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, GUIDE ROCK, NE 68942-0001
PO BOX 2, GUIDE ROCK, NE 68942-0002
PO BOX 3, GUIDE ROCK, NE 68942-0003
PO BOX 4, GUIDE ROCK, NE 68942-0004
PO BOX 5, GUIDE ROCK, NE 68942-0005
PO BOX 6, GUIDE ROCK, NE 68942-0006
PO BOX 7, GUIDE ROCK, NE 68942-0007
PO BOX 8, GUIDE ROCK, NE 68942-0008
PO BOX 9, GUIDE ROCK, NE 68942-0009
PO BOX 10, GUIDE ROCK, NE 68942-0010
PO BOX 11, GUIDE ROCK, NE 68942-0011
PO BOX 12, GUIDE ROCK, NE 68942-0012
PO BOX 13, GUIDE ROCK, NE 68942-0013
PO BOX 14, GUIDE ROCK, NE 68942-0014
PO BOX 15, GUIDE ROCK, NE 68942-0015
PO BOX 16, GUIDE ROCK, NE 68942-0016
PO BOX 17, GUIDE ROCK, NE 68942-0017
PO BOX 18, GUIDE ROCK, NE 68942-0018
PO BOX 19, GUIDE ROCK, NE 68942-0019
PO BOX 20, GUIDE ROCK, NE 68942-0020
PO BOX 21, GUIDE ROCK, NE 68942-0021
PO BOX 22, GUIDE ROCK, NE 68942-0022
PO BOX 23, GUIDE ROCK, NE 68942-0023
PO BOX 24, GUIDE ROCK, NE 68942-0024
PO BOX 25, GUIDE ROCK, NE 68942-0025
PO BOX 26, GUIDE ROCK, NE 68942-0026
PO BOX 27, GUIDE ROCK, NE 68942-0027
PO BOX 28, GUIDE ROCK, NE 68942-0028
PO BOX 29, GUIDE ROCK, NE 68942-0029
PO BOX 30, GUIDE ROCK, NE 68942-0030
PO BOX 31, GUIDE ROCK, NE 68942-0031
PO BOX 32, GUIDE ROCK, NE 68942-0032
PO BOX 33, GUIDE ROCK, NE 68942-0033
PO BOX 34, GUIDE ROCK, NE 68942-0034
PO BOX 35, GUIDE ROCK, NE 68942-0035
PO BOX 36, GUIDE ROCK, NE 68942-0036
PO BOX 37, GUIDE ROCK, NE 68942-0037
PO BOX 38, GUIDE ROCK, NE 68942-0038
PO BOX 39, GUIDE ROCK, NE 68942-0039
PO BOX 40, GUIDE ROCK, NE 68942-0040
PO BOX 41, GUIDE ROCK, NE 68942-0041
PO BOX 42, GUIDE ROCK, NE 68942-0042
PO BOX 43, GUIDE ROCK, NE 68942-0043
PO BOX 44, GUIDE ROCK, NE 68942-0044
PO BOX 45, GUIDE ROCK, NE 68942-0045
PO BOX 46, GUIDE ROCK, NE 68942-0046
PO BOX 47, GUIDE ROCK, NE 68942-0047
PO BOX 48, GUIDE ROCK, NE 68942-0048
PO BOX 49, GUIDE ROCK, NE 68942-0049
PO BOX 50, GUIDE ROCK, NE 68942-0050
PO BOX 51, GUIDE ROCK, NE 68942-0051
PO BOX 52, GUIDE ROCK, NE 68942-0052
PO BOX 53, GUIDE ROCK, NE 68942-0053
PO BOX 54, GUIDE ROCK, NE 68942-0054
PO BOX 55, GUIDE ROCK, NE 68942-0055
PO BOX 56, GUIDE ROCK, NE 68942-0056
PO BOX 57, GUIDE ROCK, NE 68942-0057
PO BOX 58, GUIDE ROCK, NE 68942-0058
PO BOX 59, GUIDE ROCK, NE 68942-0059
PO BOX 60, GUIDE ROCK, NE 68942-0060
PO BOX 61, GUIDE ROCK, NE 68942-0061
PO BOX 62, GUIDE ROCK, NE 68942-0062
PO BOX 63, GUIDE ROCK, NE 68942-0063
PO BOX 64, GUIDE ROCK, NE 68942-0064
PO BOX 65, GUIDE ROCK, NE 68942-0065
PO BOX 66, GUIDE ROCK, NE 68942-0066
PO BOX 67, GUIDE ROCK, NE 68942-0067
PO BOX 68, GUIDE ROCK, NE 68942-0068
