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, HUMBOLDT, IA 50548-0001
PO BOX 2, HUMBOLDT, IA 50548-0002
PO BOX 3, HUMBOLDT, IA 50548-0003
PO BOX 4, HUMBOLDT, IA 50548-0004
PO BOX 5, HUMBOLDT, IA 50548-0005
PO BOX 6, HUMBOLDT, IA 50548-0006
PO BOX 7, HUMBOLDT, IA 50548-0007
PO BOX 8, HUMBOLDT, IA 50548-0008
PO BOX 9, HUMBOLDT, IA 50548-0009
PO BOX 10, HUMBOLDT, IA 50548-0010
PO BOX 11, HUMBOLDT, IA 50548-0011
PO BOX 12, HUMBOLDT, IA 50548-0012
PO BOX 13, HUMBOLDT, IA 50548-0013
PO BOX 14, HUMBOLDT, IA 50548-0014
PO BOX 15, HUMBOLDT, IA 50548-0015
PO BOX 16, HUMBOLDT, IA 50548-0016
PO BOX 17, HUMBOLDT, IA 50548-0017
PO BOX 18, HUMBOLDT, IA 50548-0018
PO BOX 19, HUMBOLDT, IA 50548-0019
PO BOX 20, HUMBOLDT, IA 50548-0020
PO BOX 21, HUMBOLDT, IA 50548-0021
PO BOX 22, HUMBOLDT, IA 50548-0022
PO BOX 23, HUMBOLDT, IA 50548-0023
PO BOX 24, HUMBOLDT, IA 50548-0024
PO BOX 25, HUMBOLDT, IA 50548-0025
PO BOX 26, HUMBOLDT, IA 50548-0026
PO BOX 27, HUMBOLDT, IA 50548-0027
PO BOX 28, HUMBOLDT, IA 50548-0028
PO BOX 29, HUMBOLDT, IA 50548-0029
PO BOX 30, HUMBOLDT, IA 50548-0030
PO BOX 31, HUMBOLDT, IA 50548-0031
PO BOX 32, HUMBOLDT, IA 50548-0032
PO BOX 33, HUMBOLDT, IA 50548-0033
PO BOX 34, HUMBOLDT, IA 50548-0034
PO BOX 35, HUMBOLDT, IA 50548-0035
PO BOX 36, HUMBOLDT, IA 50548-0036
PO BOX 37, HUMBOLDT, IA 50548-0037
PO BOX 38, HUMBOLDT, IA 50548-0038
PO BOX 39, HUMBOLDT, IA 50548-0039
PO BOX 40, HUMBOLDT, IA 50548-0040
PO BOX 41, HUMBOLDT, IA 50548-0041
PO BOX 42, HUMBOLDT, IA 50548-0042
PO BOX 43, HUMBOLDT, IA 50548-0043
PO BOX 44, HUMBOLDT, IA 50548-0044
PO BOX 45, HUMBOLDT, IA 50548-0045
PO BOX 46, HUMBOLDT, IA 50548-0046
PO BOX 47, HUMBOLDT, IA 50548-0047
PO BOX 48, HUMBOLDT, IA 50548-0048
PO BOX 49, HUMBOLDT, IA 50548-0049
PO BOX 50, HUMBOLDT, IA 50548-0050
PO BOX 51, HUMBOLDT, IA 50548-0051
PO BOX 52, HUMBOLDT, IA 50548-0052
PO BOX 53, HUMBOLDT, IA 50548-0053
PO BOX 54, HUMBOLDT, IA 50548-0054
PO BOX 55, HUMBOLDT, IA 50548-0055
PO BOX 56, HUMBOLDT, IA 50548-0056
PO BOX 57, HUMBOLDT, IA 50548-0057
PO BOX 58, HUMBOLDT, IA 50548-0058
PO BOX 59, HUMBOLDT, IA 50548-0059
PO BOX 60, HUMBOLDT, IA 50548-0060
PO BOX 61, HUMBOLDT, IA 50548-0061
PO BOX 62, HUMBOLDT, IA 50548-0062
PO BOX 63, HUMBOLDT, IA 50548-0063
PO BOX 64, HUMBOLDT, IA 50548-0064
PO BOX 65, HUMBOLDT, IA 50548-0065
PO BOX 66, HUMBOLDT, IA 50548-0066
PO BOX 67, HUMBOLDT, IA 50548-0067
PO BOX 68, HUMBOLDT, IA 50548-0068
