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, IOWA FALLS, IA 50126-0001
PO BOX 2, IOWA FALLS, IA 50126-0002
PO BOX 3, IOWA FALLS, IA 50126-0003
PO BOX 4, IOWA FALLS, IA 50126-0004
PO BOX 5, IOWA FALLS, IA 50126-0005
PO BOX 6, IOWA FALLS, IA 50126-0006
PO BOX 7, IOWA FALLS, IA 50126-0007
PO BOX 8, IOWA FALLS, IA 50126-0008
PO BOX 9, IOWA FALLS, IA 50126-0009
PO BOX 10, IOWA FALLS, IA 50126-0010
PO BOX 11, IOWA FALLS, IA 50126-0011
PO BOX 12, IOWA FALLS, IA 50126-0012
PO BOX 13, IOWA FALLS, IA 50126-0013
PO BOX 14, IOWA FALLS, IA 50126-0014
PO BOX 15, IOWA FALLS, IA 50126-0015
PO BOX 16, IOWA FALLS, IA 50126-0016
PO BOX 17, IOWA FALLS, IA 50126-0017
PO BOX 18, IOWA FALLS, IA 50126-0018
PO BOX 19, IOWA FALLS, IA 50126-0019
PO BOX 20, IOWA FALLS, IA 50126-0020
PO BOX 21, IOWA FALLS, IA 50126-0021
PO BOX 22, IOWA FALLS, IA 50126-0022
PO BOX 23, IOWA FALLS, IA 50126-0023
PO BOX 24, IOWA FALLS, IA 50126-0024
PO BOX 25, IOWA FALLS, IA 50126-0025
PO BOX 26, IOWA FALLS, IA 50126-0026
PO BOX 27, IOWA FALLS, IA 50126-0027
PO BOX 28, IOWA FALLS, IA 50126-0028
PO BOX 29, IOWA FALLS, IA 50126-0029
PO BOX 30, IOWA FALLS, IA 50126-0030
PO BOX 31, IOWA FALLS, IA 50126-0031
PO BOX 32, IOWA FALLS, IA 50126-0032
PO BOX 33, IOWA FALLS, IA 50126-0033
PO BOX 34, IOWA FALLS, IA 50126-0034
PO BOX 35, IOWA FALLS, IA 50126-0035
PO BOX 36, IOWA FALLS, IA 50126-0036
PO BOX 37, IOWA FALLS, IA 50126-0037
PO BOX 38, IOWA FALLS, IA 50126-0038
PO BOX 39, IOWA FALLS, IA 50126-0039
PO BOX 40, IOWA FALLS, IA 50126-0040
PO BOX 41, IOWA FALLS, IA 50126-0041
PO BOX 42, IOWA FALLS, IA 50126-0042
PO BOX 43, IOWA FALLS, IA 50126-0043
PO BOX 44, IOWA FALLS, IA 50126-0044
PO BOX 45, IOWA FALLS, IA 50126-0045
PO BOX 46, IOWA FALLS, IA 50126-0046
PO BOX 47, IOWA FALLS, IA 50126-0047
PO BOX 48, IOWA FALLS, IA 50126-0048
PO BOX 49, IOWA FALLS, IA 50126-0049
PO BOX 50, IOWA FALLS, IA 50126-0050
PO BOX 51, IOWA FALLS, IA 50126-0051
PO BOX 52, IOWA FALLS, IA 50126-0052
PO BOX 53, IOWA FALLS, IA 50126-0053
PO BOX 54, IOWA FALLS, IA 50126-0054
PO BOX 55, IOWA FALLS, IA 50126-0055
PO BOX 56, IOWA FALLS, IA 50126-0056
PO BOX 57, IOWA FALLS, IA 50126-0057
PO BOX 58, IOWA FALLS, IA 50126-0058
PO BOX 59, IOWA FALLS, IA 50126-0059
PO BOX 60, IOWA FALLS, IA 50126-0060
