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, RIVERTON, IA 51650-0001
PO BOX 2, RIVERTON, IA 51650-0002
PO BOX 3, RIVERTON, IA 51650-0003
PO BOX 4, RIVERTON, IA 51650-0004
PO BOX 5, RIVERTON, IA 51650-0005
PO BOX 6, RIVERTON, IA 51650-0006
PO BOX 7, RIVERTON, IA 51650-0007
PO BOX 8, RIVERTON, IA 51650-0008
PO BOX 9, RIVERTON, IA 51650-0009
PO BOX 10, RIVERTON, IA 51650-0010
PO BOX 11, RIVERTON, IA 51650-0011
PO BOX 12, RIVERTON, IA 51650-0012
PO BOX 13, RIVERTON, IA 51650-0013
PO BOX 14, RIVERTON, IA 51650-0014
PO BOX 15, RIVERTON, IA 51650-0015
PO BOX 16, RIVERTON, IA 51650-0016
PO BOX 17, RIVERTON, IA 51650-0017
PO BOX 18, RIVERTON, IA 51650-0018
PO BOX 19, RIVERTON, IA 51650-0019
PO BOX 20, RIVERTON, IA 51650-0020
PO BOX 21, RIVERTON, IA 51650-0021
PO BOX 22, RIVERTON, IA 51650-0022
PO BOX 23, RIVERTON, IA 51650-0023
PO BOX 24, RIVERTON, IA 51650-0024
PO BOX 25, RIVERTON, IA 51650-0025
PO BOX 26, RIVERTON, IA 51650-0026
PO BOX 27, RIVERTON, IA 51650-0027
PO BOX 28, RIVERTON, IA 51650-0028
PO BOX 29, RIVERTON, IA 51650-0029
PO BOX 30, RIVERTON, IA 51650-0030
PO BOX 31, RIVERTON, IA 51650-0031
PO BOX 32, RIVERTON, IA 51650-0032
PO BOX 33, RIVERTON, IA 51650-0033
PO BOX 34, RIVERTON, IA 51650-0034
PO BOX 35, RIVERTON, IA 51650-0035
PO BOX 36, RIVERTON, IA 51650-0036
PO BOX 37, RIVERTON, IA 51650-0037
PO BOX 38, RIVERTON, IA 51650-0038
PO BOX 39, RIVERTON, IA 51650-0039
PO BOX 40, RIVERTON, IA 51650-0040
PO BOX 41, RIVERTON, IA 51650-0041
PO BOX 42, RIVERTON, IA 51650-0042
PO BOX 43, RIVERTON, IA 51650-0043
PO BOX 44, RIVERTON, IA 51650-0044
PO BOX 45, RIVERTON, IA 51650-0045
PO BOX 46, RIVERTON, IA 51650-0046
PO BOX 47, RIVERTON, IA 51650-0047
PO BOX 48, RIVERTON, IA 51650-0048
PO BOX 49, RIVERTON, IA 51650-0049
PO BOX 50, RIVERTON, IA 51650-0050
PO BOX 51, RIVERTON, IA 51650-0051
PO BOX 52, RIVERTON, IA 51650-0052
PO BOX 53, RIVERTON, IA 51650-0053
PO BOX 54, RIVERTON, IA 51650-0054
PO BOX 55, RIVERTON, IA 51650-0055
PO BOX 56, RIVERTON, IA 51650-0056
PO BOX 57, RIVERTON, IA 51650-0057
PO BOX 58, RIVERTON, IA 51650-0058
PO BOX 59, RIVERTON, IA 51650-0059
PO BOX 60, RIVERTON, IA 51650-0060
PO BOX 61, RIVERTON, IA 51650-0061
PO BOX 62, RIVERTON, IA 51650-0062
PO BOX 63, RIVERTON, IA 51650-0063
PO BOX 64, RIVERTON, IA 51650-0064
PO BOX 65, RIVERTON, IA 51650-0065
PO BOX 66, RIVERTON, IA 51650-0066
PO BOX 67, RIVERTON, IA 51650-0067
PO BOX 68, RIVERTON, IA 51650-0068
