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, ALBIA, IA 52531-0021
PO BOX 22, ALBIA, IA 52531-0022
PO BOX 23, ALBIA, IA 52531-0023
PO BOX 24, ALBIA, IA 52531-0024
PO BOX 25, ALBIA, IA 52531-0025
PO BOX 26, ALBIA, IA 52531-0026
PO BOX 27, ALBIA, IA 52531-0027
PO BOX 28, ALBIA, IA 52531-0028
PO BOX 29, ALBIA, IA 52531-0029
PO BOX 30, ALBIA, IA 52531-0030
PO BOX 31, ALBIA, IA 52531-0031
PO BOX 32, ALBIA, IA 52531-0032
PO BOX 33, ALBIA, IA 52531-0033
PO BOX 34, ALBIA, IA 52531-0034
PO BOX 35, ALBIA, IA 52531-0035
PO BOX 36, ALBIA, IA 52531-0036
PO BOX 37, ALBIA, IA 52531-0037
PO BOX 38, ALBIA, IA 52531-0038
PO BOX 39, ALBIA, IA 52531-0039
PO BOX 40, ALBIA, IA 52531-0040
PO BOX 41, ALBIA, IA 52531-0041
PO BOX 42, ALBIA, IA 52531-0042
PO BOX 43, ALBIA, IA 52531-0043
PO BOX 44, ALBIA, IA 52531-0044
PO BOX 45, ALBIA, IA 52531-0045
PO BOX 46, ALBIA, IA 52531-0046
PO BOX 47, ALBIA, IA 52531-0047
PO BOX 48, ALBIA, IA 52531-0048
PO BOX 49, ALBIA, IA 52531-0049
PO BOX 50, ALBIA, IA 52531-0050
PO BOX 51, ALBIA, IA 52531-0051
PO BOX 52, ALBIA, IA 52531-0052
PO BOX 53, ALBIA, IA 52531-0053
PO BOX 54, ALBIA, IA 52531-0054
PO BOX 55, ALBIA, IA 52531-0055
PO BOX 56, ALBIA, IA 52531-0056
PO BOX 57, ALBIA, IA 52531-0057
PO BOX 58, ALBIA, IA 52531-0058
PO BOX 59, ALBIA, IA 52531-0059
PO BOX 60, ALBIA, IA 52531-0060
PO BOX 61, ALBIA, IA 52531-0061
PO BOX 62, ALBIA, IA 52531-0062
PO BOX 63, ALBIA, IA 52531-0063
PO BOX 64, ALBIA, IA 52531-0064
PO BOX 65, ALBIA, IA 52531-0065
PO BOX 66, ALBIA, IA 52531-0066
PO BOX 67, ALBIA, IA 52531-0067
PO BOX 68, ALBIA, IA 52531-0068
PO BOX 69, ALBIA, IA 52531-0069
PO BOX 70, ALBIA, IA 52531-0070
PO BOX 71, ALBIA, IA 52531-0071
PO BOX 72, ALBIA, IA 52531-0072
PO BOX 73, ALBIA, IA 52531-0073
PO BOX 74, ALBIA, IA 52531-0074
PO BOX 75, ALBIA, IA 52531-0075
PO BOX 76, ALBIA, IA 52531-0076
PO BOX 77, ALBIA, IA 52531-0077
PO BOX 78, ALBIA, IA 52531-0078
PO BOX 79, ALBIA, IA 52531-0079
PO BOX 80, ALBIA, IA 52531-0080
PO BOX 81, ALBIA, IA 52531-0081
PO BOX 82, ALBIA, IA 52531-0082
PO BOX 83, ALBIA, IA 52531-0083
PO BOX 84, ALBIA, IA 52531-0084
PO BOX 85, ALBIA, IA 52531-0085
PO BOX 86, ALBIA, IA 52531-0086
PO BOX 87, ALBIA, IA 52531-0087
PO BOX 88, ALBIA, IA 52531-0088
