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, ALGONA, IA 50511-0001
PO BOX 2, ALGONA, IA 50511-0002
PO BOX 3, ALGONA, IA 50511-0003
PO BOX 4, ALGONA, IA 50511-0004
PO BOX 5, ALGONA, IA 50511-0005
PO BOX 6, ALGONA, IA 50511-0006
PO BOX 7, ALGONA, IA 50511-0007
PO BOX 8, ALGONA, IA 50511-0008
PO BOX 9, ALGONA, IA 50511-0009
PO BOX 10, ALGONA, IA 50511-0010
PO BOX 11, ALGONA, IA 50511-0011
PO BOX 12, ALGONA, IA 50511-0012
PO BOX 13, ALGONA, IA 50511-0013
PO BOX 14, ALGONA, IA 50511-0014
PO BOX 15, ALGONA, IA 50511-0015
PO BOX 16, ALGONA, IA 50511-0016
PO BOX 17, ALGONA, IA 50511-0017
PO BOX 18, ALGONA, IA 50511-0018
PO BOX 19, ALGONA, IA 50511-0019
PO BOX 20, ALGONA, IA 50511-0020
PO BOX 21, ALGONA, IA 50511-0021
PO BOX 22, ALGONA, IA 50511-0022
PO BOX 23, ALGONA, IA 50511-0023
PO BOX 24, ALGONA, IA 50511-0024
PO BOX 25, ALGONA, IA 50511-0025
PO BOX 26, ALGONA, IA 50511-0026
PO BOX 27, ALGONA, IA 50511-0027
PO BOX 28, ALGONA, IA 50511-0028
PO BOX 29, ALGONA, IA 50511-0029
PO BOX 30, ALGONA, IA 50511-0030
PO BOX 31, ALGONA, IA 50511-0031
PO BOX 32, ALGONA, IA 50511-0032
PO BOX 33, ALGONA, IA 50511-0033
PO BOX 34, ALGONA, IA 50511-0034
PO BOX 35, ALGONA, IA 50511-0035
PO BOX 36, ALGONA, IA 50511-0036
PO BOX 37, ALGONA, IA 50511-0037
PO BOX 38, ALGONA, IA 50511-0038
PO BOX 39, ALGONA, IA 50511-0039
PO BOX 40, ALGONA, IA 50511-0040
PO BOX 41, ALGONA, IA 50511-0041
PO BOX 42, ALGONA, IA 50511-0042
PO BOX 43, ALGONA, IA 50511-0043
PO BOX 44, ALGONA, IA 50511-0044
PO BOX 45, ALGONA, IA 50511-0045
PO BOX 46, ALGONA, IA 50511-0046
PO BOX 47, ALGONA, IA 50511-0047
PO BOX 48, ALGONA, IA 50511-0048
PO BOX 49, ALGONA, IA 50511-0049
PO BOX 50, ALGONA, IA 50511-0050
PO BOX 51, ALGONA, IA 50511-0051
PO BOX 52, ALGONA, IA 50511-0052
PO BOX 53, ALGONA, IA 50511-0053
PO BOX 54, ALGONA, IA 50511-0054
PO BOX 55, ALGONA, IA 50511-0055
PO BOX 56, ALGONA, IA 50511-0056
PO BOX 57, ALGONA, IA 50511-0057
PO BOX 58, ALGONA, IA 50511-0058
PO BOX 59, ALGONA, IA 50511-0059
PO BOX 60, ALGONA, IA 50511-0060
PO BOX 61, ALGONA, IA 50511-0061
PO BOX 62, ALGONA, IA 50511-0062
PO BOX 63, ALGONA, IA 50511-0063
PO BOX 64, ALGONA, IA 50511-0064
PO BOX 65, ALGONA, IA 50511-0065
PO BOX 66, ALGONA, IA 50511-0066
PO BOX 67, ALGONA, IA 50511-0067
PO BOX 68, ALGONA, IA 50511-0068
