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, POWAY, CA 92074-0001
PO BOX 2, POWAY, CA 92074-0002
PO BOX 3, POWAY, CA 92074-0003
PO BOX 4, POWAY, CA 92074-0004
PO BOX 5, POWAY, CA 92074-0005
PO BOX 6, POWAY, CA 92074-0006
PO BOX 7, POWAY, CA 92074-0007
PO BOX 8, POWAY, CA 92074-0008
PO BOX 9, POWAY, CA 92074-0009
PO BOX 10, POWAY, CA 92074-0010
PO BOX 11, POWAY, CA 92074-0011
PO BOX 12, POWAY, CA 92074-0012
PO BOX 13, POWAY, CA 92074-0013
PO BOX 14, POWAY, CA 92074-0014
PO BOX 15, POWAY, CA 92074-0015
PO BOX 16, POWAY, CA 92074-0016
PO BOX 17, POWAY, CA 92074-0017
PO BOX 18, POWAY, CA 92074-0018
PO BOX 19, POWAY, CA 92074-0019
PO BOX 20, POWAY, CA 92074-0020
PO BOX 21, POWAY, CA 92074-0021
PO BOX 22, POWAY, CA 92074-0022
PO BOX 23, POWAY, CA 92074-0023
PO BOX 24, POWAY, CA 92074-0024
PO BOX 25, POWAY, CA 92074-0025
PO BOX 26, POWAY, CA 92074-0026
PO BOX 27, POWAY, CA 92074-0027
PO BOX 28, POWAY, CA 92074-0028
PO BOX 29, POWAY, CA 92074-0029
PO BOX 30, POWAY, CA 92074-0030
PO BOX 31, POWAY, CA 92074-0031
PO BOX 32, POWAY, CA 92074-0032
PO BOX 33, POWAY, CA 92074-0033
PO BOX 34, POWAY, CA 92074-0034
PO BOX 35, POWAY, CA 92074-0035
PO BOX 36, POWAY, CA 92074-0036
PO BOX 37, POWAY, CA 92074-0037
PO BOX 38, POWAY, CA 92074-0038
PO BOX 39, POWAY, CA 92074-0039
PO BOX 40, POWAY, CA 92074-0040
PO BOX 41, POWAY, CA 92074-0041
PO BOX 42, POWAY, CA 92074-0042
PO BOX 43, POWAY, CA 92074-0043
PO BOX 44, POWAY, CA 92074-0044
PO BOX 45, POWAY, CA 92074-0045
PO BOX 46, POWAY, CA 92074-0046
PO BOX 47, POWAY, CA 92074-0047
PO BOX 48, POWAY, CA 92074-0048
PO BOX 49, POWAY, CA 92074-0049
PO BOX 50, POWAY, CA 92074-0050
PO BOX 51, POWAY, CA 92074-0051
PO BOX 52, POWAY, CA 92074-0052
PO BOX 53, POWAY, CA 92074-0053
PO BOX 54, POWAY, CA 92074-0054
PO BOX 55, POWAY, CA 92074-0055
PO BOX 56, POWAY, CA 92074-0056
PO BOX 57, POWAY, CA 92074-0057
PO BOX 58, POWAY, CA 92074-0058
PO BOX 59, POWAY, CA 92074-0059
PO BOX 60, POWAY, CA 92074-0060
PO BOX 61, POWAY, CA 92074-0061
PO BOX 62, POWAY, CA 92074-0062
PO BOX 63, POWAY, CA 92074-0063
PO BOX 64, POWAY, CA 92074-0064
PO BOX 65, POWAY, CA 92074-0065
PO BOX 66, POWAY, CA 92074-0066
PO BOX 67, POWAY, CA 92074-0067
PO BOX 68, POWAY, CA 92074-0068
PO BOX 69, POWAY, CA 92074-0069
PO BOX 70, POWAY, CA 92074-0070
PO BOX 71, POWAY, CA 92074-0071
PO BOX 72, POWAY, CA 92074-0072
PO BOX 73, POWAY, CA 92074-0073
PO BOX 74, POWAY, CA 92074-0074
PO BOX 75, POWAY, CA 92074-0075
PO BOX 76, POWAY, CA 92074-0076
PO BOX 77, POWAY, CA 92074-0077
PO BOX 78, POWAY, CA 92074-0078
PO BOX 79, POWAY, CA 92074-0079
PO BOX 80, POWAY, CA 92074-0080
PO BOX 81, POWAY, CA 92074-0081
PO BOX 82, POWAY, CA 92074-0082
PO BOX 83, POWAY, CA 92074-0083
PO BOX 84, POWAY, CA 92074-0084
PO BOX 85, POWAY, CA 92074-0085
PO BOX 86, POWAY, CA 92074-0086
PO BOX 87, POWAY, CA 92074-0087
PO BOX 88, POWAY, CA 92074-0088
PO BOX 89, POWAY, CA 92074-0089
PO BOX 90, POWAY, CA 92074-0090
PO BOX 91, POWAY, CA 92074-0091
PO BOX 92, POWAY, CA 92074-0092
