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, SUPERIOR, MT 59872-0001
PO BOX 2, SUPERIOR, MT 59872-0002
PO BOX 3, SUPERIOR, MT 59872-0003
PO BOX 4, SUPERIOR, MT 59872-0004
PO BOX 5, SUPERIOR, MT 59872-0005
PO BOX 6, SUPERIOR, MT 59872-0006
PO BOX 7, SUPERIOR, MT 59872-0007
PO BOX 8, SUPERIOR, MT 59872-0008
PO BOX 9, SUPERIOR, MT 59872-0009
PO BOX 10, SUPERIOR, MT 59872-0010
PO BOX 11, SUPERIOR, MT 59872-0011
PO BOX 12, SUPERIOR, MT 59872-0012
PO BOX 13, SUPERIOR, MT 59872-0013
PO BOX 14, SUPERIOR, MT 59872-0014
PO BOX 15, SUPERIOR, MT 59872-0015
PO BOX 16, SUPERIOR, MT 59872-0016
PO BOX 17, SUPERIOR, MT 59872-0017
PO BOX 18, SUPERIOR, MT 59872-0018
PO BOX 19, SUPERIOR, MT 59872-0019
PO BOX 20, SUPERIOR, MT 59872-0020
PO BOX 21, SUPERIOR, MT 59872-0021
PO BOX 22, SUPERIOR, MT 59872-0022
PO BOX 23, SUPERIOR, MT 59872-0023
PO BOX 24, SUPERIOR, MT 59872-0024
PO BOX 25, SUPERIOR, MT 59872-0025
PO BOX 26, SUPERIOR, MT 59872-0026
PO BOX 27, SUPERIOR, MT 59872-0027
PO BOX 28, SUPERIOR, MT 59872-0028
PO BOX 29, SUPERIOR, MT 59872-0029
PO BOX 30, SUPERIOR, MT 59872-0030
PO BOX 31, SUPERIOR, MT 59872-0031
PO BOX 32, SUPERIOR, MT 59872-0032
PO BOX 33, SUPERIOR, MT 59872-0033
PO BOX 34, SUPERIOR, MT 59872-0034
PO BOX 35, SUPERIOR, MT 59872-0035
PO BOX 36, SUPERIOR, MT 59872-0036
PO BOX 37, SUPERIOR, MT 59872-0037
PO BOX 38, SUPERIOR, MT 59872-0038
PO BOX 39, SUPERIOR, MT 59872-0039
PO BOX 40, SUPERIOR, MT 59872-0040
PO BOX 41, SUPERIOR, MT 59872-0041
PO BOX 42, SUPERIOR, MT 59872-0042
PO BOX 43, SUPERIOR, MT 59872-0043
PO BOX 44, SUPERIOR, MT 59872-0044
PO BOX 45, SUPERIOR, MT 59872-0045
PO BOX 46, SUPERIOR, MT 59872-0046
PO BOX 47, SUPERIOR, MT 59872-0047
PO BOX 48, SUPERIOR, MT 59872-0048
PO BOX 49, SUPERIOR, MT 59872-0049
PO BOX 50, SUPERIOR, MT 59872-0050
PO BOX 51, SUPERIOR, MT 59872-0051
PO BOX 52, SUPERIOR, MT 59872-0052
PO BOX 53, SUPERIOR, MT 59872-0053
PO BOX 54, SUPERIOR, MT 59872-0054
PO BOX 55, SUPERIOR, MT 59872-0055
PO BOX 56, SUPERIOR, MT 59872-0056
PO BOX 57, SUPERIOR, MT 59872-0057
PO BOX 58, SUPERIOR, MT 59872-0058
PO BOX 59, SUPERIOR, MT 59872-0059
PO BOX 60, SUPERIOR, MT 59872-0060
PO BOX 61, SUPERIOR, MT 59872-0061
PO BOX 62, SUPERIOR, MT 59872-0062
PO BOX 63, SUPERIOR, MT 59872-0063
PO BOX 64, SUPERIOR, MT 59872-0064
PO BOX 65, SUPERIOR, MT 59872-0065
PO BOX 66, SUPERIOR, MT 59872-0066
PO BOX 67, SUPERIOR, MT 59872-0067
PO BOX 68, SUPERIOR, MT 59872-0068
PO BOX 69, SUPERIOR, MT 59872-0069
PO BOX 70, SUPERIOR, MT 59872-0070
PO BOX 71, SUPERIOR, MT 59872-0071
PO BOX 72, SUPERIOR, MT 59872-0072
PO BOX 73, SUPERIOR, MT 59872-0073
PO BOX 74, SUPERIOR, MT 59872-0074
PO BOX 75, SUPERIOR, MT 59872-0075
PO BOX 76, SUPERIOR, MT 59872-0076
PO BOX 77, SUPERIOR, MT 59872-0077
PO BOX 78, SUPERIOR, MT 59872-0078
PO BOX 79, SUPERIOR, MT 59872-0079
PO BOX 80, SUPERIOR, MT 59872-0080
PO BOX 81, SUPERIOR, MT 59872-0081
PO BOX 82, SUPERIOR, MT 59872-0082
PO BOX 83, SUPERIOR, MT 59872-0083
PO BOX 84, SUPERIOR, MT 59872-0084
PO BOX 85, SUPERIOR, MT 59872-0085
PO BOX 86, SUPERIOR, MT 59872-0086
PO BOX 87, SUPERIOR, MT 59872-0087
PO BOX 88, SUPERIOR, MT 59872-0088
PO BOX 89, SUPERIOR, MT 59872-0089
PO BOX 90, SUPERIOR, MT 59872-0090
