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 21, MARCUS, IA 51035-0021
PO BOX 22, MARCUS, IA 51035-0022
PO BOX 23, MARCUS, IA 51035-0023
PO BOX 24, MARCUS, IA 51035-0024
PO BOX 25, MARCUS, IA 51035-0025
PO BOX 26, MARCUS, IA 51035-0026
PO BOX 27, MARCUS, IA 51035-0027
PO BOX 28, MARCUS, IA 51035-0028
PO BOX 29, MARCUS, IA 51035-0029
PO BOX 30, MARCUS, IA 51035-0030
PO BOX 31, MARCUS, IA 51035-0031
PO BOX 32, MARCUS, IA 51035-0032
PO BOX 33, MARCUS, IA 51035-0033
PO BOX 34, MARCUS, IA 51035-0034
PO BOX 35, MARCUS, IA 51035-0035
PO BOX 36, MARCUS, IA 51035-0036
PO BOX 37, MARCUS, IA 51035-0037
PO BOX 38, MARCUS, IA 51035-0038
PO BOX 39, MARCUS, IA 51035-0039
PO BOX 40, MARCUS, IA 51035-0040
PO BOX 41, MARCUS, IA 51035-0041
PO BOX 42, MARCUS, IA 51035-0042
PO BOX 43, MARCUS, IA 51035-0043
PO BOX 44, MARCUS, IA 51035-0044
PO BOX 45, MARCUS, IA 51035-0045
PO BOX 46, MARCUS, IA 51035-0046
PO BOX 47, MARCUS, IA 51035-0047
PO BOX 48, MARCUS, IA 51035-0048
PO BOX 49, MARCUS, IA 51035-0049
PO BOX 50, MARCUS, IA 51035-0050
PO BOX 51, MARCUS, IA 51035-0051
PO BOX 52, MARCUS, IA 51035-0052
PO BOX 53, MARCUS, IA 51035-0053
PO BOX 54, MARCUS, IA 51035-0054
PO BOX 55, MARCUS, IA 51035-0055
PO BOX 56, MARCUS, IA 51035-0056
PO BOX 57, MARCUS, IA 51035-0057
PO BOX 58, MARCUS, IA 51035-0058
PO BOX 59, MARCUS, IA 51035-0059
PO BOX 60, MARCUS, IA 51035-0060
PO BOX 61, MARCUS, IA 51035-0061
PO BOX 62, MARCUS, IA 51035-0062
PO BOX 63, MARCUS, IA 51035-0063
PO BOX 64, MARCUS, IA 51035-0064
PO BOX 65, MARCUS, IA 51035-0065
PO BOX 66, MARCUS, IA 51035-0066
PO BOX 67, MARCUS, IA 51035-0067
PO BOX 68, MARCUS, IA 51035-0068
PO BOX 69, MARCUS, IA 51035-0069
PO BOX 70, MARCUS, IA 51035-0070
PO BOX 71, MARCUS, IA 51035-0071
PO BOX 72, MARCUS, IA 51035-0072
PO BOX 73, MARCUS, IA 51035-0073
PO BOX 74, MARCUS, IA 51035-0074
PO BOX 75, MARCUS, IA 51035-0075
PO BOX 76, MARCUS, IA 51035-0076
PO BOX 77, MARCUS, IA 51035-0077
PO BOX 78, MARCUS, IA 51035-0078
PO BOX 79, MARCUS, IA 51035-0079
PO BOX 80, MARCUS, IA 51035-0080
PO BOX 81, MARCUS, IA 51035-0081
PO BOX 82, MARCUS, IA 51035-0082
PO BOX 83, MARCUS, IA 51035-0083
PO BOX 84, MARCUS, IA 51035-0084
PO BOX 85, MARCUS, IA 51035-0085
PO BOX 86, MARCUS, IA 51035-0086
PO BOX 87, MARCUS, IA 51035-0087
PO BOX 88, MARCUS, IA 51035-0088
