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 21, MILNOR, ND 58060-0021
PO BOX 22, MILNOR, ND 58060-0022
PO BOX 23, MILNOR, ND 58060-0023
PO BOX 24, MILNOR, ND 58060-0024
PO BOX 25, MILNOR, ND 58060-0025
PO BOX 26, MILNOR, ND 58060-0026
PO BOX 27, MILNOR, ND 58060-0027
PO BOX 28, MILNOR, ND 58060-0028
PO BOX 29, MILNOR, ND 58060-0029
PO BOX 30, MILNOR, ND 58060-0030
PO BOX 31, MILNOR, ND 58060-0031
PO BOX 32, MILNOR, ND 58060-0032
PO BOX 33, MILNOR, ND 58060-0033
PO BOX 34, MILNOR, ND 58060-0034
PO BOX 35, MILNOR, ND 58060-0035
PO BOX 36, MILNOR, ND 58060-0036
PO BOX 37, MILNOR, ND 58060-0037
PO BOX 38, MILNOR, ND 58060-0038
PO BOX 39, MILNOR, ND 58060-0039
PO BOX 40, MILNOR, ND 58060-0040
PO BOX 41, MILNOR, ND 58060-0041
PO BOX 42, MILNOR, ND 58060-0042
PO BOX 43, MILNOR, ND 58060-0043
PO BOX 44, MILNOR, ND 58060-0044
PO BOX 45, MILNOR, ND 58060-0045
PO BOX 46, MILNOR, ND 58060-0046
PO BOX 47, MILNOR, ND 58060-0047
PO BOX 48, MILNOR, ND 58060-0048
PO BOX 49, MILNOR, ND 58060-0049
PO BOX 50, MILNOR, ND 58060-0050
PO BOX 51, MILNOR, ND 58060-0051
PO BOX 52, MILNOR, ND 58060-0052
PO BOX 53, MILNOR, ND 58060-0053
PO BOX 54, MILNOR, ND 58060-0054
PO BOX 55, MILNOR, ND 58060-0055
PO BOX 56, MILNOR, ND 58060-0056
PO BOX 57, MILNOR, ND 58060-0057
PO BOX 58, MILNOR, ND 58060-0058
PO BOX 59, MILNOR, ND 58060-0059
PO BOX 60, MILNOR, ND 58060-0060
PO BOX 61, MILNOR, ND 58060-0061
PO BOX 62, MILNOR, ND 58060-0062
PO BOX 63, MILNOR, ND 58060-0063
PO BOX 64, MILNOR, ND 58060-0064
PO BOX 65, MILNOR, ND 58060-0065
PO BOX 66, MILNOR, ND 58060-0066
PO BOX 67, MILNOR, ND 58060-0067
PO BOX 68, MILNOR, ND 58060-0068
PO BOX 69, MILNOR, ND 58060-0069
PO BOX 70, MILNOR, ND 58060-0070
PO BOX 71, MILNOR, ND 58060-0071
PO BOX 72, MILNOR, ND 58060-0072
PO BOX 73, MILNOR, ND 58060-0073
PO BOX 74, MILNOR, ND 58060-0074
PO BOX 75, MILNOR, ND 58060-0075
PO BOX 76, MILNOR, ND 58060-0076
PO BOX 77, MILNOR, ND 58060-0077
PO BOX 78, MILNOR, ND 58060-0078
PO BOX 79, MILNOR, ND 58060-0079
PO BOX 80, MILNOR, ND 58060-0080
PO BOX 81, MILNOR, ND 58060-0081
PO BOX 82, MILNOR, ND 58060-0082
PO BOX 83, MILNOR, ND 58060-0083
PO BOX 84, MILNOR, ND 58060-0084
PO BOX 85, MILNOR, ND 58060-0085
PO BOX 86, MILNOR, ND 58060-0086
PO BOX 87, MILNOR, ND 58060-0087
PO BOX 88, MILNOR, ND 58060-0088
