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, BIRMINGHAM, IA 52535-0001
PO BOX 2, BIRMINGHAM, IA 52535-0002
PO BOX 3, BIRMINGHAM, IA 52535-0003
PO BOX 4, BIRMINGHAM, IA 52535-0004
PO BOX 5, BIRMINGHAM, IA 52535-0005
PO BOX 6, BIRMINGHAM, IA 52535-0006
PO BOX 7, BIRMINGHAM, IA 52535-0007
PO BOX 8, BIRMINGHAM, IA 52535-0008
PO BOX 9, BIRMINGHAM, IA 52535-0009
PO BOX 10, BIRMINGHAM, IA 52535-0010
PO BOX 11, BIRMINGHAM, IA 52535-0011
PO BOX 12, BIRMINGHAM, IA 52535-0012
PO BOX 13, BIRMINGHAM, IA 52535-0013
PO BOX 14, BIRMINGHAM, IA 52535-0014
PO BOX 15, BIRMINGHAM, IA 52535-0015
PO BOX 16, BIRMINGHAM, IA 52535-0016
PO BOX 17, BIRMINGHAM, IA 52535-0017
PO BOX 18, BIRMINGHAM, IA 52535-0018
PO BOX 19, BIRMINGHAM, IA 52535-0019
PO BOX 20, BIRMINGHAM, IA 52535-0020
PO BOX 21, BIRMINGHAM, IA 52535-0021
PO BOX 22, BIRMINGHAM, IA 52535-0022
PO BOX 23, BIRMINGHAM, IA 52535-0023
PO BOX 24, BIRMINGHAM, IA 52535-0024
PO BOX 25, BIRMINGHAM, IA 52535-0025
PO BOX 26, BIRMINGHAM, IA 52535-0026
PO BOX 27, BIRMINGHAM, IA 52535-0027
PO BOX 28, BIRMINGHAM, IA 52535-0028
PO BOX 29, BIRMINGHAM, IA 52535-0029
PO BOX 30, BIRMINGHAM, IA 52535-0030
PO BOX 31, BIRMINGHAM, IA 52535-0031
PO BOX 32, BIRMINGHAM, IA 52535-0032
PO BOX 33, BIRMINGHAM, IA 52535-0033
PO BOX 34, BIRMINGHAM, IA 52535-0034
PO BOX 35, BIRMINGHAM, IA 52535-0035
PO BOX 36, BIRMINGHAM, IA 52535-0036
PO BOX 37, BIRMINGHAM, IA 52535-0037
PO BOX 38, BIRMINGHAM, IA 52535-0038
PO BOX 39, BIRMINGHAM, IA 52535-0039
PO BOX 40, BIRMINGHAM, IA 52535-0040
PO BOX 41, BIRMINGHAM, IA 52535-0041
PO BOX 42, BIRMINGHAM, IA 52535-0042
PO BOX 43, BIRMINGHAM, IA 52535-0043
PO BOX 44, BIRMINGHAM, IA 52535-0044
PO BOX 45, BIRMINGHAM, IA 52535-0045
PO BOX 46, BIRMINGHAM, IA 52535-0046
PO BOX 47, BIRMINGHAM, IA 52535-0047
PO BOX 48, BIRMINGHAM, IA 52535-0048
PO BOX 49, BIRMINGHAM, IA 52535-0049
PO BOX 50, BIRMINGHAM, IA 52535-0050
PO BOX 51, BIRMINGHAM, IA 52535-0051
PO BOX 52, BIRMINGHAM, IA 52535-0052
PO BOX 53, BIRMINGHAM, IA 52535-0053
PO BOX 54, BIRMINGHAM, IA 52535-0054
PO BOX 55, BIRMINGHAM, IA 52535-0055
PO BOX 56, BIRMINGHAM, IA 52535-0056
PO BOX 57, BIRMINGHAM, IA 52535-0057
PO BOX 58, BIRMINGHAM, IA 52535-0058
PO BOX 59, BIRMINGHAM, IA 52535-0059
PO BOX 60, BIRMINGHAM, IA 52535-0060
PO BOX 61, BIRMINGHAM, IA 52535-0061
PO BOX 62, BIRMINGHAM, IA 52535-0062
PO BOX 63, BIRMINGHAM, IA 52535-0063
PO BOX 64, BIRMINGHAM, IA 52535-0064
PO BOX 65, BIRMINGHAM, IA 52535-0065
PO BOX 66, BIRMINGHAM, IA 52535-0066
PO BOX 67, BIRMINGHAM, IA 52535-0067
PO BOX 68, BIRMINGHAM, IA 52535-0068