PO BOX 69, HUMBOLDT, IA 50548-0069
PO BOX 70, HUMBOLDT, IA 50548-0070
PO BOX 71, HUMBOLDT, IA 50548-0071
PO BOX 72, HUMBOLDT, IA 50548-0072
PO BOX 73, HUMBOLDT, IA 50548-0073
PO BOX 74, HUMBOLDT, IA 50548-0074
PO BOX 75, HUMBOLDT, IA 50548-0075
PO BOX 76, HUMBOLDT, IA 50548-0076
PO BOX 77, HUMBOLDT, IA 50548-0077
PO BOX 78, HUMBOLDT, IA 50548-0078
PO BOX 79, HUMBOLDT, IA 50548-0079
PO BOX 80, HUMBOLDT, IA 50548-0080
PO BOX 81, HUMBOLDT, IA 50548-0081
PO BOX 82, HUMBOLDT, IA 50548-0082
PO BOX 83, HUMBOLDT, IA 50548-0083
PO BOX 84, HUMBOLDT, IA 50548-0084
PO BOX 85, HUMBOLDT, IA 50548-0085
PO BOX 86, HUMBOLDT, IA 50548-0086
PO BOX 87, HUMBOLDT, IA 50548-0087
PO BOX 88, HUMBOLDT, IA 50548-0088
PO BOX 89, HUMBOLDT, IA 50548-0089
PO BOX 90, HUMBOLDT, IA 50548-0090
PO BOX 91, HUMBOLDT, IA 50548-0091
PO BOX 92, HUMBOLDT, IA 50548-0092
PO BOX 93, HUMBOLDT, IA 50548-0093
PO BOX 94, HUMBOLDT, IA 50548-0094
PO BOX 95, HUMBOLDT, IA 50548-0095
PO BOX 96, HUMBOLDT, IA 50548-0096
PO BOX 97, HUMBOLDT, IA 50548-0097
PO BOX 98, HUMBOLDT, IA 50548-0098
PO BOX 99, HUMBOLDT, IA 50548-0099
PO BOX 100, HUMBOLDT, IA 50548-0100
PO BOX 101, HUMBOLDT, IA 50548-0101
PO BOX 102, HUMBOLDT, IA 50548-0102
PO BOX 103, HUMBOLDT, IA 50548-0103
PO BOX 104, HUMBOLDT, IA 50548-0104
PO BOX 105, HUMBOLDT, IA 50548-0105
PO BOX 106, HUMBOLDT, IA 50548-0106
PO BOX 107, HUMBOLDT, IA 50548-0107
PO BOX 108, HUMBOLDT, IA 50548-0108
PO BOX 109, HUMBOLDT, IA 50548-0109
PO BOX 110, HUMBOLDT, IA 50548-0110
PO BOX 111, HUMBOLDT, IA 50548-0111
PO BOX 112, HUMBOLDT, IA 50548-0112
PO BOX 113, HUMBOLDT, IA 50548-0113
PO BOX 114, HUMBOLDT, IA 50548-0114
PO BOX 115, HUMBOLDT, IA 50548-0115
PO BOX 116, HUMBOLDT, IA 50548-0116
PO BOX 117, HUMBOLDT, IA 50548-0117
PO BOX 118, HUMBOLDT, IA 50548-0118
PO BOX 119, HUMBOLDT, IA 50548-0119
PO BOX 120, HUMBOLDT, IA 50548-0120
PO BOX 121, HUMBOLDT, IA 50548-0121
PO BOX 122, HUMBOLDT, IA 50548-0122
PO BOX 123, HUMBOLDT, IA 50548-0123
PO BOX 124, HUMBOLDT, IA 50548-0124
PO BOX 125, HUMBOLDT, IA 50548-0125
PO BOX 126, HUMBOLDT, IA 50548-0126
PO BOX 127, HUMBOLDT, IA 50548-0127
PO BOX 128, HUMBOLDT, IA 50548-0128
PO BOX 129, HUMBOLDT, IA 50548-0129
PO BOX 130, HUMBOLDT, IA 50548-0130
PO BOX 131, HUMBOLDT, IA 50548-0131
PO BOX 132, HUMBOLDT, IA 50548-0132
PO BOX 133, HUMBOLDT, IA 50548-0133
PO BOX 134, HUMBOLDT, IA 50548-0134
PO BOX 135, HUMBOLDT, IA 50548-0135
PO BOX 136, HUMBOLDT, IA 50548-0136