PO BOX 69, GUIDE ROCK, NE 68942-0069
PO BOX 70, GUIDE ROCK, NE 68942-0070
PO BOX 71, GUIDE ROCK, NE 68942-0071
PO BOX 72, GUIDE ROCK, NE 68942-0072
PO BOX 73, GUIDE ROCK, NE 68942-0073
PO BOX 74, GUIDE ROCK, NE 68942-0074
PO BOX 75, GUIDE ROCK, NE 68942-0075
PO BOX 76, GUIDE ROCK, NE 68942-0076
PO BOX 77, GUIDE ROCK, NE 68942-0077
PO BOX 78, GUIDE ROCK, NE 68942-0078
PO BOX 79, GUIDE ROCK, NE 68942-0079
PO BOX 80, GUIDE ROCK, NE 68942-0080
PO BOX 81, GUIDE ROCK, NE 68942-0081
PO BOX 82, GUIDE ROCK, NE 68942-0082
PO BOX 83, GUIDE ROCK, NE 68942-0083
PO BOX 84, GUIDE ROCK, NE 68942-0084
PO BOX 85, GUIDE ROCK, NE 68942-0085
PO BOX 86, GUIDE ROCK, NE 68942-0086
PO BOX 87, GUIDE ROCK, NE 68942-0087
PO BOX 88, GUIDE ROCK, NE 68942-0088
PO BOX 89, GUIDE ROCK, NE 68942-0089
PO BOX 90, GUIDE ROCK, NE 68942-0090
PO BOX 91, GUIDE ROCK, NE 68942-0091
PO BOX 92, GUIDE ROCK, NE 68942-0092
PO BOX 93, GUIDE ROCK, NE 68942-0093
PO BOX 94, GUIDE ROCK, NE 68942-0094
PO BOX 95, GUIDE ROCK, NE 68942-0095
PO BOX 96, GUIDE ROCK, NE 68942-0096
PO BOX 97, GUIDE ROCK, NE 68942-0097
PO BOX 98, GUIDE ROCK, NE 68942-0098
PO BOX 99, GUIDE ROCK, NE 68942-0099
PO BOX 100, GUIDE ROCK, NE 68942-0100
PO BOX 101, GUIDE ROCK, NE 68942-0101
PO BOX 102, GUIDE ROCK, NE 68942-0102
PO BOX 103, GUIDE ROCK, NE 68942-0103
PO BOX 104, GUIDE ROCK, NE 68942-0104
PO BOX 105, GUIDE ROCK, NE 68942-0105
PO BOX 106, GUIDE ROCK, NE 68942-0106
PO BOX 107, GUIDE ROCK, NE 68942-0107
PO BOX 108, GUIDE ROCK, NE 68942-0108
PO BOX 109, GUIDE ROCK, NE 68942-0109
PO BOX 110, GUIDE ROCK, NE 68942-0110
PO BOX 111, GUIDE ROCK, NE 68942-0111
PO BOX 112, GUIDE ROCK, NE 68942-0112
PO BOX 113, GUIDE ROCK, NE 68942-0113
PO BOX 114, GUIDE ROCK, NE 68942-0114
PO BOX 115, GUIDE ROCK, NE 68942-0115
PO BOX 116, GUIDE ROCK, NE 68942-0116
PO BOX 117, GUIDE ROCK, NE 68942-0117
PO BOX 118, GUIDE ROCK, NE 68942-0118
PO BOX 119, GUIDE ROCK, NE 68942-0119
PO BOX 120, GUIDE ROCK, NE 68942-0120
PO BOX 121, GUIDE ROCK, NE 68942-0121
PO BOX 122, GUIDE ROCK, NE 68942-0122
PO BOX 123, GUIDE ROCK, NE 68942-0123
PO BOX 124, GUIDE ROCK, NE 68942-0124
PO BOX 125, GUIDE ROCK, NE 68942-0125
PO BOX 126, GUIDE ROCK, NE 68942-0126
PO BOX 127, GUIDE ROCK, NE 68942-0127
PO BOX 128, GUIDE ROCK, NE 68942-0128
PO BOX 129, GUIDE ROCK, NE 68942-0129
PO BOX 130, GUIDE ROCK, NE 68942-0130
PO BOX 131, GUIDE ROCK, NE 68942-0131
PO BOX 132, GUIDE ROCK, NE 68942-0132
PO BOX 133, GUIDE ROCK, NE 68942-0133
PO BOX 134, GUIDE ROCK, NE 68942-0134
PO BOX 135, GUIDE ROCK, NE 68942-0135
