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, STORY CITY, IA 50248-0001
PO BOX 2, STORY CITY, IA 50248-0002
PO BOX 3, STORY CITY, IA 50248-0003
PO BOX 4, STORY CITY, IA 50248-0004
PO BOX 5, STORY CITY, IA 50248-0005
PO BOX 6, STORY CITY, IA 50248-0006
PO BOX 7, STORY CITY, IA 50248-0007
PO BOX 8, STORY CITY, IA 50248-0008
PO BOX 9, STORY CITY, IA 50248-0009
PO BOX 10, STORY CITY, IA 50248-0010
PO BOX 11, STORY CITY, IA 50248-0011
PO BOX 12, STORY CITY, IA 50248-0012
PO BOX 13, STORY CITY, IA 50248-0013
PO BOX 14, STORY CITY, IA 50248-0014
PO BOX 15, STORY CITY, IA 50248-0015
PO BOX 16, STORY CITY, IA 50248-0016
PO BOX 17, STORY CITY, IA 50248-0017
PO BOX 18, STORY CITY, IA 50248-0018
PO BOX 19, STORY CITY, IA 50248-0019
PO BOX 20, STORY CITY, IA 50248-0020
PO BOX 21, STORY CITY, IA 50248-0021
PO BOX 22, STORY CITY, IA 50248-0022
PO BOX 23, STORY CITY, IA 50248-0023
PO BOX 24, STORY CITY, IA 50248-0024
PO BOX 25, STORY CITY, IA 50248-0025
PO BOX 26, STORY CITY, IA 50248-0026
PO BOX 27, STORY CITY, IA 50248-0027
PO BOX 28, STORY CITY, IA 50248-0028
PO BOX 29, STORY CITY, IA 50248-0029
PO BOX 30, STORY CITY, IA 50248-0030
PO BOX 31, STORY CITY, IA 50248-0031
PO BOX 32, STORY CITY, IA 50248-0032
PO BOX 33, STORY CITY, IA 50248-0033
PO BOX 34, STORY CITY, IA 50248-0034
PO BOX 35, STORY CITY, IA 50248-0035
PO BOX 36, STORY CITY, IA 50248-0036
PO BOX 37, STORY CITY, IA 50248-0037
PO BOX 38, STORY CITY, IA 50248-0038
PO BOX 39, STORY CITY, IA 50248-0039
PO BOX 40, STORY CITY, IA 50248-0040
PO BOX 41, STORY CITY, IA 50248-0041
PO BOX 42, STORY CITY, IA 50248-0042
PO BOX 43, STORY CITY, IA 50248-0043
PO BOX 44, STORY CITY, IA 50248-0044
PO BOX 45, STORY CITY, IA 50248-0045
PO BOX 46, STORY CITY, IA 50248-0046
PO BOX 47, STORY CITY, IA 50248-0047
PO BOX 48, STORY CITY, IA 50248-0048
PO BOX 49, STORY CITY, IA 50248-0049
PO BOX 50, STORY CITY, IA 50248-0050
PO BOX 51, STORY CITY, IA 50248-0051
PO BOX 52, STORY CITY, IA 50248-0052
PO BOX 53, STORY CITY, IA 50248-0053
PO BOX 54, STORY CITY, IA 50248-0054
PO BOX 55, STORY CITY, IA 50248-0055
PO BOX 56, STORY CITY, IA 50248-0056
PO BOX 57, STORY CITY, IA 50248-0057
PO BOX 58, STORY CITY, IA 50248-0058
PO BOX 59, STORY CITY, IA 50248-0059
PO BOX 60, STORY CITY, IA 50248-0060
PO BOX 61, STORY CITY, IA 50248-0061
PO BOX 62, STORY CITY, IA 50248-0062
PO BOX 63, STORY CITY, IA 50248-0063
PO BOX 64, STORY CITY, IA 50248-0064
PO BOX 65, STORY CITY, IA 50248-0065
PO BOX 66, STORY CITY, IA 50248-0066
PO BOX 67, STORY CITY, IA 50248-0067
PO BOX 68, STORY CITY, IA 50248-0068
