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, PLAINFIELD, IA 50666-0001
PO BOX 2, PLAINFIELD, IA 50666-0002
PO BOX 3, PLAINFIELD, IA 50666-0003
PO BOX 4, PLAINFIELD, IA 50666-0004
PO BOX 5, PLAINFIELD, IA 50666-0005
PO BOX 6, PLAINFIELD, IA 50666-0006
PO BOX 7, PLAINFIELD, IA 50666-0007
PO BOX 8, PLAINFIELD, IA 50666-0008
PO BOX 9, PLAINFIELD, IA 50666-0009
PO BOX 10, PLAINFIELD, IA 50666-0010
PO BOX 11, PLAINFIELD, IA 50666-0011
PO BOX 12, PLAINFIELD, IA 50666-0012
PO BOX 13, PLAINFIELD, IA 50666-0013
PO BOX 14, PLAINFIELD, IA 50666-0014
PO BOX 15, PLAINFIELD, IA 50666-0015
PO BOX 16, PLAINFIELD, IA 50666-0016
PO BOX 17, PLAINFIELD, IA 50666-0017
PO BOX 18, PLAINFIELD, IA 50666-0018
PO BOX 19, PLAINFIELD, IA 50666-0019
PO BOX 20, PLAINFIELD, IA 50666-0020
PO BOX 21, PLAINFIELD, IA 50666-0021
PO BOX 22, PLAINFIELD, IA 50666-0022
PO BOX 23, PLAINFIELD, IA 50666-0023
PO BOX 24, PLAINFIELD, IA 50666-0024
PO BOX 25, PLAINFIELD, IA 50666-0025
PO BOX 26, PLAINFIELD, IA 50666-0026
PO BOX 27, PLAINFIELD, IA 50666-0027
PO BOX 28, PLAINFIELD, IA 50666-0028
PO BOX 29, PLAINFIELD, IA 50666-0029
PO BOX 30, PLAINFIELD, IA 50666-0030
PO BOX 31, PLAINFIELD, IA 50666-0031
PO BOX 32, PLAINFIELD, IA 50666-0032
PO BOX 33, PLAINFIELD, IA 50666-0033
PO BOX 34, PLAINFIELD, IA 50666-0034
PO BOX 35, PLAINFIELD, IA 50666-0035
PO BOX 36, PLAINFIELD, IA 50666-0036
PO BOX 37, PLAINFIELD, IA 50666-0037
PO BOX 38, PLAINFIELD, IA 50666-0038
PO BOX 39, PLAINFIELD, IA 50666-0039
PO BOX 40, PLAINFIELD, IA 50666-0040
PO BOX 41, PLAINFIELD, IA 50666-0041
PO BOX 42, PLAINFIELD, IA 50666-0042
PO BOX 43, PLAINFIELD, IA 50666-0043
PO BOX 44, PLAINFIELD, IA 50666-0044
PO BOX 45, PLAINFIELD, IA 50666-0045
PO BOX 46, PLAINFIELD, IA 50666-0046
PO BOX 47, PLAINFIELD, IA 50666-0047
PO BOX 48, PLAINFIELD, IA 50666-0048
PO BOX 49, PLAINFIELD, IA 50666-0049
PO BOX 50, PLAINFIELD, IA 50666-0050
PO BOX 51, PLAINFIELD, IA 50666-0051
PO BOX 52, PLAINFIELD, IA 50666-0052
PO BOX 53, PLAINFIELD, IA 50666-0053
PO BOX 54, PLAINFIELD, IA 50666-0054
PO BOX 55, PLAINFIELD, IA 50666-0055
PO BOX 56, PLAINFIELD, IA 50666-0056
PO BOX 57, PLAINFIELD, IA 50666-0057
PO BOX 58, PLAINFIELD, IA 50666-0058
PO BOX 59, PLAINFIELD, IA 50666-0059
PO BOX 60, PLAINFIELD, IA 50666-0060
PO BOX 61, PLAINFIELD, IA 50666-0061
PO BOX 62, PLAINFIELD, IA 50666-0062
PO BOX 63, PLAINFIELD, IA 50666-0063
PO BOX 64, PLAINFIELD, IA 50666-0064
PO BOX 65, PLAINFIELD, IA 50666-0065
PO BOX 66, PLAINFIELD, IA 50666-0066
PO BOX 67, PLAINFIELD, IA 50666-0067
PO BOX 68, PLAINFIELD, IA 50666-0068
