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, BISMARCK, ND 58502-0001
PO BOX 2, BISMARCK, ND 58502-0002
PO BOX 3, BISMARCK, ND 58502-0003
PO BOX 4, BISMARCK, ND 58502-0004
PO BOX 5, BISMARCK, ND 58502-0005
PO BOX 6, BISMARCK, ND 58502-0006
PO BOX 7, BISMARCK, ND 58502-0007
PO BOX 8, BISMARCK, ND 58502-0008
PO BOX 9, BISMARCK, ND 58502-0009
PO BOX 10, BISMARCK, ND 58502-0010
PO BOX 11, BISMARCK, ND 58502-0011
PO BOX 12, BISMARCK, ND 58502-0012
PO BOX 13, BISMARCK, ND 58502-0013
PO BOX 14, BISMARCK, ND 58502-0014
PO BOX 15, BISMARCK, ND 58502-0015
PO BOX 16, BISMARCK, ND 58502-0016
PO BOX 17, BISMARCK, ND 58502-0017
PO BOX 18, BISMARCK, ND 58502-0018
PO BOX 19, BISMARCK, ND 58502-0019
PO BOX 20, BISMARCK, ND 58502-0020
PO BOX 21, BISMARCK, ND 58502-0021
PO BOX 22, BISMARCK, ND 58502-0022
PO BOX 23, BISMARCK, ND 58502-0023
PO BOX 24, BISMARCK, ND 58502-0024
PO BOX 25, BISMARCK, ND 58502-0025
PO BOX 26, BISMARCK, ND 58502-0026
PO BOX 27, BISMARCK, ND 58502-0027
PO BOX 28, BISMARCK, ND 58502-0028
PO BOX 29, BISMARCK, ND 58502-0029
PO BOX 30, BISMARCK, ND 58502-0030
PO BOX 31, BISMARCK, ND 58502-0031
PO BOX 32, BISMARCK, ND 58502-0032
PO BOX 33, BISMARCK, ND 58502-0033
PO BOX 34, BISMARCK, ND 58502-0034
PO BOX 35, BISMARCK, ND 58502-0035
PO BOX 36, BISMARCK, ND 58502-0036
PO BOX 37, BISMARCK, ND 58502-0037
PO BOX 38, BISMARCK, ND 58502-0038
PO BOX 39, BISMARCK, ND 58502-0039
PO BOX 40, BISMARCK, ND 58502-0040
PO BOX 41, BISMARCK, ND 58502-0041
PO BOX 42, BISMARCK, ND 58502-0042
PO BOX 43, BISMARCK, ND 58502-0043
PO BOX 44, BISMARCK, ND 58502-0044
PO BOX 45, BISMARCK, ND 58502-0045
PO BOX 46, BISMARCK, ND 58502-0046
PO BOX 47, BISMARCK, ND 58502-0047
PO BOX 48, BISMARCK, ND 58502-0048
PO BOX 49, BISMARCK, ND 58502-0049
PO BOX 50, BISMARCK, ND 58502-0050
PO BOX 51, BISMARCK, ND 58502-0051
PO BOX 52, BISMARCK, ND 58502-0052
PO BOX 53, BISMARCK, ND 58502-0053
PO BOX 54, BISMARCK, ND 58502-0054
PO BOX 55, BISMARCK, ND 58502-0055
PO BOX 56, BISMARCK, ND 58502-0056
PO BOX 57, BISMARCK, ND 58502-0057
PO BOX 58, BISMARCK, ND 58502-0058
PO BOX 59, BISMARCK, ND 58502-0059
PO BOX 60, BISMARCK, ND 58502-0060
PO BOX 61, BISMARCK, ND 58502-0061
PO BOX 62, BISMARCK, ND 58502-0062
PO BOX 63, BISMARCK, ND 58502-0063
PO BOX 64, BISMARCK, ND 58502-0064
PO BOX 65, BISMARCK, ND 58502-0065
PO BOX 66, BISMARCK, ND 58502-0066
PO BOX 67, BISMARCK, ND 58502-0067
PO BOX 68, BISMARCK, ND 58502-0068
PO BOX 69, BISMARCK, ND 58502-0069
PO BOX 70, BISMARCK, ND 58502-0070
PO BOX 71, BISMARCK, ND 58502-0071
PO BOX 72, BISMARCK, ND 58502-0072
PO BOX 73, BISMARCK, ND 58502-0073
PO BOX 74, BISMARCK, ND 58502-0074
PO BOX 75, BISMARCK, ND 58502-0075
PO BOX 76, BISMARCK, ND 58502-0076
