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, WESTPHALIA, IA 51578-0001
PO BOX 2, WESTPHALIA, IA 51578-0002
PO BOX 3, WESTPHALIA, IA 51578-0003
PO BOX 4, WESTPHALIA, IA 51578-0004
PO BOX 5, WESTPHALIA, IA 51578-0005
PO BOX 6, WESTPHALIA, IA 51578-0006
PO BOX 7, WESTPHALIA, IA 51578-0007
PO BOX 8, WESTPHALIA, IA 51578-0008
PO BOX 9, WESTPHALIA, IA 51578-0009
PO BOX 10, WESTPHALIA, IA 51578-0010
PO BOX 11, WESTPHALIA, IA 51578-0011
PO BOX 12, WESTPHALIA, IA 51578-0012
PO BOX 13, WESTPHALIA, IA 51578-0013
PO BOX 14, WESTPHALIA, IA 51578-0014
PO BOX 15, WESTPHALIA, IA 51578-0015
PO BOX 16, WESTPHALIA, IA 51578-0016
PO BOX 17, WESTPHALIA, IA 51578-0017
PO BOX 18, WESTPHALIA, IA 51578-0018
PO BOX 19, WESTPHALIA, IA 51578-0019
PO BOX 20, WESTPHALIA, IA 51578-0020
PO BOX 21, WESTPHALIA, IA 51578-0021
PO BOX 22, WESTPHALIA, IA 51578-0022
PO BOX 23, WESTPHALIA, IA 51578-0023
PO BOX 24, WESTPHALIA, IA 51578-0024
PO BOX 25, WESTPHALIA, IA 51578-0025
PO BOX 26, WESTPHALIA, IA 51578-0026
PO BOX 27, WESTPHALIA, IA 51578-0027
PO BOX 28, WESTPHALIA, IA 51578-0028
PO BOX 29, WESTPHALIA, IA 51578-0029
PO BOX 30, WESTPHALIA, IA 51578-0030
PO BOX 31, WESTPHALIA, IA 51578-0031
PO BOX 32, WESTPHALIA, IA 51578-0032
PO BOX 33, WESTPHALIA, IA 51578-0033
PO BOX 34, WESTPHALIA, IA 51578-0034
PO BOX 35, WESTPHALIA, IA 51578-0035
PO BOX 36, WESTPHALIA, IA 51578-0036
PO BOX 37, WESTPHALIA, IA 51578-0037
PO BOX 38, WESTPHALIA, IA 51578-0038
PO BOX 39, WESTPHALIA, IA 51578-0039
PO BOX 40, WESTPHALIA, IA 51578-0040
PO BOX 41, WESTPHALIA, IA 51578-0041
PO BOX 42, WESTPHALIA, IA 51578-0042
PO BOX 43, WESTPHALIA, IA 51578-0043
PO BOX 44, WESTPHALIA, IA 51578-0044
PO BOX 45, WESTPHALIA, IA 51578-0045
PO BOX 46, WESTPHALIA, IA 51578-0046
PO BOX 47, WESTPHALIA, IA 51578-0047
PO BOX 48, WESTPHALIA, IA 51578-0048
PO BOX 49, WESTPHALIA, IA 51578-0049
PO BOX 50, WESTPHALIA, IA 51578-0050
PO BOX 51, WESTPHALIA, IA 51578-0051
PO BOX 52, WESTPHALIA, IA 51578-0052
PO BOX 53, WESTPHALIA, IA 51578-0053
PO BOX 54, WESTPHALIA, IA 51578-0054
PO BOX 55, WESTPHALIA, IA 51578-0055
PO BOX 56, WESTPHALIA, IA 51578-0056
PO BOX 57, WESTPHALIA, IA 51578-0057
PO BOX 58, WESTPHALIA, IA 51578-0058
PO BOX 59, WESTPHALIA, IA 51578-0059
PO BOX 60, WESTPHALIA, IA 51578-0060
PO BOX 61, WESTPHALIA, IA 51578-0061
PO BOX 62, WESTPHALIA, IA 51578-0062
PO BOX 63, WESTPHALIA, IA 51578-0063
PO BOX 64, WESTPHALIA, IA 51578-0064
PO BOX 65, WESTPHALIA, IA 51578-0065
PO BOX 66, WESTPHALIA, IA 51578-0066
PO BOX 67, WESTPHALIA, IA 51578-0067
PO BOX 68, WESTPHALIA, IA 51578-0068
PO BOX 69, WESTPHALIA, IA 51578-0069
PO BOX 70, WESTPHALIA, IA 51578-0070
PO BOX 71, WESTPHALIA, IA 51578-0071
PO BOX 72, WESTPHALIA, IA 51578-0072
PO BOX 73, WESTPHALIA, IA 51578-0073
PO BOX 74, WESTPHALIA, IA 51578-0074
PO BOX 75, WESTPHALIA, IA 51578-0075
PO BOX 76, WESTPHALIA, IA 51578-0076
PO BOX 77, WESTPHALIA, IA 51578-0077
PO BOX 78, WESTPHALIA, IA 51578-0078
PO BOX 79, WESTPHALIA, IA 51578-0079
PO BOX 80, WESTPHALIA, IA 51578-0080
PO BOX 81, WESTPHALIA, IA 51578-0081
PO BOX 82, WESTPHALIA, IA 51578-0082
PO BOX 83, WESTPHALIA, IA 51578-0083
PO BOX 84, WESTPHALIA, IA 51578-0084
PO BOX 85, WESTPHALIA, IA 51578-0085
