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 11, NORTHWOOD, IA 50459-0011
PO BOX 12, NORTHWOOD, IA 50459-0012
PO BOX 13, NORTHWOOD, IA 50459-0013
PO BOX 14, NORTHWOOD, IA 50459-0014
PO BOX 15, NORTHWOOD, IA 50459-0015
PO BOX 16, NORTHWOOD, IA 50459-0016
PO BOX 17, NORTHWOOD, IA 50459-0017
PO BOX 18, NORTHWOOD, IA 50459-0018
PO BOX 19, NORTHWOOD, IA 50459-0019
PO BOX 20, NORTHWOOD, IA 50459-0020
PO BOX 21, NORTHWOOD, IA 50459-0021
PO BOX 22, NORTHWOOD, IA 50459-0022
PO BOX 23, NORTHWOOD, IA 50459-0023
PO BOX 24, NORTHWOOD, IA 50459-0024
PO BOX 25, NORTHWOOD, IA 50459-0025
PO BOX 26, NORTHWOOD, IA 50459-0026
PO BOX 27, NORTHWOOD, IA 50459-0027
PO BOX 28, NORTHWOOD, IA 50459-0028
PO BOX 29, NORTHWOOD, IA 50459-0029
PO BOX 30, NORTHWOOD, IA 50459-0030
PO BOX 31, NORTHWOOD, IA 50459-0031
PO BOX 32, NORTHWOOD, IA 50459-0032
PO BOX 33, NORTHWOOD, IA 50459-0033
PO BOX 34, NORTHWOOD, IA 50459-0034
PO BOX 35, NORTHWOOD, IA 50459-0035
PO BOX 36, NORTHWOOD, IA 50459-0036
PO BOX 37, NORTHWOOD, IA 50459-0037
PO BOX 38, NORTHWOOD, IA 50459-0038
PO BOX 39, NORTHWOOD, IA 50459-0039
PO BOX 40, NORTHWOOD, IA 50459-0040
PO BOX 41, NORTHWOOD, IA 50459-0041
PO BOX 42, NORTHWOOD, IA 50459-0042
PO BOX 43, NORTHWOOD, IA 50459-0043
PO BOX 44, NORTHWOOD, IA 50459-0044
PO BOX 45, NORTHWOOD, IA 50459-0045
PO BOX 46, NORTHWOOD, IA 50459-0046
PO BOX 47, NORTHWOOD, IA 50459-0047
PO BOX 48, NORTHWOOD, IA 50459-0048
PO BOX 49, NORTHWOOD, IA 50459-0049
PO BOX 50, NORTHWOOD, IA 50459-0050
PO BOX 51, NORTHWOOD, IA 50459-0051
PO BOX 52, NORTHWOOD, IA 50459-0052
PO BOX 53, NORTHWOOD, IA 50459-0053
PO BOX 54, NORTHWOOD, IA 50459-0054
PO BOX 55, NORTHWOOD, IA 50459-0055
PO BOX 56, NORTHWOOD, IA 50459-0056
PO BOX 57, NORTHWOOD, IA 50459-0057
PO BOX 58, NORTHWOOD, IA 50459-0058
PO BOX 59, NORTHWOOD, IA 50459-0059
PO BOX 60, NORTHWOOD, IA 50459-0060
PO BOX 61, NORTHWOOD, IA 50459-0061
PO BOX 62, NORTHWOOD, IA 50459-0062
PO BOX 63, NORTHWOOD, IA 50459-0063
PO BOX 64, NORTHWOOD, IA 50459-0064
PO BOX 65, NORTHWOOD, IA 50459-0065
PO BOX 66, NORTHWOOD, IA 50459-0066
PO BOX 67, NORTHWOOD, IA 50459-0067
PO BOX 68, NORTHWOOD, IA 50459-0068
PO BOX 69, NORTHWOOD, IA 50459-0069
PO BOX 70, NORTHWOOD, IA 50459-0070
PO BOX 71, NORTHWOOD, IA 50459-0071
PO BOX 72, NORTHWOOD, IA 50459-0072
PO BOX 73, NORTHWOOD, IA 50459-0073
PO BOX 74, NORTHWOOD, IA 50459-0074
PO BOX 75, NORTHWOOD, IA 50459-0075
PO BOX 76, NORTHWOOD, IA 50459-0076
PO BOX 77, NORTHWOOD, IA 50459-0077
PO BOX 78, NORTHWOOD, IA 50459-0078