PO BOX 69, BIRMINGHAM, IA 52535-0069
PO BOX 70, BIRMINGHAM, IA 52535-0070
PO BOX 71, BIRMINGHAM, IA 52535-0071
PO BOX 72, BIRMINGHAM, IA 52535-0072
PO BOX 73, BIRMINGHAM, IA 52535-0073
PO BOX 74, BIRMINGHAM, IA 52535-0074
PO BOX 75, BIRMINGHAM, IA 52535-0075
PO BOX 76, BIRMINGHAM, IA 52535-0076
PO BOX 77, BIRMINGHAM, IA 52535-0077
PO BOX 78, BIRMINGHAM, IA 52535-0078
PO BOX 79, BIRMINGHAM, IA 52535-0079
PO BOX 80, BIRMINGHAM, IA 52535-0080
PO BOX 81, BIRMINGHAM, IA 52535-0081
PO BOX 82, BIRMINGHAM, IA 52535-0082
PO BOX 83, BIRMINGHAM, IA 52535-0083
PO BOX 84, BIRMINGHAM, IA 52535-0084
PO BOX 85, BIRMINGHAM, IA 52535-0085
PO BOX 86, BIRMINGHAM, IA 52535-0086
PO BOX 87, BIRMINGHAM, IA 52535-0087
PO BOX 88, BIRMINGHAM, IA 52535-0088
PO BOX 89, BIRMINGHAM, IA 52535-0089
PO BOX 90, BIRMINGHAM, IA 52535-0090
PO BOX 91, BIRMINGHAM, IA 52535-0091
PO BOX 92, BIRMINGHAM, IA 52535-0092
PO BOX 93, BIRMINGHAM, IA 52535-0093
PO BOX 94, BIRMINGHAM, IA 52535-0094
PO BOX 95, BIRMINGHAM, IA 52535-0095
PO BOX 96, BIRMINGHAM, IA 52535-0096
PO BOX 97, BIRMINGHAM, IA 52535-0097
PO BOX 98, BIRMINGHAM, IA 52535-0098
PO BOX 99, BIRMINGHAM, IA 52535-0099
PO BOX 100, BIRMINGHAM, IA 52535-0100
PO BOX 101, BIRMINGHAM, IA 52535-0101
PO BOX 102, BIRMINGHAM, IA 52535-0102
PO BOX 103, BIRMINGHAM, IA 52535-0103
PO BOX 104, BIRMINGHAM, IA 52535-0104
PO BOX 105, BIRMINGHAM, IA 52535-0105
PO BOX 106, BIRMINGHAM, IA 52535-0106
PO BOX 107, BIRMINGHAM, IA 52535-0107
PO BOX 108, BIRMINGHAM, IA 52535-0108
PO BOX 109, BIRMINGHAM, IA 52535-0109
PO BOX 110, BIRMINGHAM, IA 52535-0110
PO BOX 111, BIRMINGHAM, IA 52535-0111
PO BOX 112, BIRMINGHAM, IA 52535-0112
PO BOX 113, BIRMINGHAM, IA 52535-0113
PO BOX 114, BIRMINGHAM, IA 52535-0114
PO BOX 115, BIRMINGHAM, IA 52535-0115
PO BOX 116, BIRMINGHAM, IA 52535-0116
PO BOX 117, BIRMINGHAM, IA 52535-0117
PO BOX 118, BIRMINGHAM, IA 52535-0118
PO BOX 119, BIRMINGHAM, IA 52535-0119
PO BOX 120, BIRMINGHAM, IA 52535-0120
PO BOX 121, BIRMINGHAM, IA 52535-0121
PO BOX 122, BIRMINGHAM, IA 52535-0122
PO BOX 123, BIRMINGHAM, IA 52535-0123
PO BOX 124, BIRMINGHAM, IA 52535-0124
PO BOX 125, BIRMINGHAM, IA 52535-0125
PO BOX 126, BIRMINGHAM, IA 52535-0126
PO BOX 127, BIRMINGHAM, IA 52535-0127
PO BOX 128, BIRMINGHAM, IA 52535-0128
PO BOX 129, BIRMINGHAM, IA 52535-0129
PO BOX 130, BIRMINGHAM, IA 52535-0130
PO BOX 131, BIRMINGHAM, IA 52535-0131
PO BOX 132, BIRMINGHAM, IA 52535-0132
PO BOX 133, BIRMINGHAM, IA 52535-0133
PO BOX 134, BIRMINGHAM, IA 52535-0134
PO BOX 135, BIRMINGHAM, IA 52535-0135
