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, LA PORTE CITY, IA 50651-0001
PO BOX 2, LA PORTE CITY, IA 50651-0002
PO BOX 3, LA PORTE CITY, IA 50651-0003
PO BOX 4, LA PORTE CITY, IA 50651-0004
PO BOX 5, LA PORTE CITY, IA 50651-0005
PO BOX 6, LA PORTE CITY, IA 50651-0006
PO BOX 7, LA PORTE CITY, IA 50651-0007
PO BOX 8, LA PORTE CITY, IA 50651-0008
PO BOX 9, LA PORTE CITY, IA 50651-0009
PO BOX 10, LA PORTE CITY, IA 50651-0010
PO BOX 11, LA PORTE CITY, IA 50651-0011
PO BOX 12, LA PORTE CITY, IA 50651-0012
PO BOX 13, LA PORTE CITY, IA 50651-0013
PO BOX 14, LA PORTE CITY, IA 50651-0014
PO BOX 15, LA PORTE CITY, IA 50651-0015
PO BOX 16, LA PORTE CITY, IA 50651-0016
PO BOX 17, LA PORTE CITY, IA 50651-0017
PO BOX 18, LA PORTE CITY, IA 50651-0018
PO BOX 19, LA PORTE CITY, IA 50651-0019
PO BOX 20, LA PORTE CITY, IA 50651-0020
PO BOX 21, LA PORTE CITY, IA 50651-0021
PO BOX 22, LA PORTE CITY, IA 50651-0022
PO BOX 23, LA PORTE CITY, IA 50651-0023
PO BOX 24, LA PORTE CITY, IA 50651-0024
PO BOX 25, LA PORTE CITY, IA 50651-0025
PO BOX 26, LA PORTE CITY, IA 50651-0026
PO BOX 27, LA PORTE CITY, IA 50651-0027
PO BOX 28, LA PORTE CITY, IA 50651-0028
PO BOX 29, LA PORTE CITY, IA 50651-0029
PO BOX 30, LA PORTE CITY, IA 50651-0030
PO BOX 31, LA PORTE CITY, IA 50651-0031
PO BOX 32, LA PORTE CITY, IA 50651-0032
PO BOX 33, LA PORTE CITY, IA 50651-0033
PO BOX 34, LA PORTE CITY, IA 50651-0034
PO BOX 35, LA PORTE CITY, IA 50651-0035
PO BOX 36, LA PORTE CITY, IA 50651-0036
PO BOX 37, LA PORTE CITY, IA 50651-0037
PO BOX 38, LA PORTE CITY, IA 50651-0038
PO BOX 39, LA PORTE CITY, IA 50651-0039
PO BOX 40, LA PORTE CITY, IA 50651-0040
PO BOX 41, LA PORTE CITY, IA 50651-0041
PO BOX 42, LA PORTE CITY, IA 50651-0042
PO BOX 43, LA PORTE CITY, IA 50651-0043
PO BOX 44, LA PORTE CITY, IA 50651-0044
PO BOX 45, LA PORTE CITY, IA 50651-0045
PO BOX 46, LA PORTE CITY, IA 50651-0046
PO BOX 47, LA PORTE CITY, IA 50651-0047
PO BOX 48, LA PORTE CITY, IA 50651-0048
PO BOX 49, LA PORTE CITY, IA 50651-0049
PO BOX 50, LA PORTE CITY, IA 50651-0050
PO BOX 51, LA PORTE CITY, IA 50651-0051
PO BOX 52, LA PORTE CITY, IA 50651-0052
PO BOX 53, LA PORTE CITY, IA 50651-0053
PO BOX 54, LA PORTE CITY, IA 50651-0054
PO BOX 55, LA PORTE CITY, IA 50651-0055
PO BOX 56, LA PORTE CITY, IA 50651-0056
PO BOX 57, LA PORTE CITY, IA 50651-0057
PO BOX 58, LA PORTE CITY, IA 50651-0058
PO BOX 59, LA PORTE CITY, IA 50651-0059
PO BOX 60, LA PORTE CITY, IA 50651-0060
PO BOX 61, LA PORTE CITY, IA 50651-0061
PO BOX 62, LA PORTE CITY, IA 50651-0062
PO BOX 63, LA PORTE CITY, IA 50651-0063
PO BOX 64, LA PORTE CITY, IA 50651-0064
PO BOX 65, LA PORTE CITY, IA 50651-0065
PO BOX 66, LA PORTE CITY, IA 50651-0066