PO BOX 69, RIVERTON, IA 51650-0069
PO BOX 70, RIVERTON, IA 51650-0070
PO BOX 71, RIVERTON, IA 51650-0071
PO BOX 72, RIVERTON, IA 51650-0072
PO BOX 73, RIVERTON, IA 51650-0073
PO BOX 74, RIVERTON, IA 51650-0074
PO BOX 75, RIVERTON, IA 51650-0075
PO BOX 76, RIVERTON, IA 51650-0076
PO BOX 77, RIVERTON, IA 51650-0077
PO BOX 78, RIVERTON, IA 51650-0078
PO BOX 79, RIVERTON, IA 51650-0079
PO BOX 80, RIVERTON, IA 51650-0080
PO BOX 81, RIVERTON, IA 51650-0081
PO BOX 82, RIVERTON, IA 51650-0082
PO BOX 83, RIVERTON, IA 51650-0083
PO BOX 84, RIVERTON, IA 51650-0084
PO BOX 85, RIVERTON, IA 51650-0085
PO BOX 86, RIVERTON, IA 51650-0086
PO BOX 87, RIVERTON, IA 51650-0087
PO BOX 88, RIVERTON, IA 51650-0088
PO BOX 89, RIVERTON, IA 51650-0089
PO BOX 90, RIVERTON, IA 51650-0090
PO BOX 91, RIVERTON, IA 51650-0091
PO BOX 92, RIVERTON, IA 51650-0092
PO BOX 93, RIVERTON, IA 51650-0093
PO BOX 94, RIVERTON, IA 51650-0094
PO BOX 95, RIVERTON, IA 51650-0095
PO BOX 96, RIVERTON, IA 51650-0096
PO BOX 97, RIVERTON, IA 51650-0097
PO BOX 98, RIVERTON, IA 51650-0098
PO BOX 99, RIVERTON, IA 51650-0099
PO BOX 100, RIVERTON, IA 51650-0100
PO BOX 101, RIVERTON, IA 51650-0101
PO BOX 102, RIVERTON, IA 51650-0102
PO BOX 103, RIVERTON, IA 51650-0103
PO BOX 104, RIVERTON, IA 51650-0104
PO BOX 105, RIVERTON, IA 51650-0105
PO BOX 106, RIVERTON, IA 51650-0106
PO BOX 107, RIVERTON, IA 51650-0107
PO BOX 108, RIVERTON, IA 51650-0108
PO BOX 109, RIVERTON, IA 51650-0109
PO BOX 110, RIVERTON, IA 51650-0110
PO BOX 111, RIVERTON, IA 51650-0111
PO BOX 112, RIVERTON, IA 51650-0112
PO BOX 113, RIVERTON, IA 51650-0113
PO BOX 114, RIVERTON, IA 51650-0114
PO BOX 115, RIVERTON, IA 51650-0115
PO BOX 116, RIVERTON, IA 51650-0116
PO BOX 117, RIVERTON, IA 51650-0117
PO BOX 118, RIVERTON, IA 51650-0118
PO BOX 119, RIVERTON, IA 51650-0119
PO BOX 120, RIVERTON, IA 51650-0120
PO BOX 121, RIVERTON, IA 51650-0121
PO BOX 122, RIVERTON, IA 51650-0122
PO BOX 123, RIVERTON, IA 51650-0123
PO BOX 124, RIVERTON, IA 51650-0124
PO BOX 125, RIVERTON, IA 51650-0125
PO BOX 126, RIVERTON, IA 51650-0126
PO BOX 127, RIVERTON, IA 51650-0127
PO BOX 128, RIVERTON, IA 51650-0128
PO BOX 129, RIVERTON, IA 51650-0129
PO BOX 130, RIVERTON, IA 51650-0130
PO BOX 131, RIVERTON, IA 51650-0131
PO BOX 132, RIVERTON, IA 51650-0132
PO BOX 133, RIVERTON, IA 51650-0133
PO BOX 134, RIVERTON, IA 51650-0134
PO BOX 135, RIVERTON, IA 51650-0135
PO BOX 136, RIVERTON, IA 51650-0136
