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, HARTFORD, IA 50118-0001
PO BOX 2, HARTFORD, IA 50118-0002
PO BOX 3, HARTFORD, IA 50118-0003
PO BOX 4, HARTFORD, IA 50118-0004
PO BOX 5, HARTFORD, IA 50118-0005
PO BOX 6, HARTFORD, IA 50118-0006
PO BOX 7, HARTFORD, IA 50118-0007
PO BOX 8, HARTFORD, IA 50118-0008
PO BOX 9, HARTFORD, IA 50118-0009
PO BOX 10, HARTFORD, IA 50118-0010
PO BOX 11, HARTFORD, IA 50118-0011
PO BOX 12, HARTFORD, IA 50118-0012
PO BOX 13, HARTFORD, IA 50118-0013
PO BOX 14, HARTFORD, IA 50118-0014
PO BOX 15, HARTFORD, IA 50118-0015
PO BOX 16, HARTFORD, IA 50118-0016
PO BOX 17, HARTFORD, IA 50118-0017
PO BOX 18, HARTFORD, IA 50118-0018
PO BOX 19, HARTFORD, IA 50118-0019
PO BOX 20, HARTFORD, IA 50118-0020
PO BOX 21, HARTFORD, IA 50118-0021
PO BOX 22, HARTFORD, IA 50118-0022
PO BOX 23, HARTFORD, IA 50118-0023
PO BOX 24, HARTFORD, IA 50118-0024
PO BOX 25, HARTFORD, IA 50118-0025
PO BOX 26, HARTFORD, IA 50118-0026
PO BOX 27, HARTFORD, IA 50118-0027
PO BOX 28, HARTFORD, IA 50118-0028
PO BOX 29, HARTFORD, IA 50118-0029
PO BOX 30, HARTFORD, IA 50118-0030
PO BOX 31, HARTFORD, IA 50118-0031
PO BOX 32, HARTFORD, IA 50118-0032
PO BOX 33, HARTFORD, IA 50118-0033
PO BOX 34, HARTFORD, IA 50118-0034
PO BOX 35, HARTFORD, IA 50118-0035
PO BOX 36, HARTFORD, IA 50118-0036
PO BOX 37, HARTFORD, IA 50118-0037
PO BOX 38, HARTFORD, IA 50118-0038
PO BOX 39, HARTFORD, IA 50118-0039
PO BOX 40, HARTFORD, IA 50118-0040
PO BOX 41, HARTFORD, IA 50118-0041
PO BOX 42, HARTFORD, IA 50118-0042
PO BOX 43, HARTFORD, IA 50118-0043
PO BOX 44, HARTFORD, IA 50118-0044
PO BOX 45, HARTFORD, IA 50118-0045
PO BOX 46, HARTFORD, IA 50118-0046
PO BOX 47, HARTFORD, IA 50118-0047
PO BOX 48, HARTFORD, IA 50118-0048
PO BOX 49, HARTFORD, IA 50118-0049
PO BOX 50, HARTFORD, IA 50118-0050
PO BOX 51, HARTFORD, IA 50118-0051
PO BOX 52, HARTFORD, IA 50118-0052
PO BOX 53, HARTFORD, IA 50118-0053
PO BOX 54, HARTFORD, IA 50118-0054
PO BOX 55, HARTFORD, IA 50118-0055
PO BOX 56, HARTFORD, IA 50118-0056
PO BOX 57, HARTFORD, IA 50118-0057
PO BOX 58, HARTFORD, IA 50118-0058
PO BOX 59, HARTFORD, IA 50118-0059
PO BOX 60, HARTFORD, IA 50118-0060
PO BOX 61, HARTFORD, IA 50118-0061
PO BOX 62, HARTFORD, IA 50118-0062
PO BOX 63, HARTFORD, IA 50118-0063
PO BOX 64, HARTFORD, IA 50118-0064
PO BOX 65, HARTFORD, IA 50118-0065
PO BOX 66, HARTFORD, IA 50118-0066
PO BOX 67, HARTFORD, IA 50118-0067
PO BOX 68, HARTFORD, IA 50118-0068