PO BOX 79, NORTHWOOD, IA 50459-0079
PO BOX 80, NORTHWOOD, IA 50459-0080
PO BOX 81, NORTHWOOD, IA 50459-0081
PO BOX 82, NORTHWOOD, IA 50459-0082
PO BOX 83, NORTHWOOD, IA 50459-0083
PO BOX 84, NORTHWOOD, IA 50459-0084
PO BOX 85, NORTHWOOD, IA 50459-0085
PO BOX 86, NORTHWOOD, IA 50459-0086
PO BOX 87, NORTHWOOD, IA 50459-0087
PO BOX 88, NORTHWOOD, IA 50459-0088
PO BOX 89, NORTHWOOD, IA 50459-0089
PO BOX 90, NORTHWOOD, IA 50459-0090
PO BOX 91, NORTHWOOD, IA 50459-0091
PO BOX 92, NORTHWOOD, IA 50459-0092
PO BOX 93, NORTHWOOD, IA 50459-0093
PO BOX 94, NORTHWOOD, IA 50459-0094
PO BOX 95, NORTHWOOD, IA 50459-0095
PO BOX 96, NORTHWOOD, IA 50459-0096
PO BOX 97, NORTHWOOD, IA 50459-0097
PO BOX 98, NORTHWOOD, IA 50459-0098
PO BOX 99, NORTHWOOD, IA 50459-0099
PO BOX 100, NORTHWOOD, IA 50459-0100
PO BOX 101, NORTHWOOD, IA 50459-0101
PO BOX 102, NORTHWOOD, IA 50459-0102
PO BOX 103, NORTHWOOD, IA 50459-0103
PO BOX 104, NORTHWOOD, IA 50459-0104
PO BOX 105, NORTHWOOD, IA 50459-0105
PO BOX 106, NORTHWOOD, IA 50459-0106
PO BOX 107, NORTHWOOD, IA 50459-0107
PO BOX 108, NORTHWOOD, IA 50459-0108
PO BOX 109, NORTHWOOD, IA 50459-0109
PO BOX 110, NORTHWOOD, IA 50459-0110
PO BOX 111, NORTHWOOD, IA 50459-0111
PO BOX 112, NORTHWOOD, IA 50459-0112
PO BOX 113, NORTHWOOD, IA 50459-0113
PO BOX 114, NORTHWOOD, IA 50459-0114
PO BOX 115, NORTHWOOD, IA 50459-0115
PO BOX 116, NORTHWOOD, IA 50459-0116
PO BOX 117, NORTHWOOD, IA 50459-0117
PO BOX 118, NORTHWOOD, IA 50459-0118
PO BOX 119, NORTHWOOD, IA 50459-0119
PO BOX 120, NORTHWOOD, IA 50459-0120
PO BOX 121, NORTHWOOD, IA 50459-0121
PO BOX 122, NORTHWOOD, IA 50459-0122
PO BOX 123, NORTHWOOD, IA 50459-0123
PO BOX 124, NORTHWOOD, IA 50459-0124
PO BOX 125, NORTHWOOD, IA 50459-0125
PO BOX 126, NORTHWOOD, IA 50459-0126
PO BOX 127, NORTHWOOD, IA 50459-0127
PO BOX 128, NORTHWOOD, IA 50459-0128
PO BOX 129, NORTHWOOD, IA 50459-0129
PO BOX 130, NORTHWOOD, IA 50459-0130
PO BOX 131, NORTHWOOD, IA 50459-0131
PO BOX 132, NORTHWOOD, IA 50459-0132
PO BOX 133, NORTHWOOD, IA 50459-0133
PO BOX 134, NORTHWOOD, IA 50459-0134
PO BOX 135, NORTHWOOD, IA 50459-0135
PO BOX 136, NORTHWOOD, IA 50459-0136
PO BOX 137, NORTHWOOD, IA 50459-0137
PO BOX 138, NORTHWOOD, IA 50459-0138
PO BOX 139, NORTHWOOD, IA 50459-0139
PO BOX 140, NORTHWOOD, IA 50459-0140
PO BOX 141, NORTHWOOD, IA 50459-0141
PO BOX 142, NORTHWOOD, IA 50459-0142
PO BOX 143, NORTHWOOD, IA 50459-0143
PO BOX 144, NORTHWOOD, IA 50459-0144
PO BOX 145, NORTHWOOD, IA 50459-0145
