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, ALDEN, IA 50006-0001
PO BOX 2, ALDEN, IA 50006-0002
PO BOX 3, ALDEN, IA 50006-0003
PO BOX 4, ALDEN, IA 50006-0004
PO BOX 5, ALDEN, IA 50006-0005
PO BOX 6, ALDEN, IA 50006-0006
PO BOX 7, ALDEN, IA 50006-0007
PO BOX 8, ALDEN, IA 50006-0008
PO BOX 9, ALDEN, IA 50006-0009
PO BOX 10, ALDEN, IA 50006-0010
PO BOX 11, ALDEN, IA 50006-0011
PO BOX 12, ALDEN, IA 50006-0012
PO BOX 13, ALDEN, IA 50006-0013
PO BOX 14, ALDEN, IA 50006-0014
PO BOX 15, ALDEN, IA 50006-0015
PO BOX 16, ALDEN, IA 50006-0016
PO BOX 17, ALDEN, IA 50006-0017
PO BOX 18, ALDEN, IA 50006-0018
PO BOX 19, ALDEN, IA 50006-0019
PO BOX 20, ALDEN, IA 50006-0020
PO BOX 21, ALDEN, IA 50006-0021
PO BOX 22, ALDEN, IA 50006-0022
PO BOX 23, ALDEN, IA 50006-0023
PO BOX 24, ALDEN, IA 50006-0024
PO BOX 25, ALDEN, IA 50006-0025
PO BOX 26, ALDEN, IA 50006-0026
PO BOX 27, ALDEN, IA 50006-0027
PO BOX 28, ALDEN, IA 50006-0028
PO BOX 29, ALDEN, IA 50006-0029
PO BOX 30, ALDEN, IA 50006-0030
PO BOX 31, ALDEN, IA 50006-0031
PO BOX 32, ALDEN, IA 50006-0032
PO BOX 33, ALDEN, IA 50006-0033
PO BOX 34, ALDEN, IA 50006-0034
PO BOX 35, ALDEN, IA 50006-0035
PO BOX 36, ALDEN, IA 50006-0036
PO BOX 37, ALDEN, IA 50006-0037
PO BOX 38, ALDEN, IA 50006-0038
PO BOX 39, ALDEN, IA 50006-0039
PO BOX 40, ALDEN, IA 50006-0040
PO BOX 41, ALDEN, IA 50006-0041
PO BOX 42, ALDEN, IA 50006-0042
PO BOX 43, ALDEN, IA 50006-0043
PO BOX 44, ALDEN, IA 50006-0044
PO BOX 45, ALDEN, IA 50006-0045
PO BOX 46, ALDEN, IA 50006-0046
PO BOX 47, ALDEN, IA 50006-0047
PO BOX 48, ALDEN, IA 50006-0048
PO BOX 49, ALDEN, IA 50006-0049
PO BOX 50, ALDEN, IA 50006-0050
PO BOX 51, ALDEN, IA 50006-0051
PO BOX 52, ALDEN, IA 50006-0052
PO BOX 53, ALDEN, IA 50006-0053
PO BOX 54, ALDEN, IA 50006-0054
PO BOX 55, ALDEN, IA 50006-0055
PO BOX 56, ALDEN, IA 50006-0056
PO BOX 57, ALDEN, IA 50006-0057
PO BOX 58, ALDEN, IA 50006-0058
PO BOX 59, ALDEN, IA 50006-0059
PO BOX 60, ALDEN, IA 50006-0060
PO BOX 61, ALDEN, IA 50006-0061
PO BOX 62, ALDEN, IA 50006-0062
PO BOX 63, ALDEN, IA 50006-0063
PO BOX 64, ALDEN, IA 50006-0064
PO BOX 65, ALDEN, IA 50006-0065
PO BOX 66, ALDEN, IA 50006-0066
PO BOX 67, ALDEN, IA 50006-0067
PO BOX 68, ALDEN, IA 50006-0068
