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, GREENE, IA 50636-0001
PO BOX 2, GREENE, IA 50636-0002
PO BOX 3, GREENE, IA 50636-0003
PO BOX 4, GREENE, IA 50636-0004
PO BOX 5, GREENE, IA 50636-0005
PO BOX 6, GREENE, IA 50636-0006
PO BOX 7, GREENE, IA 50636-0007
PO BOX 8, GREENE, IA 50636-0008
PO BOX 9, GREENE, IA 50636-0009
PO BOX 10, GREENE, IA 50636-0010
PO BOX 11, GREENE, IA 50636-0011
PO BOX 12, GREENE, IA 50636-0012
PO BOX 13, GREENE, IA 50636-0013
PO BOX 14, GREENE, IA 50636-0014
PO BOX 15, GREENE, IA 50636-0015
PO BOX 16, GREENE, IA 50636-0016
PO BOX 17, GREENE, IA 50636-0017
PO BOX 18, GREENE, IA 50636-0018
PO BOX 19, GREENE, IA 50636-0019
PO BOX 20, GREENE, IA 50636-0020
PO BOX 21, GREENE, IA 50636-0021
PO BOX 22, GREENE, IA 50636-0022
PO BOX 23, GREENE, IA 50636-0023
PO BOX 24, GREENE, IA 50636-0024
PO BOX 25, GREENE, IA 50636-0025
PO BOX 26, GREENE, IA 50636-0026
PO BOX 27, GREENE, IA 50636-0027
PO BOX 28, GREENE, IA 50636-0028
PO BOX 29, GREENE, IA 50636-0029
PO BOX 30, GREENE, IA 50636-0030
PO BOX 31, GREENE, IA 50636-0031
PO BOX 32, GREENE, IA 50636-0032
PO BOX 33, GREENE, IA 50636-0033
PO BOX 34, GREENE, IA 50636-0034
PO BOX 35, GREENE, IA 50636-0035
PO BOX 36, GREENE, IA 50636-0036
PO BOX 37, GREENE, IA 50636-0037
PO BOX 38, GREENE, IA 50636-0038
PO BOX 39, GREENE, IA 50636-0039
PO BOX 40, GREENE, IA 50636-0040
PO BOX 41, GREENE, IA 50636-0041
PO BOX 42, GREENE, IA 50636-0042
PO BOX 43, GREENE, IA 50636-0043
PO BOX 44, GREENE, IA 50636-0044
PO BOX 45, GREENE, IA 50636-0045
PO BOX 46, GREENE, IA 50636-0046
PO BOX 47, GREENE, IA 50636-0047
PO BOX 48, GREENE, IA 50636-0048
PO BOX 49, GREENE, IA 50636-0049
PO BOX 50, GREENE, IA 50636-0050
PO BOX 51, GREENE, IA 50636-0051
PO BOX 52, GREENE, IA 50636-0052
PO BOX 53, GREENE, IA 50636-0053
PO BOX 54, GREENE, IA 50636-0054
PO BOX 55, GREENE, IA 50636-0055
PO BOX 56, GREENE, IA 50636-0056
PO BOX 57, GREENE, IA 50636-0057
PO BOX 58, GREENE, IA 50636-0058
PO BOX 59, GREENE, IA 50636-0059
PO BOX 60, GREENE, IA 50636-0060
PO BOX 61, GREENE, IA 50636-0061
PO BOX 62, GREENE, IA 50636-0062
PO BOX 63, GREENE, IA 50636-0063
PO BOX 64, GREENE, IA 50636-0064
PO BOX 65, GREENE, IA 50636-0065
PO BOX 66, GREENE, IA 50636-0066
PO BOX 67, GREENE, IA 50636-0067
PO BOX 68, GREENE, IA 50636-0068
PO BOX 69, GREENE, IA 50636-0069
PO BOX 70, GREENE, IA 50636-0070
PO BOX 71, GREENE, IA 50636-0071
PO BOX 72, GREENE, IA 50636-0072
PO BOX 73, GREENE, IA 50636-0073
PO BOX 74, GREENE, IA 50636-0074
PO BOX 75, GREENE, IA 50636-0075
PO BOX 76, GREENE, IA 50636-0076
PO BOX 77, GREENE, IA 50636-0077
PO BOX 78, GREENE, IA 50636-0078
PO BOX 79, GREENE, IA 50636-0079
PO BOX 80, GREENE, IA 50636-0080
PO BOX 81, GREENE, IA 50636-0081
PO BOX 82, GREENE, IA 50636-0082
PO BOX 83, GREENE, IA 50636-0083
PO BOX 84, GREENE, IA 50636-0084
PO BOX 85, GREENE, IA 50636-0085
PO BOX 86, GREENE, IA 50636-0086
PO BOX 87, GREENE, IA 50636-0087
PO BOX 88, GREENE, IA 50636-0088
PO BOX 89, GREENE, IA 50636-0089
PO BOX 90, GREENE, IA 50636-0090
PO BOX 91, GREENE, IA 50636-0091
PO BOX 92, GREENE, IA 50636-0092
PO BOX 93, GREENE, IA 50636-0093
PO BOX 94, GREENE, IA 50636-0094
PO BOX 95, GREENE, IA 50636-0095
PO BOX 96, GREENE, IA 50636-0096
PO BOX 97, GREENE, IA 50636-0097
PO BOX 98, GREENE, IA 50636-0098
PO BOX 99, GREENE, IA 50636-0099
PO BOX 100, GREENE, IA 50636-0100
PO BOX 101, GREENE, IA 50636-0101
PO BOX 102, GREENE, IA 50636-0102
