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, GARDEN GROVE, IA 50103-0001
PO BOX 2, GARDEN GROVE, IA 50103-0002
PO BOX 3, GARDEN GROVE, IA 50103-0003
PO BOX 4, GARDEN GROVE, IA 50103-0004
PO BOX 5, GARDEN GROVE, IA 50103-0005
PO BOX 6, GARDEN GROVE, IA 50103-0006
PO BOX 7, GARDEN GROVE, IA 50103-0007
PO BOX 8, GARDEN GROVE, IA 50103-0008
PO BOX 9, GARDEN GROVE, IA 50103-0009
PO BOX 10, GARDEN GROVE, IA 50103-0010
PO BOX 11, GARDEN GROVE, IA 50103-0011
PO BOX 12, GARDEN GROVE, IA 50103-0012
PO BOX 13, GARDEN GROVE, IA 50103-0013
PO BOX 14, GARDEN GROVE, IA 50103-0014
PO BOX 15, GARDEN GROVE, IA 50103-0015
PO BOX 16, GARDEN GROVE, IA 50103-0016
PO BOX 17, GARDEN GROVE, IA 50103-0017
PO BOX 18, GARDEN GROVE, IA 50103-0018
PO BOX 19, GARDEN GROVE, IA 50103-0019
PO BOX 20, GARDEN GROVE, IA 50103-0020
PO BOX 21, GARDEN GROVE, IA 50103-0021
PO BOX 22, GARDEN GROVE, IA 50103-0022
PO BOX 23, GARDEN GROVE, IA 50103-0023
PO BOX 24, GARDEN GROVE, IA 50103-0024
PO BOX 25, GARDEN GROVE, IA 50103-0025
PO BOX 26, GARDEN GROVE, IA 50103-0026
PO BOX 27, GARDEN GROVE, IA 50103-0027
PO BOX 28, GARDEN GROVE, IA 50103-0028
PO BOX 29, GARDEN GROVE, IA 50103-0029
PO BOX 30, GARDEN GROVE, IA 50103-0030
PO BOX 31, GARDEN GROVE, IA 50103-0031
PO BOX 32, GARDEN GROVE, IA 50103-0032
PO BOX 33, GARDEN GROVE, IA 50103-0033
PO BOX 34, GARDEN GROVE, IA 50103-0034
PO BOX 35, GARDEN GROVE, IA 50103-0035
PO BOX 36, GARDEN GROVE, IA 50103-0036
PO BOX 37, GARDEN GROVE, IA 50103-0037
PO BOX 38, GARDEN GROVE, IA 50103-0038
PO BOX 39, GARDEN GROVE, IA 50103-0039
PO BOX 40, GARDEN GROVE, IA 50103-0040
PO BOX 41, GARDEN GROVE, IA 50103-0041
PO BOX 42, GARDEN GROVE, IA 50103-0042
PO BOX 43, GARDEN GROVE, IA 50103-0043
PO BOX 44, GARDEN GROVE, IA 50103-0044
PO BOX 45, GARDEN GROVE, IA 50103-0045
PO BOX 46, GARDEN GROVE, IA 50103-0046
PO BOX 47, GARDEN GROVE, IA 50103-0047
PO BOX 48, GARDEN GROVE, IA 50103-0048
PO BOX 49, GARDEN GROVE, IA 50103-0049
PO BOX 50, GARDEN GROVE, IA 50103-0050
PO BOX 51, GARDEN GROVE, IA 50103-0051
PO BOX 52, GARDEN GROVE, IA 50103-0052
PO BOX 53, GARDEN GROVE, IA 50103-0053
PO BOX 54, GARDEN GROVE, IA 50103-0054
PO BOX 55, GARDEN GROVE, IA 50103-0055
PO BOX 56, GARDEN GROVE, IA 50103-0056
PO BOX 57, GARDEN GROVE, IA 50103-0057
PO BOX 58, GARDEN GROVE, IA 50103-0058
PO BOX 59, GARDEN GROVE, IA 50103-0059
PO BOX 60, GARDEN GROVE, IA 50103-0060
PO BOX 61, GARDEN GROVE, IA 50103-0061
