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 1, MELVIN, IA 51350-0001
PO BOX 2, MELVIN, IA 51350-0002
PO BOX 3, MELVIN, IA 51350-0003
PO BOX 4, MELVIN, IA 51350-0004
PO BOX 5, MELVIN, IA 51350-0005
PO BOX 6, MELVIN, IA 51350-0006
PO BOX 7, MELVIN, IA 51350-0007
PO BOX 8, MELVIN, IA 51350-0008
PO BOX 9, MELVIN, IA 51350-0009
PO BOX 10, MELVIN, IA 51350-0010
PO BOX 11, MELVIN, IA 51350-0011
PO BOX 12, MELVIN, IA 51350-0012
PO BOX 13, MELVIN, IA 51350-0013
PO BOX 14, MELVIN, IA 51350-0014
PO BOX 15, MELVIN, IA 51350-0015
PO BOX 16, MELVIN, IA 51350-0016
PO BOX 17, MELVIN, IA 51350-0017
PO BOX 18, MELVIN, IA 51350-0018
PO BOX 19, MELVIN, IA 51350-0019
PO BOX 20, MELVIN, IA 51350-0020
PO BOX 21, MELVIN, IA 51350-0021
PO BOX 22, MELVIN, IA 51350-0022
PO BOX 23, MELVIN, IA 51350-0023
PO BOX 24, MELVIN, IA 51350-0024
PO BOX 25, MELVIN, IA 51350-0025
PO BOX 26, MELVIN, IA 51350-0026
PO BOX 27, MELVIN, IA 51350-0027
PO BOX 28, MELVIN, IA 51350-0028
PO BOX 29, MELVIN, IA 51350-0029
PO BOX 30, MELVIN, IA 51350-0030
PO BOX 31, MELVIN, IA 51350-0031
PO BOX 32, MELVIN, IA 51350-0032
PO BOX 33, MELVIN, IA 51350-0033
PO BOX 34, MELVIN, IA 51350-0034
PO BOX 35, MELVIN, IA 51350-0035
PO BOX 36, MELVIN, IA 51350-0036
PO BOX 37, MELVIN, IA 51350-0037
PO BOX 38, MELVIN, IA 51350-0038
PO BOX 39, MELVIN, IA 51350-0039
PO BOX 40, MELVIN, IA 51350-0040
PO BOX 41, MELVIN, IA 51350-0041
PO BOX 42, MELVIN, IA 51350-0042
PO BOX 43, MELVIN, IA 51350-0043
PO BOX 44, MELVIN, IA 51350-0044
PO BOX 45, MELVIN, IA 51350-0045
PO BOX 46, MELVIN, IA 51350-0046
PO BOX 47, MELVIN, IA 51350-0047
PO BOX 48, MELVIN, IA 51350-0048
PO BOX 49, MELVIN, IA 51350-0049
PO BOX 50, MELVIN, IA 51350-0050
PO BOX 51, MELVIN, IA 51350-0051
PO BOX 52, MELVIN, IA 51350-0052
PO BOX 53, MELVIN, IA 51350-0053
PO BOX 54, MELVIN, IA 51350-0054
PO BOX 55, MELVIN, IA 51350-0055
PO BOX 56, MELVIN, IA 51350-0056
PO BOX 57, MELVIN, IA 51350-0057
PO BOX 58, MELVIN, IA 51350-0058
PO BOX 59, MELVIN, IA 51350-0059
PO BOX 60, MELVIN, IA 51350-0060
PO BOX 61, MELVIN, IA 51350-0061
PO BOX 62, MELVIN, IA 51350-0062
PO BOX 63, MELVIN, IA 51350-0063
PO BOX 64, MELVIN, IA 51350-0064
PO BOX 65, MELVIN, IA 51350-0065
PO BOX 66, MELVIN, IA 51350-0066
PO BOX 67, MELVIN, IA 51350-0067
PO BOX 68, MELVIN, IA 51350-0068
