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, SPRINGVILLE, IA 52336-0001
PO BOX 2, SPRINGVILLE, IA 52336-0002
PO BOX 3, SPRINGVILLE, IA 52336-0003
PO BOX 4, SPRINGVILLE, IA 52336-0004
PO BOX 5, SPRINGVILLE, IA 52336-0005
PO BOX 6, SPRINGVILLE, IA 52336-0006
PO BOX 7, SPRINGVILLE, IA 52336-0007
PO BOX 8, SPRINGVILLE, IA 52336-0008
PO BOX 9, SPRINGVILLE, IA 52336-0009
PO BOX 10, SPRINGVILLE, IA 52336-0010
PO BOX 11, SPRINGVILLE, IA 52336-0011
PO BOX 12, SPRINGVILLE, IA 52336-0012
PO BOX 13, SPRINGVILLE, IA 52336-0013
PO BOX 14, SPRINGVILLE, IA 52336-0014
PO BOX 15, SPRINGVILLE, IA 52336-0015
PO BOX 16, SPRINGVILLE, IA 52336-0016
PO BOX 17, SPRINGVILLE, IA 52336-0017
PO BOX 18, SPRINGVILLE, IA 52336-0018
PO BOX 19, SPRINGVILLE, IA 52336-0019
PO BOX 20, SPRINGVILLE, IA 52336-0020
PO BOX 21, SPRINGVILLE, IA 52336-0021
PO BOX 22, SPRINGVILLE, IA 52336-0022
PO BOX 23, SPRINGVILLE, IA 52336-0023
PO BOX 24, SPRINGVILLE, IA 52336-0024
PO BOX 25, SPRINGVILLE, IA 52336-0025
PO BOX 26, SPRINGVILLE, IA 52336-0026
PO BOX 27, SPRINGVILLE, IA 52336-0027
PO BOX 28, SPRINGVILLE, IA 52336-0028
PO BOX 29, SPRINGVILLE, IA 52336-0029
PO BOX 30, SPRINGVILLE, IA 52336-0030
PO BOX 31, SPRINGVILLE, IA 52336-0031
PO BOX 32, SPRINGVILLE, IA 52336-0032
PO BOX 33, SPRINGVILLE, IA 52336-0033
PO BOX 34, SPRINGVILLE, IA 52336-0034
PO BOX 35, SPRINGVILLE, IA 52336-0035
PO BOX 36, SPRINGVILLE, IA 52336-0036
PO BOX 37, SPRINGVILLE, IA 52336-0037
PO BOX 38, SPRINGVILLE, IA 52336-0038
PO BOX 39, SPRINGVILLE, IA 52336-0039
PO BOX 40, SPRINGVILLE, IA 52336-0040
PO BOX 41, SPRINGVILLE, IA 52336-0041
PO BOX 42, SPRINGVILLE, IA 52336-0042
PO BOX 43, SPRINGVILLE, IA 52336-0043
PO BOX 44, SPRINGVILLE, IA 52336-0044
PO BOX 45, SPRINGVILLE, IA 52336-0045
PO BOX 46, SPRINGVILLE, IA 52336-0046
PO BOX 47, SPRINGVILLE, IA 52336-0047
PO BOX 48, SPRINGVILLE, IA 52336-0048
PO BOX 49, SPRINGVILLE, IA 52336-0049
PO BOX 50, SPRINGVILLE, IA 52336-0050
PO BOX 51, SPRINGVILLE, IA 52336-0051
PO BOX 52, SPRINGVILLE, IA 52336-0052
PO BOX 53, SPRINGVILLE, IA 52336-0053
PO BOX 54, SPRINGVILLE, IA 52336-0054
PO BOX 55, SPRINGVILLE, IA 52336-0055
PO BOX 56, SPRINGVILLE, IA 52336-0056
PO BOX 57, SPRINGVILLE, IA 52336-0057
PO BOX 58, SPRINGVILLE, IA 52336-0058
PO BOX 59, SPRINGVILLE, IA 52336-0059
PO BOX 60, SPRINGVILLE, IA 52336-0060
PO BOX 61, SPRINGVILLE, IA 52336-0061
PO BOX 62, SPRINGVILLE, IA 52336-0062
PO BOX 63, SPRINGVILLE, IA 52336-0063
PO BOX 64, SPRINGVILLE, IA 52336-0064
PO BOX 65, SPRINGVILLE, IA 52336-0065
PO BOX 66, SPRINGVILLE, IA 52336-0066
PO BOX 67, SPRINGVILLE, IA 52336-0067
PO BOX 68, SPRINGVILLE, IA 52336-0068
