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, SCRANTON, IA 51462-0001
PO BOX 2, SCRANTON, IA 51462-0002
PO BOX 3, SCRANTON, IA 51462-0003
PO BOX 4, SCRANTON, IA 51462-0004
PO BOX 5, SCRANTON, IA 51462-0005
PO BOX 6, SCRANTON, IA 51462-0006
PO BOX 7, SCRANTON, IA 51462-0007
PO BOX 8, SCRANTON, IA 51462-0008
PO BOX 9, SCRANTON, IA 51462-0009
PO BOX 10, SCRANTON, IA 51462-0010
PO BOX 11, SCRANTON, IA 51462-0011
PO BOX 12, SCRANTON, IA 51462-0012
PO BOX 13, SCRANTON, IA 51462-0013
PO BOX 14, SCRANTON, IA 51462-0014
PO BOX 15, SCRANTON, IA 51462-0015
PO BOX 16, SCRANTON, IA 51462-0016
PO BOX 17, SCRANTON, IA 51462-0017
PO BOX 18, SCRANTON, IA 51462-0018
PO BOX 19, SCRANTON, IA 51462-0019
PO BOX 20, SCRANTON, IA 51462-0020
PO BOX 21, SCRANTON, IA 51462-0021
PO BOX 22, SCRANTON, IA 51462-0022
PO BOX 23, SCRANTON, IA 51462-0023
PO BOX 24, SCRANTON, IA 51462-0024
PO BOX 25, SCRANTON, IA 51462-0025
PO BOX 26, SCRANTON, IA 51462-0026
PO BOX 27, SCRANTON, IA 51462-0027
PO BOX 28, SCRANTON, IA 51462-0028
PO BOX 29, SCRANTON, IA 51462-0029
PO BOX 30, SCRANTON, IA 51462-0030
PO BOX 31, SCRANTON, IA 51462-0031
PO BOX 32, SCRANTON, IA 51462-0032
PO BOX 33, SCRANTON, IA 51462-0033
PO BOX 34, SCRANTON, IA 51462-0034
PO BOX 35, SCRANTON, IA 51462-0035
PO BOX 36, SCRANTON, IA 51462-0036
PO BOX 37, SCRANTON, IA 51462-0037
PO BOX 38, SCRANTON, IA 51462-0038
PO BOX 39, SCRANTON, IA 51462-0039
PO BOX 40, SCRANTON, IA 51462-0040
PO BOX 41, SCRANTON, IA 51462-0041
PO BOX 42, SCRANTON, IA 51462-0042
PO BOX 43, SCRANTON, IA 51462-0043
PO BOX 44, SCRANTON, IA 51462-0044
PO BOX 45, SCRANTON, IA 51462-0045
PO BOX 46, SCRANTON, IA 51462-0046
PO BOX 47, SCRANTON, IA 51462-0047
PO BOX 48, SCRANTON, IA 51462-0048
PO BOX 49, SCRANTON, IA 51462-0049
PO BOX 50, SCRANTON, IA 51462-0050
PO BOX 51, SCRANTON, IA 51462-0051
PO BOX 52, SCRANTON, IA 51462-0052
PO BOX 53, SCRANTON, IA 51462-0053
PO BOX 54, SCRANTON, IA 51462-0054
PO BOX 55, SCRANTON, IA 51462-0055
PO BOX 56, SCRANTON, IA 51462-0056
PO BOX 57, SCRANTON, IA 51462-0057
PO BOX 58, SCRANTON, IA 51462-0058
PO BOX 59, SCRANTON, IA 51462-0059
PO BOX 60, SCRANTON, IA 51462-0060
PO BOX 61, SCRANTON, IA 51462-0061
PO BOX 62, SCRANTON, IA 51462-0062
PO BOX 63, SCRANTON, IA 51462-0063
PO BOX 64, SCRANTON, IA 51462-0064
PO BOX 65, SCRANTON, IA 51462-0065
PO BOX 66, SCRANTON, IA 51462-0066
PO BOX 67, SCRANTON, IA 51462-0067
PO BOX 68, SCRANTON, IA 51462-0068
PO BOX 69, SCRANTON, IA 51462-0069
PO BOX 70, SCRANTON, IA 51462-0070
PO BOX 71, SCRANTON, IA 51462-0071
PO BOX 72, SCRANTON, IA 51462-0072
PO BOX 73, SCRANTON, IA 51462-0073
PO BOX 74, SCRANTON, IA 51462-0074
