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, JULIAN, CA 92036-0021
PO BOX 22, JULIAN, CA 92036-0022
PO BOX 23, JULIAN, CA 92036-0023
PO BOX 24, JULIAN, CA 92036-0024
PO BOX 25, JULIAN, CA 92036-0025
PO BOX 26, JULIAN, CA 92036-0026
PO BOX 27, JULIAN, CA 92036-0027
PO BOX 28, JULIAN, CA 92036-0028
PO BOX 29, JULIAN, CA 92036-0029
PO BOX 30, JULIAN, CA 92036-0030
PO BOX 31, JULIAN, CA 92036-0031
PO BOX 32, JULIAN, CA 92036-0032
PO BOX 33, JULIAN, CA 92036-0033
PO BOX 34, JULIAN, CA 92036-0034
PO BOX 35, JULIAN, CA 92036-0035
PO BOX 36, JULIAN, CA 92036-0036
PO BOX 37, JULIAN, CA 92036-0037
PO BOX 38, JULIAN, CA 92036-0038
PO BOX 39, JULIAN, CA 92036-0039
PO BOX 40, JULIAN, CA 92036-0040
PO BOX 41, JULIAN, CA 92036-0041
PO BOX 42, JULIAN, CA 92036-0042
PO BOX 43, JULIAN, CA 92036-0043
PO BOX 44, JULIAN, CA 92036-0044
PO BOX 45, JULIAN, CA 92036-0045
PO BOX 46, JULIAN, CA 92036-0046
PO BOX 47, JULIAN, CA 92036-0047
PO BOX 48, JULIAN, CA 92036-0048
PO BOX 49, JULIAN, CA 92036-0049
PO BOX 50, JULIAN, CA 92036-0050
PO BOX 51, JULIAN, CA 92036-0051
PO BOX 52, JULIAN, CA 92036-0052
PO BOX 53, JULIAN, CA 92036-0053
PO BOX 54, JULIAN, CA 92036-0054
PO BOX 55, JULIAN, CA 92036-0055
PO BOX 56, JULIAN, CA 92036-0056
PO BOX 57, JULIAN, CA 92036-0057
PO BOX 58, JULIAN, CA 92036-0058
PO BOX 59, JULIAN, CA 92036-0059
PO BOX 60, JULIAN, CA 92036-0060
PO BOX 61, JULIAN, CA 92036-0061
PO BOX 62, JULIAN, CA 92036-0062
PO BOX 63, JULIAN, CA 92036-0063
PO BOX 64, JULIAN, CA 92036-0064
PO BOX 65, JULIAN, CA 92036-0065
PO BOX 66, JULIAN, CA 92036-0066
PO BOX 67, JULIAN, CA 92036-0067
PO BOX 68, JULIAN, CA 92036-0068
PO BOX 69, JULIAN, CA 92036-0069
PO BOX 70, JULIAN, CA 92036-0070
PO BOX 71, JULIAN, CA 92036-0071
PO BOX 72, JULIAN, CA 92036-0072
PO BOX 73, JULIAN, CA 92036-0073
PO BOX 74, JULIAN, CA 92036-0074
PO BOX 75, JULIAN, CA 92036-0075
PO BOX 76, JULIAN, CA 92036-0076
PO BOX 77, JULIAN, CA 92036-0077
PO BOX 78, JULIAN, CA 92036-0078
PO BOX 79, JULIAN, CA 92036-0079
PO BOX 80, JULIAN, CA 92036-0080
PO BOX 81, JULIAN, CA 92036-0081
PO BOX 82, JULIAN, CA 92036-0082
PO BOX 83, JULIAN, CA 92036-0083
PO BOX 84, JULIAN, CA 92036-0084
PO BOX 85, JULIAN, CA 92036-0085
PO BOX 86, JULIAN, CA 92036-0086
PO BOX 87, JULIAN, CA 92036-0087
PO BOX 88, JULIAN, CA 92036-0088