PO BOX 69, STORY CITY, IA 50248-0069
PO BOX 70, STORY CITY, IA 50248-0070
PO BOX 71, STORY CITY, IA 50248-0071
PO BOX 72, STORY CITY, IA 50248-0072
PO BOX 73, STORY CITY, IA 50248-0073
PO BOX 74, STORY CITY, IA 50248-0074
PO BOX 75, STORY CITY, IA 50248-0075
PO BOX 76, STORY CITY, IA 50248-0076
PO BOX 77, STORY CITY, IA 50248-0077
PO BOX 78, STORY CITY, IA 50248-0078
PO BOX 79, STORY CITY, IA 50248-0079
PO BOX 80, STORY CITY, IA 50248-0080
PO BOX 81, STORY CITY, IA 50248-0081
PO BOX 82, STORY CITY, IA 50248-0082
PO BOX 83, STORY CITY, IA 50248-0083
PO BOX 84, STORY CITY, IA 50248-0084
PO BOX 85, STORY CITY, IA 50248-0085
PO BOX 86, STORY CITY, IA 50248-0086
PO BOX 87, STORY CITY, IA 50248-0087
PO BOX 88, STORY CITY, IA 50248-0088
PO BOX 89, STORY CITY, IA 50248-0089
PO BOX 90, STORY CITY, IA 50248-0090
PO BOX 91, STORY CITY, IA 50248-0091
PO BOX 92, STORY CITY, IA 50248-0092
PO BOX 93, STORY CITY, IA 50248-0093
PO BOX 94, STORY CITY, IA 50248-0094
PO BOX 95, STORY CITY, IA 50248-0095
PO BOX 96, STORY CITY, IA 50248-0096
PO BOX 97, STORY CITY, IA 50248-0097
PO BOX 98, STORY CITY, IA 50248-0098
PO BOX 99, STORY CITY, IA 50248-0099
PO BOX 100, STORY CITY, IA 50248-0100
PO BOX 101, STORY CITY, IA 50248-0101
PO BOX 102, STORY CITY, IA 50248-0102
PO BOX 103, STORY CITY, IA 50248-0103
PO BOX 104, STORY CITY, IA 50248-0104
PO BOX 105, STORY CITY, IA 50248-0105
PO BOX 106, STORY CITY, IA 50248-0106
PO BOX 107, STORY CITY, IA 50248-0107
PO BOX 108, STORY CITY, IA 50248-0108
PO BOX 109, STORY CITY, IA 50248-0109
PO BOX 110, STORY CITY, IA 50248-0110
PO BOX 111, STORY CITY, IA 50248-0111
PO BOX 112, STORY CITY, IA 50248-0112
PO BOX 113, STORY CITY, IA 50248-0113
PO BOX 114, STORY CITY, IA 50248-0114
PO BOX 115, STORY CITY, IA 50248-0115
PO BOX 116, STORY CITY, IA 50248-0116
PO BOX 117, STORY CITY, IA 50248-0117
PO BOX 118, STORY CITY, IA 50248-0118
PO BOX 119, STORY CITY, IA 50248-0119
PO BOX 120, STORY CITY, IA 50248-0120
PO BOX 121, STORY CITY, IA 50248-0121
PO BOX 122, STORY CITY, IA 50248-0122
PO BOX 123, STORY CITY, IA 50248-0123
PO BOX 124, STORY CITY, IA 50248-0124
PO BOX 125, STORY CITY, IA 50248-0125
PO BOX 126, STORY CITY, IA 50248-0126
PO BOX 127, STORY CITY, IA 50248-0127
PO BOX 128, STORY CITY, IA 50248-0128
PO BOX 129, STORY CITY, IA 50248-0129
PO BOX 130, STORY CITY, IA 50248-0130
PO BOX 131, STORY CITY, IA 50248-0131
PO BOX 132, STORY CITY, IA 50248-0132
PO BOX 133, STORY CITY, IA 50248-0133
PO BOX 134, STORY CITY, IA 50248-0134
PO BOX 135, STORY CITY, IA 50248-0135
