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, EAST IRVINE, CA 92650-0001
PO BOX 2, EAST IRVINE, CA 92650-0002
PO BOX 3, EAST IRVINE, CA 92650-0003
PO BOX 4, EAST IRVINE, CA 92650-0004
PO BOX 5, EAST IRVINE, CA 92650-0005
PO BOX 6, EAST IRVINE, CA 92650-0006
PO BOX 7, EAST IRVINE, CA 92650-0007
PO BOX 8, EAST IRVINE, CA 92650-0008
PO BOX 9, EAST IRVINE, CA 92650-0009
PO BOX 10, EAST IRVINE, CA 92650-0010
PO BOX 11, EAST IRVINE, CA 92650-0011
PO BOX 12, EAST IRVINE, CA 92650-0012
PO BOX 13, EAST IRVINE, CA 92650-0013
PO BOX 14, EAST IRVINE, CA 92650-0014
PO BOX 15, EAST IRVINE, CA 92650-0015
PO BOX 16, EAST IRVINE, CA 92650-0016
PO BOX 17, EAST IRVINE, CA 92650-0017
PO BOX 18, EAST IRVINE, CA 92650-0018
PO BOX 19, EAST IRVINE, CA 92650-0019
PO BOX 20, EAST IRVINE, CA 92650-0020
PO BOX 21, EAST IRVINE, CA 92650-0021
PO BOX 22, EAST IRVINE, CA 92650-0022
PO BOX 23, EAST IRVINE, CA 92650-0023
PO BOX 24, EAST IRVINE, CA 92650-0024
PO BOX 25, EAST IRVINE, CA 92650-0025
PO BOX 26, EAST IRVINE, CA 92650-0026
PO BOX 27, EAST IRVINE, CA 92650-0027
PO BOX 28, EAST IRVINE, CA 92650-0028
PO BOX 29, EAST IRVINE, CA 92650-0029
PO BOX 30, EAST IRVINE, CA 92650-0030
PO BOX 31, EAST IRVINE, CA 92650-0031
PO BOX 32, EAST IRVINE, CA 92650-0032
PO BOX 33, EAST IRVINE, CA 92650-0033
PO BOX 34, EAST IRVINE, CA 92650-0034
PO BOX 35, EAST IRVINE, CA 92650-0035
PO BOX 36, EAST IRVINE, CA 92650-0036
PO BOX 37, EAST IRVINE, CA 92650-0037
PO BOX 38, EAST IRVINE, CA 92650-0038
PO BOX 39, EAST IRVINE, CA 92650-0039
PO BOX 40, EAST IRVINE, CA 92650-0040
PO BOX 41, EAST IRVINE, CA 92650-0041
PO BOX 42, EAST IRVINE, CA 92650-0042
PO BOX 43, EAST IRVINE, CA 92650-0043
PO BOX 44, EAST IRVINE, CA 92650-0044
PO BOX 45, EAST IRVINE, CA 92650-0045
PO BOX 46, EAST IRVINE, CA 92650-0046
PO BOX 47, EAST IRVINE, CA 92650-0047
PO BOX 48, EAST IRVINE, CA 92650-0048
PO BOX 49, EAST IRVINE, CA 92650-0049
PO BOX 50, EAST IRVINE, CA 92650-0050
PO BOX 51, EAST IRVINE, CA 92650-0051
PO BOX 52, EAST IRVINE, CA 92650-0052
PO BOX 53, EAST IRVINE, CA 92650-0053
PO BOX 54, EAST IRVINE, CA 92650-0054
PO BOX 55, EAST IRVINE, CA 92650-0055
PO BOX 56, EAST IRVINE, CA 92650-0056
PO BOX 57, EAST IRVINE, CA 92650-0057
PO BOX 58, EAST IRVINE, CA 92650-0058
PO BOX 59, EAST IRVINE, CA 92650-0059
PO BOX 60, EAST IRVINE, CA 92650-0060
PO BOX 61, EAST IRVINE, CA 92650-0061
PO BOX 62, EAST IRVINE, CA 92650-0062
PO BOX 63, EAST IRVINE, CA 92650-0063
PO BOX 64, EAST IRVINE, CA 92650-0064
PO BOX 65, EAST IRVINE, CA 92650-0065
PO BOX 66, EAST IRVINE, CA 92650-0066
PO BOX 67, EAST IRVINE, CA 92650-0067
PO BOX 68, EAST IRVINE, CA 92650-0068
