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, LAKE MILLS, IA 50450-0001
PO BOX 2, LAKE MILLS, IA 50450-0002
PO BOX 3, LAKE MILLS, IA 50450-0003
PO BOX 4, LAKE MILLS, IA 50450-0004
PO BOX 5, LAKE MILLS, IA 50450-0005
PO BOX 6, LAKE MILLS, IA 50450-0006
PO BOX 7, LAKE MILLS, IA 50450-0007
PO BOX 8, LAKE MILLS, IA 50450-0008
PO BOX 9, LAKE MILLS, IA 50450-0009
PO BOX 10, LAKE MILLS, IA 50450-0010
PO BOX 11, LAKE MILLS, IA 50450-0011
PO BOX 12, LAKE MILLS, IA 50450-0012
PO BOX 13, LAKE MILLS, IA 50450-0013
PO BOX 14, LAKE MILLS, IA 50450-0014
PO BOX 15, LAKE MILLS, IA 50450-0015
PO BOX 16, LAKE MILLS, IA 50450-0016
PO BOX 17, LAKE MILLS, IA 50450-0017
PO BOX 18, LAKE MILLS, IA 50450-0018
PO BOX 19, LAKE MILLS, IA 50450-0019
PO BOX 20, LAKE MILLS, IA 50450-0020
PO BOX 21, LAKE MILLS, IA 50450-0021
PO BOX 22, LAKE MILLS, IA 50450-0022
PO BOX 23, LAKE MILLS, IA 50450-0023
PO BOX 24, LAKE MILLS, IA 50450-0024
PO BOX 25, LAKE MILLS, IA 50450-0025
PO BOX 26, LAKE MILLS, IA 50450-0026
PO BOX 27, LAKE MILLS, IA 50450-0027
PO BOX 28, LAKE MILLS, IA 50450-0028
PO BOX 29, LAKE MILLS, IA 50450-0029
PO BOX 30, LAKE MILLS, IA 50450-0030
PO BOX 31, LAKE MILLS, IA 50450-0031
PO BOX 32, LAKE MILLS, IA 50450-0032
PO BOX 33, LAKE MILLS, IA 50450-0033
PO BOX 34, LAKE MILLS, IA 50450-0034
PO BOX 35, LAKE MILLS, IA 50450-0035
PO BOX 36, LAKE MILLS, IA 50450-0036
PO BOX 37, LAKE MILLS, IA 50450-0037
PO BOX 38, LAKE MILLS, IA 50450-0038
PO BOX 39, LAKE MILLS, IA 50450-0039
PO BOX 40, LAKE MILLS, IA 50450-0040
PO BOX 41, LAKE MILLS, IA 50450-0041
PO BOX 42, LAKE MILLS, IA 50450-0042
PO BOX 43, LAKE MILLS, IA 50450-0043
PO BOX 44, LAKE MILLS, IA 50450-0044
PO BOX 45, LAKE MILLS, IA 50450-0045
PO BOX 46, LAKE MILLS, IA 50450-0046
PO BOX 47, LAKE MILLS, IA 50450-0047
PO BOX 48, LAKE MILLS, IA 50450-0048
PO BOX 49, LAKE MILLS, IA 50450-0049
PO BOX 50, LAKE MILLS, IA 50450-0050
PO BOX 51, LAKE MILLS, IA 50450-0051
PO BOX 52, LAKE MILLS, IA 50450-0052
PO BOX 53, LAKE MILLS, IA 50450-0053
PO BOX 54, LAKE MILLS, IA 50450-0054
PO BOX 55, LAKE MILLS, IA 50450-0055
PO BOX 56, LAKE MILLS, IA 50450-0056
PO BOX 57, LAKE MILLS, IA 50450-0057
PO BOX 58, LAKE MILLS, IA 50450-0058
PO BOX 59, LAKE MILLS, IA 50450-0059
PO BOX 60, LAKE MILLS, IA 50450-0060
PO BOX 61, LAKE MILLS, IA 50450-0061
PO BOX 62, LAKE MILLS, IA 50450-0062
PO BOX 63, LAKE MILLS, IA 50450-0063
PO BOX 64, LAKE MILLS, IA 50450-0064
PO BOX 65, LAKE MILLS, IA 50450-0065
PO BOX 66, LAKE MILLS, IA 50450-0066
PO BOX 67, LAKE MILLS, IA 50450-0067
PO BOX 68, LAKE MILLS, IA 50450-0068
