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, SPENCER, NE 68777-0001
PO BOX 2, SPENCER, NE 68777-0002
PO BOX 3, SPENCER, NE 68777-0003
PO BOX 4, SPENCER, NE 68777-0004
PO BOX 5, SPENCER, NE 68777-0005
PO BOX 6, SPENCER, NE 68777-0006
PO BOX 7, SPENCER, NE 68777-0007
PO BOX 8, SPENCER, NE 68777-0008
PO BOX 9, SPENCER, NE 68777-0009
PO BOX 10, SPENCER, NE 68777-0010
PO BOX 11, SPENCER, NE 68777-0011
PO BOX 12, SPENCER, NE 68777-0012
PO BOX 13, SPENCER, NE 68777-0013
PO BOX 14, SPENCER, NE 68777-0014
PO BOX 15, SPENCER, NE 68777-0015
PO BOX 16, SPENCER, NE 68777-0016
PO BOX 17, SPENCER, NE 68777-0017
PO BOX 18, SPENCER, NE 68777-0018
PO BOX 19, SPENCER, NE 68777-0019
PO BOX 20, SPENCER, NE 68777-0020
PO BOX 21, SPENCER, NE 68777-0021
PO BOX 22, SPENCER, NE 68777-0022
PO BOX 23, SPENCER, NE 68777-0023
PO BOX 24, SPENCER, NE 68777-0024
PO BOX 25, SPENCER, NE 68777-0025
PO BOX 26, SPENCER, NE 68777-0026
PO BOX 27, SPENCER, NE 68777-0027
PO BOX 28, SPENCER, NE 68777-0028
PO BOX 29, SPENCER, NE 68777-0029
PO BOX 30, SPENCER, NE 68777-0030
PO BOX 31, SPENCER, NE 68777-0031
PO BOX 32, SPENCER, NE 68777-0032
PO BOX 33, SPENCER, NE 68777-0033
PO BOX 34, SPENCER, NE 68777-0034
PO BOX 35, SPENCER, NE 68777-0035
PO BOX 36, SPENCER, NE 68777-0036
PO BOX 37, SPENCER, NE 68777-0037
PO BOX 38, SPENCER, NE 68777-0038
PO BOX 39, SPENCER, NE 68777-0039
PO BOX 40, SPENCER, NE 68777-0040
PO BOX 41, SPENCER, NE 68777-0041
PO BOX 42, SPENCER, NE 68777-0042
PO BOX 43, SPENCER, NE 68777-0043
PO BOX 44, SPENCER, NE 68777-0044
PO BOX 45, SPENCER, NE 68777-0045
PO BOX 46, SPENCER, NE 68777-0046
PO BOX 47, SPENCER, NE 68777-0047
PO BOX 48, SPENCER, NE 68777-0048
PO BOX 49, SPENCER, NE 68777-0049
PO BOX 50, SPENCER, NE 68777-0050
PO BOX 51, SPENCER, NE 68777-0051
PO BOX 52, SPENCER, NE 68777-0052
PO BOX 53, SPENCER, NE 68777-0053
PO BOX 54, SPENCER, NE 68777-0054
PO BOX 55, SPENCER, NE 68777-0055
PO BOX 56, SPENCER, NE 68777-0056
PO BOX 57, SPENCER, NE 68777-0057
PO BOX 58, SPENCER, NE 68777-0058
PO BOX 59, SPENCER, NE 68777-0059
PO BOX 60, SPENCER, NE 68777-0060
PO BOX 61, SPENCER, NE 68777-0061
PO BOX 62, SPENCER, NE 68777-0062
PO BOX 63, SPENCER, NE 68777-0063
PO BOX 64, SPENCER, NE 68777-0064
PO BOX 65, SPENCER, NE 68777-0065
PO BOX 66, SPENCER, NE 68777-0066
PO BOX 67, SPENCER, NE 68777-0067
PO BOX 68, SPENCER, NE 68777-0068
