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, THORNTON, IA 50479-0001
PO BOX 2, THORNTON, IA 50479-0002
PO BOX 3, THORNTON, IA 50479-0003
PO BOX 4, THORNTON, IA 50479-0004
PO BOX 5, THORNTON, IA 50479-0005
PO BOX 6, THORNTON, IA 50479-0006
PO BOX 7, THORNTON, IA 50479-0007
PO BOX 8, THORNTON, IA 50479-0008
PO BOX 9, THORNTON, IA 50479-0009
PO BOX 10, THORNTON, IA 50479-0010
PO BOX 11, THORNTON, IA 50479-0011
PO BOX 12, THORNTON, IA 50479-0012
PO BOX 13, THORNTON, IA 50479-0013
PO BOX 14, THORNTON, IA 50479-0014
PO BOX 15, THORNTON, IA 50479-0015
PO BOX 16, THORNTON, IA 50479-0016
PO BOX 17, THORNTON, IA 50479-0017
PO BOX 18, THORNTON, IA 50479-0018
PO BOX 19, THORNTON, IA 50479-0019
PO BOX 20, THORNTON, IA 50479-0020
PO BOX 21, THORNTON, IA 50479-0021
PO BOX 22, THORNTON, IA 50479-0022
PO BOX 23, THORNTON, IA 50479-0023
PO BOX 24, THORNTON, IA 50479-0024
PO BOX 25, THORNTON, IA 50479-0025
PO BOX 26, THORNTON, IA 50479-0026
PO BOX 27, THORNTON, IA 50479-0027
PO BOX 28, THORNTON, IA 50479-0028
PO BOX 29, THORNTON, IA 50479-0029
PO BOX 30, THORNTON, IA 50479-0030
PO BOX 31, THORNTON, IA 50479-0031
PO BOX 32, THORNTON, IA 50479-0032
PO BOX 33, THORNTON, IA 50479-0033
PO BOX 34, THORNTON, IA 50479-0034
PO BOX 35, THORNTON, IA 50479-0035
PO BOX 36, THORNTON, IA 50479-0036
PO BOX 37, THORNTON, IA 50479-0037
PO BOX 38, THORNTON, IA 50479-0038
PO BOX 39, THORNTON, IA 50479-0039
PO BOX 40, THORNTON, IA 50479-0040
PO BOX 41, THORNTON, IA 50479-0041
PO BOX 42, THORNTON, IA 50479-0042
PO BOX 43, THORNTON, IA 50479-0043
PO BOX 44, THORNTON, IA 50479-0044
PO BOX 45, THORNTON, IA 50479-0045
PO BOX 46, THORNTON, IA 50479-0046
PO BOX 47, THORNTON, IA 50479-0047
PO BOX 48, THORNTON, IA 50479-0048
PO BOX 49, THORNTON, IA 50479-0049
PO BOX 50, THORNTON, IA 50479-0050
PO BOX 51, THORNTON, IA 50479-0051
PO BOX 52, THORNTON, IA 50479-0052
PO BOX 53, THORNTON, IA 50479-0053
PO BOX 54, THORNTON, IA 50479-0054
PO BOX 55, THORNTON, IA 50479-0055
PO BOX 56, THORNTON, IA 50479-0056
PO BOX 57, THORNTON, IA 50479-0057
PO BOX 58, THORNTON, IA 50479-0058
PO BOX 59, THORNTON, IA 50479-0059
PO BOX 60, THORNTON, IA 50479-0060
PO BOX 61, THORNTON, IA 50479-0061
PO BOX 62, THORNTON, IA 50479-0062
PO BOX 63, THORNTON, IA 50479-0063
PO BOX 64, THORNTON, IA 50479-0064
PO BOX 65, THORNTON, IA 50479-0065
PO BOX 66, THORNTON, IA 50479-0066
PO BOX 67, THORNTON, IA 50479-0067
PO BOX 68, THORNTON, IA 50479-0068