PO BOX 69, HARTFORD, IA 50118-0069
PO BOX 70, HARTFORD, IA 50118-0070
PO BOX 71, HARTFORD, IA 50118-0071
PO BOX 72, HARTFORD, IA 50118-0072
PO BOX 73, HARTFORD, IA 50118-0073
PO BOX 74, HARTFORD, IA 50118-0074
PO BOX 75, HARTFORD, IA 50118-0075
PO BOX 76, HARTFORD, IA 50118-0076
PO BOX 77, HARTFORD, IA 50118-0077
PO BOX 78, HARTFORD, IA 50118-0078
PO BOX 79, HARTFORD, IA 50118-0079
PO BOX 80, HARTFORD, IA 50118-0080
PO BOX 81, HARTFORD, IA 50118-0081
PO BOX 82, HARTFORD, IA 50118-0082
PO BOX 83, HARTFORD, IA 50118-0083
PO BOX 84, HARTFORD, IA 50118-0084
PO BOX 85, HARTFORD, IA 50118-0085
PO BOX 86, HARTFORD, IA 50118-0086
PO BOX 87, HARTFORD, IA 50118-0087
PO BOX 88, HARTFORD, IA 50118-0088
PO BOX 89, HARTFORD, IA 50118-0089
PO BOX 90, HARTFORD, IA 50118-0090
PO BOX 91, HARTFORD, IA 50118-0091
PO BOX 92, HARTFORD, IA 50118-0092
PO BOX 93, HARTFORD, IA 50118-0093
PO BOX 94, HARTFORD, IA 50118-0094
PO BOX 95, HARTFORD, IA 50118-0095
PO BOX 96, HARTFORD, IA 50118-0096
PO BOX 97, HARTFORD, IA 50118-0097
PO BOX 98, HARTFORD, IA 50118-0098
PO BOX 99, HARTFORD, IA 50118-0099
PO BOX 100, HARTFORD, IA 50118-0100
PO BOX 101, HARTFORD, IA 50118-0101
PO BOX 102, HARTFORD, IA 50118-0102
PO BOX 103, HARTFORD, IA 50118-0103
PO BOX 104, HARTFORD, IA 50118-0104
PO BOX 105, HARTFORD, IA 50118-0105
PO BOX 106, HARTFORD, IA 50118-0106
PO BOX 107, HARTFORD, IA 50118-0107
PO BOX 108, HARTFORD, IA 50118-0108
PO BOX 109, HARTFORD, IA 50118-0109
PO BOX 110, HARTFORD, IA 50118-0110
PO BOX 111, HARTFORD, IA 50118-0111
PO BOX 112, HARTFORD, IA 50118-0112
PO BOX 113, HARTFORD, IA 50118-0113
PO BOX 114, HARTFORD, IA 50118-0114
PO BOX 115, HARTFORD, IA 50118-0115
PO BOX 116, HARTFORD, IA 50118-0116
PO BOX 117, HARTFORD, IA 50118-0117
PO BOX 118, HARTFORD, IA 50118-0118
PO BOX 119, HARTFORD, IA 50118-0119
PO BOX 120, HARTFORD, IA 50118-0120
PO BOX 121, HARTFORD, IA 50118-0121
PO BOX 122, HARTFORD, IA 50118-0122
PO BOX 123, HARTFORD, IA 50118-0123
PO BOX 124, HARTFORD, IA 50118-0124
PO BOX 125, HARTFORD, IA 50118-0125
PO BOX 126, HARTFORD, IA 50118-0126
PO BOX 127, HARTFORD, IA 50118-0127
PO BOX 128, HARTFORD, IA 50118-0128
PO BOX 129, HARTFORD, IA 50118-0129
PO BOX 130, HARTFORD, IA 50118-0130
PO BOX 131, HARTFORD, IA 50118-0131
PO BOX 132, HARTFORD, IA 50118-0132
PO BOX 133, HARTFORD, IA 50118-0133
PO BOX 134, HARTFORD, IA 50118-0134
PO BOX 135, HARTFORD, IA 50118-0135
PO BOX 136, HARTFORD, IA 50118-0136
