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, BLAIRSBURG, IA 50034-0001
PO BOX 2, BLAIRSBURG, IA 50034-0002
PO BOX 3, BLAIRSBURG, IA 50034-0003
PO BOX 4, BLAIRSBURG, IA 50034-0004
PO BOX 5, BLAIRSBURG, IA 50034-0005
PO BOX 6, BLAIRSBURG, IA 50034-0006
PO BOX 7, BLAIRSBURG, IA 50034-0007
PO BOX 8, BLAIRSBURG, IA 50034-0008
PO BOX 9, BLAIRSBURG, IA 50034-0009
PO BOX 10, BLAIRSBURG, IA 50034-0010
PO BOX 11, BLAIRSBURG, IA 50034-0011
PO BOX 12, BLAIRSBURG, IA 50034-0012
PO BOX 13, BLAIRSBURG, IA 50034-0013
PO BOX 14, BLAIRSBURG, IA 50034-0014
PO BOX 15, BLAIRSBURG, IA 50034-0015
PO BOX 16, BLAIRSBURG, IA 50034-0016
PO BOX 17, BLAIRSBURG, IA 50034-0017
PO BOX 18, BLAIRSBURG, IA 50034-0018
PO BOX 19, BLAIRSBURG, IA 50034-0019
PO BOX 20, BLAIRSBURG, IA 50034-0020
PO BOX 21, BLAIRSBURG, IA 50034-0021
PO BOX 22, BLAIRSBURG, IA 50034-0022
PO BOX 23, BLAIRSBURG, IA 50034-0023
PO BOX 24, BLAIRSBURG, IA 50034-0024
PO BOX 25, BLAIRSBURG, IA 50034-0025
PO BOX 26, BLAIRSBURG, IA 50034-0026
PO BOX 27, BLAIRSBURG, IA 50034-0027
PO BOX 28, BLAIRSBURG, IA 50034-0028
PO BOX 29, BLAIRSBURG, IA 50034-0029
PO BOX 30, BLAIRSBURG, IA 50034-0030
PO BOX 31, BLAIRSBURG, IA 50034-0031
PO BOX 32, BLAIRSBURG, IA 50034-0032
PO BOX 33, BLAIRSBURG, IA 50034-0033
PO BOX 34, BLAIRSBURG, IA 50034-0034
PO BOX 35, BLAIRSBURG, IA 50034-0035
PO BOX 36, BLAIRSBURG, IA 50034-0036
PO BOX 37, BLAIRSBURG, IA 50034-0037
PO BOX 38, BLAIRSBURG, IA 50034-0038
PO BOX 39, BLAIRSBURG, IA 50034-0039
PO BOX 40, BLAIRSBURG, IA 50034-0040
PO BOX 41, BLAIRSBURG, IA 50034-0041
PO BOX 42, BLAIRSBURG, IA 50034-0042
PO BOX 43, BLAIRSBURG, IA 50034-0043
PO BOX 44, BLAIRSBURG, IA 50034-0044
PO BOX 45, BLAIRSBURG, IA 50034-0045
PO BOX 46, BLAIRSBURG, IA 50034-0046
PO BOX 47, BLAIRSBURG, IA 50034-0047
PO BOX 48, BLAIRSBURG, IA 50034-0048
PO BOX 49, BLAIRSBURG, IA 50034-0049
PO BOX 50, BLAIRSBURG, IA 50034-0050
PO BOX 51, BLAIRSBURG, IA 50034-0051
PO BOX 52, BLAIRSBURG, IA 50034-0052
PO BOX 53, BLAIRSBURG, IA 50034-0053
PO BOX 54, BLAIRSBURG, IA 50034-0054
PO BOX 55, BLAIRSBURG, IA 50034-0055
PO BOX 56, BLAIRSBURG, IA 50034-0056
PO BOX 57, BLAIRSBURG, IA 50034-0057
PO BOX 58, BLAIRSBURG, IA 50034-0058
PO BOX 59, BLAIRSBURG, IA 50034-0059
