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, NEW HARTFORD, IA 50660-0001
PO BOX 2, NEW HARTFORD, IA 50660-0002
PO BOX 3, NEW HARTFORD, IA 50660-0003
PO BOX 4, NEW HARTFORD, IA 50660-0004
PO BOX 5, NEW HARTFORD, IA 50660-0005
PO BOX 6, NEW HARTFORD, IA 50660-0006
PO BOX 7, NEW HARTFORD, IA 50660-0007
PO BOX 8, NEW HARTFORD, IA 50660-0008
PO BOX 9, NEW HARTFORD, IA 50660-0009
PO BOX 10, NEW HARTFORD, IA 50660-0010
PO BOX 11, NEW HARTFORD, IA 50660-0011
PO BOX 12, NEW HARTFORD, IA 50660-0012
PO BOX 13, NEW HARTFORD, IA 50660-0013
PO BOX 14, NEW HARTFORD, IA 50660-0014
PO BOX 15, NEW HARTFORD, IA 50660-0015
PO BOX 16, NEW HARTFORD, IA 50660-0016
PO BOX 17, NEW HARTFORD, IA 50660-0017
PO BOX 18, NEW HARTFORD, IA 50660-0018
PO BOX 19, NEW HARTFORD, IA 50660-0019
PO BOX 20, NEW HARTFORD, IA 50660-0020
PO BOX 21, NEW HARTFORD, IA 50660-0021
PO BOX 22, NEW HARTFORD, IA 50660-0022
PO BOX 23, NEW HARTFORD, IA 50660-0023
PO BOX 24, NEW HARTFORD, IA 50660-0024
PO BOX 25, NEW HARTFORD, IA 50660-0025
PO BOX 26, NEW HARTFORD, IA 50660-0026
PO BOX 27, NEW HARTFORD, IA 50660-0027
PO BOX 28, NEW HARTFORD, IA 50660-0028
PO BOX 29, NEW HARTFORD, IA 50660-0029
PO BOX 30, NEW HARTFORD, IA 50660-0030
PO BOX 31, NEW HARTFORD, IA 50660-0031
PO BOX 32, NEW HARTFORD, IA 50660-0032
PO BOX 33, NEW HARTFORD, IA 50660-0033
PO BOX 34, NEW HARTFORD, IA 50660-0034
PO BOX 35, NEW HARTFORD, IA 50660-0035
PO BOX 36, NEW HARTFORD, IA 50660-0036
PO BOX 37, NEW HARTFORD, IA 50660-0037
PO BOX 38, NEW HARTFORD, IA 50660-0038
PO BOX 39, NEW HARTFORD, IA 50660-0039
PO BOX 40, NEW HARTFORD, IA 50660-0040
PO BOX 41, NEW HARTFORD, IA 50660-0041
PO BOX 42, NEW HARTFORD, IA 50660-0042
PO BOX 43, NEW HARTFORD, IA 50660-0043
PO BOX 44, NEW HARTFORD, IA 50660-0044
PO BOX 45, NEW HARTFORD, IA 50660-0045
PO BOX 46, NEW HARTFORD, IA 50660-0046
PO BOX 47, NEW HARTFORD, IA 50660-0047
PO BOX 48, NEW HARTFORD, IA 50660-0048
PO BOX 49, NEW HARTFORD, IA 50660-0049
PO BOX 50, NEW HARTFORD, IA 50660-0050
PO BOX 51, NEW HARTFORD, IA 50660-0051
PO BOX 52, NEW HARTFORD, IA 50660-0052
PO BOX 53, NEW HARTFORD, IA 50660-0053
PO BOX 54, NEW HARTFORD, IA 50660-0054
PO BOX 55, NEW HARTFORD, IA 50660-0055
PO BOX 56, NEW HARTFORD, IA 50660-0056
PO BOX 57, NEW HARTFORD, IA 50660-0057
PO BOX 58, NEW HARTFORD, IA 50660-0058
PO BOX 59, NEW HARTFORD, IA 50660-0059
PO BOX 60, NEW HARTFORD, IA 50660-0060
PO BOX 61, NEW HARTFORD, IA 50660-0061
PO BOX 62, NEW HARTFORD, IA 50660-0062
PO BOX 63, NEW HARTFORD, IA 50660-0063
PO BOX 64, NEW HARTFORD, IA 50660-0064
PO BOX 65, NEW HARTFORD, IA 50660-0065
PO BOX 66, NEW HARTFORD, IA 50660-0066
PO BOX 67, NEW HARTFORD, IA 50660-0067
PO BOX 68, NEW HARTFORD, IA 50660-0068
