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, DALY CITY, CA 94016-0001
PO BOX 2, DALY CITY, CA 94016-0002
PO BOX 3, DALY CITY, CA 94016-0003
PO BOX 4, DALY CITY, CA 94016-0004
PO BOX 5, DALY CITY, CA 94016-0005
PO BOX 6, DALY CITY, CA 94016-0006
PO BOX 7, DALY CITY, CA 94016-0007
PO BOX 8, DALY CITY, CA 94016-0008
PO BOX 9, DALY CITY, CA 94016-0009
PO BOX 10, DALY CITY, CA 94016-0010
PO BOX 11, DALY CITY, CA 94016-0011
PO BOX 12, DALY CITY, CA 94016-0012
PO BOX 13, DALY CITY, CA 94016-0013
PO BOX 14, DALY CITY, CA 94016-0014
PO BOX 15, DALY CITY, CA 94016-0015
PO BOX 16, DALY CITY, CA 94016-0016
PO BOX 17, DALY CITY, CA 94016-0017
PO BOX 18, DALY CITY, CA 94016-0018
PO BOX 19, DALY CITY, CA 94016-0019
PO BOX 20, DALY CITY, CA 94016-0020
PO BOX 21, DALY CITY, CA 94016-0021
PO BOX 22, DALY CITY, CA 94016-0022
PO BOX 23, DALY CITY, CA 94016-0023
PO BOX 24, DALY CITY, CA 94016-0024
PO BOX 25, DALY CITY, CA 94016-0025
PO BOX 26, DALY CITY, CA 94016-0026
PO BOX 27, DALY CITY, CA 94016-0027
PO BOX 28, DALY CITY, CA 94016-0028
PO BOX 29, DALY CITY, CA 94016-0029
PO BOX 30, DALY CITY, CA 94016-0030
PO BOX 31, DALY CITY, CA 94016-0031
PO BOX 32, DALY CITY, CA 94016-0032
PO BOX 33, DALY CITY, CA 94016-0033
PO BOX 34, DALY CITY, CA 94016-0034
PO BOX 35, DALY CITY, CA 94016-0035
PO BOX 36, DALY CITY, CA 94016-0036
PO BOX 37, DALY CITY, CA 94016-0037
PO BOX 38, DALY CITY, CA 94016-0038
PO BOX 39, DALY CITY, CA 94016-0039
PO BOX 40, DALY CITY, CA 94016-0040
PO BOX 41, DALY CITY, CA 94016-0041
PO BOX 42, DALY CITY, CA 94016-0042
PO BOX 43, DALY CITY, CA 94016-0043
PO BOX 44, DALY CITY, CA 94016-0044
PO BOX 45, DALY CITY, CA 94016-0045
PO BOX 46, DALY CITY, CA 94016-0046
PO BOX 47, DALY CITY, CA 94016-0047
PO BOX 48, DALY CITY, CA 94016-0048
PO BOX 49, DALY CITY, CA 94016-0049
PO BOX 50, DALY CITY, CA 94016-0050
PO BOX 51, DALY CITY, CA 94016-0051
PO BOX 52, DALY CITY, CA 94016-0052
PO BOX 53, DALY CITY, CA 94016-0053
PO BOX 54, DALY CITY, CA 94016-0054
PO BOX 55, DALY CITY, CA 94016-0055
PO BOX 56, DALY CITY, CA 94016-0056
PO BOX 57, DALY CITY, CA 94016-0057
PO BOX 58, DALY CITY, CA 94016-0058
PO BOX 59, DALY CITY, CA 94016-0059
PO BOX 60, DALY CITY, CA 94016-0060
PO BOX 61, DALY CITY, CA 94016-0061
PO BOX 62, DALY CITY, CA 94016-0062
PO BOX 63, DALY CITY, CA 94016-0063
PO BOX 64, DALY CITY, CA 94016-0064
PO BOX 65, DALY CITY, CA 94016-0065
PO BOX 66, DALY CITY, CA 94016-0066
PO BOX 67, DALY CITY, CA 94016-0067
PO BOX 68, DALY CITY, CA 94016-0068