PO BOX 69, LAKE MILLS, IA 50450-0069
PO BOX 70, LAKE MILLS, IA 50450-0070
PO BOX 71, LAKE MILLS, IA 50450-0071
PO BOX 72, LAKE MILLS, IA 50450-0072
PO BOX 73, LAKE MILLS, IA 50450-0073
PO BOX 74, LAKE MILLS, IA 50450-0074
PO BOX 75, LAKE MILLS, IA 50450-0075
PO BOX 76, LAKE MILLS, IA 50450-0076
PO BOX 77, LAKE MILLS, IA 50450-0077
PO BOX 78, LAKE MILLS, IA 50450-0078
PO BOX 79, LAKE MILLS, IA 50450-0079
PO BOX 80, LAKE MILLS, IA 50450-0080
PO BOX 81, LAKE MILLS, IA 50450-0081
PO BOX 82, LAKE MILLS, IA 50450-0082
PO BOX 83, LAKE MILLS, IA 50450-0083
PO BOX 84, LAKE MILLS, IA 50450-0084
PO BOX 85, LAKE MILLS, IA 50450-0085
PO BOX 86, LAKE MILLS, IA 50450-0086
PO BOX 87, LAKE MILLS, IA 50450-0087
PO BOX 88, LAKE MILLS, IA 50450-0088
PO BOX 89, LAKE MILLS, IA 50450-0089
PO BOX 90, LAKE MILLS, IA 50450-0090
PO BOX 91, LAKE MILLS, IA 50450-0091
PO BOX 92, LAKE MILLS, IA 50450-0092
PO BOX 93, LAKE MILLS, IA 50450-0093
PO BOX 94, LAKE MILLS, IA 50450-0094
PO BOX 95, LAKE MILLS, IA 50450-0095
PO BOX 96, LAKE MILLS, IA 50450-0096
PO BOX 97, LAKE MILLS, IA 50450-0097
PO BOX 98, LAKE MILLS, IA 50450-0098
PO BOX 99, LAKE MILLS, IA 50450-0099
PO BOX 100, LAKE MILLS, IA 50450-0100
PO BOX 101, LAKE MILLS, IA 50450-0101
PO BOX 102, LAKE MILLS, IA 50450-0102
PO BOX 103, LAKE MILLS, IA 50450-0103
PO BOX 104, LAKE MILLS, IA 50450-0104
PO BOX 105, LAKE MILLS, IA 50450-0105
PO BOX 106, LAKE MILLS, IA 50450-0106
PO BOX 107, LAKE MILLS, IA 50450-0107
PO BOX 108, LAKE MILLS, IA 50450-0108
PO BOX 109, LAKE MILLS, IA 50450-0109
PO BOX 110, LAKE MILLS, IA 50450-0110
PO BOX 111, LAKE MILLS, IA 50450-0111
PO BOX 112, LAKE MILLS, IA 50450-0112
PO BOX 113, LAKE MILLS, IA 50450-0113
PO BOX 114, LAKE MILLS, IA 50450-0114
PO BOX 115, LAKE MILLS, IA 50450-0115
PO BOX 116, LAKE MILLS, IA 50450-0116
PO BOX 117, LAKE MILLS, IA 50450-0117
PO BOX 118, LAKE MILLS, IA 50450-0118
PO BOX 119, LAKE MILLS, IA 50450-0119
PO BOX 120, LAKE MILLS, IA 50450-0120
PO BOX 121, LAKE MILLS, IA 50450-0121
PO BOX 122, LAKE MILLS, IA 50450-0122
PO BOX 123, LAKE MILLS, IA 50450-0123
PO BOX 124, LAKE MILLS, IA 50450-0124
PO BOX 125, LAKE MILLS, IA 50450-0125
PO BOX 126, LAKE MILLS, IA 50450-0126
PO BOX 127, LAKE MILLS, IA 50450-0127
PO BOX 128, LAKE MILLS, IA 50450-0128
PO BOX 129, LAKE MILLS, IA 50450-0129
PO BOX 130, LAKE MILLS, IA 50450-0130
PO BOX 131, LAKE MILLS, IA 50450-0131
PO BOX 132, LAKE MILLS, IA 50450-0132
PO BOX 133, LAKE MILLS, IA 50450-0133
PO BOX 134, LAKE MILLS, IA 50450-0134
PO BOX 135, LAKE MILLS, IA 50450-0135