PO BOX 69, NEW HARTFORD, IA 50660-0069
PO BOX 70, NEW HARTFORD, IA 50660-0070
PO BOX 71, NEW HARTFORD, IA 50660-0071
PO BOX 72, NEW HARTFORD, IA 50660-0072
PO BOX 73, NEW HARTFORD, IA 50660-0073
PO BOX 74, NEW HARTFORD, IA 50660-0074
PO BOX 75, NEW HARTFORD, IA 50660-0075
PO BOX 76, NEW HARTFORD, IA 50660-0076
PO BOX 77, NEW HARTFORD, IA 50660-0077
PO BOX 78, NEW HARTFORD, IA 50660-0078
PO BOX 79, NEW HARTFORD, IA 50660-0079
PO BOX 80, NEW HARTFORD, IA 50660-0080
PO BOX 81, NEW HARTFORD, IA 50660-0081
PO BOX 82, NEW HARTFORD, IA 50660-0082
PO BOX 83, NEW HARTFORD, IA 50660-0083
PO BOX 84, NEW HARTFORD, IA 50660-0084
PO BOX 85, NEW HARTFORD, IA 50660-0085
PO BOX 86, NEW HARTFORD, IA 50660-0086
PO BOX 87, NEW HARTFORD, IA 50660-0087
PO BOX 88, NEW HARTFORD, IA 50660-0088
PO BOX 89, NEW HARTFORD, IA 50660-0089
PO BOX 90, NEW HARTFORD, IA 50660-0090
PO BOX 91, NEW HARTFORD, IA 50660-0091
PO BOX 92, NEW HARTFORD, IA 50660-0092
PO BOX 93, NEW HARTFORD, IA 50660-0093
PO BOX 94, NEW HARTFORD, IA 50660-0094
PO BOX 95, NEW HARTFORD, IA 50660-0095
PO BOX 96, NEW HARTFORD, IA 50660-0096
PO BOX 97, NEW HARTFORD, IA 50660-0097
PO BOX 98, NEW HARTFORD, IA 50660-0098
PO BOX 99, NEW HARTFORD, IA 50660-0099
PO BOX 100, NEW HARTFORD, IA 50660-0100
PO BOX 101, NEW HARTFORD, IA 50660-0101
PO BOX 102, NEW HARTFORD, IA 50660-0102
PO BOX 103, NEW HARTFORD, IA 50660-0103
PO BOX 104, NEW HARTFORD, IA 50660-0104
PO BOX 105, NEW HARTFORD, IA 50660-0105
PO BOX 106, NEW HARTFORD, IA 50660-0106
PO BOX 107, NEW HARTFORD, IA 50660-0107
PO BOX 108, NEW HARTFORD, IA 50660-0108
PO BOX 109, NEW HARTFORD, IA 50660-0109
PO BOX 110, NEW HARTFORD, IA 50660-0110
PO BOX 111, NEW HARTFORD, IA 50660-0111
PO BOX 112, NEW HARTFORD, IA 50660-0112
PO BOX 113, NEW HARTFORD, IA 50660-0113
PO BOX 114, NEW HARTFORD, IA 50660-0114
PO BOX 115, NEW HARTFORD, IA 50660-0115
PO BOX 116, NEW HARTFORD, IA 50660-0116
PO BOX 117, NEW HARTFORD, IA 50660-0117
PO BOX 118, NEW HARTFORD, IA 50660-0118
PO BOX 119, NEW HARTFORD, IA 50660-0119
PO BOX 120, NEW HARTFORD, IA 50660-0120
PO BOX 121, NEW HARTFORD, IA 50660-0121
PO BOX 122, NEW HARTFORD, IA 50660-0122
PO BOX 123, NEW HARTFORD, IA 50660-0123
PO BOX 124, NEW HARTFORD, IA 50660-0124
PO BOX 125, NEW HARTFORD, IA 50660-0125
PO BOX 126, NEW HARTFORD, IA 50660-0126
PO BOX 127, NEW HARTFORD, IA 50660-0127
PO BOX 128, NEW HARTFORD, IA 50660-0128
PO BOX 129, NEW HARTFORD, IA 50660-0129
PO BOX 130, NEW HARTFORD, IA 50660-0130
PO BOX 131, NEW HARTFORD, IA 50660-0131
PO BOX 132, NEW HARTFORD, IA 50660-0132
PO BOX 133, NEW HARTFORD, IA 50660-0133
PO BOX 134, NEW HARTFORD, IA 50660-0134
PO BOX 135, NEW HARTFORD, IA 50660-0135
