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, DAYTON, IA 50530-0001
PO BOX 2, DAYTON, IA 50530-0002
PO BOX 3, DAYTON, IA 50530-0003
PO BOX 4, DAYTON, IA 50530-0004
PO BOX 5, DAYTON, IA 50530-0005
PO BOX 6, DAYTON, IA 50530-0006
PO BOX 7, DAYTON, IA 50530-0007
PO BOX 8, DAYTON, IA 50530-0008
PO BOX 9, DAYTON, IA 50530-0009
PO BOX 10, DAYTON, IA 50530-0010
PO BOX 11, DAYTON, IA 50530-0011
PO BOX 12, DAYTON, IA 50530-0012
PO BOX 13, DAYTON, IA 50530-0013
PO BOX 14, DAYTON, IA 50530-0014
PO BOX 15, DAYTON, IA 50530-0015
PO BOX 16, DAYTON, IA 50530-0016
PO BOX 17, DAYTON, IA 50530-0017
PO BOX 18, DAYTON, IA 50530-0018
PO BOX 19, DAYTON, IA 50530-0019
PO BOX 20, DAYTON, IA 50530-0020
PO BOX 21, DAYTON, IA 50530-0021
PO BOX 22, DAYTON, IA 50530-0022
PO BOX 23, DAYTON, IA 50530-0023
PO BOX 24, DAYTON, IA 50530-0024
PO BOX 25, DAYTON, IA 50530-0025
PO BOX 26, DAYTON, IA 50530-0026
PO BOX 27, DAYTON, IA 50530-0027
PO BOX 28, DAYTON, IA 50530-0028
PO BOX 29, DAYTON, IA 50530-0029
PO BOX 30, DAYTON, IA 50530-0030
PO BOX 31, DAYTON, IA 50530-0031
PO BOX 32, DAYTON, IA 50530-0032
PO BOX 33, DAYTON, IA 50530-0033
PO BOX 34, DAYTON, IA 50530-0034
PO BOX 35, DAYTON, IA 50530-0035
PO BOX 36, DAYTON, IA 50530-0036
PO BOX 37, DAYTON, IA 50530-0037
PO BOX 38, DAYTON, IA 50530-0038
PO BOX 39, DAYTON, IA 50530-0039
PO BOX 40, DAYTON, IA 50530-0040
PO BOX 41, DAYTON, IA 50530-0041
PO BOX 42, DAYTON, IA 50530-0042
PO BOX 43, DAYTON, IA 50530-0043
PO BOX 44, DAYTON, IA 50530-0044
PO BOX 45, DAYTON, IA 50530-0045
PO BOX 46, DAYTON, IA 50530-0046
PO BOX 47, DAYTON, IA 50530-0047
PO BOX 48, DAYTON, IA 50530-0048
PO BOX 49, DAYTON, IA 50530-0049
PO BOX 50, DAYTON, IA 50530-0050
PO BOX 51, DAYTON, IA 50530-0051
PO BOX 52, DAYTON, IA 50530-0052
PO BOX 53, DAYTON, IA 50530-0053
PO BOX 54, DAYTON, IA 50530-0054
PO BOX 55, DAYTON, IA 50530-0055
PO BOX 56, DAYTON, IA 50530-0056
PO BOX 57, DAYTON, IA 50530-0057
PO BOX 58, DAYTON, IA 50530-0058
PO BOX 59, DAYTON, IA 50530-0059
PO BOX 60, DAYTON, IA 50530-0060
PO BOX 61, DAYTON, IA 50530-0061
PO BOX 62, DAYTON, IA 50530-0062
PO BOX 63, DAYTON, IA 50530-0063
PO BOX 64, DAYTON, IA 50530-0064
PO BOX 65, DAYTON, IA 50530-0065
PO BOX 66, DAYTON, IA 50530-0066
PO BOX 67, DAYTON, IA 50530-0067
PO BOX 68, DAYTON, IA 50530-0068
