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 6, HOWELLS, NE 68641-0006
PO BOX 7, HOWELLS, NE 68641-0007
PO BOX 8, HOWELLS, NE 68641-0008
PO BOX 9, HOWELLS, NE 68641-0009
PO BOX 10, HOWELLS, NE 68641-0010
PO BOX 11, HOWELLS, NE 68641-0011
PO BOX 12, HOWELLS, NE 68641-0012
PO BOX 13, HOWELLS, NE 68641-0013
PO BOX 14, HOWELLS, NE 68641-0014
PO BOX 15, HOWELLS, NE 68641-0015
PO BOX 16, HOWELLS, NE 68641-0016
PO BOX 17, HOWELLS, NE 68641-0017
PO BOX 18, HOWELLS, NE 68641-0018
PO BOX 19, HOWELLS, NE 68641-0019
PO BOX 20, HOWELLS, NE 68641-0020
PO BOX 21, HOWELLS, NE 68641-0021
PO BOX 22, HOWELLS, NE 68641-0022
PO BOX 23, HOWELLS, NE 68641-0023
PO BOX 24, HOWELLS, NE 68641-0024
PO BOX 25, HOWELLS, NE 68641-0025
PO BOX 26, HOWELLS, NE 68641-0026
PO BOX 27, HOWELLS, NE 68641-0027
PO BOX 28, HOWELLS, NE 68641-0028
PO BOX 29, HOWELLS, NE 68641-0029
PO BOX 30, HOWELLS, NE 68641-0030
PO BOX 31, HOWELLS, NE 68641-0031
PO BOX 32, HOWELLS, NE 68641-0032
PO BOX 33, HOWELLS, NE 68641-0033
PO BOX 34, HOWELLS, NE 68641-0034
PO BOX 35, HOWELLS, NE 68641-0035
PO BOX 36, HOWELLS, NE 68641-0036
PO BOX 37, HOWELLS, NE 68641-0037
PO BOX 38, HOWELLS, NE 68641-0038
PO BOX 39, HOWELLS, NE 68641-0039
PO BOX 40, HOWELLS, NE 68641-0040
PO BOX 41, HOWELLS, NE 68641-0041
PO BOX 42, HOWELLS, NE 68641-0042
PO BOX 43, HOWELLS, NE 68641-0043
PO BOX 44, HOWELLS, NE 68641-0044
PO BOX 45, HOWELLS, NE 68641-0045
PO BOX 46, HOWELLS, NE 68641-0046
PO BOX 47, HOWELLS, NE 68641-0047
PO BOX 48, HOWELLS, NE 68641-0048
PO BOX 49, HOWELLS, NE 68641-0049
PO BOX 50, HOWELLS, NE 68641-0050
PO BOX 51, HOWELLS, NE 68641-0051
PO BOX 52, HOWELLS, NE 68641-0052
PO BOX 53, HOWELLS, NE 68641-0053
PO BOX 54, HOWELLS, NE 68641-0054
PO BOX 55, HOWELLS, NE 68641-0055
PO BOX 56, HOWELLS, NE 68641-0056
PO BOX 57, HOWELLS, NE 68641-0057
PO BOX 58, HOWELLS, NE 68641-0058
PO BOX 59, HOWELLS, NE 68641-0059
PO BOX 60, HOWELLS, NE 68641-0060
PO BOX 61, HOWELLS, NE 68641-0061
PO BOX 62, HOWELLS, NE 68641-0062
PO BOX 63, HOWELLS, NE 68641-0063
PO BOX 64, HOWELLS, NE 68641-0064
PO BOX 65, HOWELLS, NE 68641-0065
PO BOX 66, HOWELLS, NE 68641-0066
PO BOX 67, HOWELLS, NE 68641-0067
PO BOX 68, HOWELLS, NE 68641-0068
PO BOX 69, HOWELLS, NE 68641-0069
PO BOX 70, HOWELLS, NE 68641-0070
PO BOX 71, HOWELLS, NE 68641-0071
PO BOX 72, HOWELLS, NE 68641-0072
PO BOX 73, HOWELLS, NE 68641-0073