PO BOX 69, ALDEN, IA 50006-0069
PO BOX 70, ALDEN, IA 50006-0070
PO BOX 71, ALDEN, IA 50006-0071
PO BOX 72, ALDEN, IA 50006-0072
PO BOX 73, ALDEN, IA 50006-0073
PO BOX 74, ALDEN, IA 50006-0074
PO BOX 75, ALDEN, IA 50006-0075
PO BOX 76, ALDEN, IA 50006-0076
PO BOX 77, ALDEN, IA 50006-0077
PO BOX 78, ALDEN, IA 50006-0078
PO BOX 79, ALDEN, IA 50006-0079
PO BOX 80, ALDEN, IA 50006-0080
PO BOX 81, ALDEN, IA 50006-0081
PO BOX 82, ALDEN, IA 50006-0082
PO BOX 83, ALDEN, IA 50006-0083
PO BOX 84, ALDEN, IA 50006-0084
PO BOX 85, ALDEN, IA 50006-0085
PO BOX 86, ALDEN, IA 50006-0086
PO BOX 87, ALDEN, IA 50006-0087
PO BOX 88, ALDEN, IA 50006-0088
PO BOX 89, ALDEN, IA 50006-0089
PO BOX 90, ALDEN, IA 50006-0090
PO BOX 91, ALDEN, IA 50006-0091
PO BOX 92, ALDEN, IA 50006-0092
PO BOX 93, ALDEN, IA 50006-0093
PO BOX 94, ALDEN, IA 50006-0094
PO BOX 95, ALDEN, IA 50006-0095
PO BOX 96, ALDEN, IA 50006-0096
PO BOX 97, ALDEN, IA 50006-0097
PO BOX 98, ALDEN, IA 50006-0098
PO BOX 99, ALDEN, IA 50006-0099
PO BOX 100, ALDEN, IA 50006-0100
PO BOX 101, ALDEN, IA 50006-0101
PO BOX 102, ALDEN, IA 50006-0102
PO BOX 103, ALDEN, IA 50006-0103
PO BOX 104, ALDEN, IA 50006-0104
PO BOX 105, ALDEN, IA 50006-0105
PO BOX 106, ALDEN, IA 50006-0106
PO BOX 107, ALDEN, IA 50006-0107
PO BOX 108, ALDEN, IA 50006-0108
PO BOX 109, ALDEN, IA 50006-0109
PO BOX 110, ALDEN, IA 50006-0110
PO BOX 111, ALDEN, IA 50006-0111
PO BOX 112, ALDEN, IA 50006-0112
PO BOX 113, ALDEN, IA 50006-0113
PO BOX 114, ALDEN, IA 50006-0114
PO BOX 115, ALDEN, IA 50006-0115
PO BOX 116, ALDEN, IA 50006-0116
PO BOX 117, ALDEN, IA 50006-0117
PO BOX 118, ALDEN, IA 50006-0118
PO BOX 119, ALDEN, IA 50006-0119
PO BOX 120, ALDEN, IA 50006-0120
PO BOX 121, ALDEN, IA 50006-0121
PO BOX 122, ALDEN, IA 50006-0122
PO BOX 123, ALDEN, IA 50006-0123
PO BOX 124, ALDEN, IA 50006-0124
PO BOX 125, ALDEN, IA 50006-0125
PO BOX 126, ALDEN, IA 50006-0126
PO BOX 127, ALDEN, IA 50006-0127
PO BOX 128, ALDEN, IA 50006-0128
PO BOX 129, ALDEN, IA 50006-0129
PO BOX 130, ALDEN, IA 50006-0130
PO BOX 131, ALDEN, IA 50006-0131
PO BOX 132, ALDEN, IA 50006-0132
PO BOX 133, ALDEN, IA 50006-0133
PO BOX 134, ALDEN, IA 50006-0134
PO BOX 135, ALDEN, IA 50006-0135
PO BOX 136, ALDEN, IA 50006-0136