PO BOX 60, BLAIRSBURG, IA 50034-0060
PO BOX 61, BLAIRSBURG, IA 50034-0061
PO BOX 62, BLAIRSBURG, IA 50034-0062
PO BOX 63, BLAIRSBURG, IA 50034-0063
PO BOX 64, BLAIRSBURG, IA 50034-0064
PO BOX 65, BLAIRSBURG, IA 50034-0065
PO BOX 66, BLAIRSBURG, IA 50034-0066
PO BOX 67, BLAIRSBURG, IA 50034-0067
PO BOX 68, BLAIRSBURG, IA 50034-0068
PO BOX 69, BLAIRSBURG, IA 50034-0069
PO BOX 70, BLAIRSBURG, IA 50034-0070
PO BOX 71, BLAIRSBURG, IA 50034-0071
PO BOX 72, BLAIRSBURG, IA 50034-0072
PO BOX 73, BLAIRSBURG, IA 50034-0073
PO BOX 74, BLAIRSBURG, IA 50034-0074
PO BOX 75, BLAIRSBURG, IA 50034-0075
PO BOX 76, BLAIRSBURG, IA 50034-0076
PO BOX 77, BLAIRSBURG, IA 50034-0077
PO BOX 78, BLAIRSBURG, IA 50034-0078
PO BOX 79, BLAIRSBURG, IA 50034-0079
PO BOX 80, BLAIRSBURG, IA 50034-0080
PO BOX 81, BLAIRSBURG, IA 50034-0081
PO BOX 82, BLAIRSBURG, IA 50034-0082
PO BOX 83, BLAIRSBURG, IA 50034-0083
PO BOX 84, BLAIRSBURG, IA 50034-0084
PO BOX 85, BLAIRSBURG, IA 50034-0085
PO BOX 86, BLAIRSBURG, IA 50034-0086
PO BOX 87, BLAIRSBURG, IA 50034-0087
PO BOX 88, BLAIRSBURG, IA 50034-0088
PO BOX 89, BLAIRSBURG, IA 50034-0089
PO BOX 90, BLAIRSBURG, IA 50034-0090
PO BOX 91, BLAIRSBURG, IA 50034-0091
PO BOX 92, BLAIRSBURG, IA 50034-0092
PO BOX 93, BLAIRSBURG, IA 50034-0093
PO BOX 94, BLAIRSBURG, IA 50034-0094
PO BOX 95, BLAIRSBURG, IA 50034-0095
PO BOX 96, BLAIRSBURG, IA 50034-0096
PO BOX 97, BLAIRSBURG, IA 50034-0097
PO BOX 98, BLAIRSBURG, IA 50034-0098
PO BOX 99, BLAIRSBURG, IA 50034-0099
PO BOX 100, BLAIRSBURG, IA 50034-0100
PO BOX 101, BLAIRSBURG, IA 50034-0101
PO BOX 102, BLAIRSBURG, IA 50034-0102
PO BOX 103, BLAIRSBURG, IA 50034-0103
PO BOX 104, BLAIRSBURG, IA 50034-0104
PO BOX 105, BLAIRSBURG, IA 50034-0105
PO BOX 106, BLAIRSBURG, IA 50034-0106
PO BOX 107, BLAIRSBURG, IA 50034-0107
PO BOX 108, BLAIRSBURG, IA 50034-0108
PO BOX 109, BLAIRSBURG, IA 50034-0109
PO BOX 110, BLAIRSBURG, IA 50034-0110
PO BOX 111, BLAIRSBURG, IA 50034-0111
PO BOX 112, BLAIRSBURG, IA 50034-0112
PO BOX 113, BLAIRSBURG, IA 50034-0113
PO BOX 114, BLAIRSBURG, IA 50034-0114
PO BOX 115, BLAIRSBURG, IA 50034-0115
PO BOX 116, BLAIRSBURG, IA 50034-0116
PO BOX 117, BLAIRSBURG, IA 50034-0117
PO BOX 118, BLAIRSBURG, IA 50034-0118