PO BOX 136, LAKE MILLS, IA 50450-0136
PO BOX 137, LAKE MILLS, IA 50450-0137
PO BOX 138, LAKE MILLS, IA 50450-0138
PO BOX 139, LAKE MILLS, IA 50450-0139
PO BOX 140, LAKE MILLS, IA 50450-0140
PO BOX 141, LAKE MILLS, IA 50450-0141
PO BOX 142, LAKE MILLS, IA 50450-0142
PO BOX 143, LAKE MILLS, IA 50450-0143
PO BOX 144, LAKE MILLS, IA 50450-0144
PO BOX 145, LAKE MILLS, IA 50450-0145
PO BOX 146, LAKE MILLS, IA 50450-0146
PO BOX 147, LAKE MILLS, IA 50450-0147
PO BOX 148, LAKE MILLS, IA 50450-0148
PO BOX 149, LAKE MILLS, IA 50450-0149
PO BOX 150, LAKE MILLS, IA 50450-0150
PO BOX 151, LAKE MILLS, IA 50450-0151
PO BOX 152, LAKE MILLS, IA 50450-0152
PO BOX 153, LAKE MILLS, IA 50450-0153
PO BOX 154, LAKE MILLS, IA 50450-0154
PO BOX 155, LAKE MILLS, IA 50450-0155
PO BOX 156, LAKE MILLS, IA 50450-0156
PO BOX 157, LAKE MILLS, IA 50450-0157
PO BOX 158, LAKE MILLS, IA 50450-0158
PO BOX 159, LAKE MILLS, IA 50450-0159
PO BOX 160, LAKE MILLS, IA 50450-0160
PO BOX 161, LAKE MILLS, IA 50450-0161
PO BOX 162, LAKE MILLS, IA 50450-0162
PO BOX 163, LAKE MILLS, IA 50450-0163
PO BOX 164, LAKE MILLS, IA 50450-0164
PO BOX 165, LAKE MILLS, IA 50450-0165
PO BOX 166, LAKE MILLS, IA 50450-0166
PO BOX 167, LAKE MILLS, IA 50450-0167
PO BOX 168, LAKE MILLS, IA 50450-0168
PO BOX 169, LAKE MILLS, IA 50450-0169
PO BOX 170, LAKE MILLS, IA 50450-0170
PO BOX 171, LAKE MILLS, IA 50450-0171
PO BOX 172, LAKE MILLS, IA 50450-0172
PO BOX 173, LAKE MILLS, IA 50450-0173
PO BOX 174, LAKE MILLS, IA 50450-0174
PO BOX 175, LAKE MILLS, IA 50450-0175
PO BOX 176, LAKE MILLS, IA 50450-0176
PO BOX 177, LAKE MILLS, IA 50450-0177
PO BOX 178, LAKE MILLS, IA 50450-0178
PO BOX 179, LAKE MILLS, IA 50450-0179
PO BOX 180, LAKE MILLS, IA 50450-0180
PO BOX 181, LAKE MILLS, IA 50450-0181
PO BOX 182, LAKE MILLS, IA 50450-0182
PO BOX 183, LAKE MILLS, IA 50450-0183
PO BOX 184, LAKE MILLS, IA 50450-0184
PO BOX 185, LAKE MILLS, IA 50450-0185
PO BOX 186, LAKE MILLS, IA 50450-0186
PO BOX 187, LAKE MILLS, IA 50450-0187
PO BOX 188, LAKE MILLS, IA 50450-0188
PO BOX 189, LAKE MILLS, IA 50450-0189
PO BOX 190, LAKE MILLS, IA 50450-0190
PO BOX 191, LAKE MILLS, IA 50450-0191
PO BOX 192, LAKE MILLS, IA 50450-0192
PO BOX 193, LAKE MILLS, IA 50450-0193
PO BOX 194, LAKE MILLS, IA 50450-0194
PO BOX 195, LAKE MILLS, IA 50450-0195
PO BOX 196, LAKE MILLS, IA 50450-0196
PO BOX 197, LAKE MILLS, IA 50450-0197
PO BOX 198, LAKE MILLS, IA 50450-0198
PO BOX 199, LAKE MILLS, IA 50450-0199
PO BOX 200, LAKE MILLS, IA 50450-0200
PO BOX 201, LAKE MILLS, IA 50450-0201
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