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 10, BARKSDALE AFB, LA 71110-0010
PO BOX 11, BARKSDALE AFB, LA 71110-0011
PO BOX 12, BARKSDALE AFB, LA 71110-0012
PO BOX 13, BARKSDALE AFB, LA 71110-0013
PO BOX 14, BARKSDALE AFB, LA 71110-0014
PO BOX 15, BARKSDALE AFB, LA 71110-0015
PO BOX 16, BARKSDALE AFB, LA 71110-0016
PO BOX 17, BARKSDALE AFB, LA 71110-0017
PO BOX 18, BARKSDALE AFB, LA 71110-0018
PO BOX 19, BARKSDALE AFB, LA 71110-0019
PO BOX 20, BARKSDALE AFB, LA 71110-0020
PO BOX 21, BARKSDALE AFB, LA 71110-0021
PO BOX 22, BARKSDALE AFB, LA 71110-0022
PO BOX 23, BARKSDALE AFB, LA 71110-0023
PO BOX 24, BARKSDALE AFB, LA 71110-0024
PO BOX 25, BARKSDALE AFB, LA 71110-0025
PO BOX 26, BARKSDALE AFB, LA 71110-0026
PO BOX 27, BARKSDALE AFB, LA 71110-0027
PO BOX 28, BARKSDALE AFB, LA 71110-0028
PO BOX 29, BARKSDALE AFB, LA 71110-0029
PO BOX 30, BARKSDALE AFB, LA 71110-0030
PO BOX 31, BARKSDALE AFB, LA 71110-0031
PO BOX 32, BARKSDALE AFB, LA 71110-0032
PO BOX 33, BARKSDALE AFB, LA 71110-0033
PO BOX 34, BARKSDALE AFB, LA 71110-0034
PO BOX 35, BARKSDALE AFB, LA 71110-0035
PO BOX 36, BARKSDALE AFB, LA 71110-0036
PO BOX 37, BARKSDALE AFB, LA 71110-0037
PO BOX 38, BARKSDALE AFB, LA 71110-0038
PO BOX 39, BARKSDALE AFB, LA 71110-0039
PO BOX 40, BARKSDALE AFB, LA 71110-0040
PO BOX 41, BARKSDALE AFB, LA 71110-0041
PO BOX 42, BARKSDALE AFB, LA 71110-0042
PO BOX 43, BARKSDALE AFB, LA 71110-0043
PO BOX 44, BARKSDALE AFB, LA 71110-0044
PO BOX 45, BARKSDALE AFB, LA 71110-0045
PO BOX 46, BARKSDALE AFB, LA 71110-0046
PO BOX 47, BARKSDALE AFB, LA 71110-0047
PO BOX 48, BARKSDALE AFB, LA 71110-0048
PO BOX 49, BARKSDALE AFB, LA 71110-0049
PO BOX 50, BARKSDALE AFB, LA 71110-0050
PO BOX 51, BARKSDALE AFB, LA 71110-0051
PO BOX 52, BARKSDALE AFB, LA 71110-0052
PO BOX 53, BARKSDALE AFB, LA 71110-0053
PO BOX 54, BARKSDALE AFB, LA 71110-0054
PO BOX 55, BARKSDALE AFB, LA 71110-0055
PO BOX 56, BARKSDALE AFB, LA 71110-0056
PO BOX 57, BARKSDALE AFB, LA 71110-0057
PO BOX 58, BARKSDALE AFB, LA 71110-0058
PO BOX 59, BARKSDALE AFB, LA 71110-0059
PO BOX 60, BARKSDALE AFB, LA 71110-0060
PO BOX 61, BARKSDALE AFB, LA 71110-0061
PO BOX 62, BARKSDALE AFB, LA 71110-0062
PO BOX 63, BARKSDALE AFB, LA 71110-0063
PO BOX 64, BARKSDALE AFB, LA 71110-0064
PO BOX 65, BARKSDALE AFB, LA 71110-0065
