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, SPILLVILLE, IA 52168-0001
PO BOX 2, SPILLVILLE, IA 52168-0002
PO BOX 3, SPILLVILLE, IA 52168-0003
PO BOX 4, SPILLVILLE, IA 52168-0004
PO BOX 5, SPILLVILLE, IA 52168-0005
PO BOX 6, SPILLVILLE, IA 52168-0006
PO BOX 7, SPILLVILLE, IA 52168-0007
PO BOX 8, SPILLVILLE, IA 52168-0008
PO BOX 9, SPILLVILLE, IA 52168-0009
PO BOX 10, SPILLVILLE, IA 52168-0010
PO BOX 11, SPILLVILLE, IA 52168-0011
PO BOX 12, SPILLVILLE, IA 52168-0012
PO BOX 13, SPILLVILLE, IA 52168-0013
PO BOX 14, SPILLVILLE, IA 52168-0014
PO BOX 15, SPILLVILLE, IA 52168-0015
PO BOX 16, SPILLVILLE, IA 52168-0016
PO BOX 17, SPILLVILLE, IA 52168-0017
PO BOX 18, SPILLVILLE, IA 52168-0018
PO BOX 19, SPILLVILLE, IA 52168-0019
PO BOX 20, SPILLVILLE, IA 52168-0020
PO BOX 21, SPILLVILLE, IA 52168-0021
PO BOX 22, SPILLVILLE, IA 52168-0022
PO BOX 23, SPILLVILLE, IA 52168-0023
PO BOX 24, SPILLVILLE, IA 52168-0024
PO BOX 25, SPILLVILLE, IA 52168-0025
PO BOX 26, SPILLVILLE, IA 52168-0026
PO BOX 27, SPILLVILLE, IA 52168-0027
PO BOX 28, SPILLVILLE, IA 52168-0028
PO BOX 29, SPILLVILLE, IA 52168-0029
PO BOX 30, SPILLVILLE, IA 52168-0030
PO BOX 31, SPILLVILLE, IA 52168-0031
PO BOX 32, SPILLVILLE, IA 52168-0032
PO BOX 33, SPILLVILLE, IA 52168-0033
PO BOX 34, SPILLVILLE, IA 52168-0034
PO BOX 35, SPILLVILLE, IA 52168-0035
PO BOX 36, SPILLVILLE, IA 52168-0036
PO BOX 37, SPILLVILLE, IA 52168-0037
PO BOX 38, SPILLVILLE, IA 52168-0038
PO BOX 39, SPILLVILLE, IA 52168-0039
PO BOX 40, SPILLVILLE, IA 52168-0040
PO BOX 41, SPILLVILLE, IA 52168-0041
PO BOX 42, SPILLVILLE, IA 52168-0042
PO BOX 43, SPILLVILLE, IA 52168-0043
PO BOX 44, SPILLVILLE, IA 52168-0044
PO BOX 45, SPILLVILLE, IA 52168-0045
PO BOX 46, SPILLVILLE, IA 52168-0046
PO BOX 47, SPILLVILLE, IA 52168-0047
PO BOX 48, SPILLVILLE, IA 52168-0048
PO BOX 49, SPILLVILLE, IA 52168-0049
PO BOX 50, SPILLVILLE, IA 52168-0050
PO BOX 51, SPILLVILLE, IA 52168-0051
PO BOX 52, SPILLVILLE, IA 52168-0052
PO BOX 53, SPILLVILLE, IA 52168-0053
PO BOX 54, SPILLVILLE, IA 52168-0054
PO BOX 55, SPILLVILLE, IA 52168-0055
PO BOX 56, SPILLVILLE, IA 52168-0056
PO BOX 57, SPILLVILLE, IA 52168-0057
PO BOX 58, SPILLVILLE, IA 52168-0058
PO BOX 59, SPILLVILLE, IA 52168-0059
PO BOX 60, SPILLVILLE, IA 52168-0060
PO BOX 61, SPILLVILLE, IA 52168-0061
PO BOX 62, SPILLVILLE, IA 52168-0062
PO BOX 63, SPILLVILLE, IA 52168-0063
PO BOX 64, SPILLVILLE, IA 52168-0064
PO BOX 65, SPILLVILLE, IA 52168-0065
PO BOX 66, SPILLVILLE, IA 52168-0066
PO BOX 67, SPILLVILLE, IA 52168-0067
PO BOX 68, SPILLVILLE, IA 52168-0068