PO BOX 69, DALY CITY, CA 94016-0069
PO BOX 70, DALY CITY, CA 94016-0070
PO BOX 71, DALY CITY, CA 94016-0071
PO BOX 72, DALY CITY, CA 94016-0072
PO BOX 73, DALY CITY, CA 94016-0073
PO BOX 74, DALY CITY, CA 94016-0074
PO BOX 75, DALY CITY, CA 94016-0075
PO BOX 76, DALY CITY, CA 94016-0076
PO BOX 77, DALY CITY, CA 94016-0077
PO BOX 78, DALY CITY, CA 94016-0078
PO BOX 79, DALY CITY, CA 94016-0079
PO BOX 80, DALY CITY, CA 94016-0080
PO BOX 81, DALY CITY, CA 94016-0081
PO BOX 82, DALY CITY, CA 94016-0082
PO BOX 83, DALY CITY, CA 94016-0083
PO BOX 84, DALY CITY, CA 94016-0084
PO BOX 85, DALY CITY, CA 94016-0085
PO BOX 86, DALY CITY, CA 94016-0086
PO BOX 87, DALY CITY, CA 94016-0087
PO BOX 88, DALY CITY, CA 94016-0088
PO BOX 89, DALY CITY, CA 94016-0089
PO BOX 90, DALY CITY, CA 94016-0090
PO BOX 91, DALY CITY, CA 94016-0091
PO BOX 92, DALY CITY, CA 94016-0092
PO BOX 93, DALY CITY, CA 94016-0093
PO BOX 94, DALY CITY, CA 94016-0094
PO BOX 95, DALY CITY, CA 94016-0095
PO BOX 96, DALY CITY, CA 94016-0096
PO BOX 97, DALY CITY, CA 94016-0097
PO BOX 98, DALY CITY, CA 94016-0098
PO BOX 99, DALY CITY, CA 94016-0099
PO BOX 100, DALY CITY, CA 94016-0100
PO BOX 101, DALY CITY, CA 94016-0101
PO BOX 102, DALY CITY, CA 94016-0102
PO BOX 103, DALY CITY, CA 94016-0103
PO BOX 104, DALY CITY, CA 94016-0104
PO BOX 105, DALY CITY, CA 94016-0105
PO BOX 106, DALY CITY, CA 94016-0106
PO BOX 107, DALY CITY, CA 94016-0107
PO BOX 108, DALY CITY, CA 94016-0108
PO BOX 109, DALY CITY, CA 94016-0109
PO BOX 110, DALY CITY, CA 94016-0110
PO BOX 111, DALY CITY, CA 94016-0111
PO BOX 112, DALY CITY, CA 94016-0112
PO BOX 113, DALY CITY, CA 94016-0113
PO BOX 114, DALY CITY, CA 94016-0114
PO BOX 115, DALY CITY, CA 94016-0115
PO BOX 116, DALY CITY, CA 94016-0116
PO BOX 117, DALY CITY, CA 94016-0117
PO BOX 118, DALY CITY, CA 94016-0118
PO BOX 119, DALY CITY, CA 94016-0119
PO BOX 120, DALY CITY, CA 94016-0120
PO BOX 121, DALY CITY, CA 94016-0121
PO BOX 122, DALY CITY, CA 94016-0122
PO BOX 123, DALY CITY, CA 94016-0123
PO BOX 124, DALY CITY, CA 94016-0124
PO BOX 125, DALY CITY, CA 94016-0125
PO BOX 126, DALY CITY, CA 94016-0126
PO BOX 127, DALY CITY, CA 94016-0127
PO BOX 128, DALY CITY, CA 94016-0128
PO BOX 129, DALY CITY, CA 94016-0129
PO BOX 130, DALY CITY, CA 94016-0130
PO BOX 131, DALY CITY, CA 94016-0131
PO BOX 132, DALY CITY, CA 94016-0132
PO BOX 133, DALY CITY, CA 94016-0133
PO BOX 134, DALY CITY, CA 94016-0134
PO BOX 135, DALY CITY, CA 94016-0135
PO BOX 136, DALY CITY, CA 94016-0136
