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, MONMOUTH, IA 52309-0001
PO BOX 2, MONMOUTH, IA 52309-0002
PO BOX 3, MONMOUTH, IA 52309-0003
PO BOX 4, MONMOUTH, IA 52309-0004
PO BOX 5, MONMOUTH, IA 52309-0005
PO BOX 6, MONMOUTH, IA 52309-0006
PO BOX 7, MONMOUTH, IA 52309-0007
PO BOX 8, MONMOUTH, IA 52309-0008
PO BOX 9, MONMOUTH, IA 52309-0009
PO BOX 10, MONMOUTH, IA 52309-0010
PO BOX 11, MONMOUTH, IA 52309-0011
PO BOX 12, MONMOUTH, IA 52309-0012
PO BOX 13, MONMOUTH, IA 52309-0013
PO BOX 14, MONMOUTH, IA 52309-0014
PO BOX 15, MONMOUTH, IA 52309-0015
PO BOX 16, MONMOUTH, IA 52309-0016
PO BOX 17, MONMOUTH, IA 52309-0017
PO BOX 18, MONMOUTH, IA 52309-0018
PO BOX 19, MONMOUTH, IA 52309-0019
PO BOX 20, MONMOUTH, IA 52309-0020
PO BOX 21, MONMOUTH, IA 52309-0021
PO BOX 22, MONMOUTH, IA 52309-0022
PO BOX 23, MONMOUTH, IA 52309-0023
PO BOX 24, MONMOUTH, IA 52309-0024
PO BOX 25, MONMOUTH, IA 52309-0025
PO BOX 26, MONMOUTH, IA 52309-0026
PO BOX 27, MONMOUTH, IA 52309-0027
PO BOX 28, MONMOUTH, IA 52309-0028
PO BOX 29, MONMOUTH, IA 52309-0029
PO BOX 30, MONMOUTH, IA 52309-0030
PO BOX 31, MONMOUTH, IA 52309-0031
PO BOX 32, MONMOUTH, IA 52309-0032
PO BOX 33, MONMOUTH, IA 52309-0033
PO BOX 34, MONMOUTH, IA 52309-0034
PO BOX 35, MONMOUTH, IA 52309-0035
PO BOX 36, MONMOUTH, IA 52309-0036
PO BOX 37, MONMOUTH, IA 52309-0037
PO BOX 38, MONMOUTH, IA 52309-0038
PO BOX 39, MONMOUTH, IA 52309-0039
PO BOX 40, MONMOUTH, IA 52309-0040
PO BOX 41, MONMOUTH, IA 52309-0041
PO BOX 42, MONMOUTH, IA 52309-0042
PO BOX 43, MONMOUTH, IA 52309-0043
PO BOX 44, MONMOUTH, IA 52309-0044
PO BOX 45, MONMOUTH, IA 52309-0045
PO BOX 46, MONMOUTH, IA 52309-0046
PO BOX 47, MONMOUTH, IA 52309-0047
PO BOX 48, MONMOUTH, IA 52309-0048
PO BOX 49, MONMOUTH, IA 52309-0049
PO BOX 50, MONMOUTH, IA 52309-0050
PO BOX 51, MONMOUTH, IA 52309-0051
PO BOX 52, MONMOUTH, IA 52309-0052
PO BOX 53, MONMOUTH, IA 52309-0053
PO BOX 54, MONMOUTH, IA 52309-0054
PO BOX 55, MONMOUTH, IA 52309-0055
PO BOX 56, MONMOUTH, IA 52309-0056
PO BOX 57, MONMOUTH, IA 52309-0057
PO BOX 58, MONMOUTH, IA 52309-0058
PO BOX 59, MONMOUTH, IA 52309-0059
PO BOX 60, MONMOUTH, IA 52309-0060
PO BOX 61, MONMOUTH, IA 52309-0061
PO BOX 62, MONMOUTH, IA 52309-0062
PO BOX 63, MONMOUTH, IA 52309-0063
PO BOX 64, MONMOUTH, IA 52309-0064
PO BOX 65, MONMOUTH, IA 52309-0065
PO BOX 66, MONMOUTH, IA 52309-0066
PO BOX 67, MONMOUTH, IA 52309-0067
PO BOX 68, MONMOUTH, IA 52309-0068
PO BOX 69, MONMOUTH, IA 52309-0069
PO BOX 70, MONMOUTH, IA 52309-0070
PO BOX 71, MONMOUTH, IA 52309-0071
PO BOX 72, MONMOUTH, IA 52309-0072
PO BOX 73, MONMOUTH, IA 52309-0073
PO BOX 74, MONMOUTH, IA 52309-0074
PO BOX 75, MONMOUTH, IA 52309-0075
PO BOX 76, MONMOUTH, IA 52309-0076
PO BOX 77, MONMOUTH, IA 52309-0077
PO BOX 78, MONMOUTH, IA 52309-0078
PO BOX 79, MONMOUTH, IA 52309-0079
PO BOX 80, MONMOUTH, IA 52309-0080
PO BOX 81, MONMOUTH, IA 52309-0081
PO BOX 82, MONMOUTH, IA 52309-0082
PO BOX 83, MONMOUTH, IA 52309-0083
PO BOX 84, MONMOUTH, IA 52309-0084
PO BOX 85, MONMOUTH, IA 52309-0085
PO BOX 86, MONMOUTH, IA 52309-0086
PO BOX 87, MONMOUTH, IA 52309-0087
PO BOX 88, MONMOUTH, IA 52309-0088
PO BOX 89, MONMOUTH, IA 52309-0089
PO BOX 90, MONMOUTH, IA 52309-0090
