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, SHELBY, NE 68662-0001
PO BOX 2, SHELBY, NE 68662-0002
PO BOX 3, SHELBY, NE 68662-0003
PO BOX 4, SHELBY, NE 68662-0004
PO BOX 5, SHELBY, NE 68662-0005
PO BOX 6, SHELBY, NE 68662-0006
PO BOX 7, SHELBY, NE 68662-0007
PO BOX 8, SHELBY, NE 68662-0008
PO BOX 9, SHELBY, NE 68662-0009
PO BOX 10, SHELBY, NE 68662-0010
PO BOX 11, SHELBY, NE 68662-0011
PO BOX 12, SHELBY, NE 68662-0012
PO BOX 13, SHELBY, NE 68662-0013
PO BOX 14, SHELBY, NE 68662-0014
PO BOX 15, SHELBY, NE 68662-0015
PO BOX 16, SHELBY, NE 68662-0016
PO BOX 17, SHELBY, NE 68662-0017
PO BOX 18, SHELBY, NE 68662-0018
PO BOX 19, SHELBY, NE 68662-0019
PO BOX 20, SHELBY, NE 68662-0020
PO BOX 21, SHELBY, NE 68662-0021
PO BOX 22, SHELBY, NE 68662-0022
PO BOX 23, SHELBY, NE 68662-0023
PO BOX 24, SHELBY, NE 68662-0024
PO BOX 25, SHELBY, NE 68662-0025
PO BOX 26, SHELBY, NE 68662-0026
PO BOX 27, SHELBY, NE 68662-0027
PO BOX 28, SHELBY, NE 68662-0028
PO BOX 29, SHELBY, NE 68662-0029
PO BOX 30, SHELBY, NE 68662-0030
PO BOX 31, SHELBY, NE 68662-0031
PO BOX 32, SHELBY, NE 68662-0032
PO BOX 33, SHELBY, NE 68662-0033
PO BOX 34, SHELBY, NE 68662-0034
PO BOX 35, SHELBY, NE 68662-0035
PO BOX 36, SHELBY, NE 68662-0036
PO BOX 37, SHELBY, NE 68662-0037
PO BOX 38, SHELBY, NE 68662-0038
PO BOX 39, SHELBY, NE 68662-0039
PO BOX 40, SHELBY, NE 68662-0040
PO BOX 41, SHELBY, NE 68662-0041
PO BOX 42, SHELBY, NE 68662-0042
PO BOX 43, SHELBY, NE 68662-0043
PO BOX 44, SHELBY, NE 68662-0044
PO BOX 45, SHELBY, NE 68662-0045
PO BOX 46, SHELBY, NE 68662-0046
PO BOX 47, SHELBY, NE 68662-0047
PO BOX 48, SHELBY, NE 68662-0048
PO BOX 49, SHELBY, NE 68662-0049
PO BOX 50, SHELBY, NE 68662-0050
PO BOX 51, SHELBY, NE 68662-0051
PO BOX 52, SHELBY, NE 68662-0052
PO BOX 53, SHELBY, NE 68662-0053
PO BOX 54, SHELBY, NE 68662-0054
PO BOX 55, SHELBY, NE 68662-0055
PO BOX 56, SHELBY, NE 68662-0056
PO BOX 57, SHELBY, NE 68662-0057
PO BOX 58, SHELBY, NE 68662-0058
PO BOX 59, SHELBY, NE 68662-0059
PO BOX 60, SHELBY, NE 68662-0060
PO BOX 61, SHELBY, NE 68662-0061
PO BOX 62, SHELBY, NE 68662-0062
PO BOX 63, SHELBY, NE 68662-0063
PO BOX 64, SHELBY, NE 68662-0064
PO BOX 65, SHELBY, NE 68662-0065
PO BOX 66, SHELBY, NE 68662-0066
PO BOX 67, SHELBY, NE 68662-0067
PO BOX 68, SHELBY, NE 68662-0068