PO BOX 67, LA PORTE CITY, IA 50651-0067
PO BOX 68, LA PORTE CITY, IA 50651-0068
PO BOX 69, LA PORTE CITY, IA 50651-0069
PO BOX 70, LA PORTE CITY, IA 50651-0070
PO BOX 71, LA PORTE CITY, IA 50651-0071
PO BOX 72, LA PORTE CITY, IA 50651-0072
PO BOX 73, LA PORTE CITY, IA 50651-0073
PO BOX 74, LA PORTE CITY, IA 50651-0074
PO BOX 75, LA PORTE CITY, IA 50651-0075
PO BOX 76, LA PORTE CITY, IA 50651-0076
PO BOX 77, LA PORTE CITY, IA 50651-0077
PO BOX 78, LA PORTE CITY, IA 50651-0078
PO BOX 79, LA PORTE CITY, IA 50651-0079
PO BOX 80, LA PORTE CITY, IA 50651-0080
PO BOX 81, LA PORTE CITY, IA 50651-0081
PO BOX 82, LA PORTE CITY, IA 50651-0082
PO BOX 83, LA PORTE CITY, IA 50651-0083
PO BOX 84, LA PORTE CITY, IA 50651-0084
PO BOX 85, LA PORTE CITY, IA 50651-0085
PO BOX 86, LA PORTE CITY, IA 50651-0086
PO BOX 87, LA PORTE CITY, IA 50651-0087
PO BOX 88, LA PORTE CITY, IA 50651-0088
PO BOX 89, LA PORTE CITY, IA 50651-0089
PO BOX 90, LA PORTE CITY, IA 50651-0090
PO BOX 91, LA PORTE CITY, IA 50651-0091
PO BOX 92, LA PORTE CITY, IA 50651-0092
PO BOX 93, LA PORTE CITY, IA 50651-0093
PO BOX 94, LA PORTE CITY, IA 50651-0094
PO BOX 95, LA PORTE CITY, IA 50651-0095
PO BOX 96, LA PORTE CITY, IA 50651-0096
PO BOX 97, LA PORTE CITY, IA 50651-0097
PO BOX 98, LA PORTE CITY, IA 50651-0098
PO BOX 99, LA PORTE CITY, IA 50651-0099
PO BOX 100, LA PORTE CITY, IA 50651-0100
PO BOX 101, LA PORTE CITY, IA 50651-0101
PO BOX 102, LA PORTE CITY, IA 50651-0102
PO BOX 103, LA PORTE CITY, IA 50651-0103
PO BOX 104, LA PORTE CITY, IA 50651-0104
PO BOX 105, LA PORTE CITY, IA 50651-0105
PO BOX 106, LA PORTE CITY, IA 50651-0106
PO BOX 107, LA PORTE CITY, IA 50651-0107
PO BOX 108, LA PORTE CITY, IA 50651-0108
PO BOX 109, LA PORTE CITY, IA 50651-0109
PO BOX 110, LA PORTE CITY, IA 50651-0110
PO BOX 111, LA PORTE CITY, IA 50651-0111
PO BOX 112, LA PORTE CITY, IA 50651-0112
PO BOX 113, LA PORTE CITY, IA 50651-0113
PO BOX 114, LA PORTE CITY, IA 50651-0114
PO BOX 115, LA PORTE CITY, IA 50651-0115
PO BOX 116, LA PORTE CITY, IA 50651-0116
PO BOX 117, LA PORTE CITY, IA 50651-0117
PO BOX 118, LA PORTE CITY, IA 50651-0118
PO BOX 119, LA PORTE CITY, IA 50651-0119
PO BOX 120, LA PORTE CITY, IA 50651-0120
PO BOX 121, LA PORTE CITY, IA 50651-0121
PO BOX 122, LA PORTE CITY, IA 50651-0122
PO BOX 123, LA PORTE CITY, IA 50651-0123
PO BOX 124, LA PORTE CITY, IA 50651-0124
PO BOX 125, LA PORTE CITY, IA 50651-0125
PO BOX 126, LA PORTE CITY, IA 50651-0126
PO BOX 127, LA PORTE CITY, IA 50651-0127
PO BOX 128, LA PORTE CITY, IA 50651-0128
PO BOX 129, LA PORTE CITY, IA 50651-0129
PO BOX 130, LA PORTE CITY, IA 50651-0130
PO BOX 131, LA PORTE CITY, IA 50651-0131
PO BOX 132, LA PORTE CITY, IA 50651-0132
PO BOX 133, LA PORTE CITY, IA 50651-0133
