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, CLARKS, NE 68628-0001
PO BOX 2, CLARKS, NE 68628-0002
PO BOX 3, CLARKS, NE 68628-0003
PO BOX 4, CLARKS, NE 68628-0004
PO BOX 5, CLARKS, NE 68628-0005
PO BOX 6, CLARKS, NE 68628-0006
PO BOX 7, CLARKS, NE 68628-0007
PO BOX 8, CLARKS, NE 68628-0008
PO BOX 9, CLARKS, NE 68628-0009
PO BOX 10, CLARKS, NE 68628-0010
PO BOX 11, CLARKS, NE 68628-0011
PO BOX 12, CLARKS, NE 68628-0012
PO BOX 13, CLARKS, NE 68628-0013
PO BOX 14, CLARKS, NE 68628-0014
PO BOX 15, CLARKS, NE 68628-0015
PO BOX 16, CLARKS, NE 68628-0016
PO BOX 17, CLARKS, NE 68628-0017
PO BOX 18, CLARKS, NE 68628-0018
PO BOX 19, CLARKS, NE 68628-0019
PO BOX 20, CLARKS, NE 68628-0020
PO BOX 21, CLARKS, NE 68628-0021
PO BOX 22, CLARKS, NE 68628-0022
PO BOX 23, CLARKS, NE 68628-0023
PO BOX 24, CLARKS, NE 68628-0024
PO BOX 25, CLARKS, NE 68628-0025
PO BOX 26, CLARKS, NE 68628-0026
PO BOX 27, CLARKS, NE 68628-0027
PO BOX 28, CLARKS, NE 68628-0028
PO BOX 29, CLARKS, NE 68628-0029
PO BOX 30, CLARKS, NE 68628-0030
PO BOX 31, CLARKS, NE 68628-0031
PO BOX 32, CLARKS, NE 68628-0032
PO BOX 33, CLARKS, NE 68628-0033
PO BOX 34, CLARKS, NE 68628-0034
PO BOX 35, CLARKS, NE 68628-0035
PO BOX 36, CLARKS, NE 68628-0036
PO BOX 37, CLARKS, NE 68628-0037
PO BOX 38, CLARKS, NE 68628-0038
PO BOX 39, CLARKS, NE 68628-0039
PO BOX 40, CLARKS, NE 68628-0040
PO BOX 41, CLARKS, NE 68628-0041
PO BOX 42, CLARKS, NE 68628-0042
PO BOX 43, CLARKS, NE 68628-0043
PO BOX 44, CLARKS, NE 68628-0044
PO BOX 45, CLARKS, NE 68628-0045
PO BOX 46, CLARKS, NE 68628-0046
PO BOX 47, CLARKS, NE 68628-0047
PO BOX 48, CLARKS, NE 68628-0048
PO BOX 49, CLARKS, NE 68628-0049
PO BOX 50, CLARKS, NE 68628-0050
PO BOX 51, CLARKS, NE 68628-0051
PO BOX 52, CLARKS, NE 68628-0052
PO BOX 53, CLARKS, NE 68628-0053
PO BOX 54, CLARKS, NE 68628-0054
PO BOX 55, CLARKS, NE 68628-0055
PO BOX 56, CLARKS, NE 68628-0056
PO BOX 57, CLARKS, NE 68628-0057
PO BOX 58, CLARKS, NE 68628-0058
PO BOX 59, CLARKS, NE 68628-0059
PO BOX 60, CLARKS, NE 68628-0060
PO BOX 61, CLARKS, NE 68628-0061
PO BOX 62, CLARKS, NE 68628-0062
PO BOX 63, CLARKS, NE 68628-0063
PO BOX 64, CLARKS, NE 68628-0064
PO BOX 65, CLARKS, NE 68628-0065
PO BOX 66, CLARKS, NE 68628-0066
PO BOX 67, CLARKS, NE 68628-0067
PO BOX 68, CLARKS, NE 68628-0068