PO BOX 62, GARDEN GROVE, IA 50103-0062
PO BOX 63, GARDEN GROVE, IA 50103-0063
PO BOX 64, GARDEN GROVE, IA 50103-0064
PO BOX 65, GARDEN GROVE, IA 50103-0065
PO BOX 66, GARDEN GROVE, IA 50103-0066
PO BOX 67, GARDEN GROVE, IA 50103-0067
PO BOX 68, GARDEN GROVE, IA 50103-0068
PO BOX 69, GARDEN GROVE, IA 50103-0069
PO BOX 70, GARDEN GROVE, IA 50103-0070
PO BOX 71, GARDEN GROVE, IA 50103-0071
PO BOX 72, GARDEN GROVE, IA 50103-0072
PO BOX 73, GARDEN GROVE, IA 50103-0073
PO BOX 74, GARDEN GROVE, IA 50103-0074
PO BOX 75, GARDEN GROVE, IA 50103-0075
PO BOX 76, GARDEN GROVE, IA 50103-0076
PO BOX 77, GARDEN GROVE, IA 50103-0077
PO BOX 78, GARDEN GROVE, IA 50103-0078
PO BOX 79, GARDEN GROVE, IA 50103-0079
PO BOX 80, GARDEN GROVE, IA 50103-0080
PO BOX 81, GARDEN GROVE, IA 50103-0081
PO BOX 82, GARDEN GROVE, IA 50103-0082
PO BOX 83, GARDEN GROVE, IA 50103-0083
PO BOX 84, GARDEN GROVE, IA 50103-0084
PO BOX 85, GARDEN GROVE, IA 50103-0085
PO BOX 86, GARDEN GROVE, IA 50103-0086
PO BOX 87, GARDEN GROVE, IA 50103-0087
PO BOX 88, GARDEN GROVE, IA 50103-0088
PO BOX 89, GARDEN GROVE, IA 50103-0089
PO BOX 90, GARDEN GROVE, IA 50103-0090
PO BOX 91, GARDEN GROVE, IA 50103-0091
PO BOX 92, GARDEN GROVE, IA 50103-0092
PO BOX 93, GARDEN GROVE, IA 50103-0093
PO BOX 94, GARDEN GROVE, IA 50103-0094
PO BOX 95, GARDEN GROVE, IA 50103-0095
PO BOX 96, GARDEN GROVE, IA 50103-0096
PO BOX 97, GARDEN GROVE, IA 50103-0097
PO BOX 98, GARDEN GROVE, IA 50103-0098
PO BOX 99, GARDEN GROVE, IA 50103-0099
PO BOX 100, GARDEN GROVE, IA 50103-0100
PO BOX 101, GARDEN GROVE, IA 50103-0101
PO BOX 102, GARDEN GROVE, IA 50103-0102
PO BOX 103, GARDEN GROVE, IA 50103-0103
PO BOX 104, GARDEN GROVE, IA 50103-0104
PO BOX 105, GARDEN GROVE, IA 50103-0105
PO BOX 106, GARDEN GROVE, IA 50103-0106
PO BOX 107, GARDEN GROVE, IA 50103-0107
PO BOX 108, GARDEN GROVE, IA 50103-0108
PO BOX 109, GARDEN GROVE, IA 50103-0109
PO BOX 110, GARDEN GROVE, IA 50103-0110
PO BOX 111, GARDEN GROVE, IA 50103-0111
PO BOX 112, GARDEN GROVE, IA 50103-0112
PO BOX 113, GARDEN GROVE, IA 50103-0113
PO BOX 114, GARDEN GROVE, IA 50103-0114
PO BOX 115, GARDEN GROVE, IA 50103-0115
PO BOX 116, GARDEN GROVE, IA 50103-0116
PO BOX 117, GARDEN GROVE, IA 50103-0117
PO BOX 118, GARDEN GROVE, IA 50103-0118
PO BOX 119, GARDEN GROVE, IA 50103-0119
PO BOX 120, GARDEN GROVE, IA 50103-0120
PO BOX 121, GARDEN GROVE, IA 50103-0121
