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, BILLINGSLEY, AL 36006-0001
PO BOX 2, BILLINGSLEY, AL 36006-0002
PO BOX 3, BILLINGSLEY, AL 36006-0003
PO BOX 4, BILLINGSLEY, AL 36006-0004
PO BOX 5, BILLINGSLEY, AL 36006-0005
PO BOX 6, BILLINGSLEY, AL 36006-0006
PO BOX 7, BILLINGSLEY, AL 36006-0007
PO BOX 8, BILLINGSLEY, AL 36006-0008
PO BOX 9, BILLINGSLEY, AL 36006-0009
PO BOX 10, BILLINGSLEY, AL 36006-0010
PO BOX 11, BILLINGSLEY, AL 36006-0011
PO BOX 12, BILLINGSLEY, AL 36006-0012
PO BOX 13, BILLINGSLEY, AL 36006-0013
PO BOX 14, BILLINGSLEY, AL 36006-0014
PO BOX 15, BILLINGSLEY, AL 36006-0015
PO BOX 16, BILLINGSLEY, AL 36006-0016
PO BOX 17, BILLINGSLEY, AL 36006-0017
PO BOX 18, BILLINGSLEY, AL 36006-0018
PO BOX 19, BILLINGSLEY, AL 36006-0019
PO BOX 20, BILLINGSLEY, AL 36006-0020
PO BOX 21, BILLINGSLEY, AL 36006-0021
PO BOX 22, BILLINGSLEY, AL 36006-0022
PO BOX 23, BILLINGSLEY, AL 36006-0023
PO BOX 24, BILLINGSLEY, AL 36006-0024
PO BOX 25, BILLINGSLEY, AL 36006-0025
PO BOX 26, BILLINGSLEY, AL 36006-0026
PO BOX 27, BILLINGSLEY, AL 36006-0027
PO BOX 28, BILLINGSLEY, AL 36006-0028
PO BOX 29, BILLINGSLEY, AL 36006-0029
PO BOX 30, BILLINGSLEY, AL 36006-0030
PO BOX 31, BILLINGSLEY, AL 36006-0031
PO BOX 32, BILLINGSLEY, AL 36006-0032
PO BOX 33, BILLINGSLEY, AL 36006-0033
PO BOX 34, BILLINGSLEY, AL 36006-0034
PO BOX 35, BILLINGSLEY, AL 36006-0035
PO BOX 36, BILLINGSLEY, AL 36006-0036
PO BOX 37, BILLINGSLEY, AL 36006-0037
PO BOX 38, BILLINGSLEY, AL 36006-0038
PO BOX 39, BILLINGSLEY, AL 36006-0039
PO BOX 40, BILLINGSLEY, AL 36006-0040
PO BOX 41, BILLINGSLEY, AL 36006-0041
PO BOX 42, BILLINGSLEY, AL 36006-0042
PO BOX 43, BILLINGSLEY, AL 36006-0043
PO BOX 44, BILLINGSLEY, AL 36006-0044
PO BOX 45, BILLINGSLEY, AL 36006-0045
PO BOX 46, BILLINGSLEY, AL 36006-0046
PO BOX 47, BILLINGSLEY, AL 36006-0047
PO BOX 48, BILLINGSLEY, AL 36006-0048
PO BOX 49, BILLINGSLEY, AL 36006-0049
PO BOX 50, BILLINGSLEY, AL 36006-0050
PO BOX 51, BILLINGSLEY, AL 36006-0051
PO BOX 52, BILLINGSLEY, AL 36006-0052
PO BOX 53, BILLINGSLEY, AL 36006-0053
PO BOX 54, BILLINGSLEY, AL 36006-0054
PO BOX 55, BILLINGSLEY, AL 36006-0055
PO BOX 56, BILLINGSLEY, AL 36006-0056
PO BOX 57, BILLINGSLEY, AL 36006-0057
PO BOX 58, BILLINGSLEY, AL 36006-0058
PO BOX 59, BILLINGSLEY, AL 36006-0059
PO BOX 60, BILLINGSLEY, AL 36006-0060
PO BOX 61, BILLINGSLEY, AL 36006-0061
PO BOX 62, BILLINGSLEY, AL 36006-0062
PO BOX 63, BILLINGSLEY, AL 36006-0063