PO BOX 69, DAYTON, IA 50530-0069
PO BOX 70, DAYTON, IA 50530-0070
PO BOX 71, DAYTON, IA 50530-0071
PO BOX 72, DAYTON, IA 50530-0072
PO BOX 73, DAYTON, IA 50530-0073
PO BOX 74, DAYTON, IA 50530-0074
PO BOX 75, DAYTON, IA 50530-0075
PO BOX 76, DAYTON, IA 50530-0076
PO BOX 77, DAYTON, IA 50530-0077
PO BOX 78, DAYTON, IA 50530-0078
PO BOX 79, DAYTON, IA 50530-0079
PO BOX 80, DAYTON, IA 50530-0080
PO BOX 81, DAYTON, IA 50530-0081
PO BOX 82, DAYTON, IA 50530-0082
PO BOX 83, DAYTON, IA 50530-0083
PO BOX 84, DAYTON, IA 50530-0084
PO BOX 85, DAYTON, IA 50530-0085
PO BOX 86, DAYTON, IA 50530-0086
PO BOX 87, DAYTON, IA 50530-0087
PO BOX 88, DAYTON, IA 50530-0088
PO BOX 89, DAYTON, IA 50530-0089
PO BOX 90, DAYTON, IA 50530-0090
PO BOX 91, DAYTON, IA 50530-0091
PO BOX 92, DAYTON, IA 50530-0092
PO BOX 93, DAYTON, IA 50530-0093
PO BOX 94, DAYTON, IA 50530-0094
PO BOX 95, DAYTON, IA 50530-0095
PO BOX 96, DAYTON, IA 50530-0096
PO BOX 97, DAYTON, IA 50530-0097
PO BOX 98, DAYTON, IA 50530-0098
PO BOX 99, DAYTON, IA 50530-0099
PO BOX 100, DAYTON, IA 50530-0100
PO BOX 101, DAYTON, IA 50530-0101
PO BOX 102, DAYTON, IA 50530-0102
PO BOX 103, DAYTON, IA 50530-0103
PO BOX 104, DAYTON, IA 50530-0104
PO BOX 105, DAYTON, IA 50530-0105
PO BOX 106, DAYTON, IA 50530-0106
PO BOX 107, DAYTON, IA 50530-0107
PO BOX 108, DAYTON, IA 50530-0108
PO BOX 109, DAYTON, IA 50530-0109
PO BOX 110, DAYTON, IA 50530-0110
PO BOX 111, DAYTON, IA 50530-0111
PO BOX 112, DAYTON, IA 50530-0112
PO BOX 113, DAYTON, IA 50530-0113
PO BOX 114, DAYTON, IA 50530-0114
PO BOX 115, DAYTON, IA 50530-0115
PO BOX 116, DAYTON, IA 50530-0116
PO BOX 117, DAYTON, IA 50530-0117
PO BOX 118, DAYTON, IA 50530-0118
PO BOX 119, DAYTON, IA 50530-0119
PO BOX 120, DAYTON, IA 50530-0120
PO BOX 121, DAYTON, IA 50530-0121
PO BOX 122, DAYTON, IA 50530-0122
PO BOX 123, DAYTON, IA 50530-0123
PO BOX 124, DAYTON, IA 50530-0124
PO BOX 125, DAYTON, IA 50530-0125
PO BOX 126, DAYTON, IA 50530-0126
PO BOX 127, DAYTON, IA 50530-0127
PO BOX 128, DAYTON, IA 50530-0128
PO BOX 129, DAYTON, IA 50530-0129
PO BOX 130, DAYTON, IA 50530-0130
PO BOX 131, DAYTON, IA 50530-0131
PO BOX 132, DAYTON, IA 50530-0132
PO BOX 133, DAYTON, IA 50530-0133
PO BOX 134, DAYTON, IA 50530-0134
PO BOX 135, DAYTON, IA 50530-0135
PO BOX 136, DAYTON, IA 50530-0136
