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, SAC CITY, IA 50583-0001
PO BOX 2, SAC CITY, IA 50583-0002
PO BOX 3, SAC CITY, IA 50583-0003
PO BOX 4, SAC CITY, IA 50583-0004
PO BOX 5, SAC CITY, IA 50583-0005
PO BOX 6, SAC CITY, IA 50583-0006
PO BOX 7, SAC CITY, IA 50583-0007
PO BOX 8, SAC CITY, IA 50583-0008
PO BOX 9, SAC CITY, IA 50583-0009
PO BOX 10, SAC CITY, IA 50583-0010
PO BOX 11, SAC CITY, IA 50583-0011
PO BOX 12, SAC CITY, IA 50583-0012
PO BOX 13, SAC CITY, IA 50583-0013
PO BOX 14, SAC CITY, IA 50583-0014
PO BOX 15, SAC CITY, IA 50583-0015
PO BOX 16, SAC CITY, IA 50583-0016
PO BOX 17, SAC CITY, IA 50583-0017
PO BOX 18, SAC CITY, IA 50583-0018
PO BOX 19, SAC CITY, IA 50583-0019
PO BOX 20, SAC CITY, IA 50583-0020
PO BOX 21, SAC CITY, IA 50583-0021
PO BOX 22, SAC CITY, IA 50583-0022
PO BOX 23, SAC CITY, IA 50583-0023
PO BOX 24, SAC CITY, IA 50583-0024
PO BOX 25, SAC CITY, IA 50583-0025
PO BOX 26, SAC CITY, IA 50583-0026
PO BOX 27, SAC CITY, IA 50583-0027
PO BOX 28, SAC CITY, IA 50583-0028
PO BOX 29, SAC CITY, IA 50583-0029
PO BOX 30, SAC CITY, IA 50583-0030
PO BOX 31, SAC CITY, IA 50583-0031
PO BOX 32, SAC CITY, IA 50583-0032
PO BOX 33, SAC CITY, IA 50583-0033
PO BOX 34, SAC CITY, IA 50583-0034
PO BOX 35, SAC CITY, IA 50583-0035
PO BOX 36, SAC CITY, IA 50583-0036
PO BOX 37, SAC CITY, IA 50583-0037
PO BOX 38, SAC CITY, IA 50583-0038
PO BOX 39, SAC CITY, IA 50583-0039
PO BOX 40, SAC CITY, IA 50583-0040
PO BOX 41, SAC CITY, IA 50583-0041
PO BOX 42, SAC CITY, IA 50583-0042
PO BOX 43, SAC CITY, IA 50583-0043
PO BOX 44, SAC CITY, IA 50583-0044
PO BOX 45, SAC CITY, IA 50583-0045
PO BOX 46, SAC CITY, IA 50583-0046
PO BOX 47, SAC CITY, IA 50583-0047
PO BOX 48, SAC CITY, IA 50583-0048
PO BOX 49, SAC CITY, IA 50583-0049
PO BOX 50, SAC CITY, IA 50583-0050
PO BOX 51, SAC CITY, IA 50583-0051
PO BOX 52, SAC CITY, IA 50583-0052
PO BOX 53, SAC CITY, IA 50583-0053
PO BOX 54, SAC CITY, IA 50583-0054
PO BOX 55, SAC CITY, IA 50583-0055
PO BOX 56, SAC CITY, IA 50583-0056
PO BOX 57, SAC CITY, IA 50583-0057
PO BOX 58, SAC CITY, IA 50583-0058
PO BOX 59, SAC CITY, IA 50583-0059
PO BOX 60, SAC CITY, IA 50583-0060
PO BOX 61, SAC CITY, IA 50583-0061
PO BOX 62, SAC CITY, IA 50583-0062
PO BOX 63, SAC CITY, IA 50583-0063
PO BOX 64, SAC CITY, IA 50583-0064
PO BOX 65, SAC CITY, IA 50583-0065
PO BOX 66, SAC CITY, IA 50583-0066
PO BOX 67, SAC CITY, IA 50583-0067
PO BOX 68, SAC CITY, IA 50583-0068
