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, SWALEDALE, IA 50477-0001
PO BOX 2, SWALEDALE, IA 50477-0002
PO BOX 3, SWALEDALE, IA 50477-0003
PO BOX 4, SWALEDALE, IA 50477-0004
PO BOX 5, SWALEDALE, IA 50477-0005
PO BOX 6, SWALEDALE, IA 50477-0006
PO BOX 7, SWALEDALE, IA 50477-0007
PO BOX 8, SWALEDALE, IA 50477-0008
PO BOX 9, SWALEDALE, IA 50477-0009
PO BOX 10, SWALEDALE, IA 50477-0010
PO BOX 11, SWALEDALE, IA 50477-0011
PO BOX 12, SWALEDALE, IA 50477-0012
PO BOX 13, SWALEDALE, IA 50477-0013
PO BOX 14, SWALEDALE, IA 50477-0014
PO BOX 15, SWALEDALE, IA 50477-0015
PO BOX 16, SWALEDALE, IA 50477-0016
PO BOX 17, SWALEDALE, IA 50477-0017
PO BOX 18, SWALEDALE, IA 50477-0018
PO BOX 19, SWALEDALE, IA 50477-0019
PO BOX 20, SWALEDALE, IA 50477-0020
PO BOX 21, SWALEDALE, IA 50477-0021
PO BOX 22, SWALEDALE, IA 50477-0022
PO BOX 23, SWALEDALE, IA 50477-0023
PO BOX 24, SWALEDALE, IA 50477-0024
PO BOX 25, SWALEDALE, IA 50477-0025
PO BOX 26, SWALEDALE, IA 50477-0026
PO BOX 27, SWALEDALE, IA 50477-0027
PO BOX 28, SWALEDALE, IA 50477-0028
PO BOX 29, SWALEDALE, IA 50477-0029
PO BOX 30, SWALEDALE, IA 50477-0030
PO BOX 31, SWALEDALE, IA 50477-0031
PO BOX 32, SWALEDALE, IA 50477-0032
PO BOX 33, SWALEDALE, IA 50477-0033
PO BOX 34, SWALEDALE, IA 50477-0034
PO BOX 35, SWALEDALE, IA 50477-0035
PO BOX 36, SWALEDALE, IA 50477-0036
PO BOX 37, SWALEDALE, IA 50477-0037
PO BOX 38, SWALEDALE, IA 50477-0038
PO BOX 39, SWALEDALE, IA 50477-0039
PO BOX 40, SWALEDALE, IA 50477-0040
PO BOX 41, SWALEDALE, IA 50477-0041
PO BOX 42, SWALEDALE, IA 50477-0042
PO BOX 43, SWALEDALE, IA 50477-0043
PO BOX 44, SWALEDALE, IA 50477-0044
PO BOX 45, SWALEDALE, IA 50477-0045
PO BOX 46, SWALEDALE, IA 50477-0046
PO BOX 47, SWALEDALE, IA 50477-0047
PO BOX 48, SWALEDALE, IA 50477-0048
PO BOX 49, SWALEDALE, IA 50477-0049
PO BOX 50, SWALEDALE, IA 50477-0050
PO BOX 51, SWALEDALE, IA 50477-0051
PO BOX 52, SWALEDALE, IA 50477-0052
PO BOX 53, SWALEDALE, IA 50477-0053
PO BOX 54, SWALEDALE, IA 50477-0054
PO BOX 55, SWALEDALE, IA 50477-0055
PO BOX 56, SWALEDALE, IA 50477-0056
PO BOX 57, SWALEDALE, IA 50477-0057
PO BOX 58, SWALEDALE, IA 50477-0058
PO BOX 59, SWALEDALE, IA 50477-0059
PO BOX 60, SWALEDALE, IA 50477-0060
PO BOX 61, SWALEDALE, IA 50477-0061
PO BOX 62, SWALEDALE, IA 50477-0062
PO BOX 63, SWALEDALE, IA 50477-0063
PO BOX 64, SWALEDALE, IA 50477-0064
PO BOX 65, SWALEDALE, IA 50477-0065
PO BOX 66, SWALEDALE, IA 50477-0066
PO BOX 67, SWALEDALE, IA 50477-0067
PO BOX 68, SWALEDALE, IA 50477-0068
PO BOX 69, SWALEDALE, IA 50477-0069
PO BOX 70, SWALEDALE, IA 50477-0070
PO BOX 71, SWALEDALE, IA 50477-0071
PO BOX 72, SWALEDALE, IA 50477-0072
PO BOX 73, SWALEDALE, IA 50477-0073
PO BOX 74, SWALEDALE, IA 50477-0074
PO BOX 75, SWALEDALE, IA 50477-0075
PO BOX 76, SWALEDALE, IA 50477-0076
PO BOX 77, SWALEDALE, IA 50477-0077
PO BOX 78, SWALEDALE, IA 50477-0078
PO BOX 79, SWALEDALE, IA 50477-0079
PO BOX 80, SWALEDALE, IA 50477-0080
PO BOX 81, SWALEDALE, IA 50477-0081
PO BOX 82, SWALEDALE, IA 50477-0082
PO BOX 83, SWALEDALE, IA 50477-0083
PO BOX 84, SWALEDALE, IA 50477-0084
PO BOX 85, SWALEDALE, IA 50477-0085
PO BOX 86, SWALEDALE, IA 50477-0086
PO BOX 87, SWALEDALE, IA 50477-0087
PO BOX 88, SWALEDALE, IA 50477-0088
PO BOX 89, SWALEDALE, IA 50477-0089
PO BOX 90, SWALEDALE, IA 50477-0090
