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, HAVELOCK, IA 50546-0001
PO BOX 2, HAVELOCK, IA 50546-0002
PO BOX 3, HAVELOCK, IA 50546-0003
PO BOX 4, HAVELOCK, IA 50546-0004
PO BOX 5, HAVELOCK, IA 50546-0005
PO BOX 6, HAVELOCK, IA 50546-0006
PO BOX 7, HAVELOCK, IA 50546-0007
PO BOX 8, HAVELOCK, IA 50546-0008
PO BOX 9, HAVELOCK, IA 50546-0009
PO BOX 10, HAVELOCK, IA 50546-0010
PO BOX 11, HAVELOCK, IA 50546-0011
PO BOX 12, HAVELOCK, IA 50546-0012
PO BOX 13, HAVELOCK, IA 50546-0013
PO BOX 14, HAVELOCK, IA 50546-0014
PO BOX 15, HAVELOCK, IA 50546-0015
PO BOX 16, HAVELOCK, IA 50546-0016
PO BOX 17, HAVELOCK, IA 50546-0017
PO BOX 18, HAVELOCK, IA 50546-0018
PO BOX 19, HAVELOCK, IA 50546-0019
PO BOX 20, HAVELOCK, IA 50546-0020
PO BOX 21, HAVELOCK, IA 50546-0021
PO BOX 22, HAVELOCK, IA 50546-0022
PO BOX 23, HAVELOCK, IA 50546-0023
PO BOX 24, HAVELOCK, IA 50546-0024
PO BOX 25, HAVELOCK, IA 50546-0025
PO BOX 26, HAVELOCK, IA 50546-0026
PO BOX 27, HAVELOCK, IA 50546-0027
PO BOX 28, HAVELOCK, IA 50546-0028
PO BOX 29, HAVELOCK, IA 50546-0029
PO BOX 30, HAVELOCK, IA 50546-0030
PO BOX 31, HAVELOCK, IA 50546-0031
PO BOX 32, HAVELOCK, IA 50546-0032
PO BOX 33, HAVELOCK, IA 50546-0033
PO BOX 34, HAVELOCK, IA 50546-0034
PO BOX 35, HAVELOCK, IA 50546-0035
PO BOX 36, HAVELOCK, IA 50546-0036
PO BOX 37, HAVELOCK, IA 50546-0037
PO BOX 38, HAVELOCK, IA 50546-0038
PO BOX 39, HAVELOCK, IA 50546-0039
PO BOX 40, HAVELOCK, IA 50546-0040
PO BOX 41, HAVELOCK, IA 50546-0041
PO BOX 42, HAVELOCK, IA 50546-0042
PO BOX 43, HAVELOCK, IA 50546-0043
PO BOX 44, HAVELOCK, IA 50546-0044
PO BOX 45, HAVELOCK, IA 50546-0045
PO BOX 46, HAVELOCK, IA 50546-0046
PO BOX 47, HAVELOCK, IA 50546-0047
PO BOX 48, HAVELOCK, IA 50546-0048
PO BOX 49, HAVELOCK, IA 50546-0049
PO BOX 50, HAVELOCK, IA 50546-0050
PO BOX 51, HAVELOCK, IA 50546-0051
PO BOX 52, HAVELOCK, IA 50546-0052
PO BOX 53, HAVELOCK, IA 50546-0053
PO BOX 54, HAVELOCK, IA 50546-0054
PO BOX 55, HAVELOCK, IA 50546-0055
PO BOX 56, HAVELOCK, IA 50546-0056
PO BOX 57, HAVELOCK, IA 50546-0057
PO BOX 58, HAVELOCK, IA 50546-0058
PO BOX 59, HAVELOCK, IA 50546-0059
PO BOX 60, HAVELOCK, IA 50546-0060
PO BOX 61, HAVELOCK, IA 50546-0061
PO BOX 62, HAVELOCK, IA 50546-0062
PO BOX 63, HAVELOCK, IA 50546-0063
PO BOX 64, HAVELOCK, IA 50546-0064
PO BOX 65, HAVELOCK, IA 50546-0065
PO BOX 66, HAVELOCK, IA 50546-0066
PO BOX 67, HAVELOCK, IA 50546-0067
PO BOX 68, HAVELOCK, IA 50546-0068