PO BOX 69, ALGONA, IA 50511-0069
PO BOX 70, ALGONA, IA 50511-0070
PO BOX 71, ALGONA, IA 50511-0071
PO BOX 72, ALGONA, IA 50511-0072
PO BOX 73, ALGONA, IA 50511-0073
PO BOX 74, ALGONA, IA 50511-0074
PO BOX 75, ALGONA, IA 50511-0075
PO BOX 76, ALGONA, IA 50511-0076
PO BOX 77, ALGONA, IA 50511-0077
PO BOX 78, ALGONA, IA 50511-0078
PO BOX 79, ALGONA, IA 50511-0079
PO BOX 80, ALGONA, IA 50511-0080
PO BOX 81, ALGONA, IA 50511-0081
PO BOX 82, ALGONA, IA 50511-0082
PO BOX 83, ALGONA, IA 50511-0083
PO BOX 84, ALGONA, IA 50511-0084
PO BOX 85, ALGONA, IA 50511-0085
PO BOX 86, ALGONA, IA 50511-0086
PO BOX 87, ALGONA, IA 50511-0087
PO BOX 88, ALGONA, IA 50511-0088
PO BOX 89, ALGONA, IA 50511-0089
PO BOX 90, ALGONA, IA 50511-0090
PO BOX 91, ALGONA, IA 50511-0091
PO BOX 92, ALGONA, IA 50511-0092
PO BOX 93, ALGONA, IA 50511-0093
PO BOX 94, ALGONA, IA 50511-0094
PO BOX 95, ALGONA, IA 50511-0095
PO BOX 96, ALGONA, IA 50511-0096
PO BOX 97, ALGONA, IA 50511-0097
PO BOX 98, ALGONA, IA 50511-0098
PO BOX 99, ALGONA, IA 50511-0099
PO BOX 100, ALGONA, IA 50511-0100
PO BOX 101, ALGONA, IA 50511-0101
PO BOX 102, ALGONA, IA 50511-0102
PO BOX 103, ALGONA, IA 50511-0103
PO BOX 104, ALGONA, IA 50511-0104
PO BOX 105, ALGONA, IA 50511-0105
PO BOX 106, ALGONA, IA 50511-0106
PO BOX 107, ALGONA, IA 50511-0107
PO BOX 108, ALGONA, IA 50511-0108
PO BOX 109, ALGONA, IA 50511-0109
PO BOX 110, ALGONA, IA 50511-0110
PO BOX 111, ALGONA, IA 50511-0111
PO BOX 112, ALGONA, IA 50511-0112
PO BOX 113, ALGONA, IA 50511-0113
PO BOX 114, ALGONA, IA 50511-0114
PO BOX 115, ALGONA, IA 50511-0115
PO BOX 116, ALGONA, IA 50511-0116
PO BOX 117, ALGONA, IA 50511-0117
PO BOX 118, ALGONA, IA 50511-0118
PO BOX 119, ALGONA, IA 50511-0119
PO BOX 120, ALGONA, IA 50511-0120
PO BOX 121, ALGONA, IA 50511-0121
PO BOX 122, ALGONA, IA 50511-0122
PO BOX 123, ALGONA, IA 50511-0123
PO BOX 124, ALGONA, IA 50511-0124
PO BOX 125, ALGONA, IA 50511-0125
PO BOX 126, ALGONA, IA 50511-0126
PO BOX 127, ALGONA, IA 50511-0127
PO BOX 128, ALGONA, IA 50511-0128
PO BOX 129, ALGONA, IA 50511-0129
PO BOX 130, ALGONA, IA 50511-0130
PO BOX 131, ALGONA, IA 50511-0131
PO BOX 132, ALGONA, IA 50511-0132
PO BOX 133, ALGONA, IA 50511-0133
PO BOX 134, ALGONA, IA 50511-0134
PO BOX 135, ALGONA, IA 50511-0135
PO BOX 136, ALGONA, IA 50511-0136
