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, COULTER, IA 50431-0001
PO BOX 2, COULTER, IA 50431-0002
PO BOX 3, COULTER, IA 50431-0003
PO BOX 4, COULTER, IA 50431-0004
PO BOX 5, COULTER, IA 50431-0005
PO BOX 6, COULTER, IA 50431-0006
PO BOX 7, COULTER, IA 50431-0007
PO BOX 8, COULTER, IA 50431-0008
PO BOX 9, COULTER, IA 50431-0009
PO BOX 10, COULTER, IA 50431-0010
PO BOX 11, COULTER, IA 50431-0011
PO BOX 12, COULTER, IA 50431-0012
PO BOX 13, COULTER, IA 50431-0013
PO BOX 14, COULTER, IA 50431-0014
PO BOX 15, COULTER, IA 50431-0015
PO BOX 16, COULTER, IA 50431-0016
PO BOX 17, COULTER, IA 50431-0017
PO BOX 18, COULTER, IA 50431-0018
PO BOX 19, COULTER, IA 50431-0019
PO BOX 20, COULTER, IA 50431-0020
PO BOX 21, COULTER, IA 50431-0021
PO BOX 22, COULTER, IA 50431-0022
PO BOX 23, COULTER, IA 50431-0023
PO BOX 24, COULTER, IA 50431-0024
PO BOX 25, COULTER, IA 50431-0025
PO BOX 26, COULTER, IA 50431-0026
PO BOX 27, COULTER, IA 50431-0027
PO BOX 28, COULTER, IA 50431-0028
PO BOX 29, COULTER, IA 50431-0029
PO BOX 30, COULTER, IA 50431-0030
PO BOX 31, COULTER, IA 50431-0031
PO BOX 32, COULTER, IA 50431-0032
PO BOX 33, COULTER, IA 50431-0033
PO BOX 34, COULTER, IA 50431-0034
PO BOX 35, COULTER, IA 50431-0035
PO BOX 36, COULTER, IA 50431-0036
PO BOX 37, COULTER, IA 50431-0037
PO BOX 38, COULTER, IA 50431-0038
PO BOX 39, COULTER, IA 50431-0039
PO BOX 40, COULTER, IA 50431-0040
PO BOX 41, COULTER, IA 50431-0041
PO BOX 42, COULTER, IA 50431-0042
PO BOX 43, COULTER, IA 50431-0043
PO BOX 44, COULTER, IA 50431-0044
PO BOX 45, COULTER, IA 50431-0045
PO BOX 46, COULTER, IA 50431-0046
PO BOX 47, COULTER, IA 50431-0047
PO BOX 48, COULTER, IA 50431-0048
PO BOX 49, COULTER, IA 50431-0049
PO BOX 50, COULTER, IA 50431-0050
PO BOX 51, COULTER, IA 50431-0051
PO BOX 52, COULTER, IA 50431-0052
PO BOX 53, COULTER, IA 50431-0053
PO BOX 54, COULTER, IA 50431-0054
PO BOX 55, COULTER, IA 50431-0055
PO BOX 56, COULTER, IA 50431-0056
PO BOX 57, COULTER, IA 50431-0057
PO BOX 58, COULTER, IA 50431-0058
PO BOX 59, COULTER, IA 50431-0059
PO BOX 60, COULTER, IA 50431-0060
PO BOX 61, COULTER, IA 50431-0061
PO BOX 62, COULTER, IA 50431-0062
PO BOX 63, COULTER, IA 50431-0063
PO BOX 64, COULTER, IA 50431-0064
PO BOX 65, COULTER, IA 50431-0065
PO BOX 66, COULTER, IA 50431-0066
PO BOX 67, COULTER, IA 50431-0067
PO BOX 68, COULTER, IA 50431-0068
PO BOX 69, COULTER, IA 50431-0069
PO BOX 70, COULTER, IA 50431-0070
PO BOX 71, COULTER, IA 50431-0071
PO BOX 72, COULTER, IA 50431-0072
PO BOX 73, COULTER, IA 50431-0073
PO BOX 74, COULTER, IA 50431-0074
PO BOX 75, COULTER, IA 50431-0075
PO BOX 76, COULTER, IA 50431-0076
PO BOX 77, COULTER, IA 50431-0077
PO BOX 78, COULTER, IA 50431-0078
PO BOX 79, COULTER, IA 50431-0079
PO BOX 80, COULTER, IA 50431-0080
PO BOX 81, COULTER, IA 50431-0081
PO BOX 82, COULTER, IA 50431-0082
PO BOX 83, COULTER, IA 50431-0083
PO BOX 84, COULTER, IA 50431-0084
PO BOX 85, COULTER, IA 50431-0085
PO BOX 86, COULTER, IA 50431-0086
PO BOX 87, COULTER, IA 50431-0087
PO BOX 88, COULTER, IA 50431-0088
PO BOX 89, COULTER, IA 50431-0089
PO BOX 90, COULTER, IA 50431-0090
PO BOX 91, COULTER, IA 50431-0091
PO BOX 92, COULTER, IA 50431-0092
PO BOX 93, COULTER, IA 50431-0093
PO BOX 94, COULTER, IA 50431-0094
PO BOX 95, COULTER, IA 50431-0095
PO BOX 96, COULTER, IA 50431-0096
PO BOX 97, COULTER, IA 50431-0097
PO BOX 98, COULTER, IA 50431-0098
PO BOX 99, COULTER, IA 50431-0099
PO BOX 100, COULTER, IA 50431-0100
PO BOX 101, COULTER, IA 50431-0101
PO BOX 102, COULTER, IA 50431-0102