PO BOX 69, SPRINGVILLE, IA 52336-0069
PO BOX 70, SPRINGVILLE, IA 52336-0070
PO BOX 71, SPRINGVILLE, IA 52336-0071
PO BOX 72, SPRINGVILLE, IA 52336-0072
PO BOX 73, SPRINGVILLE, IA 52336-0073
PO BOX 74, SPRINGVILLE, IA 52336-0074
PO BOX 75, SPRINGVILLE, IA 52336-0075
PO BOX 76, SPRINGVILLE, IA 52336-0076
PO BOX 77, SPRINGVILLE, IA 52336-0077
PO BOX 78, SPRINGVILLE, IA 52336-0078
PO BOX 79, SPRINGVILLE, IA 52336-0079
PO BOX 80, SPRINGVILLE, IA 52336-0080
PO BOX 81, SPRINGVILLE, IA 52336-0081
PO BOX 82, SPRINGVILLE, IA 52336-0082
PO BOX 83, SPRINGVILLE, IA 52336-0083
PO BOX 84, SPRINGVILLE, IA 52336-0084
PO BOX 85, SPRINGVILLE, IA 52336-0085
PO BOX 86, SPRINGVILLE, IA 52336-0086
PO BOX 87, SPRINGVILLE, IA 52336-0087
PO BOX 88, SPRINGVILLE, IA 52336-0088
PO BOX 89, SPRINGVILLE, IA 52336-0089
PO BOX 90, SPRINGVILLE, IA 52336-0090
PO BOX 91, SPRINGVILLE, IA 52336-0091
PO BOX 92, SPRINGVILLE, IA 52336-0092
PO BOX 93, SPRINGVILLE, IA 52336-0093
PO BOX 94, SPRINGVILLE, IA 52336-0094
PO BOX 95, SPRINGVILLE, IA 52336-0095
PO BOX 96, SPRINGVILLE, IA 52336-0096
PO BOX 97, SPRINGVILLE, IA 52336-0097
PO BOX 98, SPRINGVILLE, IA 52336-0098
PO BOX 99, SPRINGVILLE, IA 52336-0099
PO BOX 100, SPRINGVILLE, IA 52336-0100
PO BOX 101, SPRINGVILLE, IA 52336-0101
PO BOX 102, SPRINGVILLE, IA 52336-0102
PO BOX 103, SPRINGVILLE, IA 52336-0103
PO BOX 104, SPRINGVILLE, IA 52336-0104
PO BOX 105, SPRINGVILLE, IA 52336-0105
PO BOX 106, SPRINGVILLE, IA 52336-0106
PO BOX 107, SPRINGVILLE, IA 52336-0107
PO BOX 108, SPRINGVILLE, IA 52336-0108
PO BOX 109, SPRINGVILLE, IA 52336-0109
PO BOX 110, SPRINGVILLE, IA 52336-0110
PO BOX 111, SPRINGVILLE, IA 52336-0111
PO BOX 112, SPRINGVILLE, IA 52336-0112
PO BOX 113, SPRINGVILLE, IA 52336-0113
PO BOX 114, SPRINGVILLE, IA 52336-0114
PO BOX 115, SPRINGVILLE, IA 52336-0115
PO BOX 116, SPRINGVILLE, IA 52336-0116
PO BOX 117, SPRINGVILLE, IA 52336-0117
PO BOX 118, SPRINGVILLE, IA 52336-0118
PO BOX 119, SPRINGVILLE, IA 52336-0119
PO BOX 120, SPRINGVILLE, IA 52336-0120
PO BOX 121, SPRINGVILLE, IA 52336-0121
PO BOX 122, SPRINGVILLE, IA 52336-0122
PO BOX 123, SPRINGVILLE, IA 52336-0123
PO BOX 124, SPRINGVILLE, IA 52336-0124
PO BOX 125, SPRINGVILLE, IA 52336-0125
PO BOX 126, SPRINGVILLE, IA 52336-0126
PO BOX 127, SPRINGVILLE, IA 52336-0127
PO BOX 128, SPRINGVILLE, IA 52336-0128
PO BOX 129, SPRINGVILLE, IA 52336-0129
PO BOX 130, SPRINGVILLE, IA 52336-0130
PO BOX 131, SPRINGVILLE, IA 52336-0131
PO BOX 132, SPRINGVILLE, IA 52336-0132
PO BOX 133, SPRINGVILLE, IA 52336-0133
PO BOX 134, SPRINGVILLE, IA 52336-0134
PO BOX 135, SPRINGVILLE, IA 52336-0135