PO BOX 69, SHELBY, NE 68662-0069
PO BOX 70, SHELBY, NE 68662-0070
PO BOX 71, SHELBY, NE 68662-0071
PO BOX 72, SHELBY, NE 68662-0072
PO BOX 73, SHELBY, NE 68662-0073
PO BOX 74, SHELBY, NE 68662-0074
PO BOX 75, SHELBY, NE 68662-0075
PO BOX 76, SHELBY, NE 68662-0076
PO BOX 77, SHELBY, NE 68662-0077
PO BOX 78, SHELBY, NE 68662-0078
PO BOX 79, SHELBY, NE 68662-0079
PO BOX 80, SHELBY, NE 68662-0080
PO BOX 81, SHELBY, NE 68662-0081
PO BOX 82, SHELBY, NE 68662-0082
PO BOX 83, SHELBY, NE 68662-0083
PO BOX 84, SHELBY, NE 68662-0084
PO BOX 85, SHELBY, NE 68662-0085
PO BOX 86, SHELBY, NE 68662-0086
PO BOX 87, SHELBY, NE 68662-0087
PO BOX 88, SHELBY, NE 68662-0088
PO BOX 89, SHELBY, NE 68662-0089
PO BOX 90, SHELBY, NE 68662-0090
PO BOX 91, SHELBY, NE 68662-0091
PO BOX 92, SHELBY, NE 68662-0092
PO BOX 93, SHELBY, NE 68662-0093
PO BOX 94, SHELBY, NE 68662-0094
PO BOX 95, SHELBY, NE 68662-0095
PO BOX 96, SHELBY, NE 68662-0096
PO BOX 97, SHELBY, NE 68662-0097
PO BOX 98, SHELBY, NE 68662-0098
PO BOX 99, SHELBY, NE 68662-0099
PO BOX 100, SHELBY, NE 68662-0100
PO BOX 101, SHELBY, NE 68662-0101
PO BOX 102, SHELBY, NE 68662-0102
PO BOX 103, SHELBY, NE 68662-0103
PO BOX 104, SHELBY, NE 68662-0104
PO BOX 105, SHELBY, NE 68662-0105
PO BOX 106, SHELBY, NE 68662-0106
PO BOX 107, SHELBY, NE 68662-0107
PO BOX 108, SHELBY, NE 68662-0108
PO BOX 109, SHELBY, NE 68662-0109
PO BOX 110, SHELBY, NE 68662-0110
PO BOX 111, SHELBY, NE 68662-0111
PO BOX 112, SHELBY, NE 68662-0112
PO BOX 113, SHELBY, NE 68662-0113
PO BOX 114, SHELBY, NE 68662-0114
PO BOX 115, SHELBY, NE 68662-0115
PO BOX 116, SHELBY, NE 68662-0116
PO BOX 117, SHELBY, NE 68662-0117
PO BOX 118, SHELBY, NE 68662-0118
PO BOX 119, SHELBY, NE 68662-0119
PO BOX 120, SHELBY, NE 68662-0120
PO BOX 121, SHELBY, NE 68662-0121
PO BOX 122, SHELBY, NE 68662-0122
PO BOX 123, SHELBY, NE 68662-0123
PO BOX 124, SHELBY, NE 68662-0124
PO BOX 125, SHELBY, NE 68662-0125
PO BOX 126, SHELBY, NE 68662-0126
PO BOX 127, SHELBY, NE 68662-0127
PO BOX 128, SHELBY, NE 68662-0128
PO BOX 129, SHELBY, NE 68662-0129
PO BOX 130, SHELBY, NE 68662-0130
PO BOX 131, SHELBY, NE 68662-0131
PO BOX 132, SHELBY, NE 68662-0132
PO BOX 133, SHELBY, NE 68662-0133
PO BOX 134, SHELBY, NE 68662-0134
PO BOX 135, SHELBY, NE 68662-0135
PO BOX 136, SHELBY, NE 68662-0136
