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, MANLY, IA 50456-0001
PO BOX 2, MANLY, IA 50456-0002
PO BOX 3, MANLY, IA 50456-0003
PO BOX 4, MANLY, IA 50456-0004
PO BOX 5, MANLY, IA 50456-0005
PO BOX 6, MANLY, IA 50456-0006
PO BOX 7, MANLY, IA 50456-0007
PO BOX 8, MANLY, IA 50456-0008
PO BOX 9, MANLY, IA 50456-0009
PO BOX 10, MANLY, IA 50456-0010
PO BOX 11, MANLY, IA 50456-0011
PO BOX 12, MANLY, IA 50456-0012
PO BOX 13, MANLY, IA 50456-0013
PO BOX 14, MANLY, IA 50456-0014
PO BOX 15, MANLY, IA 50456-0015
PO BOX 16, MANLY, IA 50456-0016
PO BOX 17, MANLY, IA 50456-0017
PO BOX 18, MANLY, IA 50456-0018
PO BOX 19, MANLY, IA 50456-0019
PO BOX 20, MANLY, IA 50456-0020
PO BOX 21, MANLY, IA 50456-0021
PO BOX 22, MANLY, IA 50456-0022
PO BOX 23, MANLY, IA 50456-0023
PO BOX 24, MANLY, IA 50456-0024
PO BOX 25, MANLY, IA 50456-0025
PO BOX 26, MANLY, IA 50456-0026
PO BOX 27, MANLY, IA 50456-0027
PO BOX 28, MANLY, IA 50456-0028
PO BOX 29, MANLY, IA 50456-0029
PO BOX 30, MANLY, IA 50456-0030
PO BOX 31, MANLY, IA 50456-0031
PO BOX 32, MANLY, IA 50456-0032
PO BOX 33, MANLY, IA 50456-0033
PO BOX 34, MANLY, IA 50456-0034
PO BOX 35, MANLY, IA 50456-0035
PO BOX 36, MANLY, IA 50456-0036
PO BOX 37, MANLY, IA 50456-0037
PO BOX 38, MANLY, IA 50456-0038
PO BOX 39, MANLY, IA 50456-0039
PO BOX 40, MANLY, IA 50456-0040
PO BOX 41, MANLY, IA 50456-0041
PO BOX 42, MANLY, IA 50456-0042
PO BOX 43, MANLY, IA 50456-0043
PO BOX 44, MANLY, IA 50456-0044
PO BOX 45, MANLY, IA 50456-0045
PO BOX 46, MANLY, IA 50456-0046
PO BOX 47, MANLY, IA 50456-0047
PO BOX 48, MANLY, IA 50456-0048
PO BOX 49, MANLY, IA 50456-0049
PO BOX 50, MANLY, IA 50456-0050
PO BOX 51, MANLY, IA 50456-0051
PO BOX 52, MANLY, IA 50456-0052
PO BOX 53, MANLY, IA 50456-0053
PO BOX 54, MANLY, IA 50456-0054
PO BOX 55, MANLY, IA 50456-0055
PO BOX 56, MANLY, IA 50456-0056
PO BOX 57, MANLY, IA 50456-0057
PO BOX 58, MANLY, IA 50456-0058
PO BOX 59, MANLY, IA 50456-0059
PO BOX 60, MANLY, IA 50456-0060
PO BOX 61, MANLY, IA 50456-0061
PO BOX 62, MANLY, IA 50456-0062
PO BOX 63, MANLY, IA 50456-0063
PO BOX 64, MANLY, IA 50456-0064
PO BOX 65, MANLY, IA 50456-0065
PO BOX 66, MANLY, IA 50456-0066
PO BOX 67, MANLY, IA 50456-0067
PO BOX 68, MANLY, IA 50456-0068
PO BOX 69, MANLY, IA 50456-0069
PO BOX 70, MANLY, IA 50456-0070
PO BOX 71, MANLY, IA 50456-0071
PO BOX 72, MANLY, IA 50456-0072
PO BOX 73, MANLY, IA 50456-0073
PO BOX 74, MANLY, IA 50456-0074
PO BOX 75, MANLY, IA 50456-0075
PO BOX 76, MANLY, IA 50456-0076
PO BOX 77, MANLY, IA 50456-0077
PO BOX 78, MANLY, IA 50456-0078
PO BOX 79, MANLY, IA 50456-0079
PO BOX 80, MANLY, IA 50456-0080
PO BOX 81, MANLY, IA 50456-0081
PO BOX 82, MANLY, IA 50456-0082
PO BOX 83, MANLY, IA 50456-0083
PO BOX 84, MANLY, IA 50456-0084
PO BOX 85, MANLY, IA 50456-0085
PO BOX 86, MANLY, IA 50456-0086
PO BOX 87, MANLY, IA 50456-0087
PO BOX 88, MANLY, IA 50456-0088
PO BOX 89, MANLY, IA 50456-0089
PO BOX 90, MANLY, IA 50456-0090
PO BOX 91, MANLY, IA 50456-0091
PO BOX 92, MANLY, IA 50456-0092
PO BOX 93, MANLY, IA 50456-0093
PO BOX 94, MANLY, IA 50456-0094
PO BOX 95, MANLY, IA 50456-0095
PO BOX 96, MANLY, IA 50456-0096
PO BOX 97, MANLY, IA 50456-0097
PO BOX 98, MANLY, IA 50456-0098
PO BOX 99, MANLY, IA 50456-0099
PO BOX 100, MANLY, IA 50456-0100
PO BOX 101, MANLY, IA 50456-0101
PO BOX 102, MANLY, IA 50456-0102