PO BOX 136, GUIDE ROCK, NE 68942-0136
PO BOX 137, GUIDE ROCK, NE 68942-0137
PO BOX 138, GUIDE ROCK, NE 68942-0138
PO BOX 139, GUIDE ROCK, NE 68942-0139
PO BOX 140, GUIDE ROCK, NE 68942-0140
PO BOX 141, GUIDE ROCK, NE 68942-0141
PO BOX 142, GUIDE ROCK, NE 68942-0142
PO BOX 143, GUIDE ROCK, NE 68942-0143
PO BOX 144, GUIDE ROCK, NE 68942-0144
PO BOX 145, GUIDE ROCK, NE 68942-0145
PO BOX 146, GUIDE ROCK, NE 68942-0146
PO BOX 147, GUIDE ROCK, NE 68942-0147
PO BOX 148, GUIDE ROCK, NE 68942-0148
PO BOX 149, GUIDE ROCK, NE 68942-0149
PO BOX 150, GUIDE ROCK, NE 68942-0150
PO BOX 151, GUIDE ROCK, NE 68942-0151
PO BOX 152, GUIDE ROCK, NE 68942-0152
PO BOX 153, GUIDE ROCK, NE 68942-0153
PO BOX 154, GUIDE ROCK, NE 68942-0154
PO BOX 155, GUIDE ROCK, NE 68942-0155
PO BOX 156, GUIDE ROCK, NE 68942-0156
PO BOX 157, GUIDE ROCK, NE 68942-0157
PO BOX 158, GUIDE ROCK, NE 68942-0158
PO BOX 159, GUIDE ROCK, NE 68942-0159
PO BOX 160, GUIDE ROCK, NE 68942-0160
PO BOX 161, GUIDE ROCK, NE 68942-0161
PO BOX 162, GUIDE ROCK, NE 68942-0162
PO BOX 163, GUIDE ROCK, NE 68942-0163
PO BOX 164, GUIDE ROCK, NE 68942-0164
PO BOX 165, GUIDE ROCK, NE 68942-0165
PO BOX 166, GUIDE ROCK, NE 68942-0166
PO BOX 167, GUIDE ROCK, NE 68942-0167
PO BOX 168, GUIDE ROCK, NE 68942-0168
PO BOX 169, GUIDE ROCK, NE 68942-0169
PO BOX 170, GUIDE ROCK, NE 68942-0170
PO BOX 171, GUIDE ROCK, NE 68942-0171
PO BOX 172, GUIDE ROCK, NE 68942-0172
PO BOX 173, GUIDE ROCK, NE 68942-0173
PO BOX 174, GUIDE ROCK, NE 68942-0174
PO BOX 175, GUIDE ROCK, NE 68942-0175
PO BOX 176, GUIDE ROCK, NE 68942-0176
PO BOX 177, GUIDE ROCK, NE 68942-0177
PO BOX 178, GUIDE ROCK, NE 68942-0178
PO BOX 179, GUIDE ROCK, NE 68942-0179
PO BOX 180, GUIDE ROCK, NE 68942-0180
PO BOX 181, GUIDE ROCK, NE 68942-0181
PO BOX 182, GUIDE ROCK, NE 68942-0182
PO BOX 183, GUIDE ROCK, NE 68942-0183
PO BOX 184, GUIDE ROCK, NE 68942-0184
PO BOX 185, GUIDE ROCK, NE 68942-0185
PO BOX 186, GUIDE ROCK, NE 68942-0186
PO BOX 187, GUIDE ROCK, NE 68942-0187
PO BOX 188, GUIDE ROCK, NE 68942-0188
PO BOX 189, GUIDE ROCK, NE 68942-0189
PO BOX 190, GUIDE ROCK, NE 68942-0190
PO BOX 191, GUIDE ROCK, NE 68942-0191
PO BOX 192, GUIDE ROCK, NE 68942-0192
PO BOX 193, GUIDE ROCK, NE 68942-0193
PO BOX 194, GUIDE ROCK, NE 68942-0194
PO BOX 195, GUIDE ROCK, NE 68942-0195
PO BOX 196, GUIDE ROCK, NE 68942-0196
PO BOX 197, GUIDE ROCK, NE 68942-0197
PO BOX 198, GUIDE ROCK, NE 68942-0198
PO BOX 199, GUIDE ROCK, NE 68942-0199
PO BOX 200, GUIDE ROCK, NE 68942-0200
PO BOX 201, GUIDE ROCK, NE 68942-0201
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