PO BOX 74, HOWELLS, NE 68641-0074
PO BOX 75, HOWELLS, NE 68641-0075
PO BOX 76, HOWELLS, NE 68641-0076
PO BOX 77, HOWELLS, NE 68641-0077
PO BOX 78, HOWELLS, NE 68641-0078
PO BOX 79, HOWELLS, NE 68641-0079
PO BOX 80, HOWELLS, NE 68641-0080
PO BOX 81, HOWELLS, NE 68641-0081
PO BOX 82, HOWELLS, NE 68641-0082
PO BOX 83, HOWELLS, NE 68641-0083
PO BOX 84, HOWELLS, NE 68641-0084
PO BOX 85, HOWELLS, NE 68641-0085
PO BOX 86, HOWELLS, NE 68641-0086
PO BOX 87, HOWELLS, NE 68641-0087
PO BOX 88, HOWELLS, NE 68641-0088
PO BOX 89, HOWELLS, NE 68641-0089
PO BOX 90, HOWELLS, NE 68641-0090
PO BOX 91, HOWELLS, NE 68641-0091
PO BOX 92, HOWELLS, NE 68641-0092
PO BOX 93, HOWELLS, NE 68641-0093
PO BOX 94, HOWELLS, NE 68641-0094
PO BOX 95, HOWELLS, NE 68641-0095
PO BOX 96, HOWELLS, NE 68641-0096
PO BOX 97, HOWELLS, NE 68641-0097
PO BOX 98, HOWELLS, NE 68641-0098
PO BOX 99, HOWELLS, NE 68641-0099
PO BOX 100, HOWELLS, NE 68641-0100
PO BOX 101, HOWELLS, NE 68641-0101
PO BOX 102, HOWELLS, NE 68641-0102
PO BOX 103, HOWELLS, NE 68641-0103
PO BOX 104, HOWELLS, NE 68641-0104
PO BOX 105, HOWELLS, NE 68641-0105
PO BOX 106, HOWELLS, NE 68641-0106
PO BOX 107, HOWELLS, NE 68641-0107
PO BOX 108, HOWELLS, NE 68641-0108
PO BOX 109, HOWELLS, NE 68641-0109
PO BOX 110, HOWELLS, NE 68641-0110
PO BOX 111, HOWELLS, NE 68641-0111
PO BOX 112, HOWELLS, NE 68641-0112
PO BOX 113, HOWELLS, NE 68641-0113
PO BOX 114, HOWELLS, NE 68641-0114
PO BOX 115, HOWELLS, NE 68641-0115
PO BOX 116, HOWELLS, NE 68641-0116
PO BOX 117, HOWELLS, NE 68641-0117
PO BOX 118, HOWELLS, NE 68641-0118
PO BOX 119, HOWELLS, NE 68641-0119
PO BOX 120, HOWELLS, NE 68641-0120
PO BOX 121, HOWELLS, NE 68641-0121
PO BOX 122, HOWELLS, NE 68641-0122
PO BOX 123, HOWELLS, NE 68641-0123
PO BOX 124, HOWELLS, NE 68641-0124
PO BOX 125, HOWELLS, NE 68641-0125
PO BOX 126, HOWELLS, NE 68641-0126
PO BOX 127, HOWELLS, NE 68641-0127
PO BOX 128, HOWELLS, NE 68641-0128
PO BOX 129, HOWELLS, NE 68641-0129
PO BOX 130, HOWELLS, NE 68641-0130
PO BOX 131, HOWELLS, NE 68641-0131
PO BOX 132, HOWELLS, NE 68641-0132
PO BOX 133, HOWELLS, NE 68641-0133
PO BOX 134, HOWELLS, NE 68641-0134
PO BOX 135, HOWELLS, NE 68641-0135
PO BOX 136, HOWELLS, NE 68641-0136
PO BOX 137, HOWELLS, NE 68641-0137
PO BOX 138, HOWELLS, NE 68641-0138
PO BOX 139, HOWELLS, NE 68641-0139
PO BOX 140, HOWELLS, NE 68641-0140