PO BOX 89, JULIAN, CA 92036-0089
PO BOX 90, JULIAN, CA 92036-0090
PO BOX 91, JULIAN, CA 92036-0091
PO BOX 92, JULIAN, CA 92036-0092
PO BOX 93, JULIAN, CA 92036-0093
PO BOX 94, JULIAN, CA 92036-0094
PO BOX 95, JULIAN, CA 92036-0095
PO BOX 96, JULIAN, CA 92036-0096
PO BOX 97, JULIAN, CA 92036-0097
PO BOX 98, JULIAN, CA 92036-0098
PO BOX 99, JULIAN, CA 92036-0099
PO BOX 100, JULIAN, CA 92036-0100
PO BOX 101, JULIAN, CA 92036-0101
PO BOX 102, JULIAN, CA 92036-0102
PO BOX 103, JULIAN, CA 92036-0103
PO BOX 104, JULIAN, CA 92036-0104
PO BOX 105, JULIAN, CA 92036-0105
PO BOX 106, JULIAN, CA 92036-0106
PO BOX 107, JULIAN, CA 92036-0107
PO BOX 108, JULIAN, CA 92036-0108
PO BOX 109, JULIAN, CA 92036-0109
PO BOX 110, JULIAN, CA 92036-0110
PO BOX 111, JULIAN, CA 92036-0111
PO BOX 112, JULIAN, CA 92036-0112
PO BOX 113, JULIAN, CA 92036-0113
PO BOX 114, JULIAN, CA 92036-0114
PO BOX 115, JULIAN, CA 92036-0115
PO BOX 116, JULIAN, CA 92036-0116
PO BOX 117, JULIAN, CA 92036-0117
PO BOX 118, JULIAN, CA 92036-0118
PO BOX 119, JULIAN, CA 92036-0119
PO BOX 120, JULIAN, CA 92036-0120
PO BOX 121, JULIAN, CA 92036-0121
PO BOX 122, JULIAN, CA 92036-0122
PO BOX 123, JULIAN, CA 92036-0123
PO BOX 124, JULIAN, CA 92036-0124
PO BOX 125, JULIAN, CA 92036-0125
PO BOX 126, JULIAN, CA 92036-0126
PO BOX 127, JULIAN, CA 92036-0127
PO BOX 128, JULIAN, CA 92036-0128
PO BOX 129, JULIAN, CA 92036-0129
PO BOX 130, JULIAN, CA 92036-0130
PO BOX 131, JULIAN, CA 92036-0131
PO BOX 132, JULIAN, CA 92036-0132
PO BOX 133, JULIAN, CA 92036-0133
PO BOX 134, JULIAN, CA 92036-0134
PO BOX 135, JULIAN, CA 92036-0135
PO BOX 136, JULIAN, CA 92036-0136
PO BOX 137, JULIAN, CA 92036-0137
PO BOX 138, JULIAN, CA 92036-0138
PO BOX 139, JULIAN, CA 92036-0139
PO BOX 140, JULIAN, CA 92036-0140
PO BOX 141, JULIAN, CA 92036-0141
PO BOX 142, JULIAN, CA 92036-0142
PO BOX 143, JULIAN, CA 92036-0143
PO BOX 144, JULIAN, CA 92036-0144
PO BOX 145, JULIAN, CA 92036-0145
PO BOX 146, JULIAN, CA 92036-0146
PO BOX 147, JULIAN, CA 92036-0147
PO BOX 148, JULIAN, CA 92036-0148
PO BOX 149, JULIAN, CA 92036-0149
PO BOX 150, JULIAN, CA 92036-0150
PO BOX 151, JULIAN, CA 92036-0151
PO BOX 152, JULIAN, CA 92036-0152
PO BOX 153, JULIAN, CA 92036-0153
PO BOX 154, JULIAN, CA 92036-0154
PO BOX 155, JULIAN, CA 92036-0155
