOX 3122, SPRINGFIELD, MO 65808-3122
PO BOX 3123, SPRINGFIELD, MO 65808-3123
PO BOX 3124, SPRINGFIELD, MO 65808-3124
PO BOX 3125, SPRINGFIELD, MO 65808-3125
PO BOX 3126, SPRINGFIELD, MO 65808-3126
PO BOX 3127, SPRINGFIELD, MO 65808-3127
PO BOX 3128, SPRINGFIELD, MO 65808-3128
PO BOX 3129, SPRINGFIELD, MO 65808-3129
PO BOX 3130, SPRINGFIELD, MO 65808-3130
PO BOX 3131, SPRINGFIELD, MO 65808-3131
PO BOX 3132, SPRINGFIELD, MO 65808-3132
PO BOX 3133, SPRINGFIELD, MO 65808-3133
PO BOX 3134, SPRINGFIELD, MO 65808-3134
PO BOX 3135, SPRINGFIELD, MO 65808-3135
PO BOX 3136, SPRINGFIELD, MO 65808-3136
PO BOX 3137, SPRINGFIELD, MO 65808-3137
PO BOX 3138, SPRINGFIELD, MO 65808-3138
PO BOX 3139, SPRINGFIELD, MO 65808-3139
PO BOX 3140, SPRINGFIELD, MO 65808-3140
PO BOX 3141, SPRINGFIELD, MO 65808-3141
PO BOX 3142, SPRINGFIELD, MO 65808-3142
PO BOX 3143, SPRINGFIELD, MO 65808-3143
PO BOX 3144, SPRINGFIELD, MO 65808-3144
PO BOX 3145, SPRINGFIELD, MO 65808-3145
PO BOX 3146, SPRINGFIELD, MO 65808-3146
PO BOX 3147, SPRINGFIELD, MO 65808-3147
PO BOX 3148, SPRINGFIELD, MO 65808-3148
PO BOX 3149, SPRINGFIELD, MO 65808-3149
PO BOX 3150, SPRINGFIELD, MO 65808-3150
PO BOX 3151, SPRINGFIELD, MO 65808-3151
PO BOX 3152, SPRINGFIELD, MO 65808-3152
PO BOX 3153, SPRINGFIELD, MO 65808-3153
PO BOX 3154, SPRINGFIELD, MO 65808-3154
PO BOX 3155, SPRINGFIELD, MO 65808-3155
PO BOX 3156, SPRINGFIELD, MO 65808-3156
PO BOX 3157, SPRINGFIELD, MO 65808-3157
PO BOX 3158, SPRINGFIELD, MO 65808-3158
PO BOX 3159, SPRINGFIELD, MO 65808-3159
PO BOX 3160, SPRINGFIELD, MO 65808-3160
PO BOX 3161, SPRINGFIELD, MO 65808-3161
PO BOX 3162, SPRINGFIELD, MO 65808-3162
PO BOX 3163, SPRINGFIELD, MO 65808-3163
PO BOX 3164, SPRINGFIELD, MO 65808-3164
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