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, CALMAR, IA 52132-0001
PO BOX 2, CALMAR, IA 52132-0002
PO BOX 3, CALMAR, IA 52132-0003
PO BOX 4, CALMAR, IA 52132-0004
PO BOX 5, CALMAR, IA 52132-0005
PO BOX 6, CALMAR, IA 52132-0006
PO BOX 7, CALMAR, IA 52132-0007
PO BOX 8, CALMAR, IA 52132-0008
PO BOX 9, CALMAR, IA 52132-0009
PO BOX 10, CALMAR, IA 52132-0010
PO BOX 11, CALMAR, IA 52132-0011
PO BOX 12, CALMAR, IA 52132-0012
PO BOX 13, CALMAR, IA 52132-0013
PO BOX 14, CALMAR, IA 52132-0014
PO BOX 15, CALMAR, IA 52132-0015
PO BOX 16, CALMAR, IA 52132-0016
PO BOX 17, CALMAR, IA 52132-0017
PO BOX 18, CALMAR, IA 52132-0018
PO BOX 19, CALMAR, IA 52132-0019
PO BOX 20, CALMAR, IA 52132-0020
PO BOX 21, CALMAR, IA 52132-0021
PO BOX 22, CALMAR, IA 52132-0022
PO BOX 23, CALMAR, IA 52132-0023
PO BOX 24, CALMAR, IA 52132-0024
PO BOX 25, CALMAR, IA 52132-0025
PO BOX 26, CALMAR, IA 52132-0026
PO BOX 27, CALMAR, IA 52132-0027
PO BOX 28, CALMAR, IA 52132-0028
PO BOX 29, CALMAR, IA 52132-0029
PO BOX 30, CALMAR, IA 52132-0030
PO BOX 31, CALMAR, IA 52132-0031
PO BOX 32, CALMAR, IA 52132-0032
PO BOX 33, CALMAR, IA 52132-0033
PO BOX 34, CALMAR, IA 52132-0034
PO BOX 35, CALMAR, IA 52132-0035
PO BOX 36, CALMAR, IA 52132-0036
PO BOX 37, CALMAR, IA 52132-0037
PO BOX 38, CALMAR, IA 52132-0038
PO BOX 39, CALMAR, IA 52132-0039
PO BOX 40, CALMAR, IA 52132-0040
PO BOX 41, CALMAR, IA 52132-0041
PO BOX 42, CALMAR, IA 52132-0042
PO BOX 43, CALMAR, IA 52132-0043
PO BOX 44, CALMAR, IA 52132-0044
PO BOX 45, CALMAR, IA 52132-0045
PO BOX 46, CALMAR, IA 52132-0046
PO BOX 47, CALMAR, IA 52132-0047
PO BOX 48, CALMAR, IA 52132-0048
PO BOX 49, CALMAR, IA 52132-0049
PO BOX 50, CALMAR, IA 52132-0050
PO BOX 51, CALMAR, IA 52132-0051
PO BOX 52, CALMAR, IA 52132-0052
PO BOX 53, CALMAR, IA 52132-0053
PO BOX 54, CALMAR, IA 52132-0054
PO BOX 55, CALMAR, IA 52132-0055
PO BOX 56, CALMAR, IA 52132-0056
PO BOX 57, CALMAR, IA 52132-0057
PO BOX 58, CALMAR, IA 52132-0058
PO BOX 59, CALMAR, IA 52132-0059
PO BOX 60, CALMAR, IA 52132-0060
PO BOX 61, CALMAR, IA 52132-0061
PO BOX 62, CALMAR, IA 52132-0062
PO BOX 63, CALMAR, IA 52132-0063
PO BOX 64, CALMAR, IA 52132-0064
PO BOX 65, CALMAR, IA 52132-0065
PO BOX 66, CALMAR, IA 52132-0066
PO BOX 67, CALMAR, IA 52132-0067
PO BOX 68, CALMAR, IA 52132-0068
PO BOX 69, CALMAR, IA 52132-0069
PO BOX 70, CALMAR, IA 52132-0070
PO BOX 71, CALMAR, IA 52132-0071
PO BOX 72, CALMAR, IA 52132-0072
PO BOX 73, CALMAR, IA 52132-0073
PO BOX 74, CALMAR, IA 52132-0074
PO BOX 75, CALMAR, IA 52132-0075
PO BOX 76, CALMAR, IA 52132-0076
PO BOX 77, CALMAR, IA 52132-0077
PO BOX 78, CALMAR, IA 52132-0078
PO BOX 79, CALMAR, IA 52132-0079
PO BOX 80, CALMAR, IA 52132-0080
PO BOX 81, CALMAR, IA 52132-0081
PO BOX 82, CALMAR, IA 52132-0082
PO BOX 83, CALMAR, IA 52132-0083
PO BOX 84, CALMAR, IA 52132-0084
PO BOX 85, CALMAR, IA 52132-0085
PO BOX 86, CALMAR, IA 52132-0086
PO BOX 87, CALMAR, IA 52132-0087
PO BOX 88, CALMAR, IA 52132-0088
PO BOX 89, CALMAR, IA 52132-0089
PO BOX 90, CALMAR, IA 52132-0090
PO BOX 91, CALMAR, IA 52132-0091
PO BOX 92, CALMAR, IA 52132-0092
PO BOX 93, CALMAR, IA 52132-0093
PO BOX 94, CALMAR, IA 52132-0094
PO BOX 95, CALMAR, IA 52132-0095
PO BOX 96, CALMAR, IA 52132-0096
PO BOX 97, CALMAR, IA 52132-0097
PO BOX 98, CALMAR, IA 52132-0098
PO BOX 99, CALMAR, IA 52132-0099
