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 11, BURBANK, CA 91503-0011
PO BOX 12, BURBANK, CA 91503-0012
PO BOX 13, BURBANK, CA 91503-0013
PO BOX 14, BURBANK, CA 91503-0014
PO BOX 15, BURBANK, CA 91503-0015
PO BOX 16, BURBANK, CA 91503-0016
PO BOX 17, BURBANK, CA 91503-0017
PO BOX 18, BURBANK, CA 91503-0018
PO BOX 19, BURBANK, CA 91503-0019
PO BOX 20, BURBANK, CA 91503-0020
PO BOX 21, BURBANK, CA 91503-0021
PO BOX 22, BURBANK, CA 91503-0022
PO BOX 23, BURBANK, CA 91503-0023
PO BOX 24, BURBANK, CA 91503-0024
PO BOX 25, BURBANK, CA 91503-0025
PO BOX 26, BURBANK, CA 91503-0026
PO BOX 27, BURBANK, CA 91503-0027
PO BOX 28, BURBANK, CA 91503-0028
PO BOX 29, BURBANK, CA 91503-0029
PO BOX 30, BURBANK, CA 91503-0030
PO BOX 31, BURBANK, CA 91503-0031
PO BOX 32, BURBANK, CA 91503-0032
PO BOX 33, BURBANK, CA 91503-0033
PO BOX 34, BURBANK, CA 91503-0034
PO BOX 35, BURBANK, CA 91503-0035
PO BOX 36, BURBANK, CA 91503-0036
PO BOX 37, BURBANK, CA 91503-0037
PO BOX 38, BURBANK, CA 91503-0038
PO BOX 39, BURBANK, CA 91503-0039
PO BOX 40, BURBANK, CA 91503-0040
PO BOX 41, BURBANK, CA 91503-0041
PO BOX 42, BURBANK, CA 91503-0042
PO BOX 43, BURBANK, CA 91503-0043
PO BOX 44, BURBANK, CA 91503-0044
PO BOX 45, BURBANK, CA 91503-0045
PO BOX 46, BURBANK, CA 91503-0046
PO BOX 47, BURBANK, CA 91503-0047
PO BOX 48, BURBANK, CA 91503-0048
PO BOX 49, BURBANK, CA 91503-0049
PO BOX 50, BURBANK, CA 91503-0050
PO BOX 51, BURBANK, CA 91503-0051
PO BOX 52, BURBANK, CA 91503-0052
PO BOX 53, BURBANK, CA 91503-0053
PO BOX 54, BURBANK, CA 91503-0054
PO BOX 55, BURBANK, CA 91503-0055
PO BOX 56, BURBANK, CA 91503-0056
PO BOX 57, BURBANK, CA 91503-0057
PO BOX 58, BURBANK, CA 91503-0058
PO BOX 59, BURBANK, CA 91503-0059
PO BOX 60, BURBANK, CA 91503-0060
PO BOX 61, BURBANK, CA 91503-0061
PO BOX 62, BURBANK, CA 91503-0062
PO BOX 63, BURBANK, CA 91503-0063
PO BOX 64, BURBANK, CA 91503-0064
PO BOX 65, BURBANK, CA 91503-0065
PO BOX 66, BURBANK, CA 91503-0066
PO BOX 67, BURBANK, CA 91503-0067
PO BOX 68, BURBANK, CA 91503-0068
PO BOX 69, BURBANK, CA 91503-0069
PO BOX 70, BURBANK, CA 91503-0070
PO BOX 71, BURBANK, CA 91503-0071
PO BOX 72, BURBANK, CA 91503-0072
PO BOX 73, BURBANK, CA 91503-0073
PO BOX 74, BURBANK, CA 91503-0074
PO BOX 75, BURBANK, CA 91503-0075
PO BOX 76, BURBANK, CA 91503-0076
PO BOX 77, BURBANK, CA 91503-0077
PO BOX 78, BURBANK, CA 91503-0078
PO BOX 79, BURBANK, CA 91503-0079
PO BOX 80, BURBANK, CA 91503-0080
PO BOX 81, BURBANK, CA 91503-0081
PO BOX 82, BURBANK, CA 91503-0082
PO BOX 83, BURBANK, CA 91503-0083
PO BOX 84, BURBANK, CA 91503-0084
PO BOX 85, BURBANK, CA 91503-0085
PO BOX 86, BURBANK, CA 91503-0086
PO BOX 87, BURBANK, CA 91503-0087
PO BOX 88, BURBANK, CA 91503-0088
PO BOX 89, BURBANK, CA 91503-0089
PO BOX 90, BURBANK, CA 91503-0090
PO BOX 91, BURBANK, CA 91503-0091
PO BOX 92, BURBANK, CA 91503-0092
PO BOX 93, BURBANK, CA 91503-0093
PO BOX 94, BURBANK, CA 91503-0094