PO BOX 75, SCRANTON, IA 51462-0075
PO BOX 76, SCRANTON, IA 51462-0076
PO BOX 77, SCRANTON, IA 51462-0077
PO BOX 78, SCRANTON, IA 51462-0078
PO BOX 79, SCRANTON, IA 51462-0079
PO BOX 80, SCRANTON, IA 51462-0080
PO BOX 81, SCRANTON, IA 51462-0081
PO BOX 82, SCRANTON, IA 51462-0082
PO BOX 83, SCRANTON, IA 51462-0083
PO BOX 84, SCRANTON, IA 51462-0084
PO BOX 85, SCRANTON, IA 51462-0085
PO BOX 86, SCRANTON, IA 51462-0086
PO BOX 87, SCRANTON, IA 51462-0087
PO BOX 88, SCRANTON, IA 51462-0088
PO BOX 89, SCRANTON, IA 51462-0089
PO BOX 90, SCRANTON, IA 51462-0090
PO BOX 91, SCRANTON, IA 51462-0091
PO BOX 92, SCRANTON, IA 51462-0092
PO BOX 93, SCRANTON, IA 51462-0093
PO BOX 94, SCRANTON, IA 51462-0094
PO BOX 95, SCRANTON, IA 51462-0095
PO BOX 96, SCRANTON, IA 51462-0096
PO BOX 97, SCRANTON, IA 51462-0097
PO BOX 98, SCRANTON, IA 51462-0098
PO BOX 99, SCRANTON, IA 51462-0099
PO BOX 100, SCRANTON, IA 51462-0100
PO BOX 101, SCRANTON, IA 51462-0101
PO BOX 102, SCRANTON, IA 51462-0102
PO BOX 103, SCRANTON, IA 51462-0103
PO BOX 104, SCRANTON, IA 51462-0104
PO BOX 105, SCRANTON, IA 51462-0105
PO BOX 106, SCRANTON, IA 51462-0106
PO BOX 107, SCRANTON, IA 51462-0107
PO BOX 108, SCRANTON, IA 51462-0108
PO BOX 109, SCRANTON, IA 51462-0109
PO BOX 110, SCRANTON, IA 51462-0110
PO BOX 111, SCRANTON, IA 51462-0111
PO BOX 112, SCRANTON, IA 51462-0112
PO BOX 113, SCRANTON, IA 51462-0113
PO BOX 114, SCRANTON, IA 51462-0114
PO BOX 115, SCRANTON, IA 51462-0115
PO BOX 116, SCRANTON, IA 51462-0116
PO BOX 117, SCRANTON, IA 51462-0117
PO BOX 118, SCRANTON, IA 51462-0118
PO BOX 119, SCRANTON, IA 51462-0119
PO BOX 120, SCRANTON, IA 51462-0120
PO BOX 121, SCRANTON, IA 51462-0121
PO BOX 122, SCRANTON, IA 51462-0122
PO BOX 123, SCRANTON, IA 51462-0123
PO BOX 124, SCRANTON, IA 51462-0124
PO BOX 125, SCRANTON, IA 51462-0125
PO BOX 126, SCRANTON, IA 51462-0126
PO BOX 127, SCRANTON, IA 51462-0127
PO BOX 128, SCRANTON, IA 51462-0128
PO BOX 129, SCRANTON, IA 51462-0129
PO BOX 130, SCRANTON, IA 51462-0130
PO BOX 131, SCRANTON, IA 51462-0131
PO BOX 132, SCRANTON, IA 51462-0132
PO BOX 133, SCRANTON, IA 51462-0133
PO BOX 134, SCRANTON, IA 51462-0134
PO BOX 135, SCRANTON, IA 51462-0135
PO BOX 136, SCRANTON, IA 51462-0136
PO BOX 137, SCRANTON, IA 51462-0137
PO BOX 138, SCRANTON, IA 51462-0138
PO BOX 139, SCRANTON, IA 51462-0139
PO BOX 140, SCRANTON, IA 51462-0140
PO BOX 141, SCRANTON, IA 51462-0141
PO BOX 142, SCRANTON, IA 51462-0142
PO BOX 143, SCRANTON, IA 51462-0143
PO BOX 144, SCRANTON, IA 51462-0144
PO BOX 145, SCRANTON, IA 51462-0145
PO BOX 146, SCRANTON, IA 51462-0146
PO BOX 147, SCRANTON, IA 51462-0147
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