PO BOX 136, STORY CITY, IA 50248-0136
PO BOX 137, STORY CITY, IA 50248-0137
PO BOX 138, STORY CITY, IA 50248-0138
PO BOX 139, STORY CITY, IA 50248-0139
PO BOX 140, STORY CITY, IA 50248-0140
PO BOX 141, STORY CITY, IA 50248-0141
PO BOX 142, STORY CITY, IA 50248-0142
PO BOX 143, STORY CITY, IA 50248-0143
PO BOX 144, STORY CITY, IA 50248-0144
PO BOX 145, STORY CITY, IA 50248-0145
PO BOX 146, STORY CITY, IA 50248-0146
PO BOX 147, STORY CITY, IA 50248-0147
PO BOX 148, STORY CITY, IA 50248-0148
PO BOX 149, STORY CITY, IA 50248-0149
PO BOX 150, STORY CITY, IA 50248-0150
PO BOX 151, STORY CITY, IA 50248-0151
PO BOX 152, STORY CITY, IA 50248-0152
PO BOX 153, STORY CITY, IA 50248-0153
PO BOX 154, STORY CITY, IA 50248-0154
PO BOX 155, STORY CITY, IA 50248-0155
PO BOX 156, STORY CITY, IA 50248-0156
PO BOX 157, STORY CITY, IA 50248-0157
PO BOX 158, STORY CITY, IA 50248-0158
PO BOX 159, STORY CITY, IA 50248-0159
PO BOX 160, STORY CITY, IA 50248-0160
PO BOX 161, STORY CITY, IA 50248-0161
PO BOX 162, STORY CITY, IA 50248-0162
PO BOX 163, STORY CITY, IA 50248-0163
PO BOX 164, STORY CITY, IA 50248-0164
PO BOX 165, STORY CITY, IA 50248-0165
PO BOX 166, STORY CITY, IA 50248-0166
PO BOX 167, STORY CITY, IA 50248-0167
PO BOX 168, STORY CITY, IA 50248-0168
PO BOX 169, STORY CITY, IA 50248-0169
PO BOX 170, STORY CITY, IA 50248-0170
PO BOX 171, STORY CITY, IA 50248-0171
PO BOX 172, STORY CITY, IA 50248-0172
PO BOX 173, STORY CITY, IA 50248-0173
PO BOX 174, STORY CITY, IA 50248-0174
PO BOX 175, STORY CITY, IA 50248-0175
PO BOX 176, STORY CITY, IA 50248-0176
PO BOX 177, STORY CITY, IA 50248-0177
PO BOX 178, STORY CITY, IA 50248-0178
PO BOX 179, STORY CITY, IA 50248-0179
PO BOX 180, STORY CITY, IA 50248-0180
PO BOX 181, STORY CITY, IA 50248-0181
PO BOX 182, STORY CITY, IA 50248-0182
PO BOX 183, STORY CITY, IA 50248-0183
PO BOX 184, STORY CITY, IA 50248-0184
PO BOX 185, STORY CITY, IA 50248-0185
PO BOX 186, STORY CITY, IA 50248-0186
PO BOX 187, STORY CITY, IA 50248-0187
PO BOX 188, STORY CITY, IA 50248-0188
PO BOX 189, STORY CITY, IA 50248-0189
PO BOX 190, STORY CITY, IA 50248-0190
PO BOX 191, STORY CITY, IA 50248-0191
PO BOX 192, STORY CITY, IA 50248-0192
PO BOX 193, STORY CITY, IA 50248-0193
PO BOX 194, STORY CITY, IA 50248-0194
PO BOX 195, STORY CITY, IA 50248-0195
PO BOX 196, STORY CITY, IA 50248-0196
PO BOX 197, STORY CITY, IA 50248-0197
PO BOX 198, STORY CITY, IA 50248-0198
PO BOX 199, STORY CITY, IA 50248-0199
PO BOX 200, STORY CITY, IA 50248-0200
PO BOX 201, STORY CITY, IA 50248-0201
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