PO BOX 69, SAC CITY, IA 50583-0069
PO BOX 70, SAC CITY, IA 50583-0070
PO BOX 71, SAC CITY, IA 50583-0071
PO BOX 72, SAC CITY, IA 50583-0072
PO BOX 73, SAC CITY, IA 50583-0073
PO BOX 74, SAC CITY, IA 50583-0074
PO BOX 75, SAC CITY, IA 50583-0075
PO BOX 76, SAC CITY, IA 50583-0076
PO BOX 77, SAC CITY, IA 50583-0077
PO BOX 78, SAC CITY, IA 50583-0078
PO BOX 79, SAC CITY, IA 50583-0079
PO BOX 80, SAC CITY, IA 50583-0080
PO BOX 81, SAC CITY, IA 50583-0081
PO BOX 82, SAC CITY, IA 50583-0082
PO BOX 83, SAC CITY, IA 50583-0083
PO BOX 84, SAC CITY, IA 50583-0084
PO BOX 85, SAC CITY, IA 50583-0085
PO BOX 86, SAC CITY, IA 50583-0086
PO BOX 87, SAC CITY, IA 50583-0087
PO BOX 88, SAC CITY, IA 50583-0088
PO BOX 89, SAC CITY, IA 50583-0089
PO BOX 90, SAC CITY, IA 50583-0090
PO BOX 91, SAC CITY, IA 50583-0091
PO BOX 92, SAC CITY, IA 50583-0092
PO BOX 93, SAC CITY, IA 50583-0093
PO BOX 94, SAC CITY, IA 50583-0094
PO BOX 95, SAC CITY, IA 50583-0095
PO BOX 96, SAC CITY, IA 50583-0096
PO BOX 97, SAC CITY, IA 50583-0097
PO BOX 98, SAC CITY, IA 50583-0098
PO BOX 99, SAC CITY, IA 50583-0099
PO BOX 100, SAC CITY, IA 50583-0100
PO BOX 101, SAC CITY, IA 50583-0101
PO BOX 102, SAC CITY, IA 50583-0102
PO BOX 103, SAC CITY, IA 50583-0103
PO BOX 104, SAC CITY, IA 50583-0104
PO BOX 105, SAC CITY, IA 50583-0105
PO BOX 106, SAC CITY, IA 50583-0106
PO BOX 107, SAC CITY, IA 50583-0107
PO BOX 108, SAC CITY, IA 50583-0108
PO BOX 109, SAC CITY, IA 50583-0109
PO BOX 110, SAC CITY, IA 50583-0110
PO BOX 111, SAC CITY, IA 50583-0111
PO BOX 112, SAC CITY, IA 50583-0112
PO BOX 113, SAC CITY, IA 50583-0113
PO BOX 114, SAC CITY, IA 50583-0114
PO BOX 115, SAC CITY, IA 50583-0115
PO BOX 116, SAC CITY, IA 50583-0116
PO BOX 117, SAC CITY, IA 50583-0117
PO BOX 118, SAC CITY, IA 50583-0118
PO BOX 119, SAC CITY, IA 50583-0119
PO BOX 120, SAC CITY, IA 50583-0120
PO BOX 121, SAC CITY, IA 50583-0121
PO BOX 122, SAC CITY, IA 50583-0122
PO BOX 123, SAC CITY, IA 50583-0123
PO BOX 124, SAC CITY, IA 50583-0124
PO BOX 125, SAC CITY, IA 50583-0125
PO BOX 126, SAC CITY, IA 50583-0126
PO BOX 127, SAC CITY, IA 50583-0127
PO BOX 128, SAC CITY, IA 50583-0128
PO BOX 129, SAC CITY, IA 50583-0129
PO BOX 130, SAC CITY, IA 50583-0130
PO BOX 131, SAC CITY, IA 50583-0131
PO BOX 132, SAC CITY, IA 50583-0132
PO BOX 133, SAC CITY, IA 50583-0133
PO BOX 134, SAC CITY, IA 50583-0134
PO BOX 135, SAC CITY, IA 50583-0135
PO BOX 136, SAC CITY, IA 50583-0136