PO BOX 136, NEW HARTFORD, IA 50660-0136
PO BOX 137, NEW HARTFORD, IA 50660-0137
PO BOX 138, NEW HARTFORD, IA 50660-0138
PO BOX 139, NEW HARTFORD, IA 50660-0139
PO BOX 140, NEW HARTFORD, IA 50660-0140
PO BOX 141, NEW HARTFORD, IA 50660-0141
PO BOX 142, NEW HARTFORD, IA 50660-0142
PO BOX 143, NEW HARTFORD, IA 50660-0143
PO BOX 144, NEW HARTFORD, IA 50660-0144
PO BOX 145, NEW HARTFORD, IA 50660-0145
PO BOX 146, NEW HARTFORD, IA 50660-0146
PO BOX 147, NEW HARTFORD, IA 50660-0147
PO BOX 148, NEW HARTFORD, IA 50660-0148
PO BOX 149, NEW HARTFORD, IA 50660-0149
PO BOX 150, NEW HARTFORD, IA 50660-0150
PO BOX 151, NEW HARTFORD, IA 50660-0151
PO BOX 152, NEW HARTFORD, IA 50660-0152
PO BOX 153, NEW HARTFORD, IA 50660-0153
PO BOX 154, NEW HARTFORD, IA 50660-0154
PO BOX 155, NEW HARTFORD, IA 50660-0155
PO BOX 156, NEW HARTFORD, IA 50660-0156
PO BOX 157, NEW HARTFORD, IA 50660-0157
PO BOX 158, NEW HARTFORD, IA 50660-0158
PO BOX 159, NEW HARTFORD, IA 50660-0159
PO BOX 160, NEW HARTFORD, IA 50660-0160
PO BOX 161, NEW HARTFORD, IA 50660-0161
PO BOX 162, NEW HARTFORD, IA 50660-0162
PO BOX 163, NEW HARTFORD, IA 50660-0163
PO BOX 164, NEW HARTFORD, IA 50660-0164
PO BOX 165, NEW HARTFORD, IA 50660-0165
PO BOX 166, NEW HARTFORD, IA 50660-0166
PO BOX 167, NEW HARTFORD, IA 50660-0167
PO BOX 168, NEW HARTFORD, IA 50660-0168
PO BOX 169, NEW HARTFORD, IA 50660-0169
PO BOX 170, NEW HARTFORD, IA 50660-0170
PO BOX 171, NEW HARTFORD, IA 50660-0171
PO BOX 172, NEW HARTFORD, IA 50660-0172
PO BOX 173, NEW HARTFORD, IA 50660-0173
PO BOX 174, NEW HARTFORD, IA 50660-0174
PO BOX 175, NEW HARTFORD, IA 50660-0175
PO BOX 176, NEW HARTFORD, IA 50660-0176
PO BOX 177, NEW HARTFORD, IA 50660-0177
PO BOX 178, NEW HARTFORD, IA 50660-0178
PO BOX 179, NEW HARTFORD, IA 50660-0179
PO BOX 180, NEW HARTFORD, IA 50660-0180
PO BOX 181, NEW HARTFORD, IA 50660-0181
PO BOX 182, NEW HARTFORD, IA 50660-0182
PO BOX 183, NEW HARTFORD, IA 50660-0183
PO BOX 184, NEW HARTFORD, IA 50660-0184
PO BOX 185, NEW HARTFORD, IA 50660-0185
PO BOX 186, NEW HARTFORD, IA 50660-0186
PO BOX 187, NEW HARTFORD, IA 50660-0187
PO BOX 188, NEW HARTFORD, IA 50660-0188
PO BOX 189, NEW HARTFORD, IA 50660-0189
PO BOX 190, NEW HARTFORD, IA 50660-0190
PO BOX 191, NEW HARTFORD, IA 50660-0191
PO BOX 192, NEW HARTFORD, IA 50660-0192
PO BOX 193, NEW HARTFORD, IA 50660-0193
PO BOX 194, NEW HARTFORD, IA 50660-0194
PO BOX 195, NEW HARTFORD, IA 50660-0195
PO BOX 196, NEW HARTFORD, IA 50660-0196
PO BOX 197, NEW HARTFORD, IA 50660-0197
PO BOX 198, NEW HARTFORD, IA 50660-0198
PO BOX 199, NEW HARTFORD, IA 50660-0199
PO BOX 200, NEW HARTFORD, IA 50660-0200
PO BOX 201, NEW HARTFORD, IA 50660-0201
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