PO BOX 66, BARKSDALE AFB, LA 71110-0066
PO BOX 67, BARKSDALE AFB, LA 71110-0067
PO BOX 68, BARKSDALE AFB, LA 71110-0068
PO BOX 69, BARKSDALE AFB, LA 71110-0069
PO BOX 70, BARKSDALE AFB, LA 71110-0070
PO BOX 71, BARKSDALE AFB, LA 71110-0071
PO BOX 72, BARKSDALE AFB, LA 71110-0072
PO BOX 73, BARKSDALE AFB, LA 71110-0073
PO BOX 74, BARKSDALE AFB, LA 71110-0074
PO BOX 75, BARKSDALE AFB, LA 71110-0075
PO BOX 76, BARKSDALE AFB, LA 71110-0076
PO BOX 77, BARKSDALE AFB, LA 71110-0077
PO BOX 78, BARKSDALE AFB, LA 71110-0078
PO BOX 79, BARKSDALE AFB, LA 71110-0079
PO BOX 80, BARKSDALE AFB, LA 71110-0080
PO BOX 81, BARKSDALE AFB, LA 71110-0081
PO BOX 82, BARKSDALE AFB, LA 71110-0082
PO BOX 83, BARKSDALE AFB, LA 71110-0083
PO BOX 84, BARKSDALE AFB, LA 71110-0084
PO BOX 85, BARKSDALE AFB, LA 71110-0085
PO BOX 86, BARKSDALE AFB, LA 71110-0086
PO BOX 87, BARKSDALE AFB, LA 71110-0087
PO BOX 88, BARKSDALE AFB, LA 71110-0088
PO BOX 89, BARKSDALE AFB, LA 71110-0089
PO BOX 90, BARKSDALE AFB, LA 71110-0090
PO BOX 91, BARKSDALE AFB, LA 71110-0091
PO BOX 92, BARKSDALE AFB, LA 71110-0092
PO BOX 93, BARKSDALE AFB, LA 71110-0093
PO BOX 94, BARKSDALE AFB, LA 71110-0094
PO BOX 95, BARKSDALE AFB, LA 71110-0095
PO BOX 96, BARKSDALE AFB, LA 71110-0096
PO BOX 97, BARKSDALE AFB, LA 71110-0097
PO BOX 98, BARKSDALE AFB, LA 71110-0098
PO BOX 99, BARKSDALE AFB, LA 71110-0099
PO BOX 100, BARKSDALE AFB, LA 71110-0100
PO BOX 101, BARKSDALE AFB, LA 71110-0101
PO BOX 102, BARKSDALE AFB, LA 71110-0102
PO BOX 103, BARKSDALE AFB, LA 71110-0103
PO BOX 104, BARKSDALE AFB, LA 71110-0104
PO BOX 105, BARKSDALE AFB, LA 71110-0105
PO BOX 106, BARKSDALE AFB, LA 71110-0106
PO BOX 107, BARKSDALE AFB, LA 71110-0107
PO BOX 108, BARKSDALE AFB, LA 71110-0108
PO BOX 109, BARKSDALE AFB, LA 71110-0109
PO BOX 110, BARKSDALE AFB, LA 71110-0110
PO BOX 111, BARKSDALE AFB, LA 71110-0111
PO BOX 112, BARKSDALE AFB, LA 71110-0112
PO BOX 113, BARKSDALE AFB, LA 71110-0113
PO BOX 114, BARKSDALE AFB, LA 71110-0114
PO BOX 115, BARKSDALE AFB, LA 71110-0115
PO BOX 116, BARKSDALE AFB, LA 71110-0116
PO BOX 117, BARKSDALE AFB, LA 71110-0117
PO BOX 118, BARKSDALE AFB, LA 71110-0118
PO BOX 119, BARKSDALE AFB, LA 71110-0119
PO BOX 120, BARKSDALE AFB, LA 71110-0120
PO BOX 121, BARKSDALE AFB, LA 71110-0121
PO BOX 122, BARKSDALE AFB, LA 71110-0122