PO BOX 69, CLARKS, NE 68628-0069
PO BOX 70, CLARKS, NE 68628-0070
PO BOX 71, CLARKS, NE 68628-0071
PO BOX 72, CLARKS, NE 68628-0072
PO BOX 73, CLARKS, NE 68628-0073
PO BOX 74, CLARKS, NE 68628-0074
PO BOX 75, CLARKS, NE 68628-0075
PO BOX 76, CLARKS, NE 68628-0076
PO BOX 77, CLARKS, NE 68628-0077
PO BOX 78, CLARKS, NE 68628-0078
PO BOX 79, CLARKS, NE 68628-0079
PO BOX 80, CLARKS, NE 68628-0080
PO BOX 81, CLARKS, NE 68628-0081
PO BOX 82, CLARKS, NE 68628-0082
PO BOX 83, CLARKS, NE 68628-0083
PO BOX 84, CLARKS, NE 68628-0084
PO BOX 85, CLARKS, NE 68628-0085
PO BOX 86, CLARKS, NE 68628-0086
PO BOX 87, CLARKS, NE 68628-0087
PO BOX 88, CLARKS, NE 68628-0088
PO BOX 89, CLARKS, NE 68628-0089
PO BOX 90, CLARKS, NE 68628-0090
PO BOX 91, CLARKS, NE 68628-0091
PO BOX 92, CLARKS, NE 68628-0092
PO BOX 93, CLARKS, NE 68628-0093
PO BOX 94, CLARKS, NE 68628-0094
PO BOX 95, CLARKS, NE 68628-0095
PO BOX 96, CLARKS, NE 68628-0096
PO BOX 97, CLARKS, NE 68628-0097
PO BOX 98, CLARKS, NE 68628-0098
PO BOX 99, CLARKS, NE 68628-0099
PO BOX 100, CLARKS, NE 68628-0100
PO BOX 101, CLARKS, NE 68628-0101
PO BOX 102, CLARKS, NE 68628-0102
PO BOX 103, CLARKS, NE 68628-0103
PO BOX 104, CLARKS, NE 68628-0104
PO BOX 105, CLARKS, NE 68628-0105
PO BOX 106, CLARKS, NE 68628-0106
PO BOX 107, CLARKS, NE 68628-0107
PO BOX 108, CLARKS, NE 68628-0108
PO BOX 109, CLARKS, NE 68628-0109
PO BOX 110, CLARKS, NE 68628-0110
PO BOX 111, CLARKS, NE 68628-0111
PO BOX 112, CLARKS, NE 68628-0112
PO BOX 113, CLARKS, NE 68628-0113
PO BOX 114, CLARKS, NE 68628-0114
PO BOX 115, CLARKS, NE 68628-0115
PO BOX 116, CLARKS, NE 68628-0116
PO BOX 117, CLARKS, NE 68628-0117
PO BOX 118, CLARKS, NE 68628-0118
PO BOX 119, CLARKS, NE 68628-0119
PO BOX 120, CLARKS, NE 68628-0120
PO BOX 121, CLARKS, NE 68628-0121
PO BOX 122, CLARKS, NE 68628-0122
PO BOX 123, CLARKS, NE 68628-0123
PO BOX 124, CLARKS, NE 68628-0124
PO BOX 125, CLARKS, NE 68628-0125
PO BOX 126, CLARKS, NE 68628-0126
PO BOX 127, CLARKS, NE 68628-0127
PO BOX 128, CLARKS, NE 68628-0128
PO BOX 129, CLARKS, NE 68628-0129
PO BOX 130, CLARKS, NE 68628-0130
PO BOX 131, CLARKS, NE 68628-0131
PO BOX 132, CLARKS, NE 68628-0132
PO BOX 133, CLARKS, NE 68628-0133
PO BOX 134, CLARKS, NE 68628-0134
PO BOX 135, CLARKS, NE 68628-0135
PO BOX 136, CLARKS, NE 68628-0136