PO BOX 89, MILNOR, ND 58060-0089
PO BOX 90, MILNOR, ND 58060-0090
PO BOX 91, MILNOR, ND 58060-0091
PO BOX 92, MILNOR, ND 58060-0092
PO BOX 93, MILNOR, ND 58060-0093
PO BOX 94, MILNOR, ND 58060-0094
PO BOX 95, MILNOR, ND 58060-0095
PO BOX 96, MILNOR, ND 58060-0096
PO BOX 97, MILNOR, ND 58060-0097
PO BOX 98, MILNOR, ND 58060-0098
PO BOX 99, MILNOR, ND 58060-0099
PO BOX 100, MILNOR, ND 58060-0100
PO BOX 101, MILNOR, ND 58060-0101
PO BOX 102, MILNOR, ND 58060-0102
PO BOX 103, MILNOR, ND 58060-0103
PO BOX 104, MILNOR, ND 58060-0104
PO BOX 105, MILNOR, ND 58060-0105
PO BOX 106, MILNOR, ND 58060-0106
PO BOX 107, MILNOR, ND 58060-0107
PO BOX 108, MILNOR, ND 58060-0108
PO BOX 109, MILNOR, ND 58060-0109
PO BOX 110, MILNOR, ND 58060-0110
PO BOX 111, MILNOR, ND 58060-0111
PO BOX 112, MILNOR, ND 58060-0112
PO BOX 113, MILNOR, ND 58060-0113
PO BOX 114, MILNOR, ND 58060-0114
PO BOX 115, MILNOR, ND 58060-0115
PO BOX 116, MILNOR, ND 58060-0116
PO BOX 117, MILNOR, ND 58060-0117
PO BOX 118, MILNOR, ND 58060-0118
PO BOX 119, MILNOR, ND 58060-0119
PO BOX 120, MILNOR, ND 58060-0120
PO BOX 121, MILNOR, ND 58060-0121
PO BOX 122, MILNOR, ND 58060-0122
PO BOX 123, MILNOR, ND 58060-0123
PO BOX 124, MILNOR, ND 58060-0124
PO BOX 125, MILNOR, ND 58060-0125
PO BOX 126, MILNOR, ND 58060-0126
PO BOX 127, MILNOR, ND 58060-0127
PO BOX 128, MILNOR, ND 58060-0128
PO BOX 129, MILNOR, ND 58060-0129
PO BOX 130, MILNOR, ND 58060-0130
PO BOX 131, MILNOR, ND 58060-0131
PO BOX 132, MILNOR, ND 58060-0132
PO BOX 133, MILNOR, ND 58060-0133
PO BOX 134, MILNOR, ND 58060-0134
PO BOX 135, MILNOR, ND 58060-0135
PO BOX 136, MILNOR, ND 58060-0136
PO BOX 137, MILNOR, ND 58060-0137
PO BOX 138, MILNOR, ND 58060-0138
PO BOX 139, MILNOR, ND 58060-0139
PO BOX 140, MILNOR, ND 58060-0140
PO BOX 141, MILNOR, ND 58060-0141
PO BOX 142, MILNOR, ND 58060-0142
PO BOX 143, MILNOR, ND 58060-0143
PO BOX 144, MILNOR, ND 58060-0144
PO BOX 145, MILNOR, ND 58060-0145
PO BOX 146, MILNOR, ND 58060-0146
PO BOX 147, MILNOR, ND 58060-0147
PO BOX 148, MILNOR, ND 58060-0148
PO BOX 149, MILNOR, ND 58060-0149
PO BOX 150, MILNOR, ND 58060-0150
PO BOX 151, MILNOR, ND 58060-0151
PO BOX 152, MILNOR, ND 58060-0152
PO BOX 153, MILNOR, ND 58060-0153
PO BOX 154, MILNOR, ND 58060-0154
PO BOX 155, MILNOR, ND 58060-0155
