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, WINFIELD, IA 52659-0001
PO BOX 2, WINFIELD, IA 52659-0002
PO BOX 3, WINFIELD, IA 52659-0003
PO BOX 4, WINFIELD, IA 52659-0004
PO BOX 5, WINFIELD, IA 52659-0005
PO BOX 6, WINFIELD, IA 52659-0006
PO BOX 7, WINFIELD, IA 52659-0007
PO BOX 8, WINFIELD, IA 52659-0008
PO BOX 9, WINFIELD, IA 52659-0009
PO BOX 10, WINFIELD, IA 52659-0010
PO BOX 11, WINFIELD, IA 52659-0011
PO BOX 12, WINFIELD, IA 52659-0012
PO BOX 13, WINFIELD, IA 52659-0013
PO BOX 14, WINFIELD, IA 52659-0014
PO BOX 15, WINFIELD, IA 52659-0015
PO BOX 16, WINFIELD, IA 52659-0016
PO BOX 17, WINFIELD, IA 52659-0017
PO BOX 18, WINFIELD, IA 52659-0018
PO BOX 19, WINFIELD, IA 52659-0019
PO BOX 20, WINFIELD, IA 52659-0020
PO BOX 21, WINFIELD, IA 52659-0021
PO BOX 22, WINFIELD, IA 52659-0022
PO BOX 23, WINFIELD, IA 52659-0023
PO BOX 24, WINFIELD, IA 52659-0024
PO BOX 25, WINFIELD, IA 52659-0025
PO BOX 26, WINFIELD, IA 52659-0026
PO BOX 27, WINFIELD, IA 52659-0027
PO BOX 28, WINFIELD, IA 52659-0028
PO BOX 29, WINFIELD, IA 52659-0029
PO BOX 30, WINFIELD, IA 52659-0030
PO BOX 31, WINFIELD, IA 52659-0031
PO BOX 32, WINFIELD, IA 52659-0032
PO BOX 33, WINFIELD, IA 52659-0033
PO BOX 34, WINFIELD, IA 52659-0034
PO BOX 35, WINFIELD, IA 52659-0035
PO BOX 36, WINFIELD, IA 52659-0036
PO BOX 37, WINFIELD, IA 52659-0037
PO BOX 38, WINFIELD, IA 52659-0038
PO BOX 39, WINFIELD, IA 52659-0039
PO BOX 40, WINFIELD, IA 52659-0040
PO BOX 41, WINFIELD, IA 52659-0041
PO BOX 42, WINFIELD, IA 52659-0042
PO BOX 43, WINFIELD, IA 52659-0043
PO BOX 44, WINFIELD, IA 52659-0044
PO BOX 45, WINFIELD, IA 52659-0045
PO BOX 46, WINFIELD, IA 52659-0046
PO BOX 47, WINFIELD, IA 52659-0047
PO BOX 48, WINFIELD, IA 52659-0048
PO BOX 49, WINFIELD, IA 52659-0049
PO BOX 50, WINFIELD, IA 52659-0050
PO BOX 51, WINFIELD, IA 52659-0051
PO BOX 52, WINFIELD, IA 52659-0052
PO BOX 53, WINFIELD, IA 52659-0053
PO BOX 54, WINFIELD, IA 52659-0054
PO BOX 55, WINFIELD, IA 52659-0055
PO BOX 56, WINFIELD, IA 52659-0056
PO BOX 57, WINFIELD, IA 52659-0057
PO BOX 58, WINFIELD, IA 52659-0058
PO BOX 59, WINFIELD, IA 52659-0059
PO BOX 60, WINFIELD, IA 52659-0060
PO BOX 61, WINFIELD, IA 52659-0061
PO BOX 62, WINFIELD, IA 52659-0062
PO BOX 63, WINFIELD, IA 52659-0063
PO BOX 64, WINFIELD, IA 52659-0064
PO BOX 65, WINFIELD, IA 52659-0065
PO BOX 66, WINFIELD, IA 52659-0066
PO BOX 67, WINFIELD, IA 52659-0067
PO BOX 68, WINFIELD, IA 52659-0068
