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, SPENCER, IA 51301-0011
PO BOX 12, SPENCER, IA 51301-0012
PO BOX 13, SPENCER, IA 51301-0013
PO BOX 14, SPENCER, IA 51301-0014
PO BOX 15, SPENCER, IA 51301-0015
PO BOX 16, SPENCER, IA 51301-0016
PO BOX 17, SPENCER, IA 51301-0017
PO BOX 18, SPENCER, IA 51301-0018
PO BOX 19, SPENCER, IA 51301-0019
PO BOX 20, SPENCER, IA 51301-0020
PO BOX 21, SPENCER, IA 51301-0021
PO BOX 22, SPENCER, IA 51301-0022
PO BOX 23, SPENCER, IA 51301-0023
PO BOX 24, SPENCER, IA 51301-0024
PO BOX 25, SPENCER, IA 51301-0025
PO BOX 26, SPENCER, IA 51301-0026
PO BOX 27, SPENCER, IA 51301-0027
PO BOX 28, SPENCER, IA 51301-0028
PO BOX 29, SPENCER, IA 51301-0029
PO BOX 30, SPENCER, IA 51301-0030
PO BOX 31, SPENCER, IA 51301-0031
PO BOX 32, SPENCER, IA 51301-0032
PO BOX 33, SPENCER, IA 51301-0033
PO BOX 34, SPENCER, IA 51301-0034
PO BOX 35, SPENCER, IA 51301-0035
PO BOX 36, SPENCER, IA 51301-0036
PO BOX 37, SPENCER, IA 51301-0037
PO BOX 38, SPENCER, IA 51301-0038
PO BOX 39, SPENCER, IA 51301-0039
PO BOX 40, SPENCER, IA 51301-0040
PO BOX 41, SPENCER, IA 51301-0041
PO BOX 42, SPENCER, IA 51301-0042
PO BOX 43, SPENCER, IA 51301-0043
PO BOX 44, SPENCER, IA 51301-0044
PO BOX 45, SPENCER, IA 51301-0045
PO BOX 46, SPENCER, IA 51301-0046
PO BOX 47, SPENCER, IA 51301-0047
PO BOX 48, SPENCER, IA 51301-0048
PO BOX 49, SPENCER, IA 51301-0049
PO BOX 50, SPENCER, IA 51301-0050
PO BOX 51, SPENCER, IA 51301-0051
PO BOX 52, SPENCER, IA 51301-0052
PO BOX 53, SPENCER, IA 51301-0053
PO BOX 54, SPENCER, IA 51301-0054
PO BOX 55, SPENCER, IA 51301-0055
PO BOX 56, SPENCER, IA 51301-0056
PO BOX 57, SPENCER, IA 51301-0057
PO BOX 58, SPENCER, IA 51301-0058
PO BOX 59, SPENCER, IA 51301-0059
PO BOX 60, SPENCER, IA 51301-0060
PO BOX 61, SPENCER, IA 51301-0061
PO BOX 62, SPENCER, IA 51301-0062
PO BOX 63, SPENCER, IA 51301-0063
PO BOX 64, SPENCER, IA 51301-0064
PO BOX 65, SPENCER, IA 51301-0065
PO BOX 66, SPENCER, IA 51301-0066
PO BOX 67, SPENCER, IA 51301-0067
PO BOX 68, SPENCER, IA 51301-0068
PO BOX 69, SPENCER, IA 51301-0069
PO BOX 70, SPENCER, IA 51301-0070
PO BOX 71, SPENCER, IA 51301-0071
PO BOX 72, SPENCER, IA 51301-0072
PO BOX 73, SPENCER, IA 51301-0073
PO BOX 74, SPENCER, IA 51301-0074
PO BOX 75, SPENCER, IA 51301-0075
PO BOX 76, SPENCER, IA 51301-0076
PO BOX 77, SPENCER, IA 51301-0077
PO BOX 78, SPENCER, IA 51301-0078
