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, CUMMING, IA 50061-0001
PO BOX 2, CUMMING, IA 50061-0002
PO BOX 3, CUMMING, IA 50061-0003
PO BOX 4, CUMMING, IA 50061-0004
PO BOX 5, CUMMING, IA 50061-0005
PO BOX 6, CUMMING, IA 50061-0006
PO BOX 7, CUMMING, IA 50061-0007
PO BOX 8, CUMMING, IA 50061-0008
PO BOX 9, CUMMING, IA 50061-0009
PO BOX 10, CUMMING, IA 50061-0010
PO BOX 11, CUMMING, IA 50061-0011
PO BOX 12, CUMMING, IA 50061-0012
PO BOX 13, CUMMING, IA 50061-0013
PO BOX 14, CUMMING, IA 50061-0014
PO BOX 15, CUMMING, IA 50061-0015
PO BOX 16, CUMMING, IA 50061-0016
PO BOX 17, CUMMING, IA 50061-0017
PO BOX 18, CUMMING, IA 50061-0018
PO BOX 19, CUMMING, IA 50061-0019
PO BOX 20, CUMMING, IA 50061-0020
PO BOX 21, CUMMING, IA 50061-0021
PO BOX 22, CUMMING, IA 50061-0022
PO BOX 23, CUMMING, IA 50061-0023
PO BOX 24, CUMMING, IA 50061-0024
PO BOX 25, CUMMING, IA 50061-0025
PO BOX 26, CUMMING, IA 50061-0026
PO BOX 27, CUMMING, IA 50061-0027
PO BOX 28, CUMMING, IA 50061-0028
PO BOX 29, CUMMING, IA 50061-0029
PO BOX 30, CUMMING, IA 50061-0030
PO BOX 31, CUMMING, IA 50061-0031
PO BOX 32, CUMMING, IA 50061-0032
PO BOX 33, CUMMING, IA 50061-0033
PO BOX 34, CUMMING, IA 50061-0034
PO BOX 35, CUMMING, IA 50061-0035
PO BOX 36, CUMMING, IA 50061-0036
PO BOX 37, CUMMING, IA 50061-0037
PO BOX 38, CUMMING, IA 50061-0038
PO BOX 39, CUMMING, IA 50061-0039
PO BOX 40, CUMMING, IA 50061-0040
PO BOX 41, CUMMING, IA 50061-0041
PO BOX 42, CUMMING, IA 50061-0042
PO BOX 43, CUMMING, IA 50061-0043
PO BOX 44, CUMMING, IA 50061-0044
PO BOX 45, CUMMING, IA 50061-0045
PO BOX 46, CUMMING, IA 50061-0046
PO BOX 47, CUMMING, IA 50061-0047
PO BOX 48, CUMMING, IA 50061-0048
PO BOX 49, CUMMING, IA 50061-0049
PO BOX 50, CUMMING, IA 50061-0050
PO BOX 51, CUMMING, IA 50061-0051
PO BOX 52, CUMMING, IA 50061-0052
PO BOX 53, CUMMING, IA 50061-0053
PO BOX 54, CUMMING, IA 50061-0054
PO BOX 55, CUMMING, IA 50061-0055
PO BOX 56, CUMMING, IA 50061-0056
PO BOX 57, CUMMING, IA 50061-0057
PO BOX 58, CUMMING, IA 50061-0058
PO BOX 59, CUMMING, IA 50061-0059
PO BOX 60, CUMMING, IA 50061-0060
PO BOX 61, CUMMING, IA 50061-0061
PO BOX 62, CUMMING, IA 50061-0062
PO BOX 63, CUMMING, IA 50061-0063
PO BOX 64, CUMMING, IA 50061-0064
PO BOX 65, CUMMING, IA 50061-0065
PO BOX 66, CUMMING, IA 50061-0066
PO BOX 67, CUMMING, IA 50061-0067
PO BOX 68, CUMMING, IA 50061-0068
PO BOX 69, CUMMING, IA 50061-0069
PO BOX 70, CUMMING, IA 50061-0070
PO BOX 71, CUMMING, IA 50061-0071
PO BOX 72, CUMMING, IA 50061-0072
PO BOX 73, CUMMING, IA 50061-0073
PO BOX 74, CUMMING, IA 50061-0074
PO BOX 75, CUMMING, IA 50061-0075
PO BOX 76, CUMMING, IA 50061-0076
PO BOX 77, CUMMING, IA 50061-0077
PO BOX 78, CUMMING, IA 50061-0078
PO BOX 79, CUMMING, IA 50061-0079
PO BOX 80, CUMMING, IA 50061-0080
PO BOX 81, CUMMING, IA 50061-0081
PO BOX 82, CUMMING, IA 50061-0082
PO BOX 83, CUMMING, IA 50061-0083
PO BOX 84, CUMMING, IA 50061-0084
PO BOX 85, CUMMING, IA 50061-0085
PO BOX 86, CUMMING, IA 50061-0086
PO BOX 87, CUMMING, IA 50061-0087
PO BOX 88, CUMMING, IA 50061-0088
PO BOX 89, CUMMING, IA 50061-0089
PO BOX 90, CUMMING, IA 50061-0090
PO BOX 91, CUMMING, IA 50061-0091
PO BOX 92, CUMMING, IA 50061-0092
PO BOX 93, CUMMING, IA 50061-0093
PO BOX 94, CUMMING, IA 50061-0094
PO BOX 95, CUMMING, IA 50061-0095
PO BOX 96, CUMMING, IA 50061-0096
PO BOX 97, CUMMING, IA 50061-0097
PO BOX 98, CUMMING, IA 50061-0098
PO BOX 99, CUMMING, IA 50061-0099