PO BOX 69, WINFIELD, IA 52659-0069
PO BOX 70, WINFIELD, IA 52659-0070
PO BOX 71, WINFIELD, IA 52659-0071
PO BOX 72, WINFIELD, IA 52659-0072
PO BOX 73, WINFIELD, IA 52659-0073
PO BOX 74, WINFIELD, IA 52659-0074
PO BOX 75, WINFIELD, IA 52659-0075
PO BOX 76, WINFIELD, IA 52659-0076
PO BOX 77, WINFIELD, IA 52659-0077
PO BOX 78, WINFIELD, IA 52659-0078
PO BOX 79, WINFIELD, IA 52659-0079
PO BOX 80, WINFIELD, IA 52659-0080
PO BOX 81, WINFIELD, IA 52659-0081
PO BOX 82, WINFIELD, IA 52659-0082
PO BOX 83, WINFIELD, IA 52659-0083
PO BOX 84, WINFIELD, IA 52659-0084
PO BOX 85, WINFIELD, IA 52659-0085
PO BOX 86, WINFIELD, IA 52659-0086
PO BOX 87, WINFIELD, IA 52659-0087
PO BOX 88, WINFIELD, IA 52659-0088
PO BOX 89, WINFIELD, IA 52659-0089
PO BOX 90, WINFIELD, IA 52659-0090
PO BOX 91, WINFIELD, IA 52659-0091
PO BOX 92, WINFIELD, IA 52659-0092
PO BOX 93, WINFIELD, IA 52659-0093
PO BOX 94, WINFIELD, IA 52659-0094
PO BOX 95, WINFIELD, IA 52659-0095
PO BOX 96, WINFIELD, IA 52659-0096
PO BOX 97, WINFIELD, IA 52659-0097
PO BOX 98, WINFIELD, IA 52659-0098
PO BOX 99, WINFIELD, IA 52659-0099
PO BOX 100, WINFIELD, IA 52659-0100
PO BOX 101, WINFIELD, IA 52659-0101
PO BOX 102, WINFIELD, IA 52659-0102
PO BOX 103, WINFIELD, IA 52659-0103
PO BOX 104, WINFIELD, IA 52659-0104
PO BOX 105, WINFIELD, IA 52659-0105
PO BOX 106, WINFIELD, IA 52659-0106
PO BOX 107, WINFIELD, IA 52659-0107
PO BOX 108, WINFIELD, IA 52659-0108
PO BOX 109, WINFIELD, IA 52659-0109
PO BOX 110, WINFIELD, IA 52659-0110
PO BOX 111, WINFIELD, IA 52659-0111
PO BOX 112, WINFIELD, IA 52659-0112
PO BOX 113, WINFIELD, IA 52659-0113
PO BOX 114, WINFIELD, IA 52659-0114
PO BOX 115, WINFIELD, IA 52659-0115
PO BOX 116, WINFIELD, IA 52659-0116
PO BOX 117, WINFIELD, IA 52659-0117
PO BOX 118, WINFIELD, IA 52659-0118
PO BOX 119, WINFIELD, IA 52659-0119
PO BOX 120, WINFIELD, IA 52659-0120
PO BOX 121, WINFIELD, IA 52659-0121
PO BOX 122, WINFIELD, IA 52659-0122
PO BOX 123, WINFIELD, IA 52659-0123
PO BOX 124, WINFIELD, IA 52659-0124
PO BOX 125, WINFIELD, IA 52659-0125
PO BOX 126, WINFIELD, IA 52659-0126
PO BOX 127, WINFIELD, IA 52659-0127
PO BOX 128, WINFIELD, IA 52659-0128
PO BOX 129, WINFIELD, IA 52659-0129
PO BOX 130, WINFIELD, IA 52659-0130
PO BOX 131, WINFIELD, IA 52659-0131
PO BOX 132, WINFIELD, IA 52659-0132
PO BOX 133, WINFIELD, IA 52659-0133
PO BOX 134, WINFIELD, IA 52659-0134
PO BOX 135, WINFIELD, IA 52659-0135
PO BOX 136, WINFIELD, IA 52659-0136