PO BOX 69, THORNTON, IA 50479-0069
PO BOX 70, THORNTON, IA 50479-0070
PO BOX 71, THORNTON, IA 50479-0071
PO BOX 72, THORNTON, IA 50479-0072
PO BOX 73, THORNTON, IA 50479-0073
PO BOX 74, THORNTON, IA 50479-0074
PO BOX 75, THORNTON, IA 50479-0075
PO BOX 76, THORNTON, IA 50479-0076
PO BOX 77, THORNTON, IA 50479-0077
PO BOX 78, THORNTON, IA 50479-0078
PO BOX 79, THORNTON, IA 50479-0079
PO BOX 80, THORNTON, IA 50479-0080
PO BOX 81, THORNTON, IA 50479-0081
PO BOX 82, THORNTON, IA 50479-0082
PO BOX 83, THORNTON, IA 50479-0083
PO BOX 84, THORNTON, IA 50479-0084
PO BOX 85, THORNTON, IA 50479-0085
PO BOX 86, THORNTON, IA 50479-0086
PO BOX 87, THORNTON, IA 50479-0087
PO BOX 88, THORNTON, IA 50479-0088
PO BOX 89, THORNTON, IA 50479-0089
PO BOX 90, THORNTON, IA 50479-0090
PO BOX 91, THORNTON, IA 50479-0091
PO BOX 92, THORNTON, IA 50479-0092
PO BOX 93, THORNTON, IA 50479-0093
PO BOX 94, THORNTON, IA 50479-0094
PO BOX 95, THORNTON, IA 50479-0095
PO BOX 96, THORNTON, IA 50479-0096
PO BOX 97, THORNTON, IA 50479-0097
PO BOX 98, THORNTON, IA 50479-0098
PO BOX 99, THORNTON, IA 50479-0099
PO BOX 100, THORNTON, IA 50479-0100
PO BOX 101, THORNTON, IA 50479-0101
PO BOX 102, THORNTON, IA 50479-0102
PO BOX 103, THORNTON, IA 50479-0103
PO BOX 104, THORNTON, IA 50479-0104
PO BOX 105, THORNTON, IA 50479-0105
PO BOX 106, THORNTON, IA 50479-0106
PO BOX 107, THORNTON, IA 50479-0107
PO BOX 108, THORNTON, IA 50479-0108
PO BOX 109, THORNTON, IA 50479-0109
PO BOX 110, THORNTON, IA 50479-0110
PO BOX 111, THORNTON, IA 50479-0111
PO BOX 112, THORNTON, IA 50479-0112
PO BOX 113, THORNTON, IA 50479-0113
PO BOX 114, THORNTON, IA 50479-0114
PO BOX 115, THORNTON, IA 50479-0115
PO BOX 116, THORNTON, IA 50479-0116
PO BOX 117, THORNTON, IA 50479-0117
PO BOX 118, THORNTON, IA 50479-0118
PO BOX 119, THORNTON, IA 50479-0119
PO BOX 120, THORNTON, IA 50479-0120
PO BOX 121, THORNTON, IA 50479-0121
PO BOX 122, THORNTON, IA 50479-0122
PO BOX 123, THORNTON, IA 50479-0123
PO BOX 124, THORNTON, IA 50479-0124
PO BOX 125, THORNTON, IA 50479-0125
PO BOX 126, THORNTON, IA 50479-0126
PO BOX 127, THORNTON, IA 50479-0127
PO BOX 128, THORNTON, IA 50479-0128
PO BOX 129, THORNTON, IA 50479-0129
PO BOX 130, THORNTON, IA 50479-0130
PO BOX 131, THORNTON, IA 50479-0131
PO BOX 132, THORNTON, IA 50479-0132
PO BOX 133, THORNTON, IA 50479-0133
PO BOX 134, THORNTON, IA 50479-0134
PO BOX 135, THORNTON, IA 50479-0135
PO BOX 136, THORNTON, IA 50479-0136