PO BOX 69, SPILLVILLE, IA 52168-0069
PO BOX 70, SPILLVILLE, IA 52168-0070
PO BOX 71, SPILLVILLE, IA 52168-0071
PO BOX 72, SPILLVILLE, IA 52168-0072
PO BOX 73, SPILLVILLE, IA 52168-0073
PO BOX 74, SPILLVILLE, IA 52168-0074
PO BOX 75, SPILLVILLE, IA 52168-0075
PO BOX 76, SPILLVILLE, IA 52168-0076
PO BOX 77, SPILLVILLE, IA 52168-0077
PO BOX 78, SPILLVILLE, IA 52168-0078
PO BOX 79, SPILLVILLE, IA 52168-0079
PO BOX 80, SPILLVILLE, IA 52168-0080
PO BOX 81, SPILLVILLE, IA 52168-0081
PO BOX 82, SPILLVILLE, IA 52168-0082
PO BOX 83, SPILLVILLE, IA 52168-0083
PO BOX 84, SPILLVILLE, IA 52168-0084
PO BOX 85, SPILLVILLE, IA 52168-0085
PO BOX 86, SPILLVILLE, IA 52168-0086
PO BOX 87, SPILLVILLE, IA 52168-0087
PO BOX 88, SPILLVILLE, IA 52168-0088
PO BOX 89, SPILLVILLE, IA 52168-0089
PO BOX 90, SPILLVILLE, IA 52168-0090
PO BOX 91, SPILLVILLE, IA 52168-0091
PO BOX 92, SPILLVILLE, IA 52168-0092
PO BOX 93, SPILLVILLE, IA 52168-0093
PO BOX 94, SPILLVILLE, IA 52168-0094
PO BOX 95, SPILLVILLE, IA 52168-0095
PO BOX 96, SPILLVILLE, IA 52168-0096
PO BOX 97, SPILLVILLE, IA 52168-0097
PO BOX 98, SPILLVILLE, IA 52168-0098
PO BOX 99, SPILLVILLE, IA 52168-0099
PO BOX 100, SPILLVILLE, IA 52168-0100
PO BOX 101, SPILLVILLE, IA 52168-0101
PO BOX 102, SPILLVILLE, IA 52168-0102
PO BOX 103, SPILLVILLE, IA 52168-0103
PO BOX 104, SPILLVILLE, IA 52168-0104
PO BOX 105, SPILLVILLE, IA 52168-0105
PO BOX 106, SPILLVILLE, IA 52168-0106
PO BOX 107, SPILLVILLE, IA 52168-0107
PO BOX 108, SPILLVILLE, IA 52168-0108
PO BOX 109, SPILLVILLE, IA 52168-0109
PO BOX 110, SPILLVILLE, IA 52168-0110
PO BOX 111, SPILLVILLE, IA 52168-0111
PO BOX 112, SPILLVILLE, IA 52168-0112
PO BOX 113, SPILLVILLE, IA 52168-0113
PO BOX 114, SPILLVILLE, IA 52168-0114
PO BOX 115, SPILLVILLE, IA 52168-0115
PO BOX 116, SPILLVILLE, IA 52168-0116
PO BOX 117, SPILLVILLE, IA 52168-0117
PO BOX 118, SPILLVILLE, IA 52168-0118
PO BOX 119, SPILLVILLE, IA 52168-0119
PO BOX 120, SPILLVILLE, IA 52168-0120
PO BOX 121, SPILLVILLE, IA 52168-0121
PO BOX 122, SPILLVILLE, IA 52168-0122
PO BOX 123, SPILLVILLE, IA 52168-0123
PO BOX 124, SPILLVILLE, IA 52168-0124
PO BOX 125, SPILLVILLE, IA 52168-0125
PO BOX 126, SPILLVILLE, IA 52168-0126
PO BOX 127, SPILLVILLE, IA 52168-0127
PO BOX 128, SPILLVILLE, IA 52168-0128
PO BOX 129, SPILLVILLE, IA 52168-0129
PO BOX 130, SPILLVILLE, IA 52168-0130
PO BOX 131, SPILLVILLE, IA 52168-0131
PO BOX 132, SPILLVILLE, IA 52168-0132
PO BOX 133, SPILLVILLE, IA 52168-0133
PO BOX 134, SPILLVILLE, IA 52168-0134
PO BOX 135, SPILLVILLE, IA 52168-0135