PO BOX 69, EAST IRVINE, CA 92650-0069
PO BOX 70, EAST IRVINE, CA 92650-0070
PO BOX 71, EAST IRVINE, CA 92650-0071
PO BOX 72, EAST IRVINE, CA 92650-0072
PO BOX 73, EAST IRVINE, CA 92650-0073
PO BOX 74, EAST IRVINE, CA 92650-0074
PO BOX 75, EAST IRVINE, CA 92650-0075
PO BOX 76, EAST IRVINE, CA 92650-0076
PO BOX 77, EAST IRVINE, CA 92650-0077
PO BOX 78, EAST IRVINE, CA 92650-0078
PO BOX 79, EAST IRVINE, CA 92650-0079
PO BOX 80, EAST IRVINE, CA 92650-0080
PO BOX 81, EAST IRVINE, CA 92650-0081
PO BOX 82, EAST IRVINE, CA 92650-0082
PO BOX 83, EAST IRVINE, CA 92650-0083
PO BOX 84, EAST IRVINE, CA 92650-0084
PO BOX 85, EAST IRVINE, CA 92650-0085
PO BOX 86, EAST IRVINE, CA 92650-0086
PO BOX 87, EAST IRVINE, CA 92650-0087
PO BOX 88, EAST IRVINE, CA 92650-0088
PO BOX 89, EAST IRVINE, CA 92650-0089
PO BOX 90, EAST IRVINE, CA 92650-0090
PO BOX 91, EAST IRVINE, CA 92650-0091
PO BOX 92, EAST IRVINE, CA 92650-0092
PO BOX 93, EAST IRVINE, CA 92650-0093
PO BOX 94, EAST IRVINE, CA 92650-0094
PO BOX 95, EAST IRVINE, CA 92650-0095
PO BOX 96, EAST IRVINE, CA 92650-0096
PO BOX 97, EAST IRVINE, CA 92650-0097
PO BOX 98, EAST IRVINE, CA 92650-0098
PO BOX 99, EAST IRVINE, CA 92650-0099
PO BOX 100, EAST IRVINE, CA 92650-0100
PO BOX 101, EAST IRVINE, CA 92650-0101
PO BOX 102, EAST IRVINE, CA 92650-0102
PO BOX 103, EAST IRVINE, CA 92650-0103
PO BOX 104, EAST IRVINE, CA 92650-0104
PO BOX 105, EAST IRVINE, CA 92650-0105
PO BOX 106, EAST IRVINE, CA 92650-0106
PO BOX 107, EAST IRVINE, CA 92650-0107
PO BOX 108, EAST IRVINE, CA 92650-0108
PO BOX 109, EAST IRVINE, CA 92650-0109
PO BOX 110, EAST IRVINE, CA 92650-0110
PO BOX 111, EAST IRVINE, CA 92650-0111
PO BOX 112, EAST IRVINE, CA 92650-0112
PO BOX 113, EAST IRVINE, CA 92650-0113
PO BOX 114, EAST IRVINE, CA 92650-0114
PO BOX 115, EAST IRVINE, CA 92650-0115
PO BOX 116, EAST IRVINE, CA 92650-0116
PO BOX 117, EAST IRVINE, CA 92650-0117
PO BOX 118, EAST IRVINE, CA 92650-0118
PO BOX 119, EAST IRVINE, CA 92650-0119
PO BOX 120, EAST IRVINE, CA 92650-0120
PO BOX 121, EAST IRVINE, CA 92650-0121
PO BOX 122, EAST IRVINE, CA 92650-0122
PO BOX 123, EAST IRVINE, CA 92650-0123
PO BOX 124, EAST IRVINE, CA 92650-0124
PO BOX 125, EAST IRVINE, CA 92650-0125
PO BOX 126, EAST IRVINE, CA 92650-0126
PO BOX 127, EAST IRVINE, CA 92650-0127
PO BOX 128, EAST IRVINE, CA 92650-0128
PO BOX 129, EAST IRVINE, CA 92650-0129
PO BOX 130, EAST IRVINE, CA 92650-0130
PO BOX 131, EAST IRVINE, CA 92650-0131
PO BOX 132, EAST IRVINE, CA 92650-0132
PO BOX 133, EAST IRVINE, CA 92650-0133
PO BOX 134, EAST IRVINE, CA 92650-0134
PO BOX 135, EAST IRVINE, CA 92650-0135