PO BOX 100, CALMAR, IA 52132-0100
PO BOX 101, CALMAR, IA 52132-0101
PO BOX 102, CALMAR, IA 52132-0102
PO BOX 103, CALMAR, IA 52132-0103
PO BOX 104, CALMAR, IA 52132-0104
PO BOX 105, CALMAR, IA 52132-0105
PO BOX 106, CALMAR, IA 52132-0106
PO BOX 107, CALMAR, IA 52132-0107
PO BOX 108, CALMAR, IA 52132-0108
PO BOX 109, CALMAR, IA 52132-0109
PO BOX 110, CALMAR, IA 52132-0110
PO BOX 111, CALMAR, IA 52132-0111
PO BOX 112, CALMAR, IA 52132-0112
PO BOX 113, CALMAR, IA 52132-0113
PO BOX 114, CALMAR, IA 52132-0114
PO BOX 115, CALMAR, IA 52132-0115
PO BOX 116, CALMAR, IA 52132-0116
PO BOX 117, CALMAR, IA 52132-0117
PO BOX 118, CALMAR, IA 52132-0118
PO BOX 119, CALMAR, IA 52132-0119
PO BOX 120, CALMAR, IA 52132-0120
PO BOX 121, CALMAR, IA 52132-0121
PO BOX 122, CALMAR, IA 52132-0122
PO BOX 123, CALMAR, IA 52132-0123
PO BOX 124, CALMAR, IA 52132-0124
PO BOX 125, CALMAR, IA 52132-0125
PO BOX 126, CALMAR, IA 52132-0126
PO BOX 127, CALMAR, IA 52132-0127
PO BOX 128, CALMAR, IA 52132-0128
PO BOX 129, CALMAR, IA 52132-0129
PO BOX 130, CALMAR, IA 52132-0130
PO BOX 131, CALMAR, IA 52132-0131
PO BOX 132, CALMAR, IA 52132-0132
PO BOX 133, CALMAR, IA 52132-0133
PO BOX 134, CALMAR, IA 52132-0134
PO BOX 135, CALMAR, IA 52132-0135
PO BOX 136, CALMAR, IA 52132-0136
PO BOX 137, CALMAR, IA 52132-0137
PO BOX 138, CALMAR, IA 52132-0138
PO BOX 139, CALMAR, IA 52132-0139
PO BOX 140, CALMAR, IA 52132-0140
PO BOX 141, CALMAR, IA 52132-0141
PO BOX 142, CALMAR, IA 52132-0142
PO BOX 143, CALMAR, IA 52132-0143
PO BOX 144, CALMAR, IA 52132-0144
PO BOX 145, CALMAR, IA 52132-0145
PO BOX 146, CALMAR, IA 52132-0146
PO BOX 147, CALMAR, IA 52132-0147
PO BOX 148, CALMAR, IA 52132-0148
PO BOX 149, CALMAR, IA 52132-0149
PO BOX 150, CALMAR, IA 52132-0150
PO BOX 151, CALMAR, IA 52132-0151
PO BOX 152, CALMAR, IA 52132-0152
PO BOX 153, CALMAR, IA 52132-0153
PO BOX 154, CALMAR, IA 52132-0154
PO BOX 155, CALMAR, IA 52132-0155
PO BOX 156, CALMAR, IA 52132-0156
PO BOX 157, CALMAR, IA 52132-0157
PO BOX 158, CALMAR, IA 52132-0158
PO BOX 159, CALMAR, IA 52132-0159
PO BOX 160, CALMAR, IA 52132-0160
PO BOX 161, CALMAR, IA 52132-0161
PO BOX 162, CALMAR, IA 52132-0162
PO BOX 163, CALMAR, IA 52132-0163
PO BOX 164, CALMAR, IA 52132-0164
PO BOX 165, CALMAR, IA 52132-0165
PO BOX 166, CALMAR, IA 52132-0166
PO BOX 167, CALMAR, IA 52132-0167
PO BOX 168, CALMAR, IA 52132-0168
PO BOX 169, CALMAR, IA 52132-0169
PO BOX 170, CALMAR, IA 52132-0170
PO BOX 171, CALMAR, IA 52132-0171
PO BOX 172, CALMAR, IA 52132-0172
PO BOX 173, CALMAR, IA 52132-0173
PO BOX 174, CALMAR, IA 52132-0174
PO BOX 175, CALMAR, IA 52132-0175
PO BOX 176, CALMAR, IA 52132-0176
PO BOX 177, CALMAR, IA 52132-0177
PO BOX 178, CALMAR, IA 52132-0178
PO BOX 179, CALMAR, IA 52132-0179
PO BOX 180, CALMAR, IA 52132-0180
PO BOX 181, CALMAR, IA 52132-0181
PO BOX 182, CALMAR, IA 52132-0182
PO BOX 183, CALMAR, IA 52132-0183
PO BOX 184, CALMAR, IA 52132-0184
PO BOX 185, CALMAR, IA 52132-0185
PO BOX 186, CALMAR, IA 52132-0186
PO BOX 187, CALMAR, IA 52132-0187
PO BOX 188, CALMAR, IA 52132-0188
PO BOX 189, CALMAR, IA 52132-0189
PO BOX 190, CALMAR, IA 52132-0190
PO BOX 191, CALMAR, IA 52132-0191
PO BOX 192, CALMAR, IA 52132-0192
PO BOX 193, CALMAR, IA 52132-0193
PO BOX 194, CALMAR, IA 52132-0194
PO BOX 195, CALMAR, IA 52132-0195
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