PO BOX 136, SPILLVILLE, IA 52168-0136
PO BOX 137, SPILLVILLE, IA 52168-0137
PO BOX 138, SPILLVILLE, IA 52168-0138
PO BOX 139, SPILLVILLE, IA 52168-0139
PO BOX 140, SPILLVILLE, IA 52168-0140
PO BOX 141, SPILLVILLE, IA 52168-0141
PO BOX 142, SPILLVILLE, IA 52168-0142
PO BOX 143, SPILLVILLE, IA 52168-0143
PO BOX 144, SPILLVILLE, IA 52168-0144
PO BOX 145, SPILLVILLE, IA 52168-0145
PO BOX 146, SPILLVILLE, IA 52168-0146
PO BOX 147, SPILLVILLE, IA 52168-0147
PO BOX 148, SPILLVILLE, IA 52168-0148
PO BOX 149, SPILLVILLE, IA 52168-0149
PO BOX 150, SPILLVILLE, IA 52168-0150
PO BOX 151, SPILLVILLE, IA 52168-0151
PO BOX 152, SPILLVILLE, IA 52168-0152
PO BOX 153, SPILLVILLE, IA 52168-0153
PO BOX 154, SPILLVILLE, IA 52168-0154
PO BOX 155, SPILLVILLE, IA 52168-0155
PO BOX 156, SPILLVILLE, IA 52168-0156
PO BOX 157, SPILLVILLE, IA 52168-0157
PO BOX 158, SPILLVILLE, IA 52168-0158
PO BOX 159, SPILLVILLE, IA 52168-0159
PO BOX 160, SPILLVILLE, IA 52168-0160
PO BOX 161, SPILLVILLE, IA 52168-0161
PO BOX 162, SPILLVILLE, IA 52168-0162
PO BOX 163, SPILLVILLE, IA 52168-0163
PO BOX 164, SPILLVILLE, IA 52168-0164
PO BOX 165, SPILLVILLE, IA 52168-0165
PO BOX 166, SPILLVILLE, IA 52168-0166
PO BOX 167, SPILLVILLE, IA 52168-0167
PO BOX 168, SPILLVILLE, IA 52168-0168
PO BOX 169, SPILLVILLE, IA 52168-0169
PO BOX 170, SPILLVILLE, IA 52168-0170
PO BOX 171, SPILLVILLE, IA 52168-0171
PO BOX 172, SPILLVILLE, IA 52168-0172
PO BOX 173, SPILLVILLE, IA 52168-0173
PO BOX 174, SPILLVILLE, IA 52168-0174
PO BOX 175, SPILLVILLE, IA 52168-0175
PO BOX 176, SPILLVILLE, IA 52168-0176
PO BOX 177, SPILLVILLE, IA 52168-0177
PO BOX 178, SPILLVILLE, IA 52168-0178
PO BOX 179, SPILLVILLE, IA 52168-0179
PO BOX 180, SPILLVILLE, IA 52168-0180
PO BOX 181, SPILLVILLE, IA 52168-0181
PO BOX 182, SPILLVILLE, IA 52168-0182
PO BOX 183, SPILLVILLE, IA 52168-0183
PO BOX 184, SPILLVILLE, IA 52168-0184
PO BOX 185, SPILLVILLE, IA 52168-0185
PO BOX 186, SPILLVILLE, IA 52168-0186
PO BOX 187, SPILLVILLE, IA 52168-0187
PO BOX 188, SPILLVILLE, IA 52168-0188
PO BOX 189, SPILLVILLE, IA 52168-0189
PO BOX 190, SPILLVILLE, IA 52168-0190
PO BOX 191, SPILLVILLE, IA 52168-0191
PO BOX 192, SPILLVILLE, IA 52168-0192
PO BOX 193, SPILLVILLE, IA 52168-0193
PO BOX 194, SPILLVILLE, IA 52168-0194
PO BOX 195, SPILLVILLE, IA 52168-0195
PO BOX 196, SPILLVILLE, IA 52168-0196
PO BOX 197, SPILLVILLE, IA 52168-0197
PO BOX 198, SPILLVILLE, IA 52168-0198
PO BOX 199, SPILLVILLE, IA 52168-0199
PO BOX 200, SPILLVILLE, IA 52168-0200
PO BOX 201, SPILLVILLE, IA 52168-0201
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