PO BOX 69, SPENCER, NE 68777-0069
PO BOX 70, SPENCER, NE 68777-0070
PO BOX 71, SPENCER, NE 68777-0071
PO BOX 72, SPENCER, NE 68777-0072
PO BOX 73, SPENCER, NE 68777-0073
PO BOX 74, SPENCER, NE 68777-0074
PO BOX 75, SPENCER, NE 68777-0075
PO BOX 76, SPENCER, NE 68777-0076
PO BOX 77, SPENCER, NE 68777-0077
PO BOX 78, SPENCER, NE 68777-0078
PO BOX 79, SPENCER, NE 68777-0079
PO BOX 80, SPENCER, NE 68777-0080
PO BOX 81, SPENCER, NE 68777-0081
PO BOX 82, SPENCER, NE 68777-0082
PO BOX 83, SPENCER, NE 68777-0083
PO BOX 84, SPENCER, NE 68777-0084
PO BOX 85, SPENCER, NE 68777-0085
PO BOX 86, SPENCER, NE 68777-0086
PO BOX 87, SPENCER, NE 68777-0087
PO BOX 88, SPENCER, NE 68777-0088
PO BOX 89, SPENCER, NE 68777-0089
PO BOX 90, SPENCER, NE 68777-0090
PO BOX 91, SPENCER, NE 68777-0091
PO BOX 92, SPENCER, NE 68777-0092
PO BOX 93, SPENCER, NE 68777-0093
PO BOX 94, SPENCER, NE 68777-0094
PO BOX 95, SPENCER, NE 68777-0095
PO BOX 96, SPENCER, NE 68777-0096
PO BOX 97, SPENCER, NE 68777-0097
PO BOX 98, SPENCER, NE 68777-0098
PO BOX 99, SPENCER, NE 68777-0099
PO BOX 100, SPENCER, NE 68777-0100
PO BOX 101, SPENCER, NE 68777-0101
PO BOX 102, SPENCER, NE 68777-0102
PO BOX 103, SPENCER, NE 68777-0103
PO BOX 104, SPENCER, NE 68777-0104
PO BOX 105, SPENCER, NE 68777-0105
PO BOX 106, SPENCER, NE 68777-0106
PO BOX 107, SPENCER, NE 68777-0107
PO BOX 108, SPENCER, NE 68777-0108
PO BOX 109, SPENCER, NE 68777-0109
PO BOX 110, SPENCER, NE 68777-0110
PO BOX 111, SPENCER, NE 68777-0111
PO BOX 112, SPENCER, NE 68777-0112
PO BOX 113, SPENCER, NE 68777-0113
PO BOX 114, SPENCER, NE 68777-0114
PO BOX 115, SPENCER, NE 68777-0115
PO BOX 116, SPENCER, NE 68777-0116
PO BOX 117, SPENCER, NE 68777-0117
PO BOX 118, SPENCER, NE 68777-0118
PO BOX 119, SPENCER, NE 68777-0119
PO BOX 120, SPENCER, NE 68777-0120
PO BOX 121, SPENCER, NE 68777-0121
PO BOX 122, SPENCER, NE 68777-0122
PO BOX 123, SPENCER, NE 68777-0123
PO BOX 124, SPENCER, NE 68777-0124
PO BOX 125, SPENCER, NE 68777-0125
PO BOX 126, SPENCER, NE 68777-0126
PO BOX 127, SPENCER, NE 68777-0127
PO BOX 128, SPENCER, NE 68777-0128
PO BOX 129, SPENCER, NE 68777-0129
PO BOX 130, SPENCER, NE 68777-0130
PO BOX 131, SPENCER, NE 68777-0131
PO BOX 132, SPENCER, NE 68777-0132
PO BOX 133, SPENCER, NE 68777-0133
PO BOX 134, SPENCER, NE 68777-0134
PO BOX 135, SPENCER, NE 68777-0135
PO BOX 136, SPENCER, NE 68777-0136