PO BOX 69, MELVIN, IA 51350-0069
PO BOX 70, MELVIN, IA 51350-0070
PO BOX 71, MELVIN, IA 51350-0071
PO BOX 72, MELVIN, IA 51350-0072
PO BOX 73, MELVIN, IA 51350-0073
PO BOX 74, MELVIN, IA 51350-0074
PO BOX 75, MELVIN, IA 51350-0075
PO BOX 76, MELVIN, IA 51350-0076
PO BOX 77, MELVIN, IA 51350-0077
PO BOX 78, MELVIN, IA 51350-0078
PO BOX 79, MELVIN, IA 51350-0079
PO BOX 80, MELVIN, IA 51350-0080
PO BOX 81, MELVIN, IA 51350-0081
PO BOX 82, MELVIN, IA 51350-0082
PO BOX 83, MELVIN, IA 51350-0083
PO BOX 84, MELVIN, IA 51350-0084
PO BOX 85, MELVIN, IA 51350-0085
PO BOX 86, MELVIN, IA 51350-0086
PO BOX 87, MELVIN, IA 51350-0087
PO BOX 88, MELVIN, IA 51350-0088
PO BOX 89, MELVIN, IA 51350-0089
PO BOX 90, MELVIN, IA 51350-0090
PO BOX 91, MELVIN, IA 51350-0091
PO BOX 92, MELVIN, IA 51350-0092
PO BOX 93, MELVIN, IA 51350-0093
PO BOX 94, MELVIN, IA 51350-0094
PO BOX 95, MELVIN, IA 51350-0095
PO BOX 96, MELVIN, IA 51350-0096
PO BOX 97, MELVIN, IA 51350-0097
PO BOX 98, MELVIN, IA 51350-0098
PO BOX 99, MELVIN, IA 51350-0099
PO BOX 100, MELVIN, IA 51350-0100
PO BOX 101, MELVIN, IA 51350-0101
PO BOX 102, MELVIN, IA 51350-0102
PO BOX 103, MELVIN, IA 51350-0103
PO BOX 104, MELVIN, IA 51350-0104
PO BOX 105, MELVIN, IA 51350-0105
PO BOX 106, MELVIN, IA 51350-0106
PO BOX 107, MELVIN, IA 51350-0107
PO BOX 108, MELVIN, IA 51350-0108
PO BOX 109, MELVIN, IA 51350-0109
PO BOX 110, MELVIN, IA 51350-0110
PO BOX 111, MELVIN, IA 51350-0111
PO BOX 112, MELVIN, IA 51350-0112
PO BOX 113, MELVIN, IA 51350-0113
PO BOX 114, MELVIN, IA 51350-0114
PO BOX 115, MELVIN, IA 51350-0115
PO BOX 116, MELVIN, IA 51350-0116
PO BOX 117, MELVIN, IA 51350-0117
PO BOX 118, MELVIN, IA 51350-0118
PO BOX 119, MELVIN, IA 51350-0119
PO BOX 120, MELVIN, IA 51350-0120
PO BOX 121, MELVIN, IA 51350-0121
PO BOX 122, MELVIN, IA 51350-0122
PO BOX 123, MELVIN, IA 51350-0123
PO BOX 124, MELVIN, IA 51350-0124
PO BOX 125, MELVIN, IA 51350-0125
PO BOX 126, MELVIN, IA 51350-0126
PO BOX 127, MELVIN, IA 51350-0127
PO BOX 128, MELVIN, IA 51350-0128
PO BOX 129, MELVIN, IA 51350-0129
PO BOX 130, MELVIN, IA 51350-0130
PO BOX 131, MELVIN, IA 51350-0131
PO BOX 132, MELVIN, IA 51350-0132
PO BOX 133, MELVIN, IA 51350-0133
PO BOX 134, MELVIN, IA 51350-0134
PO BOX 135, MELVIN, IA 51350-0135
PO BOX 136, MELVIN, IA 51350-0136