PO BOX 122, GARDEN GROVE, IA 50103-0122
PO BOX 123, GARDEN GROVE, IA 50103-0123
PO BOX 124, GARDEN GROVE, IA 50103-0124
PO BOX 125, GARDEN GROVE, IA 50103-0125
PO BOX 126, GARDEN GROVE, IA 50103-0126
PO BOX 127, GARDEN GROVE, IA 50103-0127
PO BOX 128, GARDEN GROVE, IA 50103-0128
PO BOX 129, GARDEN GROVE, IA 50103-0129
PO BOX 130, GARDEN GROVE, IA 50103-0130
PO BOX 131, GARDEN GROVE, IA 50103-0131
PO BOX 132, GARDEN GROVE, IA 50103-0132
PO BOX 133, GARDEN GROVE, IA 50103-0133
PO BOX 134, GARDEN GROVE, IA 50103-0134
PO BOX 135, GARDEN GROVE, IA 50103-0135
PO BOX 136, GARDEN GROVE, IA 50103-0136
PO BOX 137, GARDEN GROVE, IA 50103-0137
PO BOX 138, GARDEN GROVE, IA 50103-0138
PO BOX 139, GARDEN GROVE, IA 50103-0139
PO BOX 140, GARDEN GROVE, IA 50103-0140
PO BOX 141, GARDEN GROVE, IA 50103-0141
PO BOX 142, GARDEN GROVE, IA 50103-0142
PO BOX 143, GARDEN GROVE, IA 50103-0143
PO BOX 144, GARDEN GROVE, IA 50103-0144
PO BOX 145, GARDEN GROVE, IA 50103-0145
PO BOX 146, GARDEN GROVE, IA 50103-0146
PO BOX 147, GARDEN GROVE, IA 50103-0147
PO BOX 148, GARDEN GROVE, IA 50103-0148
PO BOX 149, GARDEN GROVE, IA 50103-0149
PO BOX 150, GARDEN GROVE, IA 50103-0150
PO BOX 151, GARDEN GROVE, IA 50103-0151
PO BOX 152, GARDEN GROVE, IA 50103-0152
PO BOX 153, GARDEN GROVE, IA 50103-0153
PO BOX 154, GARDEN GROVE, IA 50103-0154
PO BOX 155, GARDEN GROVE, IA 50103-0155
PO BOX 156, GARDEN GROVE, IA 50103-0156
PO BOX 157, GARDEN GROVE, IA 50103-0157
PO BOX 158, GARDEN GROVE, IA 50103-0158
PO BOX 159, GARDEN GROVE, IA 50103-0159
PO BOX 160, GARDEN GROVE, IA 50103-0160
PO BOX 161, GARDEN GROVE, IA 50103-0161
PO BOX 162, GARDEN GROVE, IA 50103-0162
PO BOX 163, GARDEN GROVE, IA 50103-0163
PO BOX 164, GARDEN GROVE, IA 50103-0164
PO BOX 165, GARDEN GROVE, IA 50103-0165
PO BOX 166, GARDEN GROVE, IA 50103-0166
PO BOX 167, GARDEN GROVE, IA 50103-0167
PO BOX 168, GARDEN GROVE, IA 50103-0168
PO BOX 169, GARDEN GROVE, IA 50103-0169
PO BOX 170, GARDEN GROVE, IA 50103-0170
PO BOX 171, GARDEN GROVE, IA 50103-0171
PO BOX 172, GARDEN GROVE, IA 50103-0172
PO BOX 173, GARDEN GROVE, IA 50103-0173
PO BOX 174, GARDEN GROVE, IA 50103-0174
PO BOX 175, GARDEN GROVE, IA 50103-0175
PO BOX 176, GARDEN GROVE, IA 50103-0176
PO BOX 177, GARDEN GROVE, IA 50103-0177
PO BOX 178, GARDEN GROVE, IA 50103-0178
PO BOX 179, GARDEN GROVE, IA 50103-0179
PO BOX 180, GARDEN GROVE, IA 50103-0180
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