PO BOX 93, POWAY, CA 92074-0093
PO BOX 94, POWAY, CA 92074-0094
PO BOX 95, POWAY, CA 92074-0095
PO BOX 96, POWAY, CA 92074-0096
PO BOX 97, POWAY, CA 92074-0097
PO BOX 98, POWAY, CA 92074-0098
PO BOX 99, POWAY, CA 92074-0099
PO BOX 100, POWAY, CA 92074-0100
PO BOX 101, POWAY, CA 92074-0101
PO BOX 102, POWAY, CA 92074-0102
PO BOX 103, POWAY, CA 92074-0103
PO BOX 104, POWAY, CA 92074-0104
PO BOX 105, POWAY, CA 92074-0105
PO BOX 106, POWAY, CA 92074-0106
PO BOX 107, POWAY, CA 92074-0107
PO BOX 108, POWAY, CA 92074-0108
PO BOX 109, POWAY, CA 92074-0109
PO BOX 110, POWAY, CA 92074-0110
PO BOX 111, POWAY, CA 92074-0111
PO BOX 112, POWAY, CA 92074-0112
PO BOX 113, POWAY, CA 92074-0113
PO BOX 114, POWAY, CA 92074-0114
PO BOX 115, POWAY, CA 92074-0115
PO BOX 116, POWAY, CA 92074-0116
PO BOX 117, POWAY, CA 92074-0117
PO BOX 118, POWAY, CA 92074-0118
PO BOX 119, POWAY, CA 92074-0119
PO BOX 120, POWAY, CA 92074-0120
PO BOX 121, POWAY, CA 92074-0121
PO BOX 122, POWAY, CA 92074-0122
PO BOX 123, POWAY, CA 92074-0123
PO BOX 124, POWAY, CA 92074-0124
PO BOX 125, POWAY, CA 92074-0125
PO BOX 126, POWAY, CA 92074-0126
PO BOX 127, POWAY, CA 92074-0127
PO BOX 128, POWAY, CA 92074-0128
PO BOX 129, POWAY, CA 92074-0129
PO BOX 130, POWAY, CA 92074-0130
PO BOX 131, POWAY, CA 92074-0131
PO BOX 132, POWAY, CA 92074-0132
PO BOX 133, POWAY, CA 92074-0133
PO BOX 134, POWAY, CA 92074-0134
PO BOX 135, POWAY, CA 92074-0135
PO BOX 136, POWAY, CA 92074-0136
PO BOX 137, POWAY, CA 92074-0137
PO BOX 138, POWAY, CA 92074-0138
PO BOX 139, POWAY, CA 92074-0139
PO BOX 140, POWAY, CA 92074-0140
PO BOX 141, POWAY, CA 92074-0141
PO BOX 142, POWAY, CA 92074-0142
PO BOX 143, POWAY, CA 92074-0143
PO BOX 144, POWAY, CA 92074-0144
PO BOX 145, POWAY, CA 92074-0145
PO BOX 146, POWAY, CA 92074-0146
PO BOX 147, POWAY, CA 92074-0147
PO BOX 148, POWAY, CA 92074-0148
PO BOX 149, POWAY, CA 92074-0149
PO BOX 150, POWAY, CA 92074-0150
PO BOX 151, POWAY, CA 92074-0151
PO BOX 152, POWAY, CA 92074-0152
PO BOX 153, POWAY, CA 92074-0153
PO BOX 154, POWAY, CA 92074-0154
PO BOX 155, POWAY, CA 92074-0155
PO BOX 156, POWAY, CA 92074-0156
PO BOX 157, POWAY, CA 92074-0157
PO BOX 158, POWAY, CA 92074-0158
PO BOX 159, POWAY, CA 92074-0159
PO BOX 160, POWAY, CA 92074-0160
PO BOX 161, POWAY, CA 92074-0161
PO BOX 162, POWAY, CA 92074-0162
PO BOX 163, POWAY, CA 92074-0163
PO BOX 164, POWAY, CA 92074-0164
PO BOX 165, POWAY, CA 92074-0165
PO BOX 166, POWAY, CA 92074-0166
PO BOX 167, POWAY, CA 92074-0167
PO BOX 168, POWAY, CA 92074-0168
PO BOX 169, POWAY, CA 92074-0169
PO BOX 170, POWAY, CA 92074-0170
PO BOX 171, POWAY, CA 92074-0171
PO BOX 172, POWAY, CA 92074-0172
PO BOX 173, POWAY, CA 92074-0173
PO BOX 174, POWAY, CA 92074-0174
PO BOX 175, POWAY, CA 92074-0175
PO BOX 176, POWAY, CA 92074-0176
PO BOX 177, POWAY, CA 92074-0177
PO BOX 178, POWAY, CA 92074-0178
PO BOX 179, POWAY, CA 92074-0179
PO BOX 180, POWAY, CA 92074-0180
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