PO BOX 134, LA PORTE CITY, IA 50651-0134
PO BOX 135, LA PORTE CITY, IA 50651-0135
PO BOX 136, LA PORTE CITY, IA 50651-0136
PO BOX 137, LA PORTE CITY, IA 50651-0137
PO BOX 138, LA PORTE CITY, IA 50651-0138
PO BOX 139, LA PORTE CITY, IA 50651-0139
PO BOX 140, LA PORTE CITY, IA 50651-0140
PO BOX 141, LA PORTE CITY, IA 50651-0141
PO BOX 142, LA PORTE CITY, IA 50651-0142
PO BOX 143, LA PORTE CITY, IA 50651-0143
PO BOX 144, LA PORTE CITY, IA 50651-0144
PO BOX 145, LA PORTE CITY, IA 50651-0145
PO BOX 146, LA PORTE CITY, IA 50651-0146
PO BOX 147, LA PORTE CITY, IA 50651-0147
PO BOX 148, LA PORTE CITY, IA 50651-0148
PO BOX 149, LA PORTE CITY, IA 50651-0149
PO BOX 150, LA PORTE CITY, IA 50651-0150
PO BOX 151, LA PORTE CITY, IA 50651-0151
PO BOX 152, LA PORTE CITY, IA 50651-0152
PO BOX 153, LA PORTE CITY, IA 50651-0153
PO BOX 154, LA PORTE CITY, IA 50651-0154
PO BOX 155, LA PORTE CITY, IA 50651-0155
PO BOX 156, LA PORTE CITY, IA 50651-0156
PO BOX 157, LA PORTE CITY, IA 50651-0157
PO BOX 158, LA PORTE CITY, IA 50651-0158
PO BOX 159, LA PORTE CITY, IA 50651-0159
PO BOX 160, LA PORTE CITY, IA 50651-0160
PO BOX 161, LA PORTE CITY, IA 50651-0161
PO BOX 162, LA PORTE CITY, IA 50651-0162
PO BOX 163, LA PORTE CITY, IA 50651-0163
PO BOX 164, LA PORTE CITY, IA 50651-0164
PO BOX 165, LA PORTE CITY, IA 50651-0165
PO BOX 166, LA PORTE CITY, IA 50651-0166
PO BOX 167, LA PORTE CITY, IA 50651-0167
PO BOX 168, LA PORTE CITY, IA 50651-0168
PO BOX 169, LA PORTE CITY, IA 50651-0169
PO BOX 170, LA PORTE CITY, IA 50651-0170
PO BOX 171, LA PORTE CITY, IA 50651-0171
PO BOX 172, LA PORTE CITY, IA 50651-0172
PO BOX 173, LA PORTE CITY, IA 50651-0173
PO BOX 174, LA PORTE CITY, IA 50651-0174
PO BOX 175, LA PORTE CITY, IA 50651-0175
PO BOX 176, LA PORTE CITY, IA 50651-0176
PO BOX 177, LA PORTE CITY, IA 50651-0177
PO BOX 178, LA PORTE CITY, IA 50651-0178
PO BOX 179, LA PORTE CITY, IA 50651-0179
PO BOX 180, LA PORTE CITY, IA 50651-0180
PO BOX 181, LA PORTE CITY, IA 50651-0181
PO BOX 182, LA PORTE CITY, IA 50651-0182
PO BOX 183, LA PORTE CITY, IA 50651-0183
PO BOX 184, LA PORTE CITY, IA 50651-0184
PO BOX 185, LA PORTE CITY, IA 50651-0185
PO BOX 186, LA PORTE CITY, IA 50651-0186
PO BOX 187, LA PORTE CITY, IA 50651-0187
PO BOX 188, LA PORTE CITY, IA 50651-0188
PO BOX 189, LA PORTE CITY, IA 50651-0189
PO BOX 190, LA PORTE CITY, IA 50651-0190
PO BOX 191, LA PORTE CITY, IA 50651-0191
PO BOX 192, LA PORTE CITY, IA 50651-0192
PO BOX 193, LA PORTE CITY, IA 50651-0193
PO BOX 194, LA PORTE CITY, IA 50651-0194
PO BOX 195, LA PORTE CITY, IA 50651-0195
PO BOX 196, LA PORTE CITY, IA 50651-0196
PO BOX 197, LA PORTE CITY, IA 50651-0197
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