PO BOX 137, HARTFORD, IA 50118-0137
PO BOX 138, HARTFORD, IA 50118-0138
PO BOX 139, HARTFORD, IA 50118-0139
PO BOX 140, HARTFORD, IA 50118-0140
PO BOX 141, HARTFORD, IA 50118-0141
PO BOX 142, HARTFORD, IA 50118-0142
PO BOX 143, HARTFORD, IA 50118-0143
PO BOX 144, HARTFORD, IA 50118-0144
PO BOX 145, HARTFORD, IA 50118-0145
PO BOX 146, HARTFORD, IA 50118-0146
PO BOX 147, HARTFORD, IA 50118-0147
PO BOX 148, HARTFORD, IA 50118-0148
PO BOX 149, HARTFORD, IA 50118-0149
PO BOX 150, HARTFORD, IA 50118-0150
PO BOX 151, HARTFORD, IA 50118-0151
PO BOX 152, HARTFORD, IA 50118-0152
PO BOX 153, HARTFORD, IA 50118-0153
PO BOX 154, HARTFORD, IA 50118-0154
PO BOX 155, HARTFORD, IA 50118-0155
PO BOX 156, HARTFORD, IA 50118-0156
PO BOX 157, HARTFORD, IA 50118-0157
PO BOX 158, HARTFORD, IA 50118-0158
PO BOX 159, HARTFORD, IA 50118-0159
PO BOX 160, HARTFORD, IA 50118-0160
PO BOX 161, HARTFORD, IA 50118-0161
PO BOX 162, HARTFORD, IA 50118-0162
PO BOX 163, HARTFORD, IA 50118-0163
PO BOX 164, HARTFORD, IA 50118-0164
PO BOX 165, HARTFORD, IA 50118-0165
PO BOX 166, HARTFORD, IA 50118-0166
PO BOX 167, HARTFORD, IA 50118-0167
PO BOX 168, HARTFORD, IA 50118-0168
PO BOX 169, HARTFORD, IA 50118-0169
PO BOX 170, HARTFORD, IA 50118-0170
PO BOX 171, HARTFORD, IA 50118-0171
PO BOX 172, HARTFORD, IA 50118-0172
PO BOX 173, HARTFORD, IA 50118-0173
PO BOX 174, HARTFORD, IA 50118-0174
PO BOX 175, HARTFORD, IA 50118-0175
PO BOX 176, HARTFORD, IA 50118-0176
PO BOX 177, HARTFORD, IA 50118-0177
PO BOX 178, HARTFORD, IA 50118-0178
PO BOX 179, HARTFORD, IA 50118-0179
PO BOX 180, HARTFORD, IA 50118-0180
PO BOX 181, HARTFORD, IA 50118-0181
PO BOX 182, HARTFORD, IA 50118-0182
PO BOX 183, HARTFORD, IA 50118-0183
PO BOX 184, HARTFORD, IA 50118-0184
PO BOX 185, HARTFORD, IA 50118-0185
PO BOX 186, HARTFORD, IA 50118-0186
PO BOX 187, HARTFORD, IA 50118-0187
PO BOX 188, HARTFORD, IA 50118-0188
PO BOX 189, HARTFORD, IA 50118-0189
PO BOX 190, HARTFORD, IA 50118-0190
PO BOX 191, HARTFORD, IA 50118-0191
PO BOX 192, HARTFORD, IA 50118-0192
PO BOX 193, HARTFORD, IA 50118-0193
PO BOX 194, HARTFORD, IA 50118-0194
PO BOX 195, HARTFORD, IA 50118-0195
PO BOX 196, HARTFORD, IA 50118-0196
PO BOX 197, HARTFORD, IA 50118-0197
PO BOX 198, HARTFORD, IA 50118-0198
PO BOX 199, HARTFORD, IA 50118-0199
PO BOX 200, HARTFORD, IA 50118-0200
PO BOX 201, HARTFORD, IA 50118-0201
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