PO BOX 103, MANLY, IA 50456-0103
PO BOX 104, MANLY, IA 50456-0104
PO BOX 105, MANLY, IA 50456-0105
PO BOX 106, MANLY, IA 50456-0106
PO BOX 107, MANLY, IA 50456-0107
PO BOX 108, MANLY, IA 50456-0108
PO BOX 109, MANLY, IA 50456-0109
PO BOX 110, MANLY, IA 50456-0110
PO BOX 111, MANLY, IA 50456-0111
PO BOX 112, MANLY, IA 50456-0112
PO BOX 113, MANLY, IA 50456-0113
PO BOX 114, MANLY, IA 50456-0114
PO BOX 115, MANLY, IA 50456-0115
PO BOX 116, MANLY, IA 50456-0116
PO BOX 117, MANLY, IA 50456-0117
PO BOX 118, MANLY, IA 50456-0118
PO BOX 119, MANLY, IA 50456-0119
PO BOX 120, MANLY, IA 50456-0120
PO BOX 121, MANLY, IA 50456-0121
PO BOX 122, MANLY, IA 50456-0122
PO BOX 123, MANLY, IA 50456-0123
PO BOX 124, MANLY, IA 50456-0124
PO BOX 125, MANLY, IA 50456-0125
PO BOX 126, MANLY, IA 50456-0126
PO BOX 127, MANLY, IA 50456-0127
PO BOX 128, MANLY, IA 50456-0128
PO BOX 129, MANLY, IA 50456-0129
PO BOX 130, MANLY, IA 50456-0130
PO BOX 131, MANLY, IA 50456-0131
PO BOX 132, MANLY, IA 50456-0132
PO BOX 133, MANLY, IA 50456-0133
PO BOX 134, MANLY, IA 50456-0134
PO BOX 135, MANLY, IA 50456-0135
PO BOX 136, MANLY, IA 50456-0136
PO BOX 137, MANLY, IA 50456-0137
PO BOX 138, MANLY, IA 50456-0138
PO BOX 139, MANLY, IA 50456-0139
PO BOX 140, MANLY, IA 50456-0140
PO BOX 141, MANLY, IA 50456-0141
PO BOX 142, MANLY, IA 50456-0142
PO BOX 143, MANLY, IA 50456-0143
PO BOX 144, MANLY, IA 50456-0144
PO BOX 145, MANLY, IA 50456-0145
PO BOX 146, MANLY, IA 50456-0146
PO BOX 147, MANLY, IA 50456-0147
PO BOX 148, MANLY, IA 50456-0148
PO BOX 149, MANLY, IA 50456-0149
PO BOX 150, MANLY, IA 50456-0150
PO BOX 151, MANLY, IA 50456-0151
PO BOX 152, MANLY, IA 50456-0152
PO BOX 153, MANLY, IA 50456-0153
PO BOX 154, MANLY, IA 50456-0154
PO BOX 155, MANLY, IA 50456-0155
PO BOX 156, MANLY, IA 50456-0156
PO BOX 157, MANLY, IA 50456-0157
PO BOX 158, MANLY, IA 50456-0158
PO BOX 159, MANLY, IA 50456-0159
PO BOX 160, MANLY, IA 50456-0160
PO BOX 161, MANLY, IA 50456-0161
PO BOX 162, MANLY, IA 50456-0162
PO BOX 163, MANLY, IA 50456-0163
PO BOX 164, MANLY, IA 50456-0164
PO BOX 165, MANLY, IA 50456-0165
PO BOX 166, MANLY, IA 50456-0166
PO BOX 167, MANLY, IA 50456-0167
PO BOX 168, MANLY, IA 50456-0168
PO BOX 169, MANLY, IA 50456-0169
PO BOX 170, MANLY, IA 50456-0170
PO BOX 171, MANLY, IA 50456-0171
PO BOX 172, MANLY, IA 50456-0172
PO BOX 173, MANLY, IA 50456-0173
PO BOX 174, MANLY, IA 50456-0174
PO BOX 175, MANLY, IA 50456-0175
PO BOX 176, MANLY, IA 50456-0176
PO BOX 177, MANLY, IA 50456-0177
PO BOX 178, MANLY, IA 50456-0178
PO BOX 179, MANLY, IA 50456-0179
PO BOX 180, MANLY, IA 50456-0180
PO BOX 181, MANLY, IA 50456-0181
PO BOX 182, MANLY, IA 50456-0182
PO BOX 183, MANLY, IA 50456-0183
PO BOX 184, MANLY, IA 50456-0184
PO BOX 185, MANLY, IA 50456-0185
PO BOX 186, MANLY, IA 50456-0186
PO BOX 187, MANLY, IA 50456-0187
PO BOX 188, MANLY, IA 50456-0188
PO BOX 189, MANLY, IA 50456-0189
PO BOX 190, MANLY, IA 50456-0190
PO BOX 191, MANLY, IA 50456-0191
PO BOX 192, MANLY, IA 50456-0192
PO BOX 193, MANLY, IA 50456-0193
PO BOX 194, MANLY, IA 50456-0194
PO BOX 195, MANLY, IA 50456-0195
PO BOX 196, MANLY, IA 50456-0196
PO BOX 197, MANLY, IA 50456-0197
PO BOX 198, MANLY, IA 50456-0198
PO BOX 199, MANLY, IA 50456-0199
PO BOX 200, MANLY, IA 50456-0200
PO BOX 201, MANLY, IA 50456-0201
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