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, NORA SPRINGS, IA 50458-0001
PO BOX 2, NORA SPRINGS, IA 50458-0002
PO BOX 3, NORA SPRINGS, IA 50458-0003
PO BOX 4, NORA SPRINGS, IA 50458-0004
PO BOX 5, NORA SPRINGS, IA 50458-0005
PO BOX 6, NORA SPRINGS, IA 50458-0006
PO BOX 7, NORA SPRINGS, IA 50458-0007
PO BOX 8, NORA SPRINGS, IA 50458-0008
PO BOX 9, NORA SPRINGS, IA 50458-0009
PO BOX 10, NORA SPRINGS, IA 50458-0010
PO BOX 11, NORA SPRINGS, IA 50458-0011
PO BOX 12, NORA SPRINGS, IA 50458-0012
PO BOX 13, NORA SPRINGS, IA 50458-0013
PO BOX 14, NORA SPRINGS, IA 50458-0014
PO BOX 15, NORA SPRINGS, IA 50458-0015
PO BOX 16, NORA SPRINGS, IA 50458-0016
PO BOX 17, NORA SPRINGS, IA 50458-0017
PO BOX 18, NORA SPRINGS, IA 50458-0018
PO BOX 19, NORA SPRINGS, IA 50458-0019
PO BOX 20, NORA SPRINGS, IA 50458-0020
PO BOX 21, NORA SPRINGS, IA 50458-0021
PO BOX 22, NORA SPRINGS, IA 50458-0022
PO BOX 23, NORA SPRINGS, IA 50458-0023
PO BOX 24, NORA SPRINGS, IA 50458-0024
PO BOX 25, NORA SPRINGS, IA 50458-0025
PO BOX 26, NORA SPRINGS, IA 50458-0026
PO BOX 27, NORA SPRINGS, IA 50458-0027
PO BOX 28, NORA SPRINGS, IA 50458-0028
PO BOX 29, NORA SPRINGS, IA 50458-0029
PO BOX 30, NORA SPRINGS, IA 50458-0030
PO BOX 31, NORA SPRINGS, IA 50458-0031
PO BOX 32, NORA SPRINGS, IA 50458-0032
PO BOX 33, NORA SPRINGS, IA 50458-0033
PO BOX 34, NORA SPRINGS, IA 50458-0034
PO BOX 35, NORA SPRINGS, IA 50458-0035
PO BOX 36, NORA SPRINGS, IA 50458-0036
PO BOX 37, NORA SPRINGS, IA 50458-0037
PO BOX 38, NORA SPRINGS, IA 50458-0038
PO BOX 39, NORA SPRINGS, IA 50458-0039
PO BOX 40, NORA SPRINGS, IA 50458-0040
PO BOX 41, NORA SPRINGS, IA 50458-0041
PO BOX 42, NORA SPRINGS, IA 50458-0042
PO BOX 43, NORA SPRINGS, IA 50458-0043
PO BOX 44, NORA SPRINGS, IA 50458-0044
PO BOX 45, NORA SPRINGS, IA 50458-0045
PO BOX 46, NORA SPRINGS, IA 50458-0046
PO BOX 47, NORA SPRINGS, IA 50458-0047
PO BOX 48, NORA SPRINGS, IA 50458-0048
PO BOX 49, NORA SPRINGS, IA 50458-0049
PO BOX 50, NORA SPRINGS, IA 50458-0050
PO BOX 51, NORA SPRINGS, IA 50458-0051
PO BOX 52, NORA SPRINGS, IA 50458-0052
PO BOX 53, NORA SPRINGS, IA 50458-0053
PO BOX 54, NORA SPRINGS, IA 50458-0054
PO BOX 55, NORA SPRINGS, IA 50458-0055
PO BOX 56, NORA SPRINGS, IA 50458-0056
PO BOX 57, NORA SPRINGS, IA 50458-0057
PO BOX 58, NORA SPRINGS, IA 50458-0058
PO BOX 59, NORA SPRINGS, IA 50458-0059
PO BOX 60, NORA SPRINGS, IA 50458-0060
PO BOX 61, NORA SPRINGS, IA 50458-0061
PO BOX 62, NORA SPRINGS, IA 50458-0062
PO BOX 63, NORA SPRINGS, IA 50458-0063
PO BOX 64, NORA SPRINGS, IA 50458-0064
PO BOX 65, NORA SPRINGS, IA 50458-0065
PO BOX 66, NORA SPRINGS, IA 50458-0066
PO BOX 67, NORA SPRINGS, IA 50458-0067
PO BOX 68, NORA SPRINGS, IA 50458-0068