PO BOX 103, COULTER, IA 50431-0103
PO BOX 104, COULTER, IA 50431-0104
PO BOX 105, COULTER, IA 50431-0105
PO BOX 106, COULTER, IA 50431-0106
PO BOX 107, COULTER, IA 50431-0107
PO BOX 108, COULTER, IA 50431-0108
PO BOX 109, COULTER, IA 50431-0109
PO BOX 110, COULTER, IA 50431-0110
PO BOX 111, COULTER, IA 50431-0111
PO BOX 112, COULTER, IA 50431-0112
PO BOX 113, COULTER, IA 50431-0113
PO BOX 114, COULTER, IA 50431-0114
PO BOX 115, COULTER, IA 50431-0115
PO BOX 116, COULTER, IA 50431-0116
PO BOX 117, COULTER, IA 50431-0117
PO BOX 118, COULTER, IA 50431-0118
PO BOX 119, COULTER, IA 50431-0119
PO BOX 120, COULTER, IA 50431-0120
PO BOX 121, COULTER, IA 50431-0121
PO BOX 122, COULTER, IA 50431-0122
PO BOX 123, COULTER, IA 50431-0123
PO BOX 124, COULTER, IA 50431-0124
PO BOX 125, COULTER, IA 50431-0125
PO BOX 126, COULTER, IA 50431-0126
PO BOX 127, COULTER, IA 50431-0127
PO BOX 128, COULTER, IA 50431-0128
PO BOX 129, COULTER, IA 50431-0129
PO BOX 130, COULTER, IA 50431-0130
PO BOX 131, COULTER, IA 50431-0131
PO BOX 132, COULTER, IA 50431-0132
PO BOX 133, COULTER, IA 50431-0133
PO BOX 134, COULTER, IA 50431-0134
PO BOX 135, COULTER, IA 50431-0135
PO BOX 136, COULTER, IA 50431-0136
PO BOX 137, COULTER, IA 50431-0137
PO BOX 138, COULTER, IA 50431-0138
PO BOX 139, COULTER, IA 50431-0139
PO BOX 140, COULTER, IA 50431-0140
PO BOX 141, COULTER, IA 50431-0141
PO BOX 142, COULTER, IA 50431-0142
PO BOX 143, COULTER, IA 50431-0143
PO BOX 144, COULTER, IA 50431-0144
PO BOX 145, COULTER, IA 50431-0145
PO BOX 146, COULTER, IA 50431-0146
PO BOX 147, COULTER, IA 50431-0147
PO BOX 148, COULTER, IA 50431-0148
PO BOX 149, COULTER, IA 50431-0149
PO BOX 150, COULTER, IA 50431-0150
PO BOX 151, COULTER, IA 50431-0151
PO BOX 152, COULTER, IA 50431-0152
PO BOX 153, COULTER, IA 50431-0153
PO BOX 154, COULTER, IA 50431-0154
PO BOX 155, COULTER, IA 50431-0155
PO BOX 156, COULTER, IA 50431-0156
PO BOX 157, COULTER, IA 50431-0157
PO BOX 158, COULTER, IA 50431-0158
PO BOX 159, COULTER, IA 50431-0159
PO BOX 160, COULTER, IA 50431-0160
PO BOX 161, COULTER, IA 50431-0161
PO BOX 162, COULTER, IA 50431-0162
PO BOX 163, COULTER, IA 50431-0163
PO BOX 164, COULTER, IA 50431-0164
PO BOX 165, COULTER, IA 50431-0165
PO BOX 166, COULTER, IA 50431-0166
PO BOX 167, COULTER, IA 50431-0167
PO BOX 168, COULTER, IA 50431-0168
PO BOX 169, COULTER, IA 50431-0169
PO BOX 170, COULTER, IA 50431-0170
PO BOX 171, COULTER, IA 50431-0171
PO BOX 172, COULTER, IA 50431-0172
PO BOX 173, COULTER, IA 50431-0173
PO BOX 174, COULTER, IA 50431-0174
PO BOX 175, COULTER, IA 50431-0175
PO BOX 176, COULTER, IA 50431-0176
PO BOX 177, COULTER, IA 50431-0177
PO BOX 178, COULTER, IA 50431-0178
PO BOX 179, COULTER, IA 50431-0179
PO BOX 180, COULTER, IA 50431-0180
PO BOX 181, COULTER, IA 50431-0181
PO BOX 182, COULTER, IA 50431-0182
PO BOX 183, COULTER, IA 50431-0183
PO BOX 184, COULTER, IA 50431-0184
PO BOX 185, COULTER, IA 50431-0185
PO BOX 186, COULTER, IA 50431-0186
PO BOX 187, COULTER, IA 50431-0187
PO BOX 188, COULTER, IA 50431-0188
PO BOX 189, COULTER, IA 50431-0189
PO BOX 190, COULTER, IA 50431-0190
PO BOX 191, COULTER, IA 50431-0191
PO BOX 192, COULTER, IA 50431-0192
PO BOX 193, COULTER, IA 50431-0193
PO BOX 194, COULTER, IA 50431-0194
PO BOX 195, COULTER, IA 50431-0195
PO BOX 196, COULTER, IA 50431-0196
PO BOX 197, COULTER, IA 50431-0197
PO BOX 198, COULTER, IA 50431-0198
PO BOX 199, COULTER, IA 50431-0199
PO BOX 200, COULTER, IA 50431-0200
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