PO BOX 91, SWALEDALE, IA 50477-0091
PO BOX 92, SWALEDALE, IA 50477-0092
PO BOX 93, SWALEDALE, IA 50477-0093
PO BOX 94, SWALEDALE, IA 50477-0094
PO BOX 95, SWALEDALE, IA 50477-0095
PO BOX 96, SWALEDALE, IA 50477-0096
PO BOX 97, SWALEDALE, IA 50477-0097
PO BOX 98, SWALEDALE, IA 50477-0098
PO BOX 99, SWALEDALE, IA 50477-0099
PO BOX 100, SWALEDALE, IA 50477-0100
PO BOX 101, SWALEDALE, IA 50477-0101
PO BOX 102, SWALEDALE, IA 50477-0102
PO BOX 103, SWALEDALE, IA 50477-0103
PO BOX 104, SWALEDALE, IA 50477-0104
PO BOX 105, SWALEDALE, IA 50477-0105
PO BOX 106, SWALEDALE, IA 50477-0106
PO BOX 107, SWALEDALE, IA 50477-0107
PO BOX 108, SWALEDALE, IA 50477-0108
PO BOX 109, SWALEDALE, IA 50477-0109
PO BOX 110, SWALEDALE, IA 50477-0110
PO BOX 111, SWALEDALE, IA 50477-0111
PO BOX 112, SWALEDALE, IA 50477-0112
PO BOX 113, SWALEDALE, IA 50477-0113
PO BOX 114, SWALEDALE, IA 50477-0114
PO BOX 115, SWALEDALE, IA 50477-0115
PO BOX 116, SWALEDALE, IA 50477-0116
PO BOX 117, SWALEDALE, IA 50477-0117
PO BOX 118, SWALEDALE, IA 50477-0118
PO BOX 119, SWALEDALE, IA 50477-0119
PO BOX 120, SWALEDALE, IA 50477-0120
PO BOX 121, SWALEDALE, IA 50477-0121
PO BOX 122, SWALEDALE, IA 50477-0122
PO BOX 123, SWALEDALE, IA 50477-0123
PO BOX 124, SWALEDALE, IA 50477-0124
PO BOX 125, SWALEDALE, IA 50477-0125
PO BOX 126, SWALEDALE, IA 50477-0126
PO BOX 127, SWALEDALE, IA 50477-0127
PO BOX 128, SWALEDALE, IA 50477-0128
PO BOX 129, SWALEDALE, IA 50477-0129
PO BOX 130, SWALEDALE, IA 50477-0130
PO BOX 131, SWALEDALE, IA 50477-0131
PO BOX 132, SWALEDALE, IA 50477-0132
PO BOX 133, SWALEDALE, IA 50477-0133
PO BOX 134, SWALEDALE, IA 50477-0134
PO BOX 135, SWALEDALE, IA 50477-0135
PO BOX 136, SWALEDALE, IA 50477-0136
PO BOX 137, SWALEDALE, IA 50477-0137
PO BOX 138, SWALEDALE, IA 50477-0138
PO BOX 139, SWALEDALE, IA 50477-0139
PO BOX 140, SWALEDALE, IA 50477-0140
PO BOX 141, SWALEDALE, IA 50477-0141
PO BOX 142, SWALEDALE, IA 50477-0142
PO BOX 143, SWALEDALE, IA 50477-0143
PO BOX 144, SWALEDALE, IA 50477-0144
PO BOX 145, SWALEDALE, IA 50477-0145
PO BOX 146, SWALEDALE, IA 50477-0146
PO BOX 147, SWALEDALE, IA 50477-0147
PO BOX 148, SWALEDALE, IA 50477-0148
PO BOX 149, SWALEDALE, IA 50477-0149
PO BOX 150, SWALEDALE, IA 50477-0150
PO BOX 151, SWALEDALE, IA 50477-0151
PO BOX 152, SWALEDALE, IA 50477-0152
PO BOX 153, SWALEDALE, IA 50477-0153
PO BOX 154, SWALEDALE, IA 50477-0154
PO BOX 155, SWALEDALE, IA 50477-0155
PO BOX 156, SWALEDALE, IA 50477-0156
PO BOX 157, SWALEDALE, IA 50477-0157
PO BOX 158, SWALEDALE, IA 50477-0158
PO BOX 159, SWALEDALE, IA 50477-0159
PO BOX 160, SWALEDALE, IA 50477-0160
PO BOX 161, SWALEDALE, IA 50477-0161
PO BOX 162, SWALEDALE, IA 50477-0162
PO BOX 163, SWALEDALE, IA 50477-0163
PO BOX 164, SWALEDALE, IA 50477-0164
PO BOX 165, SWALEDALE, IA 50477-0165
PO BOX 166, SWALEDALE, IA 50477-0166
PO BOX 167, SWALEDALE, IA 50477-0167
PO BOX 168, SWALEDALE, IA 50477-0168
PO BOX 169, SWALEDALE, IA 50477-0169
PO BOX 170, SWALEDALE, IA 50477-0170
PO BOX 171, SWALEDALE, IA 50477-0171
PO BOX 172, SWALEDALE, IA 50477-0172
PO BOX 173, SWALEDALE, IA 50477-0173
PO BOX 174, SWALEDALE, IA 50477-0174
PO BOX 175, SWALEDALE, IA 50477-0175
PO BOX 176, SWALEDALE, IA 50477-0176
PO BOX 177, SWALEDALE, IA 50477-0177
PO BOX 178, SWALEDALE, IA 50477-0178
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