PO BOX 89, ALBIA, IA 52531-0089
PO BOX 90, ALBIA, IA 52531-0090
PO BOX 91, ALBIA, IA 52531-0091
PO BOX 92, ALBIA, IA 52531-0092
PO BOX 93, ALBIA, IA 52531-0093
PO BOX 94, ALBIA, IA 52531-0094
PO BOX 95, ALBIA, IA 52531-0095
PO BOX 96, ALBIA, IA 52531-0096
PO BOX 97, ALBIA, IA 52531-0097
PO BOX 98, ALBIA, IA 52531-0098
PO BOX 99, ALBIA, IA 52531-0099
PO BOX 100, ALBIA, IA 52531-0100
PO BOX 101, ALBIA, IA 52531-0101
PO BOX 102, ALBIA, IA 52531-0102
PO BOX 103, ALBIA, IA 52531-0103
PO BOX 104, ALBIA, IA 52531-0104
PO BOX 105, ALBIA, IA 52531-0105
PO BOX 106, ALBIA, IA 52531-0106
PO BOX 107, ALBIA, IA 52531-0107
PO BOX 108, ALBIA, IA 52531-0108
PO BOX 109, ALBIA, IA 52531-0109
PO BOX 110, ALBIA, IA 52531-0110
PO BOX 111, ALBIA, IA 52531-0111
PO BOX 112, ALBIA, IA 52531-0112
PO BOX 113, ALBIA, IA 52531-0113
PO BOX 114, ALBIA, IA 52531-0114
PO BOX 115, ALBIA, IA 52531-0115
PO BOX 116, ALBIA, IA 52531-0116
PO BOX 117, ALBIA, IA 52531-0117
PO BOX 118, ALBIA, IA 52531-0118
PO BOX 119, ALBIA, IA 52531-0119
PO BOX 120, ALBIA, IA 52531-0120
PO BOX 121, ALBIA, IA 52531-0121
PO BOX 122, ALBIA, IA 52531-0122
PO BOX 123, ALBIA, IA 52531-0123
PO BOX 124, ALBIA, IA 52531-0124
PO BOX 125, ALBIA, IA 52531-0125
PO BOX 126, ALBIA, IA 52531-0126
PO BOX 127, ALBIA, IA 52531-0127
PO BOX 128, ALBIA, IA 52531-0128
PO BOX 129, ALBIA, IA 52531-0129
PO BOX 130, ALBIA, IA 52531-0130
PO BOX 131, ALBIA, IA 52531-0131
PO BOX 132, ALBIA, IA 52531-0132
PO BOX 133, ALBIA, IA 52531-0133
PO BOX 134, ALBIA, IA 52531-0134
PO BOX 135, ALBIA, IA 52531-0135
PO BOX 136, ALBIA, IA 52531-0136
PO BOX 137, ALBIA, IA 52531-0137
PO BOX 138, ALBIA, IA 52531-0138
PO BOX 139, ALBIA, IA 52531-0139
PO BOX 140, ALBIA, IA 52531-0140
PO BOX 141, ALBIA, IA 52531-0141
PO BOX 142, ALBIA, IA 52531-0142
PO BOX 143, ALBIA, IA 52531-0143
PO BOX 144, ALBIA, IA 52531-0144
PO BOX 145, ALBIA, IA 52531-0145
PO BOX 146, ALBIA, IA 52531-0146
PO BOX 147, ALBIA, IA 52531-0147
PO BOX 148, ALBIA, IA 52531-0148
PO BOX 149, ALBIA, IA 52531-0149
PO BOX 150, ALBIA, IA 52531-0150
PO BOX 151, ALBIA, IA 52531-0151
PO BOX 152, ALBIA, IA 52531-0152
PO BOX 153, ALBIA, IA 52531-0153
PO BOX 154, ALBIA, IA 52531-0154
PO BOX 155, ALBIA, IA 52531-0155