PO BOX 69, NORA SPRINGS, IA 50458-0069
PO BOX 70, NORA SPRINGS, IA 50458-0070
PO BOX 71, NORA SPRINGS, IA 50458-0071
PO BOX 72, NORA SPRINGS, IA 50458-0072
PO BOX 73, NORA SPRINGS, IA 50458-0073
PO BOX 74, NORA SPRINGS, IA 50458-0074
PO BOX 75, NORA SPRINGS, IA 50458-0075
PO BOX 76, NORA SPRINGS, IA 50458-0076
PO BOX 77, NORA SPRINGS, IA 50458-0077
PO BOX 78, NORA SPRINGS, IA 50458-0078
PO BOX 79, NORA SPRINGS, IA 50458-0079
PO BOX 80, NORA SPRINGS, IA 50458-0080
PO BOX 81, NORA SPRINGS, IA 50458-0081
PO BOX 82, NORA SPRINGS, IA 50458-0082
PO BOX 83, NORA SPRINGS, IA 50458-0083
PO BOX 84, NORA SPRINGS, IA 50458-0084
PO BOX 85, NORA SPRINGS, IA 50458-0085
PO BOX 86, NORA SPRINGS, IA 50458-0086
PO BOX 87, NORA SPRINGS, IA 50458-0087
PO BOX 88, NORA SPRINGS, IA 50458-0088
PO BOX 89, NORA SPRINGS, IA 50458-0089
PO BOX 90, NORA SPRINGS, IA 50458-0090
PO BOX 91, NORA SPRINGS, IA 50458-0091
PO BOX 92, NORA SPRINGS, IA 50458-0092
PO BOX 93, NORA SPRINGS, IA 50458-0093
PO BOX 94, NORA SPRINGS, IA 50458-0094
PO BOX 95, NORA SPRINGS, IA 50458-0095
PO BOX 96, NORA SPRINGS, IA 50458-0096
PO BOX 97, NORA SPRINGS, IA 50458-0097
PO BOX 98, NORA SPRINGS, IA 50458-0098
PO BOX 99, NORA SPRINGS, IA 50458-0099
PO BOX 100, NORA SPRINGS, IA 50458-0100
PO BOX 101, NORA SPRINGS, IA 50458-0101
PO BOX 102, NORA SPRINGS, IA 50458-0102
PO BOX 103, NORA SPRINGS, IA 50458-0103
PO BOX 104, NORA SPRINGS, IA 50458-0104
PO BOX 105, NORA SPRINGS, IA 50458-0105
PO BOX 106, NORA SPRINGS, IA 50458-0106
PO BOX 107, NORA SPRINGS, IA 50458-0107
PO BOX 108, NORA SPRINGS, IA 50458-0108
PO BOX 109, NORA SPRINGS, IA 50458-0109
PO BOX 110, NORA SPRINGS, IA 50458-0110
PO BOX 111, NORA SPRINGS, IA 50458-0111
PO BOX 112, NORA SPRINGS, IA 50458-0112
PO BOX 113, NORA SPRINGS, IA 50458-0113
PO BOX 114, NORA SPRINGS, IA 50458-0114
PO BOX 115, NORA SPRINGS, IA 50458-0115
PO BOX 116, NORA SPRINGS, IA 50458-0116
PO BOX 117, NORA SPRINGS, IA 50458-0117
PO BOX 118, NORA SPRINGS, IA 50458-0118
PO BOX 119, NORA SPRINGS, IA 50458-0119
PO BOX 120, NORA SPRINGS, IA 50458-0120
PO BOX 121, NORA SPRINGS, IA 50458-0121
PO BOX 122, NORA SPRINGS, IA 50458-0122
PO BOX 123, NORA SPRINGS, IA 50458-0123
PO BOX 124, NORA SPRINGS, IA 50458-0124
PO BOX 125, NORA SPRINGS, IA 50458-0125
PO BOX 126, NORA SPRINGS, IA 50458-0126
PO BOX 127, NORA SPRINGS, IA 50458-0127
PO BOX 128, NORA SPRINGS, IA 50458-0128
PO BOX 129, NORA SPRINGS, IA 50458-0129
PO BOX 130, NORA SPRINGS, IA 50458-0130
PO BOX 131, NORA SPRINGS, IA 50458-0131
PO BOX 132, NORA SPRINGS, IA 50458-0132
PO BOX 133, NORA SPRINGS, IA 50458-0133
PO BOX 134, NORA SPRINGS, IA 50458-0134
PO BOX 135, NORA SPRINGS, IA 50458-0135