PO BOX 77, BISMARCK, ND 58502-0077
PO BOX 78, BISMARCK, ND 58502-0078
PO BOX 79, BISMARCK, ND 58502-0079
PO BOX 80, BISMARCK, ND 58502-0080
PO BOX 81, BISMARCK, ND 58502-0081
PO BOX 82, BISMARCK, ND 58502-0082
PO BOX 83, BISMARCK, ND 58502-0083
PO BOX 84, BISMARCK, ND 58502-0084
PO BOX 85, BISMARCK, ND 58502-0085
PO BOX 86, BISMARCK, ND 58502-0086
PO BOX 87, BISMARCK, ND 58502-0087
PO BOX 88, BISMARCK, ND 58502-0088
PO BOX 89, BISMARCK, ND 58502-0089
PO BOX 90, BISMARCK, ND 58502-0090
PO BOX 91, BISMARCK, ND 58502-0091
PO BOX 92, BISMARCK, ND 58502-0092
PO BOX 93, BISMARCK, ND 58502-0093
PO BOX 94, BISMARCK, ND 58502-0094
PO BOX 95, BISMARCK, ND 58502-0095
PO BOX 96, BISMARCK, ND 58502-0096
PO BOX 97, BISMARCK, ND 58502-0097
PO BOX 98, BISMARCK, ND 58502-0098
PO BOX 99, BISMARCK, ND 58502-0099
PO BOX 100, BISMARCK, ND 58502-0100
PO BOX 101, BISMARCK, ND 58502-0101
PO BOX 102, BISMARCK, ND 58502-0102
PO BOX 103, BISMARCK, ND 58502-0103
PO BOX 104, BISMARCK, ND 58502-0104
PO BOX 105, BISMARCK, ND 58502-0105
PO BOX 106, BISMARCK, ND 58502-0106
PO BOX 107, BISMARCK, ND 58502-0107
PO BOX 108, BISMARCK, ND 58502-0108
PO BOX 109, BISMARCK, ND 58502-0109
PO BOX 110, BISMARCK, ND 58502-0110
PO BOX 111, BISMARCK, ND 58502-0111
PO BOX 112, BISMARCK, ND 58502-0112
PO BOX 113, BISMARCK, ND 58502-0113
PO BOX 114, BISMARCK, ND 58502-0114
PO BOX 115, BISMARCK, ND 58502-0115
PO BOX 116, BISMARCK, ND 58502-0116
PO BOX 117, BISMARCK, ND 58502-0117
PO BOX 118, BISMARCK, ND 58502-0118
PO BOX 119, BISMARCK, ND 58502-0119
PO BOX 120, BISMARCK, ND 58502-0120
PO BOX 121, BISMARCK, ND 58502-0121
PO BOX 122, BISMARCK, ND 58502-0122
PO BOX 123, BISMARCK, ND 58502-0123
PO BOX 124, BISMARCK, ND 58502-0124
PO BOX 125, BISMARCK, ND 58502-0125
PO BOX 126, BISMARCK, ND 58502-0126
PO BOX 127, BISMARCK, ND 58502-0127
PO BOX 128, BISMARCK, ND 58502-0128
PO BOX 129, BISMARCK, ND 58502-0129
PO BOX 130, BISMARCK, ND 58502-0130
PO BOX 131, BISMARCK, ND 58502-0131
PO BOX 132, BISMARCK, ND 58502-0132
PO BOX 133, BISMARCK, ND 58502-0133
PO BOX 134, BISMARCK, ND 58502-0134
PO BOX 135, BISMARCK, ND 58502-0135
PO BOX 136, BISMARCK, ND 58502-0136
PO BOX 137, BISMARCK, ND 58502-0137
PO BOX 138, BISMARCK, ND 58502-0138
PO BOX 139, BISMARCK, ND 58502-0139
PO BOX 140, BISMARCK, ND 58502-0140
PO BOX 141, BISMARCK, ND 58502-0141
PO BOX 142, BISMARCK, ND 58502-0142
PO BOX 143, BISMARCK, ND 58502-0143
PO BOX 144, BISMARCK, ND 58502-0144
PO BOX 145, BISMARCK, ND 58502-0145
PO BOX 146, BISMARCK, ND 58502-0146
PO BOX 147, BISMARCK, ND 58502-0147
PO BOX 148, BISMARCK, ND 58502-0148
PO BOX 149, BISMARCK, ND 58502-0149
PO BOX 150, BISMARCK, ND 58502-0150
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