PO BOX 137, DAYTON, IA 50530-0137
PO BOX 138, DAYTON, IA 50530-0138
PO BOX 139, DAYTON, IA 50530-0139
PO BOX 140, DAYTON, IA 50530-0140
PO BOX 141, DAYTON, IA 50530-0141
PO BOX 142, DAYTON, IA 50530-0142
PO BOX 143, DAYTON, IA 50530-0143
PO BOX 144, DAYTON, IA 50530-0144
PO BOX 145, DAYTON, IA 50530-0145
PO BOX 146, DAYTON, IA 50530-0146
PO BOX 147, DAYTON, IA 50530-0147
PO BOX 148, DAYTON, IA 50530-0148
PO BOX 149, DAYTON, IA 50530-0149
PO BOX 150, DAYTON, IA 50530-0150
PO BOX 151, DAYTON, IA 50530-0151
PO BOX 152, DAYTON, IA 50530-0152
PO BOX 153, DAYTON, IA 50530-0153
PO BOX 154, DAYTON, IA 50530-0154
PO BOX 155, DAYTON, IA 50530-0155
PO BOX 156, DAYTON, IA 50530-0156
PO BOX 157, DAYTON, IA 50530-0157
PO BOX 158, DAYTON, IA 50530-0158
PO BOX 159, DAYTON, IA 50530-0159
PO BOX 160, DAYTON, IA 50530-0160
PO BOX 161, DAYTON, IA 50530-0161
PO BOX 162, DAYTON, IA 50530-0162
PO BOX 163, DAYTON, IA 50530-0163
PO BOX 164, DAYTON, IA 50530-0164
PO BOX 165, DAYTON, IA 50530-0165
PO BOX 166, DAYTON, IA 50530-0166
PO BOX 167, DAYTON, IA 50530-0167
PO BOX 168, DAYTON, IA 50530-0168
PO BOX 169, DAYTON, IA 50530-0169
PO BOX 170, DAYTON, IA 50530-0170
PO BOX 171, DAYTON, IA 50530-0171
PO BOX 172, DAYTON, IA 50530-0172
PO BOX 173, DAYTON, IA 50530-0173
PO BOX 174, DAYTON, IA 50530-0174
PO BOX 175, DAYTON, IA 50530-0175
PO BOX 176, DAYTON, IA 50530-0176
PO BOX 177, DAYTON, IA 50530-0177
PO BOX 178, DAYTON, IA 50530-0178
PO BOX 179, DAYTON, IA 50530-0179
PO BOX 180, DAYTON, IA 50530-0180
PO BOX 181, DAYTON, IA 50530-0181
PO BOX 182, DAYTON, IA 50530-0182
PO BOX 183, DAYTON, IA 50530-0183
PO BOX 184, DAYTON, IA 50530-0184
PO BOX 185, DAYTON, IA 50530-0185
PO BOX 186, DAYTON, IA 50530-0186
PO BOX 187, DAYTON, IA 50530-0187
PO BOX 188, DAYTON, IA 50530-0188
PO BOX 189, DAYTON, IA 50530-0189
PO BOX 190, DAYTON, IA 50530-0190
PO BOX 191, DAYTON, IA 50530-0191
PO BOX 192, DAYTON, IA 50530-0192
PO BOX 193, DAYTON, IA 50530-0193
PO BOX 194, DAYTON, IA 50530-0194
PO BOX 195, DAYTON, IA 50530-0195
PO BOX 196, DAYTON, IA 50530-0196
PO BOX 197, DAYTON, IA 50530-0197
PO BOX 198, DAYTON, IA 50530-0198
PO BOX 199, DAYTON, IA 50530-0199
PO BOX 200, DAYTON, IA 50530-0200
PO BOX 201, DAYTON, IA 50530-0201
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