PO BOX 137, MELVIN, IA 51350-0137
PO BOX 138, MELVIN, IA 51350-0138
PO BOX 139, MELVIN, IA 51350-0139
PO BOX 140, MELVIN, IA 51350-0140
PO BOX 141, MELVIN, IA 51350-0141
PO BOX 142, MELVIN, IA 51350-0142
PO BOX 143, MELVIN, IA 51350-0143
PO BOX 144, MELVIN, IA 51350-0144
PO BOX 145, MELVIN, IA 51350-0145
PO BOX 146, MELVIN, IA 51350-0146
PO BOX 147, MELVIN, IA 51350-0147
PO BOX 148, MELVIN, IA 51350-0148
PO BOX 149, MELVIN, IA 51350-0149
PO BOX 150, MELVIN, IA 51350-0150
PO BOX 151, MELVIN, IA 51350-0151
PO BOX 152, MELVIN, IA 51350-0152
PO BOX 153, MELVIN, IA 51350-0153
PO BOX 154, MELVIN, IA 51350-0154
PO BOX 155, MELVIN, IA 51350-0155
PO BOX 156, MELVIN, IA 51350-0156
PO BOX 157, MELVIN, IA 51350-0157
PO BOX 158, MELVIN, IA 51350-0158
PO BOX 159, MELVIN, IA 51350-0159
PO BOX 160, MELVIN, IA 51350-0160
PO BOX 161, MELVIN, IA 51350-0161
PO BOX 162, MELVIN, IA 51350-0162
PO BOX 163, MELVIN, IA 51350-0163
PO BOX 164, MELVIN, IA 51350-0164
PO BOX 165, MELVIN, IA 51350-0165
PO BOX 166, MELVIN, IA 51350-0166
PO BOX 167, MELVIN, IA 51350-0167
PO BOX 168, MELVIN, IA 51350-0168
PO BOX 169, MELVIN, IA 51350-0169
PO BOX 170, MELVIN, IA 51350-0170
PO BOX 171, MELVIN, IA 51350-0171
PO BOX 172, MELVIN, IA 51350-0172
PO BOX 173, MELVIN, IA 51350-0173
PO BOX 174, MELVIN, IA 51350-0174
PO BOX 175, MELVIN, IA 51350-0175
PO BOX 176, MELVIN, IA 51350-0176
PO BOX 177, MELVIN, IA 51350-0177
PO BOX 178, MELVIN, IA 51350-0178
PO BOX 179, MELVIN, IA 51350-0179
PO BOX 180, MELVIN, IA 51350-0180
PO BOX 181, MELVIN, IA 51350-0181
PO BOX 182, MELVIN, IA 51350-0182
PO BOX 183, MELVIN, IA 51350-0183
PO BOX 184, MELVIN, IA 51350-0184
PO BOX 185, MELVIN, IA 51350-0185
PO BOX 186, MELVIN, IA 51350-0186
PO BOX 187, MELVIN, IA 51350-0187
PO BOX 188, MELVIN, IA 51350-0188
PO BOX 189, MELVIN, IA 51350-0189
PO BOX 190, MELVIN, IA 51350-0190
PO BOX 191, MELVIN, IA 51350-0191
PO BOX 192, MELVIN, IA 51350-0192
PO BOX 193, MELVIN, IA 51350-0193
PO BOX 194, MELVIN, IA 51350-0194
PO BOX 195, MELVIN, IA 51350-0195
PO BOX 196, MELVIN, IA 51350-0196
PO BOX 197, MELVIN, IA 51350-0197
PO BOX 198, MELVIN, IA 51350-0198
PO BOX 199, MELVIN, IA 51350-0199
PO BOX 200, MELVIN, IA 51350-0200
PO BOX 201, MELVIN, IA 51350-0201
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