PO BOX 86, WESTPHALIA, IA 51578-0086
PO BOX 87, WESTPHALIA, IA 51578-0087
PO BOX 88, WESTPHALIA, IA 51578-0088
PO BOX 89, WESTPHALIA, IA 51578-0089
PO BOX 90, WESTPHALIA, IA 51578-0090
PO BOX 91, WESTPHALIA, IA 51578-0091
PO BOX 92, WESTPHALIA, IA 51578-0092
PO BOX 93, WESTPHALIA, IA 51578-0093
PO BOX 94, WESTPHALIA, IA 51578-0094
PO BOX 95, WESTPHALIA, IA 51578-0095
PO BOX 96, WESTPHALIA, IA 51578-0096
PO BOX 97, WESTPHALIA, IA 51578-0097
PO BOX 98, WESTPHALIA, IA 51578-0098
PO BOX 99, WESTPHALIA, IA 51578-0099
PO BOX 100, WESTPHALIA, IA 51578-0100
PO BOX 101, WESTPHALIA, IA 51578-0101
PO BOX 102, WESTPHALIA, IA 51578-0102
PO BOX 103, WESTPHALIA, IA 51578-0103
PO BOX 104, WESTPHALIA, IA 51578-0104
PO BOX 105, WESTPHALIA, IA 51578-0105
PO BOX 106, WESTPHALIA, IA 51578-0106
PO BOX 107, WESTPHALIA, IA 51578-0107
PO BOX 108, WESTPHALIA, IA 51578-0108
PO BOX 109, WESTPHALIA, IA 51578-0109
PO BOX 110, WESTPHALIA, IA 51578-0110
PO BOX 111, WESTPHALIA, IA 51578-0111
PO BOX 112, WESTPHALIA, IA 51578-0112
PO BOX 113, WESTPHALIA, IA 51578-0113
PO BOX 114, WESTPHALIA, IA 51578-0114
PO BOX 115, WESTPHALIA, IA 51578-0115
PO BOX 116, WESTPHALIA, IA 51578-0116
PO BOX 117, WESTPHALIA, IA 51578-0117
PO BOX 118, WESTPHALIA, IA 51578-0118
PO BOX 119, WESTPHALIA, IA 51578-0119
PO BOX 120, WESTPHALIA, IA 51578-0120
PO BOX 121, WESTPHALIA, IA 51578-0121
PO BOX 122, WESTPHALIA, IA 51578-0122
PO BOX 123, WESTPHALIA, IA 51578-0123
PO BOX 124, WESTPHALIA, IA 51578-0124
PO BOX 125, WESTPHALIA, IA 51578-0125
PO BOX 126, WESTPHALIA, IA 51578-0126
PO BOX 127, WESTPHALIA, IA 51578-0127
PO BOX 128, WESTPHALIA, IA 51578-0128
PO BOX 129, WESTPHALIA, IA 51578-0129
PO BOX 130, WESTPHALIA, IA 51578-0130
PO BOX 131, WESTPHALIA, IA 51578-0131
PO BOX 132, WESTPHALIA, IA 51578-0132
PO BOX 133, WESTPHALIA, IA 51578-0133
PO BOX 134, WESTPHALIA, IA 51578-0134
PO BOX 135, WESTPHALIA, IA 51578-0135
PO BOX 136, WESTPHALIA, IA 51578-0136
PO BOX 137, WESTPHALIA, IA 51578-0137
PO BOX 138, WESTPHALIA, IA 51578-0138
PO BOX 139, WESTPHALIA, IA 51578-0139
PO BOX 140, WESTPHALIA, IA 51578-0140
PO BOX 141, WESTPHALIA, IA 51578-0141
PO BOX 142, WESTPHALIA, IA 51578-0142
PO BOX 143, WESTPHALIA, IA 51578-0143
PO BOX 144, WESTPHALIA, IA 51578-0144
PO BOX 145, WESTPHALIA, IA 51578-0145
PO BOX 146, WESTPHALIA, IA 51578-0146
PO BOX 147, WESTPHALIA, IA 51578-0147
PO BOX 148, WESTPHALIA, IA 51578-0148
PO BOX 149, WESTPHALIA, IA 51578-0149
PO BOX 150, WESTPHALIA, IA 51578-0150
PO BOX 151, WESTPHALIA, IA 51578-0151
PO BOX 152, WESTPHALIA, IA 51578-0152
PO BOX 153, WESTPHALIA, IA 51578-0153
PO BOX 154, WESTPHALIA, IA 51578-0154
PO BOX 155, WESTPHALIA, IA 51578-0155
PO BOX 156, WESTPHALIA, IA 51578-0156
PO BOX 157, WESTPHALIA, IA 51578-0157
PO BOX 158, WESTPHALIA, IA 51578-0158
PO BOX 159, WESTPHALIA, IA 51578-0159
PO BOX 160, WESTPHALIA, IA 51578-0160
PO BOX 161, WESTPHALIA, IA 51578-0161
PO BOX 162, WESTPHALIA, IA 51578-0162
PO BOX 163, WESTPHALIA, IA 51578-0163
PO BOX 164, WESTPHALIA, IA 51578-0164
PO BOX 165, WESTPHALIA, IA 51578-0165
PO BOX 166, WESTPHALIA, IA 51578-0166
PO BOX 167, WESTPHALIA, IA 51578-0167
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