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, JESUP, IA 50648-0001
PO BOX 2, JESUP, IA 50648-0002
PO BOX 3, JESUP, IA 50648-0003
PO BOX 4, JESUP, IA 50648-0004
PO BOX 5, JESUP, IA 50648-0005
PO BOX 6, JESUP, IA 50648-0006
PO BOX 7, JESUP, IA 50648-0007
PO BOX 8, JESUP, IA 50648-0008
PO BOX 9, JESUP, IA 50648-0009
PO BOX 10, JESUP, IA 50648-0010
PO BOX 11, JESUP, IA 50648-0011
PO BOX 12, JESUP, IA 50648-0012
PO BOX 13, JESUP, IA 50648-0013
PO BOX 14, JESUP, IA 50648-0014
PO BOX 15, JESUP, IA 50648-0015
PO BOX 16, JESUP, IA 50648-0016
PO BOX 17, JESUP, IA 50648-0017
PO BOX 18, JESUP, IA 50648-0018
PO BOX 19, JESUP, IA 50648-0019
PO BOX 20, JESUP, IA 50648-0020
PO BOX 21, JESUP, IA 50648-0021
PO BOX 22, JESUP, IA 50648-0022
PO BOX 23, JESUP, IA 50648-0023
PO BOX 24, JESUP, IA 50648-0024
PO BOX 25, JESUP, IA 50648-0025
PO BOX 26, JESUP, IA 50648-0026
PO BOX 27, JESUP, IA 50648-0027
PO BOX 28, JESUP, IA 50648-0028
PO BOX 29, JESUP, IA 50648-0029
PO BOX 30, JESUP, IA 50648-0030
PO BOX 31, JESUP, IA 50648-0031
PO BOX 32, JESUP, IA 50648-0032
PO BOX 33, JESUP, IA 50648-0033
PO BOX 34, JESUP, IA 50648-0034
PO BOX 35, JESUP, IA 50648-0035
PO BOX 36, JESUP, IA 50648-0036
PO BOX 37, JESUP, IA 50648-0037
PO BOX 38, JESUP, IA 50648-0038
PO BOX 39, JESUP, IA 50648-0039
PO BOX 40, JESUP, IA 50648-0040
PO BOX 41, JESUP, IA 50648-0041
PO BOX 42, JESUP, IA 50648-0042
PO BOX 43, JESUP, IA 50648-0043
PO BOX 44, JESUP, IA 50648-0044
PO BOX 45, JESUP, IA 50648-0045
PO BOX 46, JESUP, IA 50648-0046
PO BOX 47, JESUP, IA 50648-0047
PO BOX 48, JESUP, IA 50648-0048
PO BOX 49, JESUP, IA 50648-0049
PO BOX 50, JESUP, IA 50648-0050
PO BOX 51, JESUP, IA 50648-0051
PO BOX 52, JESUP, IA 50648-0052
PO BOX 53, JESUP, IA 50648-0053
PO BOX 54, JESUP, IA 50648-0054
PO BOX 55, JESUP, IA 50648-0055
PO BOX 56, JESUP, IA 50648-0056
PO BOX 57, JESUP, IA 50648-0057
PO BOX 58, JESUP, IA 50648-0058
PO BOX 59, JESUP, IA 50648-0059
PO BOX 60, JESUP, IA 50648-0060
PO BOX 61, JESUP, IA 50648-0061
PO BOX 62, JESUP, IA 50648-0062
PO BOX 63, JESUP, IA 50648-0063
PO BOX 64, JESUP, IA 50648-0064
PO BOX 65, JESUP, IA 50648-0065
PO BOX 66, JESUP, IA 50648-0066
PO BOX 67, JESUP, IA 50648-0067
PO BOX 68, JESUP, IA 50648-0068
PO BOX 69, JESUP, IA 50648-0069
PO BOX 70, JESUP, IA 50648-0070
PO BOX 71, JESUP, IA 50648-0071
PO BOX 72, JESUP, IA 50648-0072
PO BOX 73, JESUP, IA 50648-0073
PO BOX 74, JESUP, IA 50648-0074
PO BOX 75, JESUP, IA 50648-0075
PO BOX 76, JESUP, IA 50648-0076
PO BOX 77, JESUP, IA 50648-0077
PO BOX 78, JESUP, IA 50648-0078
PO BOX 79, JESUP, IA 50648-0079
PO BOX 80, JESUP, IA 50648-0080
PO BOX 81, JESUP, IA 50648-0081
PO BOX 82, JESUP, IA 50648-0082
PO BOX 83, JESUP, IA 50648-0083
PO BOX 84, JESUP, IA 50648-0084
PO BOX 85, JESUP, IA 50648-0085
PO BOX 86, JESUP, IA 50648-0086
PO BOX 87, JESUP, IA 50648-0087
PO BOX 88, JESUP, IA 50648-0088
PO BOX 89, JESUP, IA 50648-0089
PO BOX 90, JESUP, IA 50648-0090
PO BOX 91, JESUP, IA 50648-0091
PO BOX 92, JESUP, IA 50648-0092
PO BOX 93, JESUP, IA 50648-0093
PO BOX 94, JESUP, IA 50648-0094
PO BOX 95, JESUP, IA 50648-0095
PO BOX 96, JESUP, IA 50648-0096
PO BOX 97, JESUP, IA 50648-0097
PO BOX 98, JESUP, IA 50648-0098
PO BOX 99, JESUP, IA 50648-0099
PO BOX 100, JESUP, IA 50648-0100
PO BOX 101, JESUP, IA 50648-0101
PO BOX 102, JESUP, IA 50648-0102
