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, GARWIN, IA 50632-0001
PO BOX 2, GARWIN, IA 50632-0002
PO BOX 3, GARWIN, IA 50632-0003
PO BOX 4, GARWIN, IA 50632-0004
PO BOX 5, GARWIN, IA 50632-0005
PO BOX 6, GARWIN, IA 50632-0006
PO BOX 7, GARWIN, IA 50632-0007
PO BOX 8, GARWIN, IA 50632-0008
PO BOX 9, GARWIN, IA 50632-0009
PO BOX 10, GARWIN, IA 50632-0010
PO BOX 11, GARWIN, IA 50632-0011
PO BOX 12, GARWIN, IA 50632-0012
PO BOX 13, GARWIN, IA 50632-0013
PO BOX 14, GARWIN, IA 50632-0014
PO BOX 15, GARWIN, IA 50632-0015
PO BOX 16, GARWIN, IA 50632-0016
PO BOX 17, GARWIN, IA 50632-0017
PO BOX 18, GARWIN, IA 50632-0018
PO BOX 19, GARWIN, IA 50632-0019
PO BOX 20, GARWIN, IA 50632-0020
PO BOX 21, GARWIN, IA 50632-0021
PO BOX 22, GARWIN, IA 50632-0022
PO BOX 23, GARWIN, IA 50632-0023
PO BOX 24, GARWIN, IA 50632-0024
PO BOX 25, GARWIN, IA 50632-0025
PO BOX 26, GARWIN, IA 50632-0026
PO BOX 27, GARWIN, IA 50632-0027
PO BOX 28, GARWIN, IA 50632-0028
PO BOX 29, GARWIN, IA 50632-0029
PO BOX 30, GARWIN, IA 50632-0030
PO BOX 31, GARWIN, IA 50632-0031
PO BOX 32, GARWIN, IA 50632-0032
PO BOX 33, GARWIN, IA 50632-0033
PO BOX 34, GARWIN, IA 50632-0034
PO BOX 35, GARWIN, IA 50632-0035
PO BOX 36, GARWIN, IA 50632-0036
PO BOX 37, GARWIN, IA 50632-0037
PO BOX 38, GARWIN, IA 50632-0038
PO BOX 39, GARWIN, IA 50632-0039
PO BOX 40, GARWIN, IA 50632-0040
PO BOX 41, GARWIN, IA 50632-0041
PO BOX 42, GARWIN, IA 50632-0042
PO BOX 43, GARWIN, IA 50632-0043
PO BOX 44, GARWIN, IA 50632-0044
PO BOX 45, GARWIN, IA 50632-0045
PO BOX 46, GARWIN, IA 50632-0046
PO BOX 47, GARWIN, IA 50632-0047
PO BOX 48, GARWIN, IA 50632-0048
PO BOX 49, GARWIN, IA 50632-0049
PO BOX 50, GARWIN, IA 50632-0050
PO BOX 51, GARWIN, IA 50632-0051
PO BOX 52, GARWIN, IA 50632-0052
PO BOX 53, GARWIN, IA 50632-0053
PO BOX 54, GARWIN, IA 50632-0054
PO BOX 55, GARWIN, IA 50632-0055
PO BOX 56, GARWIN, IA 50632-0056
PO BOX 57, GARWIN, IA 50632-0057
PO BOX 58, GARWIN, IA 50632-0058
PO BOX 59, GARWIN, IA 50632-0059
PO BOX 60, GARWIN, IA 50632-0060
PO BOX 61, GARWIN, IA 50632-0061
PO BOX 62, GARWIN, IA 50632-0062
PO BOX 63, GARWIN, IA 50632-0063
PO BOX 64, GARWIN, IA 50632-0064
PO BOX 65, GARWIN, IA 50632-0065
PO BOX 66, GARWIN, IA 50632-0066
PO BOX 67, GARWIN, IA 50632-0067
PO BOX 68, GARWIN, IA 50632-0068