PO BOX 89, MARCUS, IA 51035-0089
PO BOX 90, MARCUS, IA 51035-0090
PO BOX 91, MARCUS, IA 51035-0091
PO BOX 92, MARCUS, IA 51035-0092
PO BOX 93, MARCUS, IA 51035-0093
PO BOX 94, MARCUS, IA 51035-0094
PO BOX 95, MARCUS, IA 51035-0095
PO BOX 96, MARCUS, IA 51035-0096
PO BOX 97, MARCUS, IA 51035-0097
PO BOX 98, MARCUS, IA 51035-0098
PO BOX 99, MARCUS, IA 51035-0099
PO BOX 100, MARCUS, IA 51035-0100
PO BOX 101, MARCUS, IA 51035-0101
PO BOX 102, MARCUS, IA 51035-0102
PO BOX 103, MARCUS, IA 51035-0103
PO BOX 104, MARCUS, IA 51035-0104
PO BOX 105, MARCUS, IA 51035-0105
PO BOX 106, MARCUS, IA 51035-0106
PO BOX 107, MARCUS, IA 51035-0107
PO BOX 108, MARCUS, IA 51035-0108
PO BOX 109, MARCUS, IA 51035-0109
PO BOX 110, MARCUS, IA 51035-0110
PO BOX 111, MARCUS, IA 51035-0111
PO BOX 112, MARCUS, IA 51035-0112
PO BOX 113, MARCUS, IA 51035-0113
PO BOX 114, MARCUS, IA 51035-0114
PO BOX 115, MARCUS, IA 51035-0115
PO BOX 116, MARCUS, IA 51035-0116
PO BOX 117, MARCUS, IA 51035-0117
PO BOX 118, MARCUS, IA 51035-0118
PO BOX 119, MARCUS, IA 51035-0119
PO BOX 120, MARCUS, IA 51035-0120
PO BOX 121, MARCUS, IA 51035-0121
PO BOX 122, MARCUS, IA 51035-0122
PO BOX 123, MARCUS, IA 51035-0123
PO BOX 124, MARCUS, IA 51035-0124
PO BOX 125, MARCUS, IA 51035-0125
PO BOX 126, MARCUS, IA 51035-0126
PO BOX 127, MARCUS, IA 51035-0127
PO BOX 128, MARCUS, IA 51035-0128
PO BOX 129, MARCUS, IA 51035-0129
PO BOX 130, MARCUS, IA 51035-0130
PO BOX 131, MARCUS, IA 51035-0131
PO BOX 132, MARCUS, IA 51035-0132
PO BOX 133, MARCUS, IA 51035-0133
PO BOX 134, MARCUS, IA 51035-0134
PO BOX 135, MARCUS, IA 51035-0135
PO BOX 136, MARCUS, IA 51035-0136
PO BOX 137, MARCUS, IA 51035-0137
PO BOX 138, MARCUS, IA 51035-0138
PO BOX 139, MARCUS, IA 51035-0139
PO BOX 140, MARCUS, IA 51035-0140
PO BOX 141, MARCUS, IA 51035-0141
PO BOX 142, MARCUS, IA 51035-0142
PO BOX 143, MARCUS, IA 51035-0143
PO BOX 144, MARCUS, IA 51035-0144
PO BOX 145, MARCUS, IA 51035-0145
PO BOX 146, MARCUS, IA 51035-0146
PO BOX 147, MARCUS, IA 51035-0147
PO BOX 148, MARCUS, IA 51035-0148
PO BOX 149, MARCUS, IA 51035-0149
PO BOX 150, MARCUS, IA 51035-0150
PO BOX 151, MARCUS, IA 51035-0151
PO BOX 152, MARCUS, IA 51035-0152
PO BOX 153, MARCUS, IA 51035-0153
PO BOX 154, MARCUS, IA 51035-0154
PO BOX 155, MARCUS, IA 51035-0155