PO BOX 91, MONMOUTH, IA 52309-0091
PO BOX 92, MONMOUTH, IA 52309-0092
PO BOX 93, MONMOUTH, IA 52309-0093
PO BOX 94, MONMOUTH, IA 52309-0094
PO BOX 95, MONMOUTH, IA 52309-0095
PO BOX 96, MONMOUTH, IA 52309-0096
PO BOX 97, MONMOUTH, IA 52309-0097
PO BOX 98, MONMOUTH, IA 52309-0098
PO BOX 99, MONMOUTH, IA 52309-0099
PO BOX 100, MONMOUTH, IA 52309-0100
PO BOX 101, MONMOUTH, IA 52309-0101
PO BOX 102, MONMOUTH, IA 52309-0102
PO BOX 103, MONMOUTH, IA 52309-0103
PO BOX 104, MONMOUTH, IA 52309-0104
PO BOX 105, MONMOUTH, IA 52309-0105
PO BOX 106, MONMOUTH, IA 52309-0106
PO BOX 107, MONMOUTH, IA 52309-0107
PO BOX 108, MONMOUTH, IA 52309-0108
PO BOX 109, MONMOUTH, IA 52309-0109
PO BOX 110, MONMOUTH, IA 52309-0110
PO BOX 111, MONMOUTH, IA 52309-0111
PO BOX 112, MONMOUTH, IA 52309-0112
PO BOX 113, MONMOUTH, IA 52309-0113
PO BOX 114, MONMOUTH, IA 52309-0114
PO BOX 115, MONMOUTH, IA 52309-0115
PO BOX 116, MONMOUTH, IA 52309-0116
PO BOX 117, MONMOUTH, IA 52309-0117
PO BOX 118, MONMOUTH, IA 52309-0118
PO BOX 119, MONMOUTH, IA 52309-0119
PO BOX 120, MONMOUTH, IA 52309-0120
PO BOX 121, MONMOUTH, IA 52309-0121
PO BOX 122, MONMOUTH, IA 52309-0122
PO BOX 123, MONMOUTH, IA 52309-0123
PO BOX 124, MONMOUTH, IA 52309-0124
PO BOX 125, MONMOUTH, IA 52309-0125
PO BOX 126, MONMOUTH, IA 52309-0126
PO BOX 127, MONMOUTH, IA 52309-0127
PO BOX 128, MONMOUTH, IA 52309-0128
PO BOX 129, MONMOUTH, IA 52309-0129
PO BOX 130, MONMOUTH, IA 52309-0130
PO BOX 131, MONMOUTH, IA 52309-0131
PO BOX 132, MONMOUTH, IA 52309-0132
PO BOX 133, MONMOUTH, IA 52309-0133
PO BOX 134, MONMOUTH, IA 52309-0134
PO BOX 135, MONMOUTH, IA 52309-0135
PO BOX 136, MONMOUTH, IA 52309-0136
PO BOX 137, MONMOUTH, IA 52309-0137
PO BOX 138, MONMOUTH, IA 52309-0138
PO BOX 139, MONMOUTH, IA 52309-0139
PO BOX 140, MONMOUTH, IA 52309-0140
PO BOX 141, MONMOUTH, IA 52309-0141
PO BOX 142, MONMOUTH, IA 52309-0142
PO BOX 143, MONMOUTH, IA 52309-0143
PO BOX 144, MONMOUTH, IA 52309-0144
PO BOX 145, MONMOUTH, IA 52309-0145
PO BOX 146, MONMOUTH, IA 52309-0146
PO BOX 147, MONMOUTH, IA 52309-0147
PO BOX 148, MONMOUTH, IA 52309-0148
PO BOX 149, MONMOUTH, IA 52309-0149
PO BOX 150, MONMOUTH, IA 52309-0150
PO BOX 151, MONMOUTH, IA 52309-0151
PO BOX 152, MONMOUTH, IA 52309-0152
PO BOX 153, MONMOUTH, IA 52309-0153
PO BOX 154, MONMOUTH, IA 52309-0154
PO BOX 155, MONMOUTH, IA 52309-0155
PO BOX 156, MONMOUTH, IA 52309-0156
PO BOX 157, MONMOUTH, IA 52309-0157
PO BOX 158, MONMOUTH, IA 52309-0158
PO BOX 159, MONMOUTH, IA 52309-0159
PO BOX 160, MONMOUTH, IA 52309-0160
PO BOX 161, MONMOUTH, IA 52309-0161
PO BOX 162, MONMOUTH, IA 52309-0162
PO BOX 163, MONMOUTH, IA 52309-0163
PO BOX 164, MONMOUTH, IA 52309-0164
PO BOX 165, MONMOUTH, IA 52309-0165
PO BOX 166, MONMOUTH, IA 52309-0166
PO BOX 167, MONMOUTH, IA 52309-0167
PO BOX 168, MONMOUTH, IA 52309-0168
PO BOX 169, MONMOUTH, IA 52309-0169
PO BOX 170, MONMOUTH, IA 52309-0170
PO BOX 171, MONMOUTH, IA 52309-0171
PO BOX 172, MONMOUTH, IA 52309-0172
PO BOX 173, MONMOUTH, IA 52309-0173
PO BOX 174, MONMOUTH, IA 52309-0174
PO BOX 175, MONMOUTH, IA 52309-0175
PO BOX 176, MONMOUTH, IA 52309-0176
PO BOX 177, MONMOUTH, IA 52309-0177
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