PO BOX 123, BARKSDALE AFB, LA 71110-0123
PO BOX 124, BARKSDALE AFB, LA 71110-0124
PO BOX 125, BARKSDALE AFB, LA 71110-0125
PO BOX 126, BARKSDALE AFB, LA 71110-0126
PO BOX 127, BARKSDALE AFB, LA 71110-0127
PO BOX 128, BARKSDALE AFB, LA 71110-0128
PO BOX 129, BARKSDALE AFB, LA 71110-0129
PO BOX 130, BARKSDALE AFB, LA 71110-0130
PO BOX 131, BARKSDALE AFB, LA 71110-0131
PO BOX 132, BARKSDALE AFB, LA 71110-0132
PO BOX 133, BARKSDALE AFB, LA 71110-0133
PO BOX 134, BARKSDALE AFB, LA 71110-0134
PO BOX 135, BARKSDALE AFB, LA 71110-0135
PO BOX 136, BARKSDALE AFB, LA 71110-0136
PO BOX 137, BARKSDALE AFB, LA 71110-0137
PO BOX 138, BARKSDALE AFB, LA 71110-0138
PO BOX 139, BARKSDALE AFB, LA 71110-0139
PO BOX 140, BARKSDALE AFB, LA 71110-0140
PO BOX 141, BARKSDALE AFB, LA 71110-0141
PO BOX 142, BARKSDALE AFB, LA 71110-0142
PO BOX 143, BARKSDALE AFB, LA 71110-0143
PO BOX 144, BARKSDALE AFB, LA 71110-0144
PO BOX 145, BARKSDALE AFB, LA 71110-0145
PO BOX 146, BARKSDALE AFB, LA 71110-0146
PO BOX 147, BARKSDALE AFB, LA 71110-0147
PO BOX 148, BARKSDALE AFB, LA 71110-0148
PO BOX 149, BARKSDALE AFB, LA 71110-0149
PO BOX 150, BARKSDALE AFB, LA 71110-0150
PO BOX 151, BARKSDALE AFB, LA 71110-0151
PO BOX 152, BARKSDALE AFB, LA 71110-0152
PO BOX 153, BARKSDALE AFB, LA 71110-0153
PO BOX 154, BARKSDALE AFB, LA 71110-0154
PO BOX 155, BARKSDALE AFB, LA 71110-0155
PO BOX 156, BARKSDALE AFB, LA 71110-0156
PO BOX 157, BARKSDALE AFB, LA 71110-0157
PO BOX 158, BARKSDALE AFB, LA 71110-0158
PO BOX 159, BARKSDALE AFB, LA 71110-0159
PO BOX 160, BARKSDALE AFB, LA 71110-0160
PO BOX 161, BARKSDALE AFB, LA 71110-0161
PO BOX 162, BARKSDALE AFB, LA 71110-0162
PO BOX 163, BARKSDALE AFB, LA 71110-0163
PO BOX 164, BARKSDALE AFB, LA 71110-0164
PO BOX 165, BARKSDALE AFB, LA 71110-0165
PO BOX 166, BARKSDALE AFB, LA 71110-0166
PO BOX 167, BARKSDALE AFB, LA 71110-0167
PO BOX 168, BARKSDALE AFB, LA 71110-0168
PO BOX 169, BARKSDALE AFB, LA 71110-0169
PO BOX 170, BARKSDALE AFB, LA 71110-0170
PO BOX 171, BARKSDALE AFB, LA 71110-0171
PO BOX 172, BARKSDALE AFB, LA 71110-0172
PO BOX 173, BARKSDALE AFB, LA 71110-0173
PO BOX 174, BARKSDALE AFB, LA 71110-0174
PO BOX 175, BARKSDALE AFB, LA 71110-0175
PO BOX 176, BARKSDALE AFB, LA 71110-0176
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