PO BOX 69, GARWIN, IA 50632-0069
PO BOX 70, GARWIN, IA 50632-0070
PO BOX 71, GARWIN, IA 50632-0071
PO BOX 72, GARWIN, IA 50632-0072
PO BOX 73, GARWIN, IA 50632-0073
PO BOX 74, GARWIN, IA 50632-0074
PO BOX 75, GARWIN, IA 50632-0075
PO BOX 76, GARWIN, IA 50632-0076
PO BOX 77, GARWIN, IA 50632-0077
PO BOX 78, GARWIN, IA 50632-0078
PO BOX 79, GARWIN, IA 50632-0079
PO BOX 80, GARWIN, IA 50632-0080
PO BOX 81, GARWIN, IA 50632-0081
PO BOX 82, GARWIN, IA 50632-0082
PO BOX 83, GARWIN, IA 50632-0083
PO BOX 84, GARWIN, IA 50632-0084
PO BOX 85, GARWIN, IA 50632-0085
PO BOX 86, GARWIN, IA 50632-0086
PO BOX 87, GARWIN, IA 50632-0087
PO BOX 88, GARWIN, IA 50632-0088
PO BOX 89, GARWIN, IA 50632-0089
PO BOX 90, GARWIN, IA 50632-0090
PO BOX 91, GARWIN, IA 50632-0091
PO BOX 92, GARWIN, IA 50632-0092
PO BOX 93, GARWIN, IA 50632-0093
PO BOX 94, GARWIN, IA 50632-0094
PO BOX 95, GARWIN, IA 50632-0095
PO BOX 96, GARWIN, IA 50632-0096
PO BOX 97, GARWIN, IA 50632-0097
PO BOX 98, GARWIN, IA 50632-0098
PO BOX 99, GARWIN, IA 50632-0099
PO BOX 100, GARWIN, IA 50632-0100
PO BOX 101, GARWIN, IA 50632-0101
PO BOX 102, GARWIN, IA 50632-0102
PO BOX 103, GARWIN, IA 50632-0103
PO BOX 104, GARWIN, IA 50632-0104
PO BOX 105, GARWIN, IA 50632-0105
PO BOX 106, GARWIN, IA 50632-0106
PO BOX 107, GARWIN, IA 50632-0107
PO BOX 108, GARWIN, IA 50632-0108
PO BOX 109, GARWIN, IA 50632-0109
PO BOX 110, GARWIN, IA 50632-0110
PO BOX 111, GARWIN, IA 50632-0111
PO BOX 112, GARWIN, IA 50632-0112
PO BOX 113, GARWIN, IA 50632-0113
PO BOX 114, GARWIN, IA 50632-0114
PO BOX 115, GARWIN, IA 50632-0115
PO BOX 116, GARWIN, IA 50632-0116
PO BOX 117, GARWIN, IA 50632-0117
PO BOX 118, GARWIN, IA 50632-0118
PO BOX 119, GARWIN, IA 50632-0119
PO BOX 120, GARWIN, IA 50632-0120
PO BOX 121, GARWIN, IA 50632-0121
PO BOX 122, GARWIN, IA 50632-0122
PO BOX 123, GARWIN, IA 50632-0123
PO BOX 124, GARWIN, IA 50632-0124
PO BOX 125, GARWIN, IA 50632-0125
PO BOX 126, GARWIN, IA 50632-0126
PO BOX 127, GARWIN, IA 50632-0127
PO BOX 128, GARWIN, IA 50632-0128
PO BOX 129, GARWIN, IA 50632-0129
PO BOX 130, GARWIN, IA 50632-0130
PO BOX 131, GARWIN, IA 50632-0131
PO BOX 132, GARWIN, IA 50632-0132
PO BOX 133, GARWIN, IA 50632-0133
PO BOX 134, GARWIN, IA 50632-0134
PO BOX 135, GARWIN, IA 50632-0135
PO BOX 136, GARWIN, IA 50632-0136
