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 11, BUFFALO, ND 58011-0011
PO BOX 12, BUFFALO, ND 58011-0012
PO BOX 13, BUFFALO, ND 58011-0013
PO BOX 14, BUFFALO, ND 58011-0014
PO BOX 15, BUFFALO, ND 58011-0015
PO BOX 16, BUFFALO, ND 58011-0016
PO BOX 17, BUFFALO, ND 58011-0017
PO BOX 18, BUFFALO, ND 58011-0018
PO BOX 19, BUFFALO, ND 58011-0019
PO BOX 20, BUFFALO, ND 58011-0020
PO BOX 21, BUFFALO, ND 58011-0021
PO BOX 22, BUFFALO, ND 58011-0022
PO BOX 23, BUFFALO, ND 58011-0023
PO BOX 24, BUFFALO, ND 58011-0024
PO BOX 25, BUFFALO, ND 58011-0025
PO BOX 26, BUFFALO, ND 58011-0026
PO BOX 27, BUFFALO, ND 58011-0027
PO BOX 28, BUFFALO, ND 58011-0028
PO BOX 29, BUFFALO, ND 58011-0029
PO BOX 30, BUFFALO, ND 58011-0030
PO BOX 31, BUFFALO, ND 58011-0031
PO BOX 32, BUFFALO, ND 58011-0032
PO BOX 33, BUFFALO, ND 58011-0033
PO BOX 34, BUFFALO, ND 58011-0034
PO BOX 35, BUFFALO, ND 58011-0035
PO BOX 36, BUFFALO, ND 58011-0036
PO BOX 37, BUFFALO, ND 58011-0037
PO BOX 38, BUFFALO, ND 58011-0038
PO BOX 39, BUFFALO, ND 58011-0039
PO BOX 40, BUFFALO, ND 58011-0040
PO BOX 41, BUFFALO, ND 58011-0041
PO BOX 42, BUFFALO, ND 58011-0042
PO BOX 43, BUFFALO, ND 58011-0043
PO BOX 44, BUFFALO, ND 58011-0044
PO BOX 45, BUFFALO, ND 58011-0045
PO BOX 46, BUFFALO, ND 58011-0046
PO BOX 47, BUFFALO, ND 58011-0047
PO BOX 48, BUFFALO, ND 58011-0048
PO BOX 49, BUFFALO, ND 58011-0049
PO BOX 50, BUFFALO, ND 58011-0050
PO BOX 51, BUFFALO, ND 58011-0051
PO BOX 52, BUFFALO, ND 58011-0052
PO BOX 53, BUFFALO, ND 58011-0053
PO BOX 54, BUFFALO, ND 58011-0054
PO BOX 55, BUFFALO, ND 58011-0055
PO BOX 56, BUFFALO, ND 58011-0056
PO BOX 57, BUFFALO, ND 58011-0057
PO BOX 58, BUFFALO, ND 58011-0058
PO BOX 59, BUFFALO, ND 58011-0059
PO BOX 60, BUFFALO, ND 58011-0060
PO BOX 61, BUFFALO, ND 58011-0061
PO BOX 62, BUFFALO, ND 58011-0062
PO BOX 63, BUFFALO, ND 58011-0063
PO BOX 64, BUFFALO, ND 58011-0064
PO BOX 65, BUFFALO, ND 58011-0065
PO BOX 66, BUFFALO, ND 58011-0066
PO BOX 67, BUFFALO, ND 58011-0067
PO BOX 68, BUFFALO, ND 58011-0068
PO BOX 69, BUFFALO, ND 58011-0069
PO BOX 70, BUFFALO, ND 58011-0070
PO BOX 71, BUFFALO, ND 58011-0071
PO BOX 72, BUFFALO, ND 58011-0072
PO BOX 73, BUFFALO, ND 58011-0073
PO BOX 74, BUFFALO, ND 58011-0074
PO BOX 75, BUFFALO, ND 58011-0075
PO BOX 76, BUFFALO, ND 58011-0076
PO BOX 77, BUFFALO, ND 58011-0077
PO BOX 78, BUFFALO, ND 58011-0078
PO BOX 79, BUFFALO, ND 58011-0079
PO BOX 80, BUFFALO, ND 58011-0080
PO BOX 81, BUFFALO, ND 58011-0081
PO BOX 82, BUFFALO, ND 58011-0082
PO BOX 83, BUFFALO, ND 58011-0083
PO BOX 84, BUFFALO, ND 58011-0084
PO BOX 85, BUFFALO, ND 58011-0085
PO BOX 86, BUFFALO, ND 58011-0086
PO BOX 87, BUFFALO, ND 58011-0087
PO BOX 88, BUFFALO, ND 58011-0088
PO BOX 89, BUFFALO, ND 58011-0089
PO BOX 90, BUFFALO, ND 58011-0090
PO BOX 91, BUFFALO, ND 58011-0091
PO BOX 92, BUFFALO, ND 58011-0092
PO BOX 93, BUFFALO, ND 58011-0093
PO BOX 94, BUFFALO, ND 58011-0094
PO BOX 95, BUFFALO, ND 58011-0095
PO BOX 96, BUFFALO, ND 58011-0096
PO BOX 97, BUFFALO, ND 58011-0097
PO BOX 98, BUFFALO, ND 58011-0098
PO BOX 99, BUFFALO, ND 58011-0099
PO BOX 100, BUFFALO, ND 58011-0100
PO BOX 101, BUFFALO, ND 58011-0101
PO BOX 102, BUFFALO, ND 58011-0102
PO BOX 103, BUFFALO, ND 58011-0103