PO BOX 136, NORA SPRINGS, IA 50458-0136
PO BOX 137, NORA SPRINGS, IA 50458-0137
PO BOX 138, NORA SPRINGS, IA 50458-0138
PO BOX 139, NORA SPRINGS, IA 50458-0139
PO BOX 140, NORA SPRINGS, IA 50458-0140
PO BOX 141, NORA SPRINGS, IA 50458-0141
PO BOX 142, NORA SPRINGS, IA 50458-0142
PO BOX 143, NORA SPRINGS, IA 50458-0143
PO BOX 144, NORA SPRINGS, IA 50458-0144
PO BOX 145, NORA SPRINGS, IA 50458-0145
PO BOX 146, NORA SPRINGS, IA 50458-0146
PO BOX 147, NORA SPRINGS, IA 50458-0147
PO BOX 148, NORA SPRINGS, IA 50458-0148
PO BOX 149, NORA SPRINGS, IA 50458-0149
PO BOX 150, NORA SPRINGS, IA 50458-0150
PO BOX 151, NORA SPRINGS, IA 50458-0151
PO BOX 152, NORA SPRINGS, IA 50458-0152
PO BOX 153, NORA SPRINGS, IA 50458-0153
PO BOX 154, NORA SPRINGS, IA 50458-0154
PO BOX 155, NORA SPRINGS, IA 50458-0155
PO BOX 156, NORA SPRINGS, IA 50458-0156
PO BOX 157, NORA SPRINGS, IA 50458-0157
PO BOX 158, NORA SPRINGS, IA 50458-0158
PO BOX 159, NORA SPRINGS, IA 50458-0159
PO BOX 160, NORA SPRINGS, IA 50458-0160
PO BOX 161, NORA SPRINGS, IA 50458-0161
PO BOX 162, NORA SPRINGS, IA 50458-0162
PO BOX 163, NORA SPRINGS, IA 50458-0163
PO BOX 164, NORA SPRINGS, IA 50458-0164
PO BOX 165, NORA SPRINGS, IA 50458-0165
PO BOX 166, NORA SPRINGS, IA 50458-0166
PO BOX 167, NORA SPRINGS, IA 50458-0167
PO BOX 168, NORA SPRINGS, IA 50458-0168
PO BOX 169, NORA SPRINGS, IA 50458-0169
PO BOX 170, NORA SPRINGS, IA 50458-0170
PO BOX 171, NORA SPRINGS, IA 50458-0171
PO BOX 172, NORA SPRINGS, IA 50458-0172
PO BOX 173, NORA SPRINGS, IA 50458-0173
PO BOX 174, NORA SPRINGS, IA 50458-0174
PO BOX 175, NORA SPRINGS, IA 50458-0175
PO BOX 176, NORA SPRINGS, IA 50458-0176
PO BOX 177, NORA SPRINGS, IA 50458-0177
PO BOX 178, NORA SPRINGS, IA 50458-0178
PO BOX 179, NORA SPRINGS, IA 50458-0179
PO BOX 180, NORA SPRINGS, IA 50458-0180
PO BOX 181, NORA SPRINGS, IA 50458-0181
PO BOX 182, NORA SPRINGS, IA 50458-0182
PO BOX 183, NORA SPRINGS, IA 50458-0183
PO BOX 184, NORA SPRINGS, IA 50458-0184
PO BOX 185, NORA SPRINGS, IA 50458-0185
PO BOX 186, NORA SPRINGS, IA 50458-0186
PO BOX 187, NORA SPRINGS, IA 50458-0187
PO BOX 188, NORA SPRINGS, IA 50458-0188
PO BOX 189, NORA SPRINGS, IA 50458-0189
PO BOX 190, NORA SPRINGS, IA 50458-0190
PO BOX 191, NORA SPRINGS, IA 50458-0191
PO BOX 192, NORA SPRINGS, IA 50458-0192
PO BOX 193, NORA SPRINGS, IA 50458-0193
PO BOX 194, NORA SPRINGS, IA 50458-0194
PO BOX 195, NORA SPRINGS, IA 50458-0195
PO BOX 196, NORA SPRINGS, IA 50458-0196
PO BOX 197, NORA SPRINGS, IA 50458-0197
PO BOX 198, NORA SPRINGS, IA 50458-0198
PO BOX 199, NORA SPRINGS, IA 50458-0199
PO BOX 200, NORA SPRINGS, IA 50458-0200
PO BOX 201, NORA SPRINGS, IA 50458-0201
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