PO BOX 137, SAC CITY, IA 50583-0137
PO BOX 138, SAC CITY, IA 50583-0138
PO BOX 139, SAC CITY, IA 50583-0139
PO BOX 140, SAC CITY, IA 50583-0140
PO BOX 141, SAC CITY, IA 50583-0141
PO BOX 142, SAC CITY, IA 50583-0142
PO BOX 143, SAC CITY, IA 50583-0143
PO BOX 144, SAC CITY, IA 50583-0144
PO BOX 145, SAC CITY, IA 50583-0145
PO BOX 146, SAC CITY, IA 50583-0146
PO BOX 147, SAC CITY, IA 50583-0147
PO BOX 148, SAC CITY, IA 50583-0148
PO BOX 149, SAC CITY, IA 50583-0149
PO BOX 150, SAC CITY, IA 50583-0150
PO BOX 151, SAC CITY, IA 50583-0151
PO BOX 152, SAC CITY, IA 50583-0152
PO BOX 153, SAC CITY, IA 50583-0153
PO BOX 154, SAC CITY, IA 50583-0154
PO BOX 155, SAC CITY, IA 50583-0155
PO BOX 156, SAC CITY, IA 50583-0156
PO BOX 157, SAC CITY, IA 50583-0157
PO BOX 158, SAC CITY, IA 50583-0158
PO BOX 159, SAC CITY, IA 50583-0159
PO BOX 160, SAC CITY, IA 50583-0160
PO BOX 161, SAC CITY, IA 50583-0161
PO BOX 162, SAC CITY, IA 50583-0162
PO BOX 163, SAC CITY, IA 50583-0163
PO BOX 164, SAC CITY, IA 50583-0164
PO BOX 165, SAC CITY, IA 50583-0165
PO BOX 166, SAC CITY, IA 50583-0166
PO BOX 167, SAC CITY, IA 50583-0167
PO BOX 168, SAC CITY, IA 50583-0168
PO BOX 169, SAC CITY, IA 50583-0169
PO BOX 170, SAC CITY, IA 50583-0170
PO BOX 171, SAC CITY, IA 50583-0171
PO BOX 172, SAC CITY, IA 50583-0172
PO BOX 173, SAC CITY, IA 50583-0173
PO BOX 174, SAC CITY, IA 50583-0174
PO BOX 175, SAC CITY, IA 50583-0175
PO BOX 176, SAC CITY, IA 50583-0176
PO BOX 177, SAC CITY, IA 50583-0177
PO BOX 178, SAC CITY, IA 50583-0178
PO BOX 179, SAC CITY, IA 50583-0179
PO BOX 180, SAC CITY, IA 50583-0180
PO BOX 181, SAC CITY, IA 50583-0181
PO BOX 182, SAC CITY, IA 50583-0182
PO BOX 183, SAC CITY, IA 50583-0183
PO BOX 184, SAC CITY, IA 50583-0184
PO BOX 185, SAC CITY, IA 50583-0185
PO BOX 186, SAC CITY, IA 50583-0186
PO BOX 187, SAC CITY, IA 50583-0187
PO BOX 188, SAC CITY, IA 50583-0188
PO BOX 189, SAC CITY, IA 50583-0189
PO BOX 190, SAC CITY, IA 50583-0190
PO BOX 191, SAC CITY, IA 50583-0191
PO BOX 192, SAC CITY, IA 50583-0192
PO BOX 193, SAC CITY, IA 50583-0193
PO BOX 194, SAC CITY, IA 50583-0194
PO BOX 195, SAC CITY, IA 50583-0195
PO BOX 196, SAC CITY, IA 50583-0196
PO BOX 197, SAC CITY, IA 50583-0197
PO BOX 198, SAC CITY, IA 50583-0198
PO BOX 199, SAC CITY, IA 50583-0199
PO BOX 200, SAC CITY, IA 50583-0200
PO BOX 201, SAC CITY, IA 50583-0201
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