PO BOX 156, ALBIA, IA 52531-0156
PO BOX 157, ALBIA, IA 52531-0157
PO BOX 158, ALBIA, IA 52531-0158
PO BOX 159, ALBIA, IA 52531-0159
PO BOX 160, ALBIA, IA 52531-0160
PO BOX 161, ALBIA, IA 52531-0161
PO BOX 162, ALBIA, IA 52531-0162
PO BOX 163, ALBIA, IA 52531-0163
PO BOX 164, ALBIA, IA 52531-0164
PO BOX 165, ALBIA, IA 52531-0165
PO BOX 166, ALBIA, IA 52531-0166
PO BOX 167, ALBIA, IA 52531-0167
PO BOX 168, ALBIA, IA 52531-0168
PO BOX 169, ALBIA, IA 52531-0169
PO BOX 170, ALBIA, IA 52531-0170
PO BOX 171, ALBIA, IA 52531-0171
PO BOX 172, ALBIA, IA 52531-0172
PO BOX 173, ALBIA, IA 52531-0173
PO BOX 174, ALBIA, IA 52531-0174
PO BOX 175, ALBIA, IA 52531-0175
PO BOX 176, ALBIA, IA 52531-0176
PO BOX 177, ALBIA, IA 52531-0177
PO BOX 178, ALBIA, IA 52531-0178
PO BOX 179, ALBIA, IA 52531-0179
PO BOX 180, ALBIA, IA 52531-0180
PO BOX 181, ALBIA, IA 52531-0181
PO BOX 182, ALBIA, IA 52531-0182
PO BOX 183, ALBIA, IA 52531-0183
PO BOX 184, ALBIA, IA 52531-0184
PO BOX 185, ALBIA, IA 52531-0185
PO BOX 186, ALBIA, IA 52531-0186
PO BOX 187, ALBIA, IA 52531-0187
PO BOX 188, ALBIA, IA 52531-0188
PO BOX 189, ALBIA, IA 52531-0189
PO BOX 190, ALBIA, IA 52531-0190
PO BOX 191, ALBIA, IA 52531-0191
PO BOX 192, ALBIA, IA 52531-0192
PO BOX 193, ALBIA, IA 52531-0193
PO BOX 194, ALBIA, IA 52531-0194
PO BOX 195, ALBIA, IA 52531-0195
PO BOX 196, ALBIA, IA 52531-0196
PO BOX 197, ALBIA, IA 52531-0197
PO BOX 198, ALBIA, IA 52531-0198
PO BOX 199, ALBIA, IA 52531-0199
PO BOX 200, ALBIA, IA 52531-0200
PO BOX 201, ALBIA, IA 52531-0201
PO BOX 202, ALBIA, IA 52531-0202
PO BOX 203, ALBIA, IA 52531-0203
PO BOX 204, ALBIA, IA 52531-0204
PO BOX 205, ALBIA, IA 52531-0205
PO BOX 206, ALBIA, IA 52531-0206
PO BOX 207, ALBIA, IA 52531-0207
PO BOX 208, ALBIA, IA 52531-0208
PO BOX 209, ALBIA, IA 52531-0209
PO BOX 210, ALBIA, IA 52531-0210
PO BOX 211, ALBIA, IA 52531-0211
PO BOX 212, ALBIA, IA 52531-0212
PO BOX 213, ALBIA, IA 52531-0213
PO BOX 214, ALBIA, IA 52531-0214
PO BOX 215, ALBIA, IA 52531-0215
PO BOX 216, ALBIA, IA 52531-0216
PO BOX 217, ALBIA, IA 52531-0217
PO BOX 218, ALBIA, IA 52531-0218
PO BOX 219, ALBIA, IA 52531-0219
PO BOX 220, ALBIA, IA 52531-0220
PO BOX 221, ALBIA, IA 52531-0221
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