PO BOX 69, PLAINFIELD, IA 50666-0069
PO BOX 70, PLAINFIELD, IA 50666-0070
PO BOX 71, PLAINFIELD, IA 50666-0071
PO BOX 72, PLAINFIELD, IA 50666-0072
PO BOX 73, PLAINFIELD, IA 50666-0073
PO BOX 74, PLAINFIELD, IA 50666-0074
PO BOX 75, PLAINFIELD, IA 50666-0075
PO BOX 76, PLAINFIELD, IA 50666-0076
PO BOX 77, PLAINFIELD, IA 50666-0077
PO BOX 78, PLAINFIELD, IA 50666-0078
PO BOX 79, PLAINFIELD, IA 50666-0079
PO BOX 80, PLAINFIELD, IA 50666-0080
PO BOX 81, PLAINFIELD, IA 50666-0081
PO BOX 82, PLAINFIELD, IA 50666-0082
PO BOX 83, PLAINFIELD, IA 50666-0083
PO BOX 84, PLAINFIELD, IA 50666-0084
PO BOX 85, PLAINFIELD, IA 50666-0085
PO BOX 86, PLAINFIELD, IA 50666-0086
PO BOX 87, PLAINFIELD, IA 50666-0087
PO BOX 88, PLAINFIELD, IA 50666-0088
PO BOX 89, PLAINFIELD, IA 50666-0089
PO BOX 90, PLAINFIELD, IA 50666-0090
PO BOX 91, PLAINFIELD, IA 50666-0091
PO BOX 92, PLAINFIELD, IA 50666-0092
PO BOX 93, PLAINFIELD, IA 50666-0093
PO BOX 94, PLAINFIELD, IA 50666-0094
PO BOX 95, PLAINFIELD, IA 50666-0095
PO BOX 96, PLAINFIELD, IA 50666-0096
PO BOX 97, PLAINFIELD, IA 50666-0097
PO BOX 98, PLAINFIELD, IA 50666-0098
PO BOX 99, PLAINFIELD, IA 50666-0099
PO BOX 100, PLAINFIELD, IA 50666-0100
PO BOX 101, PLAINFIELD, IA 50666-0101
PO BOX 102, PLAINFIELD, IA 50666-0102
PO BOX 103, PLAINFIELD, IA 50666-0103
PO BOX 104, PLAINFIELD, IA 50666-0104
PO BOX 105, PLAINFIELD, IA 50666-0105
PO BOX 106, PLAINFIELD, IA 50666-0106
PO BOX 107, PLAINFIELD, IA 50666-0107
PO BOX 108, PLAINFIELD, IA 50666-0108
PO BOX 109, PLAINFIELD, IA 50666-0109
PO BOX 110, PLAINFIELD, IA 50666-0110
PO BOX 111, PLAINFIELD, IA 50666-0111
PO BOX 112, PLAINFIELD, IA 50666-0112
PO BOX 113, PLAINFIELD, IA 50666-0113
PO BOX 114, PLAINFIELD, IA 50666-0114
PO BOX 115, PLAINFIELD, IA 50666-0115
PO BOX 116, PLAINFIELD, IA 50666-0116
PO BOX 117, PLAINFIELD, IA 50666-0117
PO BOX 118, PLAINFIELD, IA 50666-0118
PO BOX 119, PLAINFIELD, IA 50666-0119
PO BOX 120, PLAINFIELD, IA 50666-0120
PO BOX 121, PLAINFIELD, IA 50666-0121
PO BOX 122, PLAINFIELD, IA 50666-0122
PO BOX 123, PLAINFIELD, IA 50666-0123
PO BOX 124, PLAINFIELD, IA 50666-0124
PO BOX 125, PLAINFIELD, IA 50666-0125
PO BOX 126, PLAINFIELD, IA 50666-0126
PO BOX 127, PLAINFIELD, IA 50666-0127
PO BOX 128, PLAINFIELD, IA 50666-0128
PO BOX 129, PLAINFIELD, IA 50666-0129
PO BOX 130, PLAINFIELD, IA 50666-0130
PO BOX 131, PLAINFIELD, IA 50666-0131
PO BOX 132, PLAINFIELD, IA 50666-0132
PO BOX 133, PLAINFIELD, IA 50666-0133
PO BOX 134, PLAINFIELD, IA 50666-0134
PO BOX 135, PLAINFIELD, IA 50666-0135