PO BOX 136, EAST IRVINE, CA 92650-0136
PO BOX 137, EAST IRVINE, CA 92650-0137
PO BOX 138, EAST IRVINE, CA 92650-0138
PO BOX 139, EAST IRVINE, CA 92650-0139
PO BOX 140, EAST IRVINE, CA 92650-0140
PO BOX 141, EAST IRVINE, CA 92650-0141
PO BOX 142, EAST IRVINE, CA 92650-0142
PO BOX 143, EAST IRVINE, CA 92650-0143
PO BOX 144, EAST IRVINE, CA 92650-0144
PO BOX 145, EAST IRVINE, CA 92650-0145
PO BOX 146, EAST IRVINE, CA 92650-0146
PO BOX 147, EAST IRVINE, CA 92650-0147
PO BOX 148, EAST IRVINE, CA 92650-0148
PO BOX 149, EAST IRVINE, CA 92650-0149
PO BOX 150, EAST IRVINE, CA 92650-0150
PO BOX 151, EAST IRVINE, CA 92650-0151
PO BOX 152, EAST IRVINE, CA 92650-0152
PO BOX 153, EAST IRVINE, CA 92650-0153
PO BOX 154, EAST IRVINE, CA 92650-0154
PO BOX 155, EAST IRVINE, CA 92650-0155
PO BOX 156, EAST IRVINE, CA 92650-0156
PO BOX 157, EAST IRVINE, CA 92650-0157
PO BOX 158, EAST IRVINE, CA 92650-0158
PO BOX 159, EAST IRVINE, CA 92650-0159
PO BOX 160, EAST IRVINE, CA 92650-0160
PO BOX 161, EAST IRVINE, CA 92650-0161
PO BOX 162, EAST IRVINE, CA 92650-0162
PO BOX 163, EAST IRVINE, CA 92650-0163
PO BOX 164, EAST IRVINE, CA 92650-0164
PO BOX 165, EAST IRVINE, CA 92650-0165
PO BOX 166, EAST IRVINE, CA 92650-0166
PO BOX 167, EAST IRVINE, CA 92650-0167
PO BOX 168, EAST IRVINE, CA 92650-0168
PO BOX 169, EAST IRVINE, CA 92650-0169
PO BOX 170, EAST IRVINE, CA 92650-0170
PO BOX 171, EAST IRVINE, CA 92650-0171
PO BOX 172, EAST IRVINE, CA 92650-0172
PO BOX 173, EAST IRVINE, CA 92650-0173
PO BOX 174, EAST IRVINE, CA 92650-0174
PO BOX 175, EAST IRVINE, CA 92650-0175
PO BOX 176, EAST IRVINE, CA 92650-0176
PO BOX 177, EAST IRVINE, CA 92650-0177
PO BOX 178, EAST IRVINE, CA 92650-0178
PO BOX 179, EAST IRVINE, CA 92650-0179
PO BOX 180, EAST IRVINE, CA 92650-0180
PO BOX 181, EAST IRVINE, CA 92650-0181
PO BOX 182, EAST IRVINE, CA 92650-0182
PO BOX 183, EAST IRVINE, CA 92650-0183
PO BOX 184, EAST IRVINE, CA 92650-0184
PO BOX 185, EAST IRVINE, CA 92650-0185
PO BOX 186, EAST IRVINE, CA 92650-0186
PO BOX 187, EAST IRVINE, CA 92650-0187
PO BOX 188, EAST IRVINE, CA 92650-0188
PO BOX 189, EAST IRVINE, CA 92650-0189
PO BOX 190, EAST IRVINE, CA 92650-0190
PO BOX 191, EAST IRVINE, CA 92650-0191
PO BOX 192, EAST IRVINE, CA 92650-0192
PO BOX 193, EAST IRVINE, CA 92650-0193
PO BOX 194, EAST IRVINE, CA 92650-0194
PO BOX 195, EAST IRVINE, CA 92650-0195
PO BOX 196, EAST IRVINE, CA 92650-0196
PO BOX 197, EAST IRVINE, CA 92650-0197
PO BOX 198, EAST IRVINE, CA 92650-0198
PO BOX 199, EAST IRVINE, CA 92650-0199
PO BOX 200, EAST IRVINE, CA 92650-0200
PO BOX 201, EAST IRVINE, CA 92650-0201
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