PO BOX 103, GREENE, IA 50636-0103
PO BOX 104, GREENE, IA 50636-0104
PO BOX 105, GREENE, IA 50636-0105
PO BOX 106, GREENE, IA 50636-0106
PO BOX 107, GREENE, IA 50636-0107
PO BOX 108, GREENE, IA 50636-0108
PO BOX 109, GREENE, IA 50636-0109
PO BOX 110, GREENE, IA 50636-0110
PO BOX 111, GREENE, IA 50636-0111
PO BOX 112, GREENE, IA 50636-0112
PO BOX 113, GREENE, IA 50636-0113
PO BOX 114, GREENE, IA 50636-0114
PO BOX 115, GREENE, IA 50636-0115
PO BOX 116, GREENE, IA 50636-0116
PO BOX 117, GREENE, IA 50636-0117
PO BOX 118, GREENE, IA 50636-0118
PO BOX 119, GREENE, IA 50636-0119
PO BOX 120, GREENE, IA 50636-0120
PO BOX 121, GREENE, IA 50636-0121
PO BOX 122, GREENE, IA 50636-0122
PO BOX 123, GREENE, IA 50636-0123
PO BOX 124, GREENE, IA 50636-0124
PO BOX 125, GREENE, IA 50636-0125
PO BOX 126, GREENE, IA 50636-0126
PO BOX 127, GREENE, IA 50636-0127
PO BOX 128, GREENE, IA 50636-0128
PO BOX 129, GREENE, IA 50636-0129
PO BOX 130, GREENE, IA 50636-0130
PO BOX 131, GREENE, IA 50636-0131
PO BOX 132, GREENE, IA 50636-0132
PO BOX 133, GREENE, IA 50636-0133
PO BOX 134, GREENE, IA 50636-0134
PO BOX 135, GREENE, IA 50636-0135
PO BOX 136, GREENE, IA 50636-0136
PO BOX 137, GREENE, IA 50636-0137
PO BOX 138, GREENE, IA 50636-0138
PO BOX 139, GREENE, IA 50636-0139
PO BOX 140, GREENE, IA 50636-0140
PO BOX 141, GREENE, IA 50636-0141
PO BOX 142, GREENE, IA 50636-0142
PO BOX 143, GREENE, IA 50636-0143
PO BOX 144, GREENE, IA 50636-0144
PO BOX 145, GREENE, IA 50636-0145
PO BOX 146, GREENE, IA 50636-0146
PO BOX 147, GREENE, IA 50636-0147
PO BOX 148, GREENE, IA 50636-0148
PO BOX 149, GREENE, IA 50636-0149
PO BOX 150, GREENE, IA 50636-0150
PO BOX 151, GREENE, IA 50636-0151
PO BOX 152, GREENE, IA 50636-0152
PO BOX 153, GREENE, IA 50636-0153
PO BOX 154, GREENE, IA 50636-0154
PO BOX 155, GREENE, IA 50636-0155
PO BOX 156, GREENE, IA 50636-0156
PO BOX 157, GREENE, IA 50636-0157
PO BOX 158, GREENE, IA 50636-0158
PO BOX 159, GREENE, IA 50636-0159
PO BOX 160, GREENE, IA 50636-0160
PO BOX 161, GREENE, IA 50636-0161
PO BOX 162, GREENE, IA 50636-0162
PO BOX 163, GREENE, IA 50636-0163
PO BOX 164, GREENE, IA 50636-0164
PO BOX 165, GREENE, IA 50636-0165
PO BOX 166, GREENE, IA 50636-0166
PO BOX 167, GREENE, IA 50636-0167
PO BOX 168, GREENE, IA 50636-0168
PO BOX 169, GREENE, IA 50636-0169
PO BOX 170, GREENE, IA 50636-0170
PO BOX 171, GREENE, IA 50636-0171
PO BOX 172, GREENE, IA 50636-0172
PO BOX 173, GREENE, IA 50636-0173
PO BOX 174, GREENE, IA 50636-0174
PO BOX 175, GREENE, IA 50636-0175
PO BOX 176, GREENE, IA 50636-0176
PO BOX 177, GREENE, IA 50636-0177
PO BOX 178, GREENE, IA 50636-0178
PO BOX 179, GREENE, IA 50636-0179
PO BOX 180, GREENE, IA 50636-0180
PO BOX 181, GREENE, IA 50636-0181
PO BOX 182, GREENE, IA 50636-0182
PO BOX 183, GREENE, IA 50636-0183
PO BOX 184, GREENE, IA 50636-0184
PO BOX 185, GREENE, IA 50636-0185
PO BOX 186, GREENE, IA 50636-0186
PO BOX 187, GREENE, IA 50636-0187
PO BOX 188, GREENE, IA 50636-0188
PO BOX 189, GREENE, IA 50636-0189
PO BOX 190, GREENE, IA 50636-0190
PO BOX 191, GREENE, IA 50636-0191
PO BOX 192, GREENE, IA 50636-0192
PO BOX 193, GREENE, IA 50636-0193
PO BOX 194, GREENE, IA 50636-0194
PO BOX 195, GREENE, IA 50636-0195
PO BOX 196, GREENE, IA 50636-0196
PO BOX 197, GREENE, IA 50636-0197
PO BOX 198, GREENE, IA 50636-0198
PO BOX 199, GREENE, IA 50636-0199
PO BOX 200, GREENE, IA 50636-0200
PO BOX 201, GREENE, IA 50636-0201
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