PO BOX 79, SPENCER, IA 51301-0079
PO BOX 80, SPENCER, IA 51301-0080
PO BOX 81, SPENCER, IA 51301-0081
PO BOX 82, SPENCER, IA 51301-0082
PO BOX 83, SPENCER, IA 51301-0083
PO BOX 84, SPENCER, IA 51301-0084
PO BOX 85, SPENCER, IA 51301-0085
PO BOX 86, SPENCER, IA 51301-0086
PO BOX 87, SPENCER, IA 51301-0087
PO BOX 88, SPENCER, IA 51301-0088
PO BOX 89, SPENCER, IA 51301-0089
PO BOX 90, SPENCER, IA 51301-0090
PO BOX 91, SPENCER, IA 51301-0091
PO BOX 92, SPENCER, IA 51301-0092
PO BOX 93, SPENCER, IA 51301-0093
PO BOX 94, SPENCER, IA 51301-0094
PO BOX 95, SPENCER, IA 51301-0095
PO BOX 96, SPENCER, IA 51301-0096
PO BOX 97, SPENCER, IA 51301-0097
PO BOX 98, SPENCER, IA 51301-0098
PO BOX 99, SPENCER, IA 51301-0099
PO BOX 100, SPENCER, IA 51301-0100
PO BOX 101, SPENCER, IA 51301-0101
PO BOX 102, SPENCER, IA 51301-0102
PO BOX 103, SPENCER, IA 51301-0103
PO BOX 104, SPENCER, IA 51301-0104
PO BOX 105, SPENCER, IA 51301-0105
PO BOX 106, SPENCER, IA 51301-0106
PO BOX 107, SPENCER, IA 51301-0107
PO BOX 108, SPENCER, IA 51301-0108
PO BOX 109, SPENCER, IA 51301-0109
PO BOX 110, SPENCER, IA 51301-0110
PO BOX 111, SPENCER, IA 51301-0111
PO BOX 112, SPENCER, IA 51301-0112
PO BOX 113, SPENCER, IA 51301-0113
PO BOX 114, SPENCER, IA 51301-0114
PO BOX 115, SPENCER, IA 51301-0115
PO BOX 116, SPENCER, IA 51301-0116
PO BOX 117, SPENCER, IA 51301-0117
PO BOX 118, SPENCER, IA 51301-0118
PO BOX 119, SPENCER, IA 51301-0119
PO BOX 120, SPENCER, IA 51301-0120
PO BOX 121, SPENCER, IA 51301-0121
PO BOX 122, SPENCER, IA 51301-0122
PO BOX 123, SPENCER, IA 51301-0123
PO BOX 124, SPENCER, IA 51301-0124
PO BOX 125, SPENCER, IA 51301-0125
PO BOX 126, SPENCER, IA 51301-0126
PO BOX 127, SPENCER, IA 51301-0127
PO BOX 128, SPENCER, IA 51301-0128
PO BOX 129, SPENCER, IA 51301-0129
PO BOX 130, SPENCER, IA 51301-0130
PO BOX 131, SPENCER, IA 51301-0131
PO BOX 132, SPENCER, IA 51301-0132
PO BOX 133, SPENCER, IA 51301-0133
PO BOX 134, SPENCER, IA 51301-0134
PO BOX 135, SPENCER, IA 51301-0135
PO BOX 136, SPENCER, IA 51301-0136
PO BOX 137, SPENCER, IA 51301-0137
PO BOX 138, SPENCER, IA 51301-0138
PO BOX 139, SPENCER, IA 51301-0139
PO BOX 140, SPENCER, IA 51301-0140
PO BOX 141, SPENCER, IA 51301-0141
PO BOX 142, SPENCER, IA 51301-0142
PO BOX 143, SPENCER, IA 51301-0143
PO BOX 144, SPENCER, IA 51301-0144
PO BOX 145, SPENCER, IA 51301-0145
