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, COUNCIL BLUFFS, IA 51502-0001
PO BOX 2, COUNCIL BLUFFS, IA 51502-0002
PO BOX 3, COUNCIL BLUFFS, IA 51502-0003
PO BOX 4, COUNCIL BLUFFS, IA 51502-0004
PO BOX 5, COUNCIL BLUFFS, IA 51502-0005
PO BOX 6, COUNCIL BLUFFS, IA 51502-0006
PO BOX 7, COUNCIL BLUFFS, IA 51502-0007
PO BOX 8, COUNCIL BLUFFS, IA 51502-0008
PO BOX 9, COUNCIL BLUFFS, IA 51502-0009
PO BOX 10, COUNCIL BLUFFS, IA 51502-0010
PO BOX 11, COUNCIL BLUFFS, IA 51502-0011
PO BOX 12, COUNCIL BLUFFS, IA 51502-0012
PO BOX 13, COUNCIL BLUFFS, IA 51502-0013
PO BOX 14, COUNCIL BLUFFS, IA 51502-0014
PO BOX 15, COUNCIL BLUFFS, IA 51502-0015
PO BOX 16, COUNCIL BLUFFS, IA 51502-0016
PO BOX 17, COUNCIL BLUFFS, IA 51502-0017
PO BOX 18, COUNCIL BLUFFS, IA 51502-0018
PO BOX 19, COUNCIL BLUFFS, IA 51502-0019
PO BOX 20, COUNCIL BLUFFS, IA 51502-0020
PO BOX 21, COUNCIL BLUFFS, IA 51502-0021
PO BOX 22, COUNCIL BLUFFS, IA 51502-0022
PO BOX 23, COUNCIL BLUFFS, IA 51502-0023
PO BOX 24, COUNCIL BLUFFS, IA 51502-0024
PO BOX 25, COUNCIL BLUFFS, IA 51502-0025
PO BOX 26, COUNCIL BLUFFS, IA 51502-0026
PO BOX 27, COUNCIL BLUFFS, IA 51502-0027
PO BOX 28, COUNCIL BLUFFS, IA 51502-0028
PO BOX 29, COUNCIL BLUFFS, IA 51502-0029
PO BOX 30, COUNCIL BLUFFS, IA 51502-0030
PO BOX 31, COUNCIL BLUFFS, IA 51502-0031
PO BOX 32, COUNCIL BLUFFS, IA 51502-0032
PO BOX 33, COUNCIL BLUFFS, IA 51502-0033
PO BOX 34, COUNCIL BLUFFS, IA 51502-0034
PO BOX 35, COUNCIL BLUFFS, IA 51502-0035
PO BOX 36, COUNCIL BLUFFS, IA 51502-0036
PO BOX 37, COUNCIL BLUFFS, IA 51502-0037
PO BOX 38, COUNCIL BLUFFS, IA 51502-0038
PO BOX 39, COUNCIL BLUFFS, IA 51502-0039
PO BOX 40, COUNCIL BLUFFS, IA 51502-0040
PO BOX 41, COUNCIL BLUFFS, IA 51502-0041
PO BOX 42, COUNCIL BLUFFS, IA 51502-0042
PO BOX 43, COUNCIL BLUFFS, IA 51502-0043
PO BOX 44, COUNCIL BLUFFS, IA 51502-0044
PO BOX 45, COUNCIL BLUFFS, IA 51502-0045
PO BOX 46, COUNCIL BLUFFS, IA 51502-0046
PO BOX 47, COUNCIL BLUFFS, IA 51502-0047
PO BOX 48, COUNCIL BLUFFS, IA 51502-0048
PO BOX 49, COUNCIL BLUFFS, IA 51502-0049
PO BOX 50, COUNCIL BLUFFS, IA 51502-0050
PO BOX 51, COUNCIL BLUFFS, IA 51502-0051
PO BOX 52, COUNCIL BLUFFS, IA 51502-0052
PO BOX 53, COUNCIL BLUFFS, IA 51502-0053
PO BOX 54, COUNCIL BLUFFS, IA 51502-0054
PO BOX 55, COUNCIL BLUFFS, IA 51502-0055
PO BOX 56, COUNCIL BLUFFS, IA 51502-0056
PO BOX 57, COUNCIL BLUFFS, IA 51502-0057
PO BOX 58, COUNCIL BLUFFS, IA 51502-0058
PO BOX 59, COUNCIL BLUFFS, IA 51502-0059
PO BOX 60, COUNCIL BLUFFS, IA 51502-0060
PO BOX 61, COUNCIL BLUFFS, IA 51502-0061
PO BOX 62, COUNCIL BLUFFS, IA 51502-0062
PO BOX 63, COUNCIL BLUFFS, IA 51502-0063
PO BOX 64, COUNCIL BLUFFS, IA 51502-0064
PO BOX 65, COUNCIL BLUFFS, IA 51502-0065
PO BOX 66, COUNCIL BLUFFS, IA 51502-0066
PO BOX 67, COUNCIL BLUFFS, IA 51502-0067
PO BOX 68, COUNCIL BLUFFS, IA 51502-0068