PO BOX 137, SHELBY, NE 68662-0137
PO BOX 138, SHELBY, NE 68662-0138
PO BOX 139, SHELBY, NE 68662-0139
PO BOX 140, SHELBY, NE 68662-0140
PO BOX 141, SHELBY, NE 68662-0141
PO BOX 142, SHELBY, NE 68662-0142
PO BOX 143, SHELBY, NE 68662-0143
PO BOX 144, SHELBY, NE 68662-0144
PO BOX 145, SHELBY, NE 68662-0145
PO BOX 146, SHELBY, NE 68662-0146
PO BOX 147, SHELBY, NE 68662-0147
PO BOX 148, SHELBY, NE 68662-0148
PO BOX 149, SHELBY, NE 68662-0149
PO BOX 150, SHELBY, NE 68662-0150
PO BOX 151, SHELBY, NE 68662-0151
PO BOX 152, SHELBY, NE 68662-0152
PO BOX 153, SHELBY, NE 68662-0153
PO BOX 154, SHELBY, NE 68662-0154
PO BOX 155, SHELBY, NE 68662-0155
PO BOX 156, SHELBY, NE 68662-0156
PO BOX 157, SHELBY, NE 68662-0157
PO BOX 158, SHELBY, NE 68662-0158
PO BOX 159, SHELBY, NE 68662-0159
PO BOX 160, SHELBY, NE 68662-0160
PO BOX 161, SHELBY, NE 68662-0161
PO BOX 162, SHELBY, NE 68662-0162
PO BOX 163, SHELBY, NE 68662-0163
PO BOX 164, SHELBY, NE 68662-0164
PO BOX 165, SHELBY, NE 68662-0165
PO BOX 166, SHELBY, NE 68662-0166
PO BOX 167, SHELBY, NE 68662-0167
PO BOX 168, SHELBY, NE 68662-0168
PO BOX 169, SHELBY, NE 68662-0169
PO BOX 170, SHELBY, NE 68662-0170
PO BOX 171, SHELBY, NE 68662-0171
PO BOX 172, SHELBY, NE 68662-0172
PO BOX 173, SHELBY, NE 68662-0173
PO BOX 174, SHELBY, NE 68662-0174
PO BOX 175, SHELBY, NE 68662-0175
PO BOX 176, SHELBY, NE 68662-0176
PO BOX 177, SHELBY, NE 68662-0177
PO BOX 178, SHELBY, NE 68662-0178
PO BOX 179, SHELBY, NE 68662-0179
PO BOX 180, SHELBY, NE 68662-0180
PO BOX 181, SHELBY, NE 68662-0181
PO BOX 182, SHELBY, NE 68662-0182
PO BOX 183, SHELBY, NE 68662-0183
PO BOX 184, SHELBY, NE 68662-0184
PO BOX 185, SHELBY, NE 68662-0185
PO BOX 186, SHELBY, NE 68662-0186
PO BOX 187, SHELBY, NE 68662-0187
PO BOX 188, SHELBY, NE 68662-0188
PO BOX 189, SHELBY, NE 68662-0189
PO BOX 190, SHELBY, NE 68662-0190
PO BOX 191, SHELBY, NE 68662-0191
PO BOX 192, SHELBY, NE 68662-0192
PO BOX 193, SHELBY, NE 68662-0193
PO BOX 194, SHELBY, NE 68662-0194
PO BOX 195, SHELBY, NE 68662-0195
PO BOX 196, SHELBY, NE 68662-0196
PO BOX 197, SHELBY, NE 68662-0197
PO BOX 198, SHELBY, NE 68662-0198
PO BOX 199, SHELBY, NE 68662-0199
PO BOX 200, SHELBY, NE 68662-0200
PO BOX 201, SHELBY, NE 68662-0201
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