PO BOX 146, NORTHWOOD, IA 50459-0146
PO BOX 147, NORTHWOOD, IA 50459-0147
PO BOX 148, NORTHWOOD, IA 50459-0148
PO BOX 149, NORTHWOOD, IA 50459-0149
PO BOX 150, NORTHWOOD, IA 50459-0150
PO BOX 151, NORTHWOOD, IA 50459-0151
PO BOX 152, NORTHWOOD, IA 50459-0152
PO BOX 153, NORTHWOOD, IA 50459-0153
PO BOX 154, NORTHWOOD, IA 50459-0154
PO BOX 155, NORTHWOOD, IA 50459-0155
PO BOX 156, NORTHWOOD, IA 50459-0156
PO BOX 157, NORTHWOOD, IA 50459-0157
PO BOX 158, NORTHWOOD, IA 50459-0158
PO BOX 159, NORTHWOOD, IA 50459-0159
PO BOX 160, NORTHWOOD, IA 50459-0160
PO BOX 161, NORTHWOOD, IA 50459-0161
PO BOX 162, NORTHWOOD, IA 50459-0162
PO BOX 163, NORTHWOOD, IA 50459-0163
PO BOX 164, NORTHWOOD, IA 50459-0164
PO BOX 165, NORTHWOOD, IA 50459-0165
PO BOX 166, NORTHWOOD, IA 50459-0166
PO BOX 167, NORTHWOOD, IA 50459-0167
PO BOX 168, NORTHWOOD, IA 50459-0168
PO BOX 169, NORTHWOOD, IA 50459-0169
PO BOX 170, NORTHWOOD, IA 50459-0170
PO BOX 171, NORTHWOOD, IA 50459-0171
PO BOX 172, NORTHWOOD, IA 50459-0172
PO BOX 173, NORTHWOOD, IA 50459-0173
PO BOX 174, NORTHWOOD, IA 50459-0174
PO BOX 175, NORTHWOOD, IA 50459-0175
PO BOX 176, NORTHWOOD, IA 50459-0176
PO BOX 177, NORTHWOOD, IA 50459-0177
PO BOX 178, NORTHWOOD, IA 50459-0178
PO BOX 179, NORTHWOOD, IA 50459-0179
PO BOX 180, NORTHWOOD, IA 50459-0180
PO BOX 181, NORTHWOOD, IA 50459-0181
PO BOX 182, NORTHWOOD, IA 50459-0182
PO BOX 183, NORTHWOOD, IA 50459-0183
PO BOX 184, NORTHWOOD, IA 50459-0184
PO BOX 185, NORTHWOOD, IA 50459-0185
PO BOX 186, NORTHWOOD, IA 50459-0186
PO BOX 187, NORTHWOOD, IA 50459-0187
PO BOX 188, NORTHWOOD, IA 50459-0188
PO BOX 189, NORTHWOOD, IA 50459-0189
PO BOX 190, NORTHWOOD, IA 50459-0190
PO BOX 191, NORTHWOOD, IA 50459-0191
PO BOX 192, NORTHWOOD, IA 50459-0192
PO BOX 193, NORTHWOOD, IA 50459-0193
PO BOX 194, NORTHWOOD, IA 50459-0194
PO BOX 195, NORTHWOOD, IA 50459-0195
PO BOX 196, NORTHWOOD, IA 50459-0196
PO BOX 197, NORTHWOOD, IA 50459-0197
PO BOX 198, NORTHWOOD, IA 50459-0198
PO BOX 199, NORTHWOOD, IA 50459-0199
PO BOX 200, NORTHWOOD, IA 50459-0200
PO BOX 201, NORTHWOOD, IA 50459-0201
PO BOX 202, NORTHWOOD, IA 50459-0202
PO BOX 203, NORTHWOOD, IA 50459-0203
PO BOX 204, NORTHWOOD, IA 50459-0204
PO BOX 205, NORTHWOOD, IA 50459-0205
PO BOX 206, NORTHWOOD, IA 50459-0206
PO BOX 207, NORTHWOOD, IA 50459-0207
PO BOX 208, NORTHWOOD, IA 50459-0208
PO BOX 209, NORTHWOOD, IA 50459-0209
PO BOX 210, NORTHWOOD, IA 50459-0210
PO BOX 211, NORTHWOOD, IA 50459-0211
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