PO BOX 95, BURBANK, CA 91503-0095
PO BOX 96, BURBANK, CA 91503-0096
PO BOX 97, BURBANK, CA 91503-0097
PO BOX 98, BURBANK, CA 91503-0098
PO BOX 99, BURBANK, CA 91503-0099
PO BOX 100, BURBANK, CA 91503-0100
PO BOX 101, BURBANK, CA 91503-0101
PO BOX 102, BURBANK, CA 91503-0102
PO BOX 103, BURBANK, CA 91503-0103
PO BOX 104, BURBANK, CA 91503-0104
PO BOX 105, BURBANK, CA 91503-0105
PO BOX 106, BURBANK, CA 91503-0106
PO BOX 107, BURBANK, CA 91503-0107
PO BOX 108, BURBANK, CA 91503-0108
PO BOX 109, BURBANK, CA 91503-0109
PO BOX 110, BURBANK, CA 91503-0110
PO BOX 111, BURBANK, CA 91503-0111
PO BOX 112, BURBANK, CA 91503-0112
PO BOX 113, BURBANK, CA 91503-0113
PO BOX 114, BURBANK, CA 91503-0114
PO BOX 115, BURBANK, CA 91503-0115
PO BOX 116, BURBANK, CA 91503-0116
PO BOX 117, BURBANK, CA 91503-0117
PO BOX 118, BURBANK, CA 91503-0118
PO BOX 119, BURBANK, CA 91503-0119
PO BOX 120, BURBANK, CA 91503-0120
PO BOX 121, BURBANK, CA 91503-0121
PO BOX 122, BURBANK, CA 91503-0122
PO BOX 123, BURBANK, CA 91503-0123
PO BOX 124, BURBANK, CA 91503-0124
PO BOX 125, BURBANK, CA 91503-0125
PO BOX 126, BURBANK, CA 91503-0126
PO BOX 127, BURBANK, CA 91503-0127
PO BOX 128, BURBANK, CA 91503-0128
PO BOX 129, BURBANK, CA 91503-0129
PO BOX 130, BURBANK, CA 91503-0130
PO BOX 131, BURBANK, CA 91503-0131
PO BOX 132, BURBANK, CA 91503-0132
PO BOX 133, BURBANK, CA 91503-0133
PO BOX 134, BURBANK, CA 91503-0134
PO BOX 135, BURBANK, CA 91503-0135
PO BOX 136, BURBANK, CA 91503-0136
PO BOX 137, BURBANK, CA 91503-0137
PO BOX 138, BURBANK, CA 91503-0138
PO BOX 139, BURBANK, CA 91503-0139
PO BOX 140, BURBANK, CA 91503-0140
PO BOX 141, BURBANK, CA 91503-0141
PO BOX 142, BURBANK, CA 91503-0142
PO BOX 143, BURBANK, CA 91503-0143
PO BOX 144, BURBANK, CA 91503-0144
PO BOX 145, BURBANK, CA 91503-0145
PO BOX 146, BURBANK, CA 91503-0146
PO BOX 147, BURBANK, CA 91503-0147
PO BOX 148, BURBANK, CA 91503-0148
PO BOX 149, BURBANK, CA 91503-0149
PO BOX 150, BURBANK, CA 91503-0150
PO BOX 151, BURBANK, CA 91503-0151
PO BOX 152, BURBANK, CA 91503-0152
PO BOX 153, BURBANK, CA 91503-0153
PO BOX 154, BURBANK, CA 91503-0154
PO BOX 155, BURBANK, CA 91503-0155
PO BOX 156, BURBANK, CA 91503-0156
PO BOX 157, BURBANK, CA 91503-0157
PO BOX 158, BURBANK, CA 91503-0158
PO BOX 159, BURBANK, CA 91503-0159
PO BOX 160, BURBANK, CA 91503-0160
PO BOX 161, BURBANK, CA 91503-0161
PO BOX 162, BURBANK, CA 91503-0162
PO BOX 163, BURBANK, CA 91503-0163
PO BOX 164, BURBANK, CA 91503-0164
PO BOX 165, BURBANK, CA 91503-0165
PO BOX 166, BURBANK, CA 91503-0166
PO BOX 167, BURBANK, CA 91503-0167
PO BOX 168, BURBANK, CA 91503-0168
PO BOX 169, BURBANK, CA 91503-0169
PO BOX 170, BURBANK, CA 91503-0170
PO BOX 171, BURBANK, CA 91503-0171
PO BOX 172, BURBANK, CA 91503-0172
PO BOX 173, BURBANK, CA 91503-0173
PO BOX 174, BURBANK, CA 91503-0174
PO BOX 175, BURBANK, CA 91503-0175
PO BOX 176, BURBANK, CA 91503-0176
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