PO BOX 137, ALDEN, IA 50006-0137
PO BOX 138, ALDEN, IA 50006-0138
PO BOX 139, ALDEN, IA 50006-0139
PO BOX 140, ALDEN, IA 50006-0140
PO BOX 141, ALDEN, IA 50006-0141
PO BOX 142, ALDEN, IA 50006-0142
PO BOX 143, ALDEN, IA 50006-0143
PO BOX 144, ALDEN, IA 50006-0144
PO BOX 145, ALDEN, IA 50006-0145
PO BOX 146, ALDEN, IA 50006-0146
PO BOX 147, ALDEN, IA 50006-0147
PO BOX 148, ALDEN, IA 50006-0148
PO BOX 149, ALDEN, IA 50006-0149
PO BOX 150, ALDEN, IA 50006-0150
PO BOX 151, ALDEN, IA 50006-0151
PO BOX 152, ALDEN, IA 50006-0152
PO BOX 153, ALDEN, IA 50006-0153
PO BOX 154, ALDEN, IA 50006-0154
PO BOX 155, ALDEN, IA 50006-0155
PO BOX 156, ALDEN, IA 50006-0156
PO BOX 157, ALDEN, IA 50006-0157
PO BOX 158, ALDEN, IA 50006-0158
PO BOX 159, ALDEN, IA 50006-0159
PO BOX 160, ALDEN, IA 50006-0160
PO BOX 161, ALDEN, IA 50006-0161
PO BOX 162, ALDEN, IA 50006-0162
PO BOX 163, ALDEN, IA 50006-0163
PO BOX 164, ALDEN, IA 50006-0164
PO BOX 165, ALDEN, IA 50006-0165
PO BOX 166, ALDEN, IA 50006-0166
PO BOX 167, ALDEN, IA 50006-0167
PO BOX 168, ALDEN, IA 50006-0168
PO BOX 169, ALDEN, IA 50006-0169
PO BOX 170, ALDEN, IA 50006-0170
PO BOX 171, ALDEN, IA 50006-0171
PO BOX 172, ALDEN, IA 50006-0172
PO BOX 173, ALDEN, IA 50006-0173
PO BOX 174, ALDEN, IA 50006-0174
PO BOX 175, ALDEN, IA 50006-0175
PO BOX 176, ALDEN, IA 50006-0176
PO BOX 177, ALDEN, IA 50006-0177
PO BOX 178, ALDEN, IA 50006-0178
PO BOX 179, ALDEN, IA 50006-0179
PO BOX 180, ALDEN, IA 50006-0180
PO BOX 181, ALDEN, IA 50006-0181
PO BOX 182, ALDEN, IA 50006-0182
PO BOX 183, ALDEN, IA 50006-0183
PO BOX 184, ALDEN, IA 50006-0184
PO BOX 185, ALDEN, IA 50006-0185
PO BOX 186, ALDEN, IA 50006-0186
PO BOX 187, ALDEN, IA 50006-0187
PO BOX 188, ALDEN, IA 50006-0188
PO BOX 189, ALDEN, IA 50006-0189
PO BOX 190, ALDEN, IA 50006-0190
PO BOX 191, ALDEN, IA 50006-0191
PO BOX 192, ALDEN, IA 50006-0192
PO BOX 193, ALDEN, IA 50006-0193
PO BOX 194, ALDEN, IA 50006-0194
PO BOX 195, ALDEN, IA 50006-0195
PO BOX 196, ALDEN, IA 50006-0196
PO BOX 197, ALDEN, IA 50006-0197
PO BOX 198, ALDEN, IA 50006-0198
PO BOX 199, ALDEN, IA 50006-0199
PO BOX 200, ALDEN, IA 50006-0200
PO BOX 201, ALDEN, IA 50006-0201
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