PO BOX 61, IOWA FALLS, IA 50126-0061
PO BOX 62, IOWA FALLS, IA 50126-0062
PO BOX 63, IOWA FALLS, IA 50126-0063
PO BOX 64, IOWA FALLS, IA 50126-0064
PO BOX 65, IOWA FALLS, IA 50126-0065
PO BOX 66, IOWA FALLS, IA 50126-0066
PO BOX 67, IOWA FALLS, IA 50126-0067
PO BOX 68, IOWA FALLS, IA 50126-0068
PO BOX 69, IOWA FALLS, IA 50126-0069
PO BOX 70, IOWA FALLS, IA 50126-0070
PO BOX 71, IOWA FALLS, IA 50126-0071
PO BOX 72, IOWA FALLS, IA 50126-0072
PO BOX 73, IOWA FALLS, IA 50126-0073
PO BOX 74, IOWA FALLS, IA 50126-0074
PO BOX 75, IOWA FALLS, IA 50126-0075
PO BOX 76, IOWA FALLS, IA 50126-0076
PO BOX 77, IOWA FALLS, IA 50126-0077
PO BOX 78, IOWA FALLS, IA 50126-0078
PO BOX 79, IOWA FALLS, IA 50126-0079
PO BOX 80, IOWA FALLS, IA 50126-0080
PO BOX 81, IOWA FALLS, IA 50126-0081
PO BOX 82, IOWA FALLS, IA 50126-0082
PO BOX 83, IOWA FALLS, IA 50126-0083
PO BOX 84, IOWA FALLS, IA 50126-0084
PO BOX 85, IOWA FALLS, IA 50126-0085
PO BOX 86, IOWA FALLS, IA 50126-0086
PO BOX 87, IOWA FALLS, IA 50126-0087
PO BOX 88, IOWA FALLS, IA 50126-0088
PO BOX 89, IOWA FALLS, IA 50126-0089
PO BOX 90, IOWA FALLS, IA 50126-0090
PO BOX 91, IOWA FALLS, IA 50126-0091
PO BOX 92, IOWA FALLS, IA 50126-0092
PO BOX 93, IOWA FALLS, IA 50126-0093
PO BOX 94, IOWA FALLS, IA 50126-0094
PO BOX 95, IOWA FALLS, IA 50126-0095
PO BOX 96, IOWA FALLS, IA 50126-0096
PO BOX 97, IOWA FALLS, IA 50126-0097
PO BOX 98, IOWA FALLS, IA 50126-0098
PO BOX 99, IOWA FALLS, IA 50126-0099
PO BOX 100, IOWA FALLS, IA 50126-0100
PO BOX 101, IOWA FALLS, IA 50126-0101
PO BOX 102, IOWA FALLS, IA 50126-0102
PO BOX 103, IOWA FALLS, IA 50126-0103
PO BOX 104, IOWA FALLS, IA 50126-0104
PO BOX 105, IOWA FALLS, IA 50126-0105
PO BOX 106, IOWA FALLS, IA 50126-0106
PO BOX 107, IOWA FALLS, IA 50126-0107
PO BOX 108, IOWA FALLS, IA 50126-0108
PO BOX 109, IOWA FALLS, IA 50126-0109
PO BOX 110, IOWA FALLS, IA 50126-0110
PO BOX 111, IOWA FALLS, IA 50126-0111
PO BOX 112, IOWA FALLS, IA 50126-0112
PO BOX 113, IOWA FALLS, IA 50126-0113
PO BOX 114, IOWA FALLS, IA 50126-0114
PO BOX 115, IOWA FALLS, IA 50126-0115
PO BOX 116, IOWA FALLS, IA 50126-0116
PO BOX 117, IOWA FALLS, IA 50126-0117
PO BOX 118, IOWA FALLS, IA 50126-0118
PO BOX 119, IOWA FALLS, IA 50126-0119
PO BOX 120, IOWA FALLS, IA 50126-0120