PO BOX 104, BUFFALO, ND 58011-0104
PO BOX 105, BUFFALO, ND 58011-0105
PO BOX 106, BUFFALO, ND 58011-0106
PO BOX 107, BUFFALO, ND 58011-0107
PO BOX 108, BUFFALO, ND 58011-0108
PO BOX 109, BUFFALO, ND 58011-0109
PO BOX 110, BUFFALO, ND 58011-0110
PO BOX 111, BUFFALO, ND 58011-0111
PO BOX 112, BUFFALO, ND 58011-0112
PO BOX 113, BUFFALO, ND 58011-0113
PO BOX 114, BUFFALO, ND 58011-0114
PO BOX 115, BUFFALO, ND 58011-0115
PO BOX 116, BUFFALO, ND 58011-0116
PO BOX 117, BUFFALO, ND 58011-0117
PO BOX 118, BUFFALO, ND 58011-0118
PO BOX 119, BUFFALO, ND 58011-0119
PO BOX 120, BUFFALO, ND 58011-0120
PO BOX 121, BUFFALO, ND 58011-0121
PO BOX 122, BUFFALO, ND 58011-0122
PO BOX 123, BUFFALO, ND 58011-0123
PO BOX 124, BUFFALO, ND 58011-0124
PO BOX 125, BUFFALO, ND 58011-0125
PO BOX 126, BUFFALO, ND 58011-0126
PO BOX 127, BUFFALO, ND 58011-0127
PO BOX 128, BUFFALO, ND 58011-0128
PO BOX 129, BUFFALO, ND 58011-0129
PO BOX 130, BUFFALO, ND 58011-0130
PO BOX 131, BUFFALO, ND 58011-0131
PO BOX 132, BUFFALO, ND 58011-0132
PO BOX 133, BUFFALO, ND 58011-0133
PO BOX 134, BUFFALO, ND 58011-0134
PO BOX 135, BUFFALO, ND 58011-0135
PO BOX 136, BUFFALO, ND 58011-0136
PO BOX 137, BUFFALO, ND 58011-0137
PO BOX 138, BUFFALO, ND 58011-0138
PO BOX 139, BUFFALO, ND 58011-0139
PO BOX 140, BUFFALO, ND 58011-0140
PO BOX 141, BUFFALO, ND 58011-0141
PO BOX 142, BUFFALO, ND 58011-0142
PO BOX 143, BUFFALO, ND 58011-0143
PO BOX 144, BUFFALO, ND 58011-0144
PO BOX 145, BUFFALO, ND 58011-0145
PO BOX 146, BUFFALO, ND 58011-0146
PO BOX 147, BUFFALO, ND 58011-0147
PO BOX 148, BUFFALO, ND 58011-0148
PO BOX 149, BUFFALO, ND 58011-0149
PO BOX 150, BUFFALO, ND 58011-0150
PO BOX 151, BUFFALO, ND 58011-0151
PO BOX 152, BUFFALO, ND 58011-0152
PO BOX 153, BUFFALO, ND 58011-0153
PO BOX 154, BUFFALO, ND 58011-0154
PO BOX 155, BUFFALO, ND 58011-0155
PO BOX 156, BUFFALO, ND 58011-0156
PO BOX 157, BUFFALO, ND 58011-0157
PO BOX 158, BUFFALO, ND 58011-0158
PO BOX 159, BUFFALO, ND 58011-0159
PO BOX 160, BUFFALO, ND 58011-0160
PO BOX 161, BUFFALO, ND 58011-0161
PO BOX 162, BUFFALO, ND 58011-0162
PO BOX 163, BUFFALO, ND 58011-0163
PO BOX 164, BUFFALO, ND 58011-0164
PO BOX 165, BUFFALO, ND 58011-0165
PO BOX 166, BUFFALO, ND 58011-0166
PO BOX 167, BUFFALO, ND 58011-0167
PO BOX 168, BUFFALO, ND 58011-0168
PO BOX 169, BUFFALO, ND 58011-0169
PO BOX 170, BUFFALO, ND 58011-0170
PO BOX 171, BUFFALO, ND 58011-0171
PO BOX 172, BUFFALO, ND 58011-0172
PO BOX 173, BUFFALO, ND 58011-0173
PO BOX 174, BUFFALO, ND 58011-0174
PO BOX 175, BUFFALO, ND 58011-0175
PO BOX 176, BUFFALO, ND 58011-0176
PO BOX 177, BUFFALO, ND 58011-0177
PO BOX 178, BUFFALO, ND 58011-0178
PO BOX 179, BUFFALO, ND 58011-0179
PO BOX 180, BUFFALO, ND 58011-0180
PO BOX 181, BUFFALO, ND 58011-0181
PO BOX 182, BUFFALO, ND 58011-0182
PO BOX 183, BUFFALO, ND 58011-0183
PO BOX 184, BUFFALO, ND 58011-0184
PO BOX 185, BUFFALO, ND 58011-0185
PO BOX 186, BUFFALO, ND 58011-0186
PO BOX 187, BUFFALO, ND 58011-0187
PO BOX 188, BUFFALO, ND 58011-0188
PO BOX 189, BUFFALO, ND 58011-0189
PO BOX 190, BUFFALO, ND 58011-0190
PO BOX 191, BUFFALO, ND 58011-0191
PO BOX 192, BUFFALO, ND 58011-0192
PO BOX 193, BUFFALO, ND 58011-0193
PO BOX 194, BUFFALO, ND 58011-0194
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