PO BOX 156, JULIAN, CA 92036-0156
PO BOX 157, JULIAN, CA 92036-0157
PO BOX 158, JULIAN, CA 92036-0158
PO BOX 159, JULIAN, CA 92036-0159
PO BOX 160, JULIAN, CA 92036-0160
PO BOX 161, JULIAN, CA 92036-0161
PO BOX 162, JULIAN, CA 92036-0162
PO BOX 163, JULIAN, CA 92036-0163
PO BOX 164, JULIAN, CA 92036-0164
PO BOX 165, JULIAN, CA 92036-0165
PO BOX 166, JULIAN, CA 92036-0166
PO BOX 167, JULIAN, CA 92036-0167
PO BOX 168, JULIAN, CA 92036-0168
PO BOX 169, JULIAN, CA 92036-0169
PO BOX 170, JULIAN, CA 92036-0170
PO BOX 171, JULIAN, CA 92036-0171
PO BOX 172, JULIAN, CA 92036-0172
PO BOX 173, JULIAN, CA 92036-0173
PO BOX 174, JULIAN, CA 92036-0174
PO BOX 175, JULIAN, CA 92036-0175
PO BOX 176, JULIAN, CA 92036-0176
PO BOX 177, JULIAN, CA 92036-0177
PO BOX 178, JULIAN, CA 92036-0178
PO BOX 179, JULIAN, CA 92036-0179
PO BOX 180, JULIAN, CA 92036-0180
PO BOX 181, JULIAN, CA 92036-0181
PO BOX 182, JULIAN, CA 92036-0182
PO BOX 183, JULIAN, CA 92036-0183
PO BOX 184, JULIAN, CA 92036-0184
PO BOX 185, JULIAN, CA 92036-0185
PO BOX 186, JULIAN, CA 92036-0186
PO BOX 187, JULIAN, CA 92036-0187
PO BOX 188, JULIAN, CA 92036-0188
PO BOX 189, JULIAN, CA 92036-0189
PO BOX 190, JULIAN, CA 92036-0190
PO BOX 191, JULIAN, CA 92036-0191
PO BOX 192, JULIAN, CA 92036-0192
PO BOX 193, JULIAN, CA 92036-0193
PO BOX 194, JULIAN, CA 92036-0194
PO BOX 195, JULIAN, CA 92036-0195
PO BOX 196, JULIAN, CA 92036-0196
PO BOX 197, JULIAN, CA 92036-0197
PO BOX 198, JULIAN, CA 92036-0198
PO BOX 199, JULIAN, CA 92036-0199
PO BOX 200, JULIAN, CA 92036-0200
PO BOX 201, JULIAN, CA 92036-0201
PO BOX 202, JULIAN, CA 92036-0202
PO BOX 203, JULIAN, CA 92036-0203
PO BOX 204, JULIAN, CA 92036-0204
PO BOX 205, JULIAN, CA 92036-0205
PO BOX 206, JULIAN, CA 92036-0206
PO BOX 207, JULIAN, CA 92036-0207
PO BOX 208, JULIAN, CA 92036-0208
PO BOX 209, JULIAN, CA 92036-0209
PO BOX 210, JULIAN, CA 92036-0210
PO BOX 211, JULIAN, CA 92036-0211
PO BOX 212, JULIAN, CA 92036-0212
PO BOX 213, JULIAN, CA 92036-0213
PO BOX 214, JULIAN, CA 92036-0214
PO BOX 215, JULIAN, CA 92036-0215
PO BOX 216, JULIAN, CA 92036-0216
PO BOX 217, JULIAN, CA 92036-0217
PO BOX 218, JULIAN, CA 92036-0218
PO BOX 219, JULIAN, CA 92036-0219
PO BOX 220, JULIAN, CA 92036-0220
PO BOX 221, JULIAN, CA 92036-0221
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