PO BOX 137, THORNTON, IA 50479-0137
PO BOX 138, THORNTON, IA 50479-0138
PO BOX 139, THORNTON, IA 50479-0139
PO BOX 140, THORNTON, IA 50479-0140
PO BOX 141, THORNTON, IA 50479-0141
PO BOX 142, THORNTON, IA 50479-0142
PO BOX 143, THORNTON, IA 50479-0143
PO BOX 144, THORNTON, IA 50479-0144
PO BOX 145, THORNTON, IA 50479-0145
PO BOX 146, THORNTON, IA 50479-0146
PO BOX 147, THORNTON, IA 50479-0147
PO BOX 148, THORNTON, IA 50479-0148
PO BOX 149, THORNTON, IA 50479-0149
PO BOX 150, THORNTON, IA 50479-0150
PO BOX 151, THORNTON, IA 50479-0151
PO BOX 152, THORNTON, IA 50479-0152
PO BOX 153, THORNTON, IA 50479-0153
PO BOX 154, THORNTON, IA 50479-0154
PO BOX 155, THORNTON, IA 50479-0155
PO BOX 156, THORNTON, IA 50479-0156
PO BOX 157, THORNTON, IA 50479-0157
PO BOX 158, THORNTON, IA 50479-0158
PO BOX 159, THORNTON, IA 50479-0159
PO BOX 160, THORNTON, IA 50479-0160
PO BOX 161, THORNTON, IA 50479-0161
PO BOX 162, THORNTON, IA 50479-0162
PO BOX 163, THORNTON, IA 50479-0163
PO BOX 164, THORNTON, IA 50479-0164
PO BOX 165, THORNTON, IA 50479-0165
PO BOX 166, THORNTON, IA 50479-0166
PO BOX 167, THORNTON, IA 50479-0167
PO BOX 168, THORNTON, IA 50479-0168
PO BOX 169, THORNTON, IA 50479-0169
PO BOX 170, THORNTON, IA 50479-0170
PO BOX 171, THORNTON, IA 50479-0171
PO BOX 172, THORNTON, IA 50479-0172
PO BOX 173, THORNTON, IA 50479-0173
PO BOX 174, THORNTON, IA 50479-0174
PO BOX 175, THORNTON, IA 50479-0175
PO BOX 176, THORNTON, IA 50479-0176
PO BOX 177, THORNTON, IA 50479-0177
PO BOX 178, THORNTON, IA 50479-0178
PO BOX 179, THORNTON, IA 50479-0179
PO BOX 180, THORNTON, IA 50479-0180
PO BOX 181, THORNTON, IA 50479-0181
PO BOX 182, THORNTON, IA 50479-0182
PO BOX 183, THORNTON, IA 50479-0183
PO BOX 184, THORNTON, IA 50479-0184
PO BOX 185, THORNTON, IA 50479-0185
PO BOX 186, THORNTON, IA 50479-0186
PO BOX 187, THORNTON, IA 50479-0187
PO BOX 188, THORNTON, IA 50479-0188
PO BOX 189, THORNTON, IA 50479-0189
PO BOX 190, THORNTON, IA 50479-0190
PO BOX 191, THORNTON, IA 50479-0191
PO BOX 192, THORNTON, IA 50479-0192
PO BOX 193, THORNTON, IA 50479-0193
PO BOX 194, THORNTON, IA 50479-0194
PO BOX 195, THORNTON, IA 50479-0195
PO BOX 196, THORNTON, IA 50479-0196
PO BOX 197, THORNTON, IA 50479-0197
PO BOX 198, THORNTON, IA 50479-0198
PO BOX 199, THORNTON, IA 50479-0199
PO BOX 200, THORNTON, IA 50479-0200
PO BOX 201, THORNTON, IA 50479-0201
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