PO BOX 137, RIVERTON, IA 51650-0137
PO BOX 138, RIVERTON, IA 51650-0138
PO BOX 139, RIVERTON, IA 51650-0139
PO BOX 140, RIVERTON, IA 51650-0140
PO BOX 141, RIVERTON, IA 51650-0141
PO BOX 142, RIVERTON, IA 51650-0142
PO BOX 143, RIVERTON, IA 51650-0143
PO BOX 144, RIVERTON, IA 51650-0144
PO BOX 145, RIVERTON, IA 51650-0145
PO BOX 146, RIVERTON, IA 51650-0146
PO BOX 147, RIVERTON, IA 51650-0147
PO BOX 148, RIVERTON, IA 51650-0148
PO BOX 149, RIVERTON, IA 51650-0149
PO BOX 150, RIVERTON, IA 51650-0150
PO BOX 151, RIVERTON, IA 51650-0151
PO BOX 152, RIVERTON, IA 51650-0152
PO BOX 153, RIVERTON, IA 51650-0153
PO BOX 154, RIVERTON, IA 51650-0154
PO BOX 155, RIVERTON, IA 51650-0155
PO BOX 156, RIVERTON, IA 51650-0156
PO BOX 157, RIVERTON, IA 51650-0157
PO BOX 158, RIVERTON, IA 51650-0158
PO BOX 159, RIVERTON, IA 51650-0159
PO BOX 160, RIVERTON, IA 51650-0160
PO BOX 161, RIVERTON, IA 51650-0161
PO BOX 162, RIVERTON, IA 51650-0162
PO BOX 163, RIVERTON, IA 51650-0163
PO BOX 164, RIVERTON, IA 51650-0164
PO BOX 165, RIVERTON, IA 51650-0165
PO BOX 166, RIVERTON, IA 51650-0166
PO BOX 167, RIVERTON, IA 51650-0167
PO BOX 168, RIVERTON, IA 51650-0168
PO BOX 169, RIVERTON, IA 51650-0169
PO BOX 170, RIVERTON, IA 51650-0170
PO BOX 171, RIVERTON, IA 51650-0171
PO BOX 172, RIVERTON, IA 51650-0172
PO BOX 173, RIVERTON, IA 51650-0173
PO BOX 174, RIVERTON, IA 51650-0174
PO BOX 175, RIVERTON, IA 51650-0175
PO BOX 176, RIVERTON, IA 51650-0176
PO BOX 177, RIVERTON, IA 51650-0177
PO BOX 178, RIVERTON, IA 51650-0178
PO BOX 179, RIVERTON, IA 51650-0179
PO BOX 180, RIVERTON, IA 51650-0180
PO BOX 181, RIVERTON, IA 51650-0181
PO BOX 182, RIVERTON, IA 51650-0182
PO BOX 183, RIVERTON, IA 51650-0183
PO BOX 184, RIVERTON, IA 51650-0184
PO BOX 185, RIVERTON, IA 51650-0185
PO BOX 186, RIVERTON, IA 51650-0186
PO BOX 187, RIVERTON, IA 51650-0187
PO BOX 188, RIVERTON, IA 51650-0188
PO BOX 189, RIVERTON, IA 51650-0189
PO BOX 190, RIVERTON, IA 51650-0190
PO BOX 191, RIVERTON, IA 51650-0191
PO BOX 192, RIVERTON, IA 51650-0192
PO BOX 193, RIVERTON, IA 51650-0193
PO BOX 194, RIVERTON, IA 51650-0194
PO BOX 195, RIVERTON, IA 51650-0195
PO BOX 196, RIVERTON, IA 51650-0196
PO BOX 197, RIVERTON, IA 51650-0197
PO BOX 198, RIVERTON, IA 51650-0198
PO BOX 199, RIVERTON, IA 51650-0199
PO BOX 200, RIVERTON, IA 51650-0200
PO BOX 201, RIVERTON, IA 51650-0201
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