PO BOX 137, SPENCER, NE 68777-0137
PO BOX 138, SPENCER, NE 68777-0138
PO BOX 139, SPENCER, NE 68777-0139
PO BOX 140, SPENCER, NE 68777-0140
PO BOX 141, SPENCER, NE 68777-0141
PO BOX 142, SPENCER, NE 68777-0142
PO BOX 143, SPENCER, NE 68777-0143
PO BOX 144, SPENCER, NE 68777-0144
PO BOX 145, SPENCER, NE 68777-0145
PO BOX 146, SPENCER, NE 68777-0146
PO BOX 147, SPENCER, NE 68777-0147
PO BOX 148, SPENCER, NE 68777-0148
PO BOX 149, SPENCER, NE 68777-0149
PO BOX 150, SPENCER, NE 68777-0150
PO BOX 151, SPENCER, NE 68777-0151
PO BOX 152, SPENCER, NE 68777-0152
PO BOX 153, SPENCER, NE 68777-0153
PO BOX 154, SPENCER, NE 68777-0154
PO BOX 155, SPENCER, NE 68777-0155
PO BOX 156, SPENCER, NE 68777-0156
PO BOX 157, SPENCER, NE 68777-0157
PO BOX 158, SPENCER, NE 68777-0158
PO BOX 159, SPENCER, NE 68777-0159
PO BOX 160, SPENCER, NE 68777-0160
PO BOX 161, SPENCER, NE 68777-0161
PO BOX 162, SPENCER, NE 68777-0162
PO BOX 163, SPENCER, NE 68777-0163
PO BOX 164, SPENCER, NE 68777-0164
PO BOX 165, SPENCER, NE 68777-0165
PO BOX 166, SPENCER, NE 68777-0166
PO BOX 167, SPENCER, NE 68777-0167
PO BOX 168, SPENCER, NE 68777-0168
PO BOX 169, SPENCER, NE 68777-0169
PO BOX 170, SPENCER, NE 68777-0170
PO BOX 171, SPENCER, NE 68777-0171
PO BOX 172, SPENCER, NE 68777-0172
PO BOX 173, SPENCER, NE 68777-0173
PO BOX 174, SPENCER, NE 68777-0174
PO BOX 175, SPENCER, NE 68777-0175
PO BOX 176, SPENCER, NE 68777-0176
PO BOX 177, SPENCER, NE 68777-0177
PO BOX 178, SPENCER, NE 68777-0178
PO BOX 179, SPENCER, NE 68777-0179
PO BOX 180, SPENCER, NE 68777-0180
PO BOX 181, SPENCER, NE 68777-0181
PO BOX 182, SPENCER, NE 68777-0182
PO BOX 183, SPENCER, NE 68777-0183
PO BOX 184, SPENCER, NE 68777-0184
PO BOX 185, SPENCER, NE 68777-0185
PO BOX 186, SPENCER, NE 68777-0186
PO BOX 187, SPENCER, NE 68777-0187
PO BOX 188, SPENCER, NE 68777-0188
PO BOX 189, SPENCER, NE 68777-0189
PO BOX 190, SPENCER, NE 68777-0190
PO BOX 191, SPENCER, NE 68777-0191
PO BOX 192, SPENCER, NE 68777-0192
PO BOX 193, SPENCER, NE 68777-0193
PO BOX 194, SPENCER, NE 68777-0194
PO BOX 195, SPENCER, NE 68777-0195
PO BOX 196, SPENCER, NE 68777-0196
PO BOX 197, SPENCER, NE 68777-0197
PO BOX 198, SPENCER, NE 68777-0198
PO BOX 199, SPENCER, NE 68777-0199
PO BOX 200, SPENCER, NE 68777-0200
PO BOX 201, SPENCER, NE 68777-0201
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