PO BOX 136, BIRMINGHAM, IA 52535-0136
PO BOX 137, BIRMINGHAM, IA 52535-0137
PO BOX 138, BIRMINGHAM, IA 52535-0138
PO BOX 139, BIRMINGHAM, IA 52535-0139
PO BOX 140, BIRMINGHAM, IA 52535-0140
PO BOX 141, BIRMINGHAM, IA 52535-0141
PO BOX 142, BIRMINGHAM, IA 52535-0142
PO BOX 143, BIRMINGHAM, IA 52535-0143
PO BOX 144, BIRMINGHAM, IA 52535-0144
PO BOX 145, BIRMINGHAM, IA 52535-0145
PO BOX 146, BIRMINGHAM, IA 52535-0146
PO BOX 147, BIRMINGHAM, IA 52535-0147
PO BOX 148, BIRMINGHAM, IA 52535-0148
PO BOX 149, BIRMINGHAM, IA 52535-0149
PO BOX 150, BIRMINGHAM, IA 52535-0150
PO BOX 151, BIRMINGHAM, IA 52535-0151
PO BOX 152, BIRMINGHAM, IA 52535-0152
PO BOX 153, BIRMINGHAM, IA 52535-0153
PO BOX 154, BIRMINGHAM, IA 52535-0154
PO BOX 155, BIRMINGHAM, IA 52535-0155
PO BOX 156, BIRMINGHAM, IA 52535-0156
PO BOX 157, BIRMINGHAM, IA 52535-0157
PO BOX 158, BIRMINGHAM, IA 52535-0158
PO BOX 159, BIRMINGHAM, IA 52535-0159
PO BOX 160, BIRMINGHAM, IA 52535-0160
PO BOX 161, BIRMINGHAM, IA 52535-0161
PO BOX 162, BIRMINGHAM, IA 52535-0162
PO BOX 163, BIRMINGHAM, IA 52535-0163
PO BOX 164, BIRMINGHAM, IA 52535-0164
PO BOX 165, BIRMINGHAM, IA 52535-0165
PO BOX 166, BIRMINGHAM, IA 52535-0166
PO BOX 167, BIRMINGHAM, IA 52535-0167
PO BOX 168, BIRMINGHAM, IA 52535-0168
PO BOX 169, BIRMINGHAM, IA 52535-0169
PO BOX 170, BIRMINGHAM, IA 52535-0170
PO BOX 171, BIRMINGHAM, IA 52535-0171
PO BOX 172, BIRMINGHAM, IA 52535-0172
PO BOX 173, BIRMINGHAM, IA 52535-0173
PO BOX 174, BIRMINGHAM, IA 52535-0174
PO BOX 175, BIRMINGHAM, IA 52535-0175
PO BOX 176, BIRMINGHAM, IA 52535-0176
PO BOX 177, BIRMINGHAM, IA 52535-0177
PO BOX 178, BIRMINGHAM, IA 52535-0178
PO BOX 179, BIRMINGHAM, IA 52535-0179
PO BOX 180, BIRMINGHAM, IA 52535-0180
PO BOX 181, BIRMINGHAM, IA 52535-0181
PO BOX 182, BIRMINGHAM, IA 52535-0182
PO BOX 183, BIRMINGHAM, IA 52535-0183
PO BOX 184, BIRMINGHAM, IA 52535-0184
PO BOX 185, BIRMINGHAM, IA 52535-0185
PO BOX 186, BIRMINGHAM, IA 52535-0186
PO BOX 187, BIRMINGHAM, IA 52535-0187
PO BOX 188, BIRMINGHAM, IA 52535-0188
PO BOX 189, BIRMINGHAM, IA 52535-0189
PO BOX 190, BIRMINGHAM, IA 52535-0190
PO BOX 191, BIRMINGHAM, IA 52535-0191
PO BOX 192, BIRMINGHAM, IA 52535-0192
PO BOX 193, BIRMINGHAM, IA 52535-0193
PO BOX 194, BIRMINGHAM, IA 52535-0194
PO BOX 195, BIRMINGHAM, IA 52535-0195
PO BOX 196, BIRMINGHAM, IA 52535-0196
PO BOX 197, BIRMINGHAM, IA 52535-0197
PO BOX 198, BIRMINGHAM, IA 52535-0198
PO BOX 199, BIRMINGHAM, IA 52535-0199
PO BOX 200, BIRMINGHAM, IA 52535-0200
PO BOX 201, BIRMINGHAM, IA 52535-0201
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