PO BOX 137, CLARKS, NE 68628-0137
PO BOX 138, CLARKS, NE 68628-0138
PO BOX 139, CLARKS, NE 68628-0139
PO BOX 140, CLARKS, NE 68628-0140
PO BOX 141, CLARKS, NE 68628-0141
PO BOX 142, CLARKS, NE 68628-0142
PO BOX 143, CLARKS, NE 68628-0143
PO BOX 144, CLARKS, NE 68628-0144
PO BOX 145, CLARKS, NE 68628-0145
PO BOX 146, CLARKS, NE 68628-0146
PO BOX 147, CLARKS, NE 68628-0147
PO BOX 148, CLARKS, NE 68628-0148
PO BOX 149, CLARKS, NE 68628-0149
PO BOX 150, CLARKS, NE 68628-0150
PO BOX 151, CLARKS, NE 68628-0151
PO BOX 152, CLARKS, NE 68628-0152
PO BOX 153, CLARKS, NE 68628-0153
PO BOX 154, CLARKS, NE 68628-0154
PO BOX 155, CLARKS, NE 68628-0155
PO BOX 156, CLARKS, NE 68628-0156
PO BOX 157, CLARKS, NE 68628-0157
PO BOX 158, CLARKS, NE 68628-0158
PO BOX 159, CLARKS, NE 68628-0159
PO BOX 160, CLARKS, NE 68628-0160
PO BOX 161, CLARKS, NE 68628-0161
PO BOX 162, CLARKS, NE 68628-0162
PO BOX 163, CLARKS, NE 68628-0163
PO BOX 164, CLARKS, NE 68628-0164
PO BOX 165, CLARKS, NE 68628-0165
PO BOX 166, CLARKS, NE 68628-0166
PO BOX 167, CLARKS, NE 68628-0167
PO BOX 168, CLARKS, NE 68628-0168
PO BOX 169, CLARKS, NE 68628-0169
PO BOX 170, CLARKS, NE 68628-0170
PO BOX 171, CLARKS, NE 68628-0171
PO BOX 172, CLARKS, NE 68628-0172
PO BOX 173, CLARKS, NE 68628-0173
PO BOX 174, CLARKS, NE 68628-0174
PO BOX 175, CLARKS, NE 68628-0175
PO BOX 176, CLARKS, NE 68628-0176
PO BOX 177, CLARKS, NE 68628-0177
PO BOX 178, CLARKS, NE 68628-0178
PO BOX 179, CLARKS, NE 68628-0179
PO BOX 180, CLARKS, NE 68628-0180
PO BOX 181, CLARKS, NE 68628-0181
PO BOX 182, CLARKS, NE 68628-0182
PO BOX 183, CLARKS, NE 68628-0183
PO BOX 184, CLARKS, NE 68628-0184
PO BOX 185, CLARKS, NE 68628-0185
PO BOX 186, CLARKS, NE 68628-0186
PO BOX 187, CLARKS, NE 68628-0187
PO BOX 188, CLARKS, NE 68628-0188
PO BOX 189, CLARKS, NE 68628-0189
PO BOX 190, CLARKS, NE 68628-0190
PO BOX 191, CLARKS, NE 68628-0191
PO BOX 192, CLARKS, NE 68628-0192
PO BOX 193, CLARKS, NE 68628-0193
PO BOX 194, CLARKS, NE 68628-0194
PO BOX 195, CLARKS, NE 68628-0195
PO BOX 196, CLARKS, NE 68628-0196
PO BOX 197, CLARKS, NE 68628-0197
PO BOX 198, CLARKS, NE 68628-0198
PO BOX 199, CLARKS, NE 68628-0199
PO BOX 200, CLARKS, NE 68628-0200
PO BOX 201, CLARKS, NE 68628-0201
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