PO BOX 156, MARCUS, IA 51035-0156
PO BOX 157, MARCUS, IA 51035-0157
PO BOX 158, MARCUS, IA 51035-0158
PO BOX 159, MARCUS, IA 51035-0159
PO BOX 160, MARCUS, IA 51035-0160
PO BOX 161, MARCUS, IA 51035-0161
PO BOX 162, MARCUS, IA 51035-0162
PO BOX 163, MARCUS, IA 51035-0163
PO BOX 164, MARCUS, IA 51035-0164
PO BOX 165, MARCUS, IA 51035-0165
PO BOX 166, MARCUS, IA 51035-0166
PO BOX 167, MARCUS, IA 51035-0167
PO BOX 168, MARCUS, IA 51035-0168
PO BOX 169, MARCUS, IA 51035-0169
PO BOX 170, MARCUS, IA 51035-0170
PO BOX 171, MARCUS, IA 51035-0171
PO BOX 172, MARCUS, IA 51035-0172
PO BOX 173, MARCUS, IA 51035-0173
PO BOX 174, MARCUS, IA 51035-0174
PO BOX 175, MARCUS, IA 51035-0175
PO BOX 176, MARCUS, IA 51035-0176
PO BOX 177, MARCUS, IA 51035-0177
PO BOX 178, MARCUS, IA 51035-0178
PO BOX 179, MARCUS, IA 51035-0179
PO BOX 180, MARCUS, IA 51035-0180
PO BOX 181, MARCUS, IA 51035-0181
PO BOX 182, MARCUS, IA 51035-0182
PO BOX 183, MARCUS, IA 51035-0183
PO BOX 184, MARCUS, IA 51035-0184
PO BOX 185, MARCUS, IA 51035-0185
PO BOX 186, MARCUS, IA 51035-0186
PO BOX 187, MARCUS, IA 51035-0187
PO BOX 188, MARCUS, IA 51035-0188
PO BOX 189, MARCUS, IA 51035-0189
PO BOX 190, MARCUS, IA 51035-0190
PO BOX 191, MARCUS, IA 51035-0191
PO BOX 192, MARCUS, IA 51035-0192
PO BOX 193, MARCUS, IA 51035-0193
PO BOX 194, MARCUS, IA 51035-0194
PO BOX 195, MARCUS, IA 51035-0195
PO BOX 196, MARCUS, IA 51035-0196
PO BOX 197, MARCUS, IA 51035-0197
PO BOX 198, MARCUS, IA 51035-0198
PO BOX 199, MARCUS, IA 51035-0199
PO BOX 200, MARCUS, IA 51035-0200
PO BOX 201, MARCUS, IA 51035-0201
PO BOX 202, MARCUS, IA 51035-0202
PO BOX 203, MARCUS, IA 51035-0203
PO BOX 204, MARCUS, IA 51035-0204
PO BOX 205, MARCUS, IA 51035-0205
PO BOX 206, MARCUS, IA 51035-0206
PO BOX 207, MARCUS, IA 51035-0207
PO BOX 208, MARCUS, IA 51035-0208
PO BOX 209, MARCUS, IA 51035-0209
PO BOX 210, MARCUS, IA 51035-0210
PO BOX 211, MARCUS, IA 51035-0211
PO BOX 212, MARCUS, IA 51035-0212
PO BOX 213, MARCUS, IA 51035-0213
PO BOX 214, MARCUS, IA 51035-0214
PO BOX 215, MARCUS, IA 51035-0215
PO BOX 216, MARCUS, IA 51035-0216
PO BOX 217, MARCUS, IA 51035-0217
PO BOX 218, MARCUS, IA 51035-0218
PO BOX 219, MARCUS, IA 51035-0219
PO BOX 220, MARCUS, IA 51035-0220
PO BOX 221, MARCUS, IA 51035-0221
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