PO BOX 137, HUMBOLDT, IA 50548-0137
PO BOX 138, HUMBOLDT, IA 50548-0138
PO BOX 139, HUMBOLDT, IA 50548-0139
PO BOX 140, HUMBOLDT, IA 50548-0140
PO BOX 141, HUMBOLDT, IA 50548-0141
PO BOX 142, HUMBOLDT, IA 50548-0142
PO BOX 143, HUMBOLDT, IA 50548-0143
PO BOX 144, HUMBOLDT, IA 50548-0144
PO BOX 145, HUMBOLDT, IA 50548-0145
PO BOX 146, HUMBOLDT, IA 50548-0146
PO BOX 147, HUMBOLDT, IA 50548-0147
PO BOX 148, HUMBOLDT, IA 50548-0148
PO BOX 149, HUMBOLDT, IA 50548-0149
PO BOX 150, HUMBOLDT, IA 50548-0150
PO BOX 151, HUMBOLDT, IA 50548-0151
PO BOX 152, HUMBOLDT, IA 50548-0152
PO BOX 153, HUMBOLDT, IA 50548-0153
PO BOX 154, HUMBOLDT, IA 50548-0154
PO BOX 155, HUMBOLDT, IA 50548-0155
PO BOX 156, HUMBOLDT, IA 50548-0156
PO BOX 157, HUMBOLDT, IA 50548-0157
PO BOX 158, HUMBOLDT, IA 50548-0158
PO BOX 159, HUMBOLDT, IA 50548-0159
PO BOX 160, HUMBOLDT, IA 50548-0160
PO BOX 161, HUMBOLDT, IA 50548-0161
PO BOX 162, HUMBOLDT, IA 50548-0162
PO BOX 163, HUMBOLDT, IA 50548-0163
PO BOX 164, HUMBOLDT, IA 50548-0164
PO BOX 165, HUMBOLDT, IA 50548-0165
PO BOX 166, HUMBOLDT, IA 50548-0166
PO BOX 167, HUMBOLDT, IA 50548-0167
PO BOX 168, HUMBOLDT, IA 50548-0168
PO BOX 169, HUMBOLDT, IA 50548-0169
PO BOX 170, HUMBOLDT, IA 50548-0170
PO BOX 171, HUMBOLDT, IA 50548-0171
PO BOX 172, HUMBOLDT, IA 50548-0172
PO BOX 173, HUMBOLDT, IA 50548-0173
PO BOX 174, HUMBOLDT, IA 50548-0174
PO BOX 175, HUMBOLDT, IA 50548-0175
PO BOX 176, HUMBOLDT, IA 50548-0176
PO BOX 177, HUMBOLDT, IA 50548-0177
PO BOX 178, HUMBOLDT, IA 50548-0178
PO BOX 179, HUMBOLDT, IA 50548-0179
PO BOX 180, HUMBOLDT, IA 50548-0180
PO BOX 181, HUMBOLDT, IA 50548-0181
PO BOX 182, HUMBOLDT, IA 50548-0182
PO BOX 183, HUMBOLDT, IA 50548-0183
PO BOX 184, HUMBOLDT, IA 50548-0184
PO BOX 185, HUMBOLDT, IA 50548-0185
PO BOX 186, HUMBOLDT, IA 50548-0186
PO BOX 187, HUMBOLDT, IA 50548-0187
PO BOX 188, HUMBOLDT, IA 50548-0188
PO BOX 189, HUMBOLDT, IA 50548-0189
PO BOX 190, HUMBOLDT, IA 50548-0190
PO BOX 191, HUMBOLDT, IA 50548-0191
PO BOX 192, HUMBOLDT, IA 50548-0192
PO BOX 193, HUMBOLDT, IA 50548-0193
PO BOX 194, HUMBOLDT, IA 50548-0194
PO BOX 195, HUMBOLDT, IA 50548-0195
PO BOX 196, HUMBOLDT, IA 50548-0196
PO BOX 197, HUMBOLDT, IA 50548-0197
PO BOX 198, HUMBOLDT, IA 50548-0198
PO BOX 199, HUMBOLDT, IA 50548-0199
PO BOX 200, HUMBOLDT, IA 50548-0200
PO BOX 201, HUMBOLDT, IA 50548-0201
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