PO BOX 69, HAVELOCK, IA 50546-0069
PO BOX 70, HAVELOCK, IA 50546-0070
PO BOX 71, HAVELOCK, IA 50546-0071
PO BOX 72, HAVELOCK, IA 50546-0072
PO BOX 73, HAVELOCK, IA 50546-0073
PO BOX 74, HAVELOCK, IA 50546-0074
PO BOX 75, HAVELOCK, IA 50546-0075
PO BOX 76, HAVELOCK, IA 50546-0076
PO BOX 77, HAVELOCK, IA 50546-0077
PO BOX 78, HAVELOCK, IA 50546-0078
PO BOX 79, HAVELOCK, IA 50546-0079
PO BOX 80, HAVELOCK, IA 50546-0080
PO BOX 81, HAVELOCK, IA 50546-0081
PO BOX 82, HAVELOCK, IA 50546-0082
PO BOX 83, HAVELOCK, IA 50546-0083
PO BOX 84, HAVELOCK, IA 50546-0084
PO BOX 85, HAVELOCK, IA 50546-0085
PO BOX 86, HAVELOCK, IA 50546-0086
PO BOX 87, HAVELOCK, IA 50546-0087
PO BOX 88, HAVELOCK, IA 50546-0088
PO BOX 89, HAVELOCK, IA 50546-0089
PO BOX 90, HAVELOCK, IA 50546-0090
PO BOX 91, HAVELOCK, IA 50546-0091
PO BOX 92, HAVELOCK, IA 50546-0092
PO BOX 93, HAVELOCK, IA 50546-0093
PO BOX 94, HAVELOCK, IA 50546-0094
PO BOX 95, HAVELOCK, IA 50546-0095
PO BOX 96, HAVELOCK, IA 50546-0096
PO BOX 97, HAVELOCK, IA 50546-0097
PO BOX 98, HAVELOCK, IA 50546-0098
PO BOX 99, HAVELOCK, IA 50546-0099
PO BOX 100, HAVELOCK, IA 50546-0100
PO BOX 101, HAVELOCK, IA 50546-0101
PO BOX 102, HAVELOCK, IA 50546-0102
PO BOX 103, HAVELOCK, IA 50546-0103
PO BOX 104, HAVELOCK, IA 50546-0104
PO BOX 105, HAVELOCK, IA 50546-0105
PO BOX 106, HAVELOCK, IA 50546-0106
PO BOX 107, HAVELOCK, IA 50546-0107
PO BOX 108, HAVELOCK, IA 50546-0108
PO BOX 109, HAVELOCK, IA 50546-0109
PO BOX 110, HAVELOCK, IA 50546-0110
PO BOX 111, HAVELOCK, IA 50546-0111
PO BOX 112, HAVELOCK, IA 50546-0112
PO BOX 113, HAVELOCK, IA 50546-0113
PO BOX 114, HAVELOCK, IA 50546-0114
PO BOX 115, HAVELOCK, IA 50546-0115
PO BOX 116, HAVELOCK, IA 50546-0116
PO BOX 117, HAVELOCK, IA 50546-0117
PO BOX 118, HAVELOCK, IA 50546-0118
PO BOX 119, HAVELOCK, IA 50546-0119
PO BOX 120, HAVELOCK, IA 50546-0120
PO BOX 121, HAVELOCK, IA 50546-0121
PO BOX 122, HAVELOCK, IA 50546-0122
PO BOX 123, HAVELOCK, IA 50546-0123
PO BOX 124, HAVELOCK, IA 50546-0124
PO BOX 125, HAVELOCK, IA 50546-0125
PO BOX 126, HAVELOCK, IA 50546-0126
PO BOX 127, HAVELOCK, IA 50546-0127
PO BOX 128, HAVELOCK, IA 50546-0128
PO BOX 129, HAVELOCK, IA 50546-0129
PO BOX 130, HAVELOCK, IA 50546-0130
PO BOX 131, HAVELOCK, IA 50546-0131
PO BOX 132, HAVELOCK, IA 50546-0132
PO BOX 133, HAVELOCK, IA 50546-0133
PO BOX 134, HAVELOCK, IA 50546-0134
PO BOX 135, HAVELOCK, IA 50546-0135
PO BOX 136, HAVELOCK, IA 50546-0136