PO BOX 69, COUNCIL BLUFFS, IA 51502-0069
PO BOX 70, COUNCIL BLUFFS, IA 51502-0070
PO BOX 71, COUNCIL BLUFFS, IA 51502-0071
PO BOX 72, COUNCIL BLUFFS, IA 51502-0072
PO BOX 73, COUNCIL BLUFFS, IA 51502-0073
PO BOX 74, COUNCIL BLUFFS, IA 51502-0074
PO BOX 75, COUNCIL BLUFFS, IA 51502-0075
PO BOX 76, COUNCIL BLUFFS, IA 51502-0076
PO BOX 77, COUNCIL BLUFFS, IA 51502-0077
PO BOX 78, COUNCIL BLUFFS, IA 51502-0078
PO BOX 79, COUNCIL BLUFFS, IA 51502-0079
PO BOX 80, COUNCIL BLUFFS, IA 51502-0080
PO BOX 81, COUNCIL BLUFFS, IA 51502-0081
PO BOX 82, COUNCIL BLUFFS, IA 51502-0082
PO BOX 83, COUNCIL BLUFFS, IA 51502-0083
PO BOX 84, COUNCIL BLUFFS, IA 51502-0084
PO BOX 85, COUNCIL BLUFFS, IA 51502-0085
PO BOX 86, COUNCIL BLUFFS, IA 51502-0086
PO BOX 87, COUNCIL BLUFFS, IA 51502-0087
PO BOX 88, COUNCIL BLUFFS, IA 51502-0088
PO BOX 89, COUNCIL BLUFFS, IA 51502-0089
PO BOX 90, COUNCIL BLUFFS, IA 51502-0090
PO BOX 91, COUNCIL BLUFFS, IA 51502-0091
PO BOX 92, COUNCIL BLUFFS, IA 51502-0092
PO BOX 93, COUNCIL BLUFFS, IA 51502-0093
PO BOX 94, COUNCIL BLUFFS, IA 51502-0094
PO BOX 95, COUNCIL BLUFFS, IA 51502-0095
PO BOX 96, COUNCIL BLUFFS, IA 51502-0096
PO BOX 97, COUNCIL BLUFFS, IA 51502-0097
PO BOX 98, COUNCIL BLUFFS, IA 51502-0098
PO BOX 99, COUNCIL BLUFFS, IA 51502-0099
PO BOX 100, COUNCIL BLUFFS, IA 51502-0100
PO BOX 101, COUNCIL BLUFFS, IA 51502-0101
PO BOX 102, COUNCIL BLUFFS, IA 51502-0102
PO BOX 103, COUNCIL BLUFFS, IA 51502-0103
PO BOX 104, COUNCIL BLUFFS, IA 51502-0104
PO BOX 105, COUNCIL BLUFFS, IA 51502-0105
PO BOX 106, COUNCIL BLUFFS, IA 51502-0106
PO BOX 107, COUNCIL BLUFFS, IA 51502-0107
PO BOX 108, COUNCIL BLUFFS, IA 51502-0108
PO BOX 109, COUNCIL BLUFFS, IA 51502-0109
PO BOX 110, COUNCIL BLUFFS, IA 51502-0110
PO BOX 111, COUNCIL BLUFFS, IA 51502-0111
PO BOX 112, COUNCIL BLUFFS, IA 51502-0112
PO BOX 113, COUNCIL BLUFFS, IA 51502-0113
PO BOX 114, COUNCIL BLUFFS, IA 51502-0114
PO BOX 115, COUNCIL BLUFFS, IA 51502-0115
PO BOX 116, COUNCIL BLUFFS, IA 51502-0116
PO BOX 117, COUNCIL BLUFFS, IA 51502-0117
PO BOX 118, COUNCIL BLUFFS, IA 51502-0118
PO BOX 119, COUNCIL BLUFFS, IA 51502-0119
PO BOX 120, COUNCIL BLUFFS, IA 51502-0120
PO BOX 121, COUNCIL BLUFFS, IA 51502-0121
PO BOX 122, COUNCIL BLUFFS, IA 51502-0122
PO BOX 123, COUNCIL BLUFFS, IA 51502-0123
PO BOX 124, COUNCIL BLUFFS, IA 51502-0124
PO BOX 125, COUNCIL BLUFFS, IA 51502-0125
PO BOX 126, COUNCIL BLUFFS, IA 51502-0126
PO BOX 127, COUNCIL BLUFFS, IA 51502-0127
PO BOX 128, COUNCIL BLUFFS, IA 51502-0128
PO BOX 129, COUNCIL BLUFFS, IA 51502-0129
PO BOX 130, COUNCIL BLUFFS, IA 51502-0130
PO BOX 131, COUNCIL BLUFFS, IA 51502-0131
PO BOX 132, COUNCIL BLUFFS, IA 51502-0132
PO BOX 133, COUNCIL BLUFFS, IA 51502-0133
PO BOX 134, COUNCIL BLUFFS, IA 51502-0134
PO BOX 135, COUNCIL BLUFFS, IA 51502-0135