PO BOX 137, ALGONA, IA 50511-0137
PO BOX 138, ALGONA, IA 50511-0138
PO BOX 139, ALGONA, IA 50511-0139
PO BOX 140, ALGONA, IA 50511-0140
PO BOX 141, ALGONA, IA 50511-0141
PO BOX 142, ALGONA, IA 50511-0142
PO BOX 143, ALGONA, IA 50511-0143
PO BOX 144, ALGONA, IA 50511-0144
PO BOX 145, ALGONA, IA 50511-0145
PO BOX 146, ALGONA, IA 50511-0146
PO BOX 147, ALGONA, IA 50511-0147
PO BOX 148, ALGONA, IA 50511-0148
PO BOX 149, ALGONA, IA 50511-0149
PO BOX 150, ALGONA, IA 50511-0150
PO BOX 151, ALGONA, IA 50511-0151
PO BOX 152, ALGONA, IA 50511-0152
PO BOX 153, ALGONA, IA 50511-0153
PO BOX 154, ALGONA, IA 50511-0154
PO BOX 155, ALGONA, IA 50511-0155
PO BOX 156, ALGONA, IA 50511-0156
PO BOX 157, ALGONA, IA 50511-0157
PO BOX 158, ALGONA, IA 50511-0158
PO BOX 159, ALGONA, IA 50511-0159
PO BOX 160, ALGONA, IA 50511-0160
PO BOX 161, ALGONA, IA 50511-0161
PO BOX 162, ALGONA, IA 50511-0162
PO BOX 163, ALGONA, IA 50511-0163
PO BOX 164, ALGONA, IA 50511-0164
PO BOX 165, ALGONA, IA 50511-0165
PO BOX 166, ALGONA, IA 50511-0166
PO BOX 167, ALGONA, IA 50511-0167
PO BOX 168, ALGONA, IA 50511-0168
PO BOX 169, ALGONA, IA 50511-0169
PO BOX 170, ALGONA, IA 50511-0170
PO BOX 171, ALGONA, IA 50511-0171
PO BOX 172, ALGONA, IA 50511-0172
PO BOX 173, ALGONA, IA 50511-0173
PO BOX 174, ALGONA, IA 50511-0174
PO BOX 175, ALGONA, IA 50511-0175
PO BOX 176, ALGONA, IA 50511-0176
PO BOX 177, ALGONA, IA 50511-0177
PO BOX 178, ALGONA, IA 50511-0178
PO BOX 179, ALGONA, IA 50511-0179
PO BOX 180, ALGONA, IA 50511-0180
PO BOX 181, ALGONA, IA 50511-0181
PO BOX 182, ALGONA, IA 50511-0182
PO BOX 183, ALGONA, IA 50511-0183
PO BOX 184, ALGONA, IA 50511-0184
PO BOX 185, ALGONA, IA 50511-0185
PO BOX 186, ALGONA, IA 50511-0186
PO BOX 187, ALGONA, IA 50511-0187
PO BOX 188, ALGONA, IA 50511-0188
PO BOX 189, ALGONA, IA 50511-0189
PO BOX 190, ALGONA, IA 50511-0190
PO BOX 191, ALGONA, IA 50511-0191
PO BOX 192, ALGONA, IA 50511-0192
PO BOX 193, ALGONA, IA 50511-0193
PO BOX 194, ALGONA, IA 50511-0194
PO BOX 195, ALGONA, IA 50511-0195
PO BOX 196, ALGONA, IA 50511-0196
PO BOX 197, ALGONA, IA 50511-0197
PO BOX 198, ALGONA, IA 50511-0198
PO BOX 199, ALGONA, IA 50511-0199
PO BOX 200, ALGONA, IA 50511-0200
PO BOX 201, ALGONA, IA 50511-0201
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