PO BOX 137, GARWIN, IA 50632-0137
PO BOX 138, GARWIN, IA 50632-0138
PO BOX 139, GARWIN, IA 50632-0139
PO BOX 140, GARWIN, IA 50632-0140
PO BOX 141, GARWIN, IA 50632-0141
PO BOX 142, GARWIN, IA 50632-0142
PO BOX 143, GARWIN, IA 50632-0143
PO BOX 144, GARWIN, IA 50632-0144
PO BOX 145, GARWIN, IA 50632-0145
PO BOX 146, GARWIN, IA 50632-0146
PO BOX 147, GARWIN, IA 50632-0147
PO BOX 148, GARWIN, IA 50632-0148
PO BOX 149, GARWIN, IA 50632-0149
PO BOX 150, GARWIN, IA 50632-0150
PO BOX 151, GARWIN, IA 50632-0151
PO BOX 152, GARWIN, IA 50632-0152
PO BOX 153, GARWIN, IA 50632-0153
PO BOX 154, GARWIN, IA 50632-0154
PO BOX 155, GARWIN, IA 50632-0155
PO BOX 156, GARWIN, IA 50632-0156
PO BOX 157, GARWIN, IA 50632-0157
PO BOX 158, GARWIN, IA 50632-0158
PO BOX 159, GARWIN, IA 50632-0159
PO BOX 160, GARWIN, IA 50632-0160
PO BOX 161, GARWIN, IA 50632-0161
PO BOX 162, GARWIN, IA 50632-0162
PO BOX 163, GARWIN, IA 50632-0163
PO BOX 164, GARWIN, IA 50632-0164
PO BOX 165, GARWIN, IA 50632-0165
PO BOX 166, GARWIN, IA 50632-0166
PO BOX 167, GARWIN, IA 50632-0167
PO BOX 168, GARWIN, IA 50632-0168
PO BOX 169, GARWIN, IA 50632-0169
PO BOX 170, GARWIN, IA 50632-0170
PO BOX 171, GARWIN, IA 50632-0171
PO BOX 172, GARWIN, IA 50632-0172
PO BOX 173, GARWIN, IA 50632-0173
PO BOX 174, GARWIN, IA 50632-0174
PO BOX 175, GARWIN, IA 50632-0175
PO BOX 176, GARWIN, IA 50632-0176
PO BOX 177, GARWIN, IA 50632-0177
PO BOX 178, GARWIN, IA 50632-0178
PO BOX 179, GARWIN, IA 50632-0179
PO BOX 180, GARWIN, IA 50632-0180
PO BOX 181, GARWIN, IA 50632-0181
PO BOX 182, GARWIN, IA 50632-0182
PO BOX 183, GARWIN, IA 50632-0183
PO BOX 184, GARWIN, IA 50632-0184
PO BOX 185, GARWIN, IA 50632-0185
PO BOX 186, GARWIN, IA 50632-0186
PO BOX 187, GARWIN, IA 50632-0187
PO BOX 188, GARWIN, IA 50632-0188
PO BOX 189, GARWIN, IA 50632-0189
PO BOX 190, GARWIN, IA 50632-0190
PO BOX 191, GARWIN, IA 50632-0191
PO BOX 192, GARWIN, IA 50632-0192
PO BOX 193, GARWIN, IA 50632-0193
PO BOX 194, GARWIN, IA 50632-0194
PO BOX 195, GARWIN, IA 50632-0195
PO BOX 196, GARWIN, IA 50632-0196
PO BOX 197, GARWIN, IA 50632-0197
PO BOX 198, GARWIN, IA 50632-0198
PO BOX 199, GARWIN, IA 50632-0199
PO BOX 200, GARWIN, IA 50632-0200
PO BOX 201, GARWIN, IA 50632-0201
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