PO BOX 64, BILLINGSLEY, AL 36006-0064
PO BOX 65, BILLINGSLEY, AL 36006-0065
PO BOX 66, BILLINGSLEY, AL 36006-0066
PO BOX 67, BILLINGSLEY, AL 36006-0067
PO BOX 68, BILLINGSLEY, AL 36006-0068
PO BOX 69, BILLINGSLEY, AL 36006-0069
PO BOX 70, BILLINGSLEY, AL 36006-0070
PO BOX 71, BILLINGSLEY, AL 36006-0071
PO BOX 72, BILLINGSLEY, AL 36006-0072
PO BOX 73, BILLINGSLEY, AL 36006-0073
PO BOX 74, BILLINGSLEY, AL 36006-0074
PO BOX 75, BILLINGSLEY, AL 36006-0075
PO BOX 76, BILLINGSLEY, AL 36006-0076
PO BOX 77, BILLINGSLEY, AL 36006-0077
PO BOX 78, BILLINGSLEY, AL 36006-0078
PO BOX 79, BILLINGSLEY, AL 36006-0079
PO BOX 80, BILLINGSLEY, AL 36006-0080
PO BOX 81, BILLINGSLEY, AL 36006-0081
PO BOX 82, BILLINGSLEY, AL 36006-0082
PO BOX 83, BILLINGSLEY, AL 36006-0083
PO BOX 84, BILLINGSLEY, AL 36006-0084
PO BOX 85, BILLINGSLEY, AL 36006-0085
PO BOX 86, BILLINGSLEY, AL 36006-0086
PO BOX 87, BILLINGSLEY, AL 36006-0087
PO BOX 88, BILLINGSLEY, AL 36006-0088
PO BOX 89, BILLINGSLEY, AL 36006-0089
PO BOX 90, BILLINGSLEY, AL 36006-0090
PO BOX 91, BILLINGSLEY, AL 36006-0091
PO BOX 92, BILLINGSLEY, AL 36006-0092
PO BOX 93, BILLINGSLEY, AL 36006-0093
PO BOX 94, BILLINGSLEY, AL 36006-0094
PO BOX 95, BILLINGSLEY, AL 36006-0095
PO BOX 96, BILLINGSLEY, AL 36006-0096
PO BOX 97, BILLINGSLEY, AL 36006-0097
PO BOX 98, BILLINGSLEY, AL 36006-0098
PO BOX 99, BILLINGSLEY, AL 36006-0099
PO BOX 100, BILLINGSLEY, AL 36006-0100
PO BOX 101, BILLINGSLEY, AL 36006-0101
PO BOX 102, BILLINGSLEY, AL 36006-0102
PO BOX 103, BILLINGSLEY, AL 36006-0103
PO BOX 104, BILLINGSLEY, AL 36006-0104
PO BOX 105, BILLINGSLEY, AL 36006-0105
PO BOX 106, BILLINGSLEY, AL 36006-0106
PO BOX 107, BILLINGSLEY, AL 36006-0107
PO BOX 108, BILLINGSLEY, AL 36006-0108
PO BOX 109, BILLINGSLEY, AL 36006-0109
PO BOX 110, BILLINGSLEY, AL 36006-0110
PO BOX 111, BILLINGSLEY, AL 36006-0111
PO BOX 112, BILLINGSLEY, AL 36006-0112
PO BOX 113, BILLINGSLEY, AL 36006-0113
PO BOX 114, BILLINGSLEY, AL 36006-0114
PO BOX 115, BILLINGSLEY, AL 36006-0115
PO BOX 116, BILLINGSLEY, AL 36006-0116
PO BOX 117, BILLINGSLEY, AL 36006-0117
PO BOX 118, BILLINGSLEY, AL 36006-0118
PO BOX 119, BILLINGSLEY, AL 36006-0119
PO BOX 120, BILLINGSLEY, AL 36006-0120
PO BOX 121, BILLINGSLEY, AL 36006-0121
PO BOX 122, BILLINGSLEY, AL 36006-0122
PO BOX 123, BILLINGSLEY, AL 36006-0123
PO BOX 124, BILLINGSLEY, AL 36006-0124
PO BOX 125, BILLINGSLEY, AL 36006-0125
PO BOX 126, BILLINGSLEY, AL 36006-0126
PO BOX 127, BILLINGSLEY, AL 36006-0127