PO BOX 121, IOWA FALLS, IA 50126-0121
PO BOX 122, IOWA FALLS, IA 50126-0122
PO BOX 123, IOWA FALLS, IA 50126-0123
PO BOX 124, IOWA FALLS, IA 50126-0124
PO BOX 125, IOWA FALLS, IA 50126-0125
PO BOX 126, IOWA FALLS, IA 50126-0126
PO BOX 127, IOWA FALLS, IA 50126-0127
PO BOX 128, IOWA FALLS, IA 50126-0128
PO BOX 129, IOWA FALLS, IA 50126-0129
PO BOX 130, IOWA FALLS, IA 50126-0130
PO BOX 131, IOWA FALLS, IA 50126-0131
PO BOX 132, IOWA FALLS, IA 50126-0132
PO BOX 133, IOWA FALLS, IA 50126-0133
PO BOX 134, IOWA FALLS, IA 50126-0134
PO BOX 135, IOWA FALLS, IA 50126-0135
PO BOX 136, IOWA FALLS, IA 50126-0136
PO BOX 137, IOWA FALLS, IA 50126-0137
PO BOX 138, IOWA FALLS, IA 50126-0138
PO BOX 139, IOWA FALLS, IA 50126-0139
PO BOX 140, IOWA FALLS, IA 50126-0140
PO BOX 141, IOWA FALLS, IA 50126-0141
PO BOX 142, IOWA FALLS, IA 50126-0142
PO BOX 143, IOWA FALLS, IA 50126-0143
PO BOX 144, IOWA FALLS, IA 50126-0144
PO BOX 145, IOWA FALLS, IA 50126-0145
PO BOX 146, IOWA FALLS, IA 50126-0146
PO BOX 147, IOWA FALLS, IA 50126-0147
PO BOX 148, IOWA FALLS, IA 50126-0148
PO BOX 149, IOWA FALLS, IA 50126-0149
PO BOX 150, IOWA FALLS, IA 50126-0150
PO BOX 151, IOWA FALLS, IA 50126-0151
PO BOX 152, IOWA FALLS, IA 50126-0152
PO BOX 153, IOWA FALLS, IA 50126-0153
PO BOX 154, IOWA FALLS, IA 50126-0154
PO BOX 155, IOWA FALLS, IA 50126-0155
PO BOX 156, IOWA FALLS, IA 50126-0156
PO BOX 157, IOWA FALLS, IA 50126-0157
PO BOX 158, IOWA FALLS, IA 50126-0158
PO BOX 159, IOWA FALLS, IA 50126-0159
PO BOX 160, IOWA FALLS, IA 50126-0160
PO BOX 161, IOWA FALLS, IA 50126-0161
PO BOX 162, IOWA FALLS, IA 50126-0162
PO BOX 163, IOWA FALLS, IA 50126-0163
PO BOX 164, IOWA FALLS, IA 50126-0164
PO BOX 165, IOWA FALLS, IA 50126-0165
PO BOX 166, IOWA FALLS, IA 50126-0166
PO BOX 167, IOWA FALLS, IA 50126-0167
PO BOX 168, IOWA FALLS, IA 50126-0168
PO BOX 169, IOWA FALLS, IA 50126-0169
PO BOX 170, IOWA FALLS, IA 50126-0170
PO BOX 171, IOWA FALLS, IA 50126-0171
PO BOX 172, IOWA FALLS, IA 50126-0172
PO BOX 173, IOWA FALLS, IA 50126-0173
PO BOX 174, IOWA FALLS, IA 50126-0174
PO BOX 175, IOWA FALLS, IA 50126-0175
PO BOX 176, IOWA FALLS, IA 50126-0176
PO BOX 177, IOWA FALLS, IA 50126-0177
PO BOX 178, IOWA FALLS, IA 50126-0178
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