PO BOX 137, WINFIELD, IA 52659-0137
PO BOX 138, WINFIELD, IA 52659-0138
PO BOX 139, WINFIELD, IA 52659-0139
PO BOX 140, WINFIELD, IA 52659-0140
PO BOX 141, WINFIELD, IA 52659-0141
PO BOX 142, WINFIELD, IA 52659-0142
PO BOX 143, WINFIELD, IA 52659-0143
PO BOX 144, WINFIELD, IA 52659-0144
PO BOX 145, WINFIELD, IA 52659-0145
PO BOX 146, WINFIELD, IA 52659-0146
PO BOX 147, WINFIELD, IA 52659-0147
PO BOX 148, WINFIELD, IA 52659-0148
PO BOX 149, WINFIELD, IA 52659-0149
PO BOX 150, WINFIELD, IA 52659-0150
PO BOX 151, WINFIELD, IA 52659-0151
PO BOX 152, WINFIELD, IA 52659-0152
PO BOX 153, WINFIELD, IA 52659-0153
PO BOX 154, WINFIELD, IA 52659-0154
PO BOX 155, WINFIELD, IA 52659-0155
PO BOX 156, WINFIELD, IA 52659-0156
PO BOX 157, WINFIELD, IA 52659-0157
PO BOX 158, WINFIELD, IA 52659-0158
PO BOX 159, WINFIELD, IA 52659-0159
PO BOX 160, WINFIELD, IA 52659-0160
PO BOX 161, WINFIELD, IA 52659-0161
PO BOX 162, WINFIELD, IA 52659-0162
PO BOX 163, WINFIELD, IA 52659-0163
PO BOX 164, WINFIELD, IA 52659-0164
PO BOX 165, WINFIELD, IA 52659-0165
PO BOX 166, WINFIELD, IA 52659-0166
PO BOX 167, WINFIELD, IA 52659-0167
PO BOX 168, WINFIELD, IA 52659-0168
PO BOX 169, WINFIELD, IA 52659-0169
PO BOX 170, WINFIELD, IA 52659-0170
PO BOX 171, WINFIELD, IA 52659-0171
PO BOX 172, WINFIELD, IA 52659-0172
PO BOX 173, WINFIELD, IA 52659-0173
PO BOX 174, WINFIELD, IA 52659-0174
PO BOX 175, WINFIELD, IA 52659-0175
PO BOX 176, WINFIELD, IA 52659-0176
PO BOX 177, WINFIELD, IA 52659-0177
PO BOX 178, WINFIELD, IA 52659-0178
PO BOX 179, WINFIELD, IA 52659-0179
PO BOX 180, WINFIELD, IA 52659-0180
PO BOX 181, WINFIELD, IA 52659-0181
PO BOX 182, WINFIELD, IA 52659-0182
PO BOX 183, WINFIELD, IA 52659-0183
PO BOX 184, WINFIELD, IA 52659-0184
PO BOX 185, WINFIELD, IA 52659-0185
PO BOX 186, WINFIELD, IA 52659-0186
PO BOX 187, WINFIELD, IA 52659-0187
PO BOX 188, WINFIELD, IA 52659-0188
PO BOX 189, WINFIELD, IA 52659-0189
PO BOX 190, WINFIELD, IA 52659-0190
PO BOX 191, WINFIELD, IA 52659-0191
PO BOX 192, WINFIELD, IA 52659-0192
PO BOX 193, WINFIELD, IA 52659-0193
PO BOX 194, WINFIELD, IA 52659-0194
PO BOX 195, WINFIELD, IA 52659-0195
PO BOX 196, WINFIELD, IA 52659-0196
PO BOX 197, WINFIELD, IA 52659-0197
PO BOX 198, WINFIELD, IA 52659-0198
PO BOX 199, WINFIELD, IA 52659-0199
PO BOX 200, WINFIELD, IA 52659-0200
PO BOX 201, WINFIELD, IA 52659-0201
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