PO BOX 136, PLAINFIELD, IA 50666-0136
PO BOX 137, PLAINFIELD, IA 50666-0137
PO BOX 138, PLAINFIELD, IA 50666-0138
PO BOX 139, PLAINFIELD, IA 50666-0139
PO BOX 140, PLAINFIELD, IA 50666-0140
PO BOX 141, PLAINFIELD, IA 50666-0141
PO BOX 142, PLAINFIELD, IA 50666-0142
PO BOX 143, PLAINFIELD, IA 50666-0143
PO BOX 144, PLAINFIELD, IA 50666-0144
PO BOX 145, PLAINFIELD, IA 50666-0145
PO BOX 146, PLAINFIELD, IA 50666-0146
PO BOX 147, PLAINFIELD, IA 50666-0147
PO BOX 148, PLAINFIELD, IA 50666-0148
PO BOX 149, PLAINFIELD, IA 50666-0149
PO BOX 150, PLAINFIELD, IA 50666-0150
PO BOX 151, PLAINFIELD, IA 50666-0151
PO BOX 152, PLAINFIELD, IA 50666-0152
PO BOX 153, PLAINFIELD, IA 50666-0153
PO BOX 154, PLAINFIELD, IA 50666-0154
PO BOX 155, PLAINFIELD, IA 50666-0155
PO BOX 156, PLAINFIELD, IA 50666-0156
PO BOX 157, PLAINFIELD, IA 50666-0157
PO BOX 158, PLAINFIELD, IA 50666-0158
PO BOX 159, PLAINFIELD, IA 50666-0159
PO BOX 160, PLAINFIELD, IA 50666-0160
PO BOX 161, PLAINFIELD, IA 50666-0161
PO BOX 162, PLAINFIELD, IA 50666-0162
PO BOX 163, PLAINFIELD, IA 50666-0163
PO BOX 164, PLAINFIELD, IA 50666-0164
PO BOX 165, PLAINFIELD, IA 50666-0165
PO BOX 166, PLAINFIELD, IA 50666-0166
PO BOX 167, PLAINFIELD, IA 50666-0167
PO BOX 168, PLAINFIELD, IA 50666-0168
PO BOX 169, PLAINFIELD, IA 50666-0169
PO BOX 170, PLAINFIELD, IA 50666-0170
PO BOX 171, PLAINFIELD, IA 50666-0171
PO BOX 172, PLAINFIELD, IA 50666-0172
PO BOX 173, PLAINFIELD, IA 50666-0173
PO BOX 174, PLAINFIELD, IA 50666-0174
PO BOX 175, PLAINFIELD, IA 50666-0175
PO BOX 176, PLAINFIELD, IA 50666-0176
PO BOX 177, PLAINFIELD, IA 50666-0177
PO BOX 178, PLAINFIELD, IA 50666-0178
PO BOX 179, PLAINFIELD, IA 50666-0179
PO BOX 180, PLAINFIELD, IA 50666-0180
PO BOX 181, PLAINFIELD, IA 50666-0181
PO BOX 182, PLAINFIELD, IA 50666-0182
PO BOX 183, PLAINFIELD, IA 50666-0183
PO BOX 184, PLAINFIELD, IA 50666-0184
PO BOX 185, PLAINFIELD, IA 50666-0185
PO BOX 186, PLAINFIELD, IA 50666-0186
PO BOX 187, PLAINFIELD, IA 50666-0187
PO BOX 188, PLAINFIELD, IA 50666-0188
PO BOX 189, PLAINFIELD, IA 50666-0189
PO BOX 190, PLAINFIELD, IA 50666-0190
PO BOX 191, PLAINFIELD, IA 50666-0191
PO BOX 192, PLAINFIELD, IA 50666-0192
PO BOX 193, PLAINFIELD, IA 50666-0193
PO BOX 194, PLAINFIELD, IA 50666-0194
PO BOX 195, PLAINFIELD, IA 50666-0195
PO BOX 196, PLAINFIELD, IA 50666-0196
PO BOX 197, PLAINFIELD, IA 50666-0197
PO BOX 198, PLAINFIELD, IA 50666-0198
PO BOX 199, PLAINFIELD, IA 50666-0199
PO BOX 200, PLAINFIELD, IA 50666-0200
PO BOX 201, PLAINFIELD, IA 50666-0201
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