PO BOX 137, DALY CITY, CA 94016-0137
PO BOX 138, DALY CITY, CA 94016-0138
PO BOX 139, DALY CITY, CA 94016-0139
PO BOX 140, DALY CITY, CA 94016-0140
PO BOX 141, DALY CITY, CA 94016-0141
PO BOX 142, DALY CITY, CA 94016-0142
PO BOX 143, DALY CITY, CA 94016-0143
PO BOX 144, DALY CITY, CA 94016-0144
PO BOX 145, DALY CITY, CA 94016-0145
PO BOX 146, DALY CITY, CA 94016-0146
PO BOX 147, DALY CITY, CA 94016-0147
PO BOX 148, DALY CITY, CA 94016-0148
PO BOX 149, DALY CITY, CA 94016-0149
PO BOX 150, DALY CITY, CA 94016-0150
PO BOX 151, DALY CITY, CA 94016-0151
PO BOX 152, DALY CITY, CA 94016-0152
PO BOX 153, DALY CITY, CA 94016-0153
PO BOX 154, DALY CITY, CA 94016-0154
PO BOX 155, DALY CITY, CA 94016-0155
PO BOX 156, DALY CITY, CA 94016-0156
PO BOX 157, DALY CITY, CA 94016-0157
PO BOX 158, DALY CITY, CA 94016-0158
PO BOX 159, DALY CITY, CA 94016-0159
PO BOX 160, DALY CITY, CA 94016-0160
PO BOX 161, DALY CITY, CA 94016-0161
PO BOX 162, DALY CITY, CA 94016-0162
PO BOX 163, DALY CITY, CA 94016-0163
PO BOX 164, DALY CITY, CA 94016-0164
PO BOX 165, DALY CITY, CA 94016-0165
PO BOX 166, DALY CITY, CA 94016-0166
PO BOX 167, DALY CITY, CA 94016-0167
PO BOX 168, DALY CITY, CA 94016-0168
PO BOX 169, DALY CITY, CA 94016-0169
PO BOX 170, DALY CITY, CA 94016-0170
PO BOX 171, DALY CITY, CA 94016-0171
PO BOX 172, DALY CITY, CA 94016-0172
PO BOX 173, DALY CITY, CA 94016-0173
PO BOX 174, DALY CITY, CA 94016-0174
PO BOX 175, DALY CITY, CA 94016-0175
PO BOX 176, DALY CITY, CA 94016-0176
PO BOX 177, DALY CITY, CA 94016-0177
PO BOX 178, DALY CITY, CA 94016-0178
PO BOX 179, DALY CITY, CA 94016-0179
PO BOX 180, DALY CITY, CA 94016-0180
PO BOX 181, DALY CITY, CA 94016-0181
PO BOX 182, DALY CITY, CA 94016-0182
PO BOX 183, DALY CITY, CA 94016-0183
PO BOX 184, DALY CITY, CA 94016-0184
PO BOX 185, DALY CITY, CA 94016-0185
PO BOX 186, DALY CITY, CA 94016-0186
PO BOX 187, DALY CITY, CA 94016-0187
PO BOX 188, DALY CITY, CA 94016-0188
PO BOX 189, DALY CITY, CA 94016-0189
PO BOX 190, DALY CITY, CA 94016-0190
PO BOX 191, DALY CITY, CA 94016-0191
PO BOX 192, DALY CITY, CA 94016-0192
PO BOX 193, DALY CITY, CA 94016-0193
PO BOX 194, DALY CITY, CA 94016-0194
PO BOX 195, DALY CITY, CA 94016-0195
PO BOX 196, DALY CITY, CA 94016-0196
PO BOX 197, DALY CITY, CA 94016-0197
PO BOX 198, DALY CITY, CA 94016-0198
PO BOX 199, DALY CITY, CA 94016-0199
PO BOX 200, DALY CITY, CA 94016-0200
PO BOX 201, DALY CITY, CA 94016-0201
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