PO BOX 100, CUMMING, IA 50061-0100
PO BOX 101, CUMMING, IA 50061-0101
PO BOX 102, CUMMING, IA 50061-0102
PO BOX 103, CUMMING, IA 50061-0103
PO BOX 104, CUMMING, IA 50061-0104
PO BOX 105, CUMMING, IA 50061-0105
PO BOX 106, CUMMING, IA 50061-0106
PO BOX 107, CUMMING, IA 50061-0107
PO BOX 108, CUMMING, IA 50061-0108
PO BOX 109, CUMMING, IA 50061-0109
PO BOX 110, CUMMING, IA 50061-0110
PO BOX 111, CUMMING, IA 50061-0111
PO BOX 112, CUMMING, IA 50061-0112
PO BOX 113, CUMMING, IA 50061-0113
PO BOX 114, CUMMING, IA 50061-0114
PO BOX 115, CUMMING, IA 50061-0115
PO BOX 116, CUMMING, IA 50061-0116
PO BOX 117, CUMMING, IA 50061-0117
PO BOX 118, CUMMING, IA 50061-0118
PO BOX 119, CUMMING, IA 50061-0119
PO BOX 120, CUMMING, IA 50061-0120
PO BOX 121, CUMMING, IA 50061-0121
PO BOX 122, CUMMING, IA 50061-0122
PO BOX 123, CUMMING, IA 50061-0123
PO BOX 124, CUMMING, IA 50061-0124
PO BOX 125, CUMMING, IA 50061-0125
PO BOX 126, CUMMING, IA 50061-0126
PO BOX 127, CUMMING, IA 50061-0127
PO BOX 128, CUMMING, IA 50061-0128
PO BOX 129, CUMMING, IA 50061-0129
PO BOX 130, CUMMING, IA 50061-0130
PO BOX 131, CUMMING, IA 50061-0131
PO BOX 132, CUMMING, IA 50061-0132
PO BOX 133, CUMMING, IA 50061-0133
PO BOX 134, CUMMING, IA 50061-0134
PO BOX 135, CUMMING, IA 50061-0135
PO BOX 136, CUMMING, IA 50061-0136
PO BOX 137, CUMMING, IA 50061-0137
PO BOX 138, CUMMING, IA 50061-0138
PO BOX 139, CUMMING, IA 50061-0139
PO BOX 140, CUMMING, IA 50061-0140
PO BOX 141, CUMMING, IA 50061-0141
PO BOX 142, CUMMING, IA 50061-0142
PO BOX 143, CUMMING, IA 50061-0143
PO BOX 144, CUMMING, IA 50061-0144
PO BOX 145, CUMMING, IA 50061-0145
PO BOX 146, CUMMING, IA 50061-0146
PO BOX 147, CUMMING, IA 50061-0147
PO BOX 148, CUMMING, IA 50061-0148
PO BOX 149, CUMMING, IA 50061-0149
PO BOX 150, CUMMING, IA 50061-0150
PO BOX 151, CUMMING, IA 50061-0151
PO BOX 152, CUMMING, IA 50061-0152
PO BOX 153, CUMMING, IA 50061-0153
PO BOX 154, CUMMING, IA 50061-0154
PO BOX 155, CUMMING, IA 50061-0155
PO BOX 156, CUMMING, IA 50061-0156
PO BOX 157, CUMMING, IA 50061-0157
PO BOX 158, CUMMING, IA 50061-0158
PO BOX 159, CUMMING, IA 50061-0159
PO BOX 160, CUMMING, IA 50061-0160
PO BOX 161, CUMMING, IA 50061-0161
PO BOX 162, CUMMING, IA 50061-0162
PO BOX 163, CUMMING, IA 50061-0163
PO BOX 164, CUMMING, IA 50061-0164
PO BOX 165, CUMMING, IA 50061-0165
PO BOX 166, CUMMING, IA 50061-0166
PO BOX 167, CUMMING, IA 50061-0167
PO BOX 168, CUMMING, IA 50061-0168
PO BOX 169, CUMMING, IA 50061-0169
PO BOX 170, CUMMING, IA 50061-0170
PO BOX 171, CUMMING, IA 50061-0171
PO BOX 172, CUMMING, IA 50061-0172
PO BOX 173, CUMMING, IA 50061-0173
PO BOX 174, CUMMING, IA 50061-0174
PO BOX 175, CUMMING, IA 50061-0175
PO BOX 176, CUMMING, IA 50061-0176
PO BOX 177, CUMMING, IA 50061-0177
PO BOX 178, CUMMING, IA 50061-0178
PO BOX 179, CUMMING, IA 50061-0179
PO BOX 180, CUMMING, IA 50061-0180
PO BOX 181, CUMMING, IA 50061-0181
PO BOX 182, CUMMING, IA 50061-0182
PO BOX 183, CUMMING, IA 50061-0183
PO BOX 184, CUMMING, IA 50061-0184
PO BOX 185, CUMMING, IA 50061-0185
PO BOX 186, CUMMING, IA 50061-0186
PO BOX 187, CUMMING, IA 50061-0187
PO BOX 188, CUMMING, IA 50061-0188
PO BOX 189, CUMMING, IA 50061-0189
PO BOX 190, CUMMING, IA 50061-0190
PO BOX 191, CUMMING, IA 50061-0191
PO BOX 192, CUMMING, IA 50061-0192
PO BOX 193, CUMMING, IA 50061-0193
PO BOX 194, CUMMING, IA 50061-0194
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