PO BOX 119, BLAIRSBURG, IA 50034-0119
PO BOX 120, BLAIRSBURG, IA 50034-0120
PO BOX 121, BLAIRSBURG, IA 50034-0121
PO BOX 122, BLAIRSBURG, IA 50034-0122
PO BOX 123, BLAIRSBURG, IA 50034-0123
PO BOX 124, BLAIRSBURG, IA 50034-0124
PO BOX 125, BLAIRSBURG, IA 50034-0125
PO BOX 126, BLAIRSBURG, IA 50034-0126
PO BOX 127, BLAIRSBURG, IA 50034-0127
PO BOX 128, BLAIRSBURG, IA 50034-0128
PO BOX 129, BLAIRSBURG, IA 50034-0129
PO BOX 130, BLAIRSBURG, IA 50034-0130
PO BOX 131, BLAIRSBURG, IA 50034-0131
PO BOX 132, BLAIRSBURG, IA 50034-0132
PO BOX 133, BLAIRSBURG, IA 50034-0133
PO BOX 134, BLAIRSBURG, IA 50034-0134
PO BOX 135, BLAIRSBURG, IA 50034-0135
PO BOX 136, BLAIRSBURG, IA 50034-0136
PO BOX 137, BLAIRSBURG, IA 50034-0137
PO BOX 138, BLAIRSBURG, IA 50034-0138
PO BOX 139, BLAIRSBURG, IA 50034-0139
PO BOX 140, BLAIRSBURG, IA 50034-0140
PO BOX 141, BLAIRSBURG, IA 50034-0141
PO BOX 142, BLAIRSBURG, IA 50034-0142
PO BOX 143, BLAIRSBURG, IA 50034-0143
PO BOX 144, BLAIRSBURG, IA 50034-0144
PO BOX 145, BLAIRSBURG, IA 50034-0145
PO BOX 146, BLAIRSBURG, IA 50034-0146
PO BOX 147, BLAIRSBURG, IA 50034-0147
PO BOX 148, BLAIRSBURG, IA 50034-0148
PO BOX 149, BLAIRSBURG, IA 50034-0149
PO BOX 150, BLAIRSBURG, IA 50034-0150
PO BOX 151, BLAIRSBURG, IA 50034-0151
PO BOX 152, BLAIRSBURG, IA 50034-0152
PO BOX 153, BLAIRSBURG, IA 50034-0153
PO BOX 154, BLAIRSBURG, IA 50034-0154
PO BOX 155, BLAIRSBURG, IA 50034-0155
PO BOX 156, BLAIRSBURG, IA 50034-0156
PO BOX 157, BLAIRSBURG, IA 50034-0157
PO BOX 158, BLAIRSBURG, IA 50034-0158
PO BOX 159, BLAIRSBURG, IA 50034-0159
PO BOX 160, BLAIRSBURG, IA 50034-0160
PO BOX 161, BLAIRSBURG, IA 50034-0161
PO BOX 162, BLAIRSBURG, IA 50034-0162
PO BOX 163, BLAIRSBURG, IA 50034-0163
PO BOX 164, BLAIRSBURG, IA 50034-0164
PO BOX 165, BLAIRSBURG, IA 50034-0165
PO BOX 166, BLAIRSBURG, IA 50034-0166
PO BOX 167, BLAIRSBURG, IA 50034-0167
PO BOX 168, BLAIRSBURG, IA 50034-0168
PO BOX 169, BLAIRSBURG, IA 50034-0169
PO BOX 170, BLAIRSBURG, IA 50034-0170
PO BOX 171, BLAIRSBURG, IA 50034-0171
PO BOX 172, BLAIRSBURG, IA 50034-0172
PO BOX 173, BLAIRSBURG, IA 50034-0173
PO BOX 174, BLAIRSBURG, IA 50034-0174
PO BOX 175, BLAIRSBURG, IA 50034-0175
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