PO BOX 103, JESUP, IA 50648-0103
PO BOX 104, JESUP, IA 50648-0104
PO BOX 105, JESUP, IA 50648-0105
PO BOX 106, JESUP, IA 50648-0106
PO BOX 107, JESUP, IA 50648-0107
PO BOX 108, JESUP, IA 50648-0108
PO BOX 109, JESUP, IA 50648-0109
PO BOX 110, JESUP, IA 50648-0110
PO BOX 111, JESUP, IA 50648-0111
PO BOX 112, JESUP, IA 50648-0112
PO BOX 113, JESUP, IA 50648-0113
PO BOX 114, JESUP, IA 50648-0114
PO BOX 115, JESUP, IA 50648-0115
PO BOX 116, JESUP, IA 50648-0116
PO BOX 117, JESUP, IA 50648-0117
PO BOX 118, JESUP, IA 50648-0118
PO BOX 119, JESUP, IA 50648-0119
PO BOX 120, JESUP, IA 50648-0120
PO BOX 121, JESUP, IA 50648-0121
PO BOX 122, JESUP, IA 50648-0122
PO BOX 123, JESUP, IA 50648-0123
PO BOX 124, JESUP, IA 50648-0124
PO BOX 125, JESUP, IA 50648-0125
PO BOX 126, JESUP, IA 50648-0126
PO BOX 127, JESUP, IA 50648-0127
PO BOX 128, JESUP, IA 50648-0128
PO BOX 129, JESUP, IA 50648-0129
PO BOX 130, JESUP, IA 50648-0130
PO BOX 131, JESUP, IA 50648-0131
PO BOX 132, JESUP, IA 50648-0132
PO BOX 133, JESUP, IA 50648-0133
PO BOX 134, JESUP, IA 50648-0134
PO BOX 135, JESUP, IA 50648-0135
PO BOX 136, JESUP, IA 50648-0136
PO BOX 137, JESUP, IA 50648-0137
PO BOX 138, JESUP, IA 50648-0138
PO BOX 139, JESUP, IA 50648-0139
PO BOX 140, JESUP, IA 50648-0140
PO BOX 141, JESUP, IA 50648-0141
PO BOX 142, JESUP, IA 50648-0142
PO BOX 143, JESUP, IA 50648-0143
PO BOX 144, JESUP, IA 50648-0144
PO BOX 145, JESUP, IA 50648-0145
PO BOX 146, JESUP, IA 50648-0146
PO BOX 147, JESUP, IA 50648-0147
PO BOX 148, JESUP, IA 50648-0148
PO BOX 149, JESUP, IA 50648-0149
PO BOX 150, JESUP, IA 50648-0150
PO BOX 151, JESUP, IA 50648-0151
PO BOX 152, JESUP, IA 50648-0152
PO BOX 153, JESUP, IA 50648-0153
PO BOX 154, JESUP, IA 50648-0154
PO BOX 155, JESUP, IA 50648-0155
PO BOX 156, JESUP, IA 50648-0156
PO BOX 157, JESUP, IA 50648-0157
PO BOX 158, JESUP, IA 50648-0158
PO BOX 159, JESUP, IA 50648-0159
PO BOX 160, JESUP, IA 50648-0160
PO BOX 161, JESUP, IA 50648-0161
PO BOX 162, JESUP, IA 50648-0162
PO BOX 163, JESUP, IA 50648-0163
PO BOX 164, JESUP, IA 50648-0164
PO BOX 165, JESUP, IA 50648-0165
PO BOX 166, JESUP, IA 50648-0166
PO BOX 167, JESUP, IA 50648-0167
PO BOX 168, JESUP, IA 50648-0168
PO BOX 169, JESUP, IA 50648-0169
PO BOX 170, JESUP, IA 50648-0170
PO BOX 171, JESUP, IA 50648-0171
PO BOX 172, JESUP, IA 50648-0172
PO BOX 173, JESUP, IA 50648-0173
PO BOX 174, JESUP, IA 50648-0174
PO BOX 175, JESUP, IA 50648-0175
PO BOX 176, JESUP, IA 50648-0176
PO BOX 177, JESUP, IA 50648-0177
PO BOX 178, JESUP, IA 50648-0178
PO BOX 179, JESUP, IA 50648-0179
PO BOX 180, JESUP, IA 50648-0180
PO BOX 181, JESUP, IA 50648-0181
PO BOX 182, JESUP, IA 50648-0182
PO BOX 183, JESUP, IA 50648-0183
PO BOX 184, JESUP, IA 50648-0184
PO BOX 185, JESUP, IA 50648-0185
PO BOX 186, JESUP, IA 50648-0186
PO BOX 187, JESUP, IA 50648-0187
PO BOX 188, JESUP, IA 50648-0188
PO BOX 189, JESUP, IA 50648-0189
PO BOX 190, JESUP, IA 50648-0190
PO BOX 191, JESUP, IA 50648-0191
PO BOX 192, JESUP, IA 50648-0192
PO BOX 193, JESUP, IA 50648-0193
PO BOX 194, JESUP, IA 50648-0194
PO BOX 195, JESUP, IA 50648-0195
PO BOX 196, JESUP, IA 50648-0196
PO BOX 197, JESUP, IA 50648-0197
PO BOX 198, JESUP, IA 50648-0198
PO BOX 199, JESUP, IA 50648-0199
PO BOX 200, JESUP, IA 50648-0200
PO BOX 201, JESUP, IA 50648-0201
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