PO BOX 137, HAVELOCK, IA 50546-0137
PO BOX 138, HAVELOCK, IA 50546-0138
PO BOX 139, HAVELOCK, IA 50546-0139
PO BOX 140, HAVELOCK, IA 50546-0140
PO BOX 141, HAVELOCK, IA 50546-0141
PO BOX 142, HAVELOCK, IA 50546-0142
PO BOX 143, HAVELOCK, IA 50546-0143
PO BOX 144, HAVELOCK, IA 50546-0144
PO BOX 145, HAVELOCK, IA 50546-0145
PO BOX 146, HAVELOCK, IA 50546-0146
PO BOX 147, HAVELOCK, IA 50546-0147
PO BOX 148, HAVELOCK, IA 50546-0148
PO BOX 149, HAVELOCK, IA 50546-0149
PO BOX 150, HAVELOCK, IA 50546-0150
PO BOX 151, HAVELOCK, IA 50546-0151
PO BOX 152, HAVELOCK, IA 50546-0152
PO BOX 153, HAVELOCK, IA 50546-0153
PO BOX 154, HAVELOCK, IA 50546-0154
PO BOX 155, HAVELOCK, IA 50546-0155
PO BOX 156, HAVELOCK, IA 50546-0156
PO BOX 157, HAVELOCK, IA 50546-0157
PO BOX 158, HAVELOCK, IA 50546-0158
PO BOX 159, HAVELOCK, IA 50546-0159
PO BOX 160, HAVELOCK, IA 50546-0160
PO BOX 161, HAVELOCK, IA 50546-0161
PO BOX 162, HAVELOCK, IA 50546-0162
PO BOX 163, HAVELOCK, IA 50546-0163
PO BOX 164, HAVELOCK, IA 50546-0164
PO BOX 165, HAVELOCK, IA 50546-0165
PO BOX 166, HAVELOCK, IA 50546-0166
PO BOX 167, HAVELOCK, IA 50546-0167
PO BOX 168, HAVELOCK, IA 50546-0168
PO BOX 169, HAVELOCK, IA 50546-0169
PO BOX 170, HAVELOCK, IA 50546-0170
PO BOX 171, HAVELOCK, IA 50546-0171
PO BOX 172, HAVELOCK, IA 50546-0172
PO BOX 173, HAVELOCK, IA 50546-0173
PO BOX 174, HAVELOCK, IA 50546-0174
PO BOX 175, HAVELOCK, IA 50546-0175
PO BOX 176, HAVELOCK, IA 50546-0176
PO BOX 177, HAVELOCK, IA 50546-0177
PO BOX 178, HAVELOCK, IA 50546-0178
PO BOX 179, HAVELOCK, IA 50546-0179
PO BOX 180, HAVELOCK, IA 50546-0180
PO BOX 181, HAVELOCK, IA 50546-0181
PO BOX 182, HAVELOCK, IA 50546-0182
PO BOX 183, HAVELOCK, IA 50546-0183
PO BOX 184, HAVELOCK, IA 50546-0184
PO BOX 185, HAVELOCK, IA 50546-0185
PO BOX 186, HAVELOCK, IA 50546-0186
PO BOX 187, HAVELOCK, IA 50546-0187
PO BOX 188, HAVELOCK, IA 50546-0188
PO BOX 189, HAVELOCK, IA 50546-0189
PO BOX 190, HAVELOCK, IA 50546-0190
PO BOX 191, HAVELOCK, IA 50546-0191
PO BOX 192, HAVELOCK, IA 50546-0192
PO BOX 193, HAVELOCK, IA 50546-0193
PO BOX 194, HAVELOCK, IA 50546-0194
PO BOX 195, HAVELOCK, IA 50546-0195
PO BOX 196, HAVELOCK, IA 50546-0196
PO BOX 197, HAVELOCK, IA 50546-0197
PO BOX 198, HAVELOCK, IA 50546-0198
PO BOX 199, HAVELOCK, IA 50546-0199
PO BOX 200, HAVELOCK, IA 50546-0200
PO BOX 201, HAVELOCK, IA 50546-0201
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