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, SAN MATEO, CA 94401-0001
PO BOX 2, SAN MATEO, CA 94401-0002
PO BOX 3, SAN MATEO, CA 94401-0003
PO BOX 4, SAN MATEO, CA 94401-0004
PO BOX 5, SAN MATEO, CA 94401-0005
PO BOX 6, SAN MATEO, CA 94401-0006
PO BOX 7, SAN MATEO, CA 94401-0007
PO