PO BOX 91, SUPERIOR, MT 59872-0091
PO BOX 92, SUPERIOR, MT 59872-0092
PO BOX 93, SUPERIOR, MT 59872-0093
PO BOX 94, SUPERIOR, MT 59872-0094
PO BOX 95, SUPERIOR, MT 59872-0095
PO BOX 96, SUPERIOR, MT 59872-0096
PO BOX 97, SUPERIOR, MT 59872-0097
PO BOX 98, SUPERIOR, MT 59872-0098
PO BOX 99, SUPERIOR, MT 59872-0099
PO BOX 100, SUPERIOR, MT 59872-0100
PO BOX 101, SUPERIOR, MT 59872-0101
PO BOX 102, SUPERIOR, MT 59872-0102
PO BOX 103, SUPERIOR, MT 59872-0103
PO BOX 104, SUPERIOR, MT 59872-0104
PO BOX 105, SUPERIOR, MT 59872-0105
PO BOX 106, SUPERIOR, MT 59872-0106
PO BOX 107, SUPERIOR, MT 59872-0107
PO BOX 108, SUPERIOR, MT 59872-0108
PO BOX 109, SUPERIOR, MT 59872-0109
PO BOX 110, SUPERIOR, MT 59872-0110
PO BOX 111, SUPERIOR, MT 59872-0111
PO BOX 112, SUPERIOR, MT 59872-0112
PO BOX 113, SUPERIOR, MT 59872-0113
PO BOX 114, SUPERIOR, MT 59872-0114
PO BOX 115, SUPERIOR, MT 59872-0115
PO BOX 116, SUPERIOR, MT 59872-0116
PO BOX 117, SUPERIOR, MT 59872-0117
PO BOX 118, SUPERIOR, MT 59872-0118
PO BOX 119, SUPERIOR, MT 59872-0119
PO BOX 120, SUPERIOR, MT 59872-0120
PO BOX 121, SUPERIOR, MT 59872-0121
PO BOX 122, SUPERIOR, MT 59872-0122
PO BOX 123, SUPERIOR, MT 59872-0123
PO BOX 124, SUPERIOR, MT 59872-0124
PO BOX 125, SUPERIOR, MT 59872-0125
PO BOX 126, SUPERIOR, MT 59872-0126
PO BOX 127, SUPERIOR, MT 59872-0127
PO BOX 128, SUPERIOR, MT 59872-0128
PO BOX 129, SUPERIOR, MT 59872-0129
PO BOX 130, SUPERIOR, MT 59872-0130
PO BOX 131, SUPERIOR, MT 59872-0131
PO BOX 132, SUPERIOR, MT 59872-0132
PO BOX 133, SUPERIOR, MT 59872-0133
PO BOX 134, SUPERIOR, MT 59872-0134
PO BOX 135, SUPERIOR, MT 59872-0135
PO BOX 136, SUPERIOR, MT 59872-0136
PO BOX 137, SUPERIOR, MT 59872-0137
PO BOX 138, SUPERIOR, MT 59872-0138
PO BOX 139, SUPERIOR, MT 59872-0139
PO BOX 140, SUPERIOR, MT 59872-0140
PO BOX 141, SUPERIOR, MT 59872-0141
PO BOX 142, SUPERIOR, MT 59872-0142
PO BOX 143, SUPERIOR, MT 59872-0143
PO BOX 144, SUPERIOR, MT 59872-0144
PO BOX 145, SUPERIOR, MT 59872-0145
PO BOX 146, SUPERIOR, MT 59872-0146
PO BOX 147, SUPERIOR, MT 59872-0147
PO BOX 148, SUPERIOR, MT 59872-0148
PO BOX 149, SUPERIOR, MT 59872-0149
PO BOX 150, SUPERIOR, MT 59872-0150
PO BOX 151, SUPERIOR, MT 59872-0151
PO BOX 152, SUPERIOR, MT 59872-0152
PO BOX 153, SUPERIOR, MT 59872-0153
PO BOX 154, SUPERIOR, MT 59872-0154
PO BOX 155, SUPERIOR, MT 59872-0155
PO BOX 156, SUPERIOR, MT 59872-0156
PO BOX 157, SUPERIOR, MT 59872-0157
PO BOX 158, SUPERIOR, MT 59872-0158
PO BOX 159, SUPERIOR, MT 59872-0159
PO BOX 160, SUPERIOR, MT 59872-0160
PO BOX 161, SUPERIOR, MT 59872-0161
PO BOX 162, SUPERIOR, MT 59872-0162
PO BOX 163, SUPERIOR, MT 59872-0163
PO BOX 164, SUPERIOR, MT 59872-0164
PO BOX 165, SUPERIOR, MT 59872-0165
PO BOX 166, SUPERIOR, MT 59872-0166
PO BOX 167, SUPERIOR, MT 59872-0167
PO BOX 168, SUPERIOR, MT 59872-0168
PO BOX 169, SUPERIOR, MT 59872-0169
PO BOX 170, SUPERIOR, MT 59872-0170
PO BOX 171, SUPERIOR, MT 59872-0171
PO BOX 172, SUPERIOR, MT 59872-0172
PO BOX 173, SUPERIOR, MT 59872-0173
PO BOX 174, SUPERIOR, MT 59872-0174
PO BOX 175, SUPERIOR, MT 59872-0175
PO BOX 176, SUPERIOR, MT 59872-0176
PO BOX 177, SUPERIOR, MT 59872-0177
PO BOX 178, SUPERIOR, MT 59872-0178
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