PO BOX 141, HOWELLS, NE 68641-0141
PO BOX 142, HOWELLS, NE 68641-0142
PO BOX 143, HOWELLS, NE 68641-0143
PO BOX 144, HOWELLS, NE 68641-0144
PO BOX 145, HOWELLS, NE 68641-0145
PO BOX 146, HOWELLS, NE 68641-0146
PO BOX 147, HOWELLS, NE 68641-0147
PO BOX 148, HOWELLS, NE 68641-0148
PO BOX 149, HOWELLS, NE 68641-0149
PO BOX 150, HOWELLS, NE 68641-0150
PO BOX 151, HOWELLS, NE 68641-0151
PO BOX 152, HOWELLS, NE 68641-0152
PO BOX 153, HOWELLS, NE 68641-0153
PO BOX 154, HOWELLS, NE 68641-0154
PO BOX 155, HOWELLS, NE 68641-0155
PO BOX 156, HOWELLS, NE 68641-0156
PO BOX 157, HOWELLS, NE 68641-0157
PO BOX 158, HOWELLS, NE 68641-0158
PO BOX 159, HOWELLS, NE 68641-0159
PO BOX 160, HOWELLS, NE 68641-0160
PO BOX 161, HOWELLS, NE 68641-0161
PO BOX 162, HOWELLS, NE 68641-0162
PO BOX 163, HOWELLS, NE 68641-0163
PO BOX 164, HOWELLS, NE 68641-0164
PO BOX 165, HOWELLS, NE 68641-0165
PO BOX 166, HOWELLS, NE 68641-0166
PO BOX 167, HOWELLS, NE 68641-0167
PO BOX 168, HOWELLS, NE 68641-0168
PO BOX 169, HOWELLS, NE 68641-0169
PO BOX 170, HOWELLS, NE 68641-0170
PO BOX 171, HOWELLS, NE 68641-0171
PO BOX 172, HOWELLS, NE 68641-0172
PO BOX 173, HOWELLS, NE 68641-0173
PO BOX 174, HOWELLS, NE 68641-0174
PO BOX 175, HOWELLS, NE 68641-0175
PO BOX 176, HOWELLS, NE 68641-0176
PO BOX 177, HOWELLS, NE 68641-0177
PO BOX 178, HOWELLS, NE 68641-0178
PO BOX 179, HOWELLS, NE 68641-0179
PO BOX 180, HOWELLS, NE 68641-0180
PO BOX 181, HOWELLS, NE 68641-0181
PO BOX 182, HOWELLS, NE 68641-0182
PO BOX 183, HOWELLS, NE 68641-0183
PO BOX 184, HOWELLS, NE 68641-0184
PO BOX 185, HOWELLS, NE 68641-0185
PO BOX 186, HOWELLS, NE 68641-0186
PO BOX 187, HOWELLS, NE 68641-0187
PO BOX 188, HOWELLS, NE 68641-0188
PO BOX 189, HOWELLS, NE 68641-0189
PO BOX 190, HOWELLS, NE 68641-0190
PO BOX 191, HOWELLS, NE 68641-0191
PO BOX 192, HOWELLS, NE 68641-0192
PO BOX 193, HOWELLS, NE 68641-0193
PO BOX 194, HOWELLS, NE 68641-0194
PO BOX 195, HOWELLS, NE 68641-0195
PO BOX 196, HOWELLS, NE 68641-0196
PO BOX 197, HOWELLS, NE 68641-0197
PO BOX 198, HOWELLS, NE 68641-0198
PO BOX 199, HOWELLS, NE 68641-0199
PO BOX 200, HOWELLS, NE 68641-0200
PO BOX 201, HOWELLS, NE 68641-0201
PO BOX 202, HOWELLS, NE 68641-0202
PO BOX 203, HOWELLS, NE 68641-0203
PO BOX 204, HOWELLS, NE 68641-0204
PO BOX 205, HOWELLS, NE 68641-0205
PO BOX 206, HOWELLS, NE 68641-0206
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