PO BOX 136, COUNCIL BLUFFS, IA 51502-0136
PO BOX 137, COUNCIL BLUFFS, IA 51502-0137
PO BOX 138, COUNCIL BLUFFS, IA 51502-0138
PO BOX 139, COUNCIL BLUFFS, IA 51502-0139
PO BOX 140, COUNCIL BLUFFS, IA 51502-0140
PO BOX 141, COUNCIL BLUFFS, IA 51502-0141
PO BOX 142, COUNCIL BLUFFS, IA 51502-0142
PO BOX 143, COUNCIL BLUFFS, IA 51502-0143
PO BOX 144, COUNCIL BLUFFS, IA 51502-0144
PO BOX 145, COUNCIL BLUFFS, IA 51502-0145
PO BOX 146, COUNCIL BLUFFS, IA 51502-0146
PO BOX 147, COUNCIL BLUFFS, IA 51502-0147
PO BOX 148, COUNCIL BLUFFS, IA 51502-0148
PO BOX 149, COUNCIL BLUFFS, IA 51502-0149
PO BOX 150, COUNCIL BLUFFS, IA 51502-0150
PO BOX 151, COUNCIL BLUFFS, IA 51502-0151
PO BOX 152, COUNCIL BLUFFS, IA 51502-0152
PO BOX 153, COUNCIL BLUFFS, IA 51502-0153
PO BOX 154, COUNCIL BLUFFS, IA 51502-0154
PO BOX 155, COUNCIL BLUFFS, IA 51502-0155
PO BOX 156, COUNCIL BLUFFS, IA 51502-0156
PO BOX 157, COUNCIL BLUFFS, IA 51502-0157
PO BOX 158, COUNCIL BLUFFS, IA 51502-0158
PO BOX 159, COUNCIL BLUFFS, IA 51502-0159
PO BOX 160, COUNCIL BLUFFS, IA 51502-0160
PO BOX 161, COUNCIL BLUFFS, IA 51502-0161
PO BOX 162, COUNCIL BLUFFS, IA 51502-0162
PO BOX 163, COUNCIL BLUFFS, IA 51502-0163
PO BOX 164, COUNCIL BLUFFS, IA 51502-0164
PO BOX 165, COUNCIL BLUFFS, IA 51502-0165
PO BOX 166, COUNCIL BLUFFS, IA 51502-0166
PO BOX 167, COUNCIL BLUFFS, IA 51502-0167
PO BOX 168, COUNCIL BLUFFS, IA 51502-0168
PO BOX 169, COUNCIL BLUFFS, IA 51502-0169
PO BOX 170, COUNCIL BLUFFS, IA 51502-0170
PO BOX 171, COUNCIL BLUFFS, IA 51502-0171
PO BOX 172, COUNCIL BLUFFS, IA 51502-0172
PO BOX 173, COUNCIL BLUFFS, IA 51502-0173
PO BOX 174, COUNCIL BLUFFS, IA 51502-0174
PO BOX 175, COUNCIL BLUFFS, IA 51502-0175
PO BOX 176, COUNCIL BLUFFS, IA 51502-0176
PO BOX 177, COUNCIL BLUFFS, IA 51502-0177
PO BOX 178, COUNCIL BLUFFS, IA 51502-0178
PO BOX 179, COUNCIL BLUFFS, IA 51502-0179
PO BOX 180, COUNCIL BLUFFS, IA 51502-0180
PO BOX 181, COUNCIL BLUFFS, IA 51502-0181
PO BOX 182, COUNCIL BLUFFS, IA 51502-0182
PO BOX 183, COUNCIL BLUFFS, IA 51502-0183
PO BOX 184, COUNCIL BLUFFS, IA 51502-0184
PO BOX 185, COUNCIL BLUFFS, IA 51502-0185
PO BOX 186, COUNCIL BLUFFS, IA 51502-0186
PO BOX 187, COUNCIL BLUFFS, IA 51502-0187
PO BOX 188, COUNCIL BLUFFS, IA 51502-0188
PO BOX 189, COUNCIL BLUFFS, IA 51502-0189
PO BOX 190, COUNCIL BLUFFS, IA 51502-0190
PO BOX 191, COUNCIL BLUFFS, IA 51502-0191
PO BOX 192, COUNCIL BLUFFS, IA 51502-0192
PO BOX 193, COUNCIL BLUFFS, IA 51502-0193
PO BOX 194, COUNCIL BLUFFS, IA 51502-0194
PO BOX 195, COUNCIL BLUFFS, IA 51502-0195
PO BOX 196, COUNCIL BLUFFS, IA 51502-0196
PO BOX 197, COUNCIL BLUFFS, IA 51502-0197
PO BOX 198, COUNCIL BLUFFS, IA 51502-0198
PO BOX 199, COUNCIL BLUFFS, IA 51502-0199
PO BOX 200, COUNCIL BLUFFS, IA 51502-0200
PO BOX 201, COUNCIL BLUFFS, IA 51502-0201
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