PO BOX 146, SPENCER, IA 51301-0146
PO BOX 147, SPENCER, IA 51301-0147
PO BOX 148, SPENCER, IA 51301-0148
PO BOX 149, SPENCER, IA 51301-0149
PO BOX 150, SPENCER, IA 51301-0150
PO BOX 151, SPENCER, IA 51301-0151
PO BOX 152, SPENCER, IA 51301-0152
PO BOX 153, SPENCER, IA 51301-0153
PO BOX 154, SPENCER, IA 51301-0154
PO BOX 155, SPENCER, IA 51301-0155
PO BOX 156, SPENCER, IA 51301-0156
PO BOX 157, SPENCER, IA 51301-0157
PO BOX 158, SPENCER, IA 51301-0158
PO BOX 159, SPENCER, IA 51301-0159
PO BOX 160, SPENCER, IA 51301-0160
PO BOX 161, SPENCER, IA 51301-0161
PO BOX 162, SPENCER, IA 51301-0162
PO BOX 163, SPENCER, IA 51301-0163
PO BOX 164, SPENCER, IA 51301-0164
PO BOX 165, SPENCER, IA 51301-0165
PO BOX 166, SPENCER, IA 51301-0166
PO BOX 167, SPENCER, IA 51301-0167
PO BOX 168, SPENCER, IA 51301-0168
PO BOX 169, SPENCER, IA 51301-0169
PO BOX 170, SPENCER, IA 51301-0170
PO BOX 171, SPENCER, IA 51301-0171
PO BOX 172, SPENCER, IA 51301-0172
PO BOX 173, SPENCER, IA 51301-0173
PO BOX 174, SPENCER, IA 51301-0174
PO BOX 175, SPENCER, IA 51301-0175
PO BOX 176, SPENCER, IA 51301-0176
PO BOX 177, SPENCER, IA 51301-0177
PO BOX 178, SPENCER, IA 51301-0178
PO BOX 179, SPENCER, IA 51301-0179
PO BOX 180, SPENCER, IA 51301-0180
PO BOX 181, SPENCER, IA 51301-0181
PO BOX 182, SPENCER, IA 51301-0182
PO BOX 183, SPENCER, IA 51301-0183
PO BOX 184, SPENCER, IA 51301-0184
PO BOX 185, SPENCER, IA 51301-0185
PO BOX 186, SPENCER, IA 51301-0186
PO BOX 187, SPENCER, IA 51301-0187
PO BOX 188, SPENCER, IA 51301-0188
PO BOX 189, SPENCER, IA 51301-0189
PO BOX 190, SPENCER, IA 51301-0190
PO BOX 191, SPENCER, IA 51301-0191
PO BOX 192, SPENCER, IA 51301-0192
PO BOX 193, SPENCER, IA 51301-0193
PO BOX 194, SPENCER, IA 51301-0194
PO BOX 195, SPENCER, IA 51301-0195
PO BOX 196, SPENCER, IA 51301-0196
PO BOX 197, SPENCER, IA 51301-0197
PO BOX 198, SPENCER, IA 51301-0198
PO BOX 199, SPENCER, IA 51301-0199
PO BOX 200, SPENCER, IA 51301-0200
PO BOX 201, SPENCER, IA 51301-0201
PO BOX 202, SPENCER, IA 51301-0202
PO BOX 203, SPENCER, IA 51301-0203
PO BOX 204, SPENCER, IA 51301-0204
PO BOX 205, SPENCER, IA 51301-0205
PO BOX 206, SPENCER, IA 51301-0206
PO BOX 207, SPENCER, IA 51301-0207
PO BOX 208, SPENCER, IA 51301-0208
PO BOX 209, SPENCER, IA 51301-0209
PO BOX 210, SPENCER, IA 51301-0210
PO BOX 211, SPENCER, IA 51301-0211
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