PO BOX 136, SPRINGVILLE, IA 52336-0136
PO BOX 137, SPRINGVILLE, IA 52336-0137
PO BOX 138, SPRINGVILLE, IA 52336-0138
PO BOX 139, SPRINGVILLE, IA 52336-0139
PO BOX 140, SPRINGVILLE, IA 52336-0140
PO BOX 141, SPRINGVILLE, IA 52336-0141
PO BOX 142, SPRINGVILLE, IA 52336-0142
PO BOX 143, SPRINGVILLE, IA 52336-0143
PO BOX 144, SPRINGVILLE, IA 52336-0144
PO BOX 145, SPRINGVILLE, IA 52336-0145
PO BOX 146, SPRINGVILLE, IA 52336-0146
PO BOX 147, SPRINGVILLE, IA 52336-0147
PO BOX 148, SPRINGVILLE, IA 52336-0148
PO BOX 149, SPRINGVILLE, IA 52336-0149
PO BOX 150, SPRINGVILLE, IA 52336-0150
PO BOX 151, SPRINGVILLE, IA 52336-0151
PO BOX 152, SPRINGVILLE, IA 52336-0152
PO BOX 153, SPRINGVILLE, IA 52336-0153
PO BOX 154, SPRINGVILLE, IA 52336-0154
PO BOX 155, SPRINGVILLE, IA 52336-0155
PO BOX 156, SPRINGVILLE, IA 52336-0156
PO BOX 157, SPRINGVILLE, IA 52336-0157
PO BOX 158, SPRINGVILLE, IA 52336-0158
PO BOX 159, SPRINGVILLE, IA 52336-0159
PO BOX 160, SPRINGVILLE, IA 52336-0160
PO BOX 161, SPRINGVILLE, IA 52336-0161
PO BOX 162, SPRINGVILLE, IA 52336-0162
PO BOX 163, SPRINGVILLE, IA 52336-0163
PO BOX 164, SPRINGVILLE, IA 52336-0164
PO BOX 165, SPRINGVILLE, IA 52336-0165
PO BOX 166, SPRINGVILLE, IA 52336-0166
PO BOX 167, SPRINGVILLE, IA 52336-0167
PO BOX 168, SPRINGVILLE, IA 52336-0168
PO BOX 169, SPRINGVILLE, IA 52336-0169
PO BOX 170, SPRINGVILLE, IA 52336-0170
PO BOX 171, SPRINGVILLE, IA 52336-0171
PO BOX 172, SPRINGVILLE, IA 52336-0172
PO BOX 173, SPRINGVILLE, IA 52336-0173
PO BOX 174, SPRINGVILLE, IA 52336-0174
PO BOX 175, SPRINGVILLE, IA 52336-0175
PO BOX 176, SPRINGVILLE, IA 52336-0176
PO BOX 177, SPRINGVILLE, IA 52336-0177
PO BOX 178, SPRINGVILLE, IA 52336-0178
PO BOX 179, SPRINGVILLE, IA 52336-0179
PO BOX 180, SPRINGVILLE, IA 52336-0180
PO BOX 181, SPRINGVILLE, IA 52336-0181
PO BOX 182, SPRINGVILLE, IA 52336-0182
PO BOX 183, SPRINGVILLE, IA 52336-0183
PO BOX 184, SPRINGVILLE, IA 52336-0184
PO BOX 185, SPRINGVILLE, IA 52336-0185
PO BOX 186, SPRINGVILLE, IA 52336-0186
PO BOX 187, SPRINGVILLE, IA 52336-0187
PO BOX 188, SPRINGVILLE, IA 52336-0188
PO BOX 189, SPRINGVILLE, IA 52336-0189
PO BOX 190, SPRINGVILLE, IA 52336-0190
PO BOX 191, SPRINGVILLE, IA 52336-0191
PO BOX 192, SPRINGVILLE, IA 52336-0192
PO BOX 193, SPRINGVILLE, IA 52336-0193
PO BOX 194, SPRINGVILLE, IA 52336-0194
PO BOX 195, SPRINGVILLE, IA 52336-0195
PO BOX 196, SPRINGVILLE, IA 52336-0196
PO BOX 197, SPRINGVILLE, IA 52336-0197
PO BOX 198, SPRINGVILLE, IA 52336-0198
PO BOX 199, SPRINGVILLE, IA 52336-0199
PO BOX 200, SPRINGVILLE, IA 52336-0200
PO BOX 201, SPRINGVILLE, IA 52336-0201
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