PO BOX 156, MILNOR, ND 58060-0156
PO BOX 157, MILNOR, ND 58060-0157
PO BOX 158, MILNOR, ND 58060-0158
PO BOX 159, MILNOR, ND 58060-0159
PO BOX 160, MILNOR, ND 58060-0160
PO BOX 161, MILNOR, ND 58060-0161
PO BOX 162, MILNOR, ND 58060-0162
PO BOX 163, MILNOR, ND 58060-0163
PO BOX 164, MILNOR, ND 58060-0164
PO BOX 165, MILNOR, ND 58060-0165
PO BOX 166, MILNOR, ND 58060-0166
PO BOX 167, MILNOR, ND 58060-0167
PO BOX 168, MILNOR, ND 58060-0168
PO BOX 169, MILNOR, ND 58060-0169
PO BOX 170, MILNOR, ND 58060-0170
PO BOX 171, MILNOR, ND 58060-0171
PO BOX 172, MILNOR, ND 58060-0172
PO BOX 173, MILNOR, ND 58060-0173
PO BOX 174, MILNOR, ND 58060-0174
PO BOX 175, MILNOR, ND 58060-0175
PO BOX 176, MILNOR, ND 58060-0176
PO BOX 177, MILNOR, ND 58060-0177
PO BOX 178, MILNOR, ND 58060-0178
PO BOX 179, MILNOR, ND 58060-0179
PO BOX 180, MILNOR, ND 58060-0180
PO BOX 181, MILNOR, ND 58060-0181
PO BOX 182, MILNOR, ND 58060-0182
PO BOX 183, MILNOR, ND 58060-0183
PO BOX 184, MILNOR, ND 58060-0184
PO BOX 185, MILNOR, ND 58060-0185
PO BOX 186, MILNOR, ND 58060-0186
PO BOX 187, MILNOR, ND 58060-0187
PO BOX 188, MILNOR, ND 58060-0188
PO BOX 189, MILNOR, ND 58060-0189
PO BOX 190, MILNOR, ND 58060-0190
PO BOX 191, MILNOR, ND 58060-0191
PO BOX 192, MILNOR, ND 58060-0192
PO BOX 193, MILNOR, ND 58060-0193
PO BOX 194, MILNOR, ND 58060-0194
PO BOX 195, MILNOR, ND 58060-0195
PO BOX 196, MILNOR, ND 58060-0196
PO BOX 197, MILNOR, ND 58060-0197
PO BOX 198, MILNOR, ND 58060-0198
PO BOX 199, MILNOR, ND 58060-0199
PO BOX 200, MILNOR, ND 58060-0200
PO BOX 201, MILNOR, ND 58060-0201
PO BOX 202, MILNOR, ND 58060-0202
PO BOX 203, MILNOR, ND 58060-0203
PO BOX 204, MILNOR, ND 58060-0204
PO BOX 205, MILNOR, ND 58060-0205
PO BOX 206, MILNOR, ND 58060-0206
PO BOX 207, MILNOR, ND 58060-0207
PO BOX 208, MILNOR, ND 58060-0208
PO BOX 209, MILNOR, ND 58060-0209
PO BOX 210, MILNOR, ND 58060-0210
PO BOX 211, MILNOR, ND 58060-0211
PO BOX 212, MILNOR, ND 58060-0212
PO BOX 213, MILNOR, ND 58060-0213
PO BOX 214, MILNOR, ND 58060-0214
PO BOX 215, MILNOR, ND 58060-0215
PO BOX 216, MILNOR, ND 58060-0216
PO BOX 217, MILNOR, ND 58060-0217
PO BOX 218, MILNOR, ND 58060-0218
PO BOX 219, MILNOR, ND 58060-0219
PO BOX 220, MILNOR, ND 58060-0220
PO BOX 221, MILNOR, ND 58060-0221
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