PO BOX 128, BILLINGSLEY, AL 36006-0128
PO BOX 129, BILLINGSLEY, AL 36006-0129
PO BOX 130, BILLINGSLEY, AL 36006-0130
PO BOX 131, BILLINGSLEY, AL 36006-0131
PO BOX 132, BILLINGSLEY, AL 36006-0132
PO BOX 133, BILLINGSLEY, AL 36006-0133
PO BOX 134, BILLINGSLEY, AL 36006-0134
PO BOX 135, BILLINGSLEY, AL 36006-0135
PO BOX 136, BILLINGSLEY, AL 36006-0136
PO BOX 137, BILLINGSLEY, AL 36006-0137
PO BOX 138, BILLINGSLEY, AL 36006-0138
PO BOX 139, BILLINGSLEY, AL 36006-0139
PO BOX 140, BILLINGSLEY, AL 36006-0140
PO BOX 141, BILLINGSLEY, AL 36006-0141
PO BOX 142, BILLINGSLEY, AL 36006-0142
PO BOX 143, BILLINGSLEY, AL 36006-0143
PO BOX 144, BILLINGSLEY, AL 36006-0144
PO BOX 145, BILLINGSLEY, AL 36006-0145
PO BOX 146, BILLINGSLEY, AL 36006-0146
PO BOX 147, BILLINGSLEY, AL 36006-0147
PO BOX 148, BILLINGSLEY, AL 36006-0148
PO BOX 149, BILLINGSLEY, AL 36006-0149
PO BOX 150, BILLINGSLEY, AL 36006-0150
PO BOX 151, BILLINGSLEY, AL 36006-0151
PO BOX 152, BILLINGSLEY, AL 36006-0152
PO BOX 153, BILLINGSLEY, AL 36006-0153
PO BOX 154, BILLINGSLEY, AL 36006-0154
PO BOX 155, BILLINGSLEY, AL 36006-0155
PO BOX 156, BILLINGSLEY, AL 36006-0156
PO BOX 157, BILLINGSLEY, AL 36006-0157
PO BOX 158, BILLINGSLEY, AL 36006-0158
PO BOX 159, BILLINGSLEY, AL 36006-0159
PO BOX 160, BILLINGSLEY, AL 36006-0160
PO BOX 161, BILLINGSLEY, AL 36006-0161
PO BOX 162, BILLINGSLEY, AL 36006-0162
PO BOX 163, BILLINGSLEY, AL 36006-0163
PO BOX 164, BILLINGSLEY, AL 36006-0164
PO BOX 165, BILLINGSLEY, AL 36006-0165
PO BOX 166, BILLINGSLEY, AL 36006-0166
PO BOX 167, BILLINGSLEY, AL 36006-0167
PO BOX 168, BILLINGSLEY, AL 36006-0168
PO BOX 169, BILLINGSLEY, AL 36006-0169
PO BOX 170, BILLINGSLEY, AL 36006-0170
PO BOX 171, BILLINGSLEY, AL 36006-0171
PO BOX 172, BILLINGSLEY, AL 36006-0172
PO BOX 173, BILLINGSLEY, AL 36006-0173
PO BOX 174, BILLINGSLEY, AL 36006-0174
PO BOX 175, BILLINGSLEY, AL 36006-0175
PO BOX 176, BILLINGSLEY, AL 36006-0176
PO BOX 177, BILLINGSLEY, AL 36006-0177
PO BOX 178, BILLINGSLEY, AL 36006-0178
PO BOX 179, BILLINGSLEY, AL 36006-0179
PO BOX 180, BILLINGSLEY, AL 36006-0180
PO BOX 181, BILLINGSLEY, AL 36006-0181
PO BOX 182, BILLINGSLEY, AL 36006-0182
PO BOX 183, BILLINGSLEY, AL 36006-0183
PO BOX 184, BILLINGSLEY, AL 36006-0184
PO BOX 185, BILLINGSLEY, AL 36006-0185
PO BOX 186, BILLINGSLEY, AL 36006-0186
PO BOX 187, BILLINGSLEY, AL 36006-0187
PO BOX 188, BILLINGSLEY, AL 36006-0188
PO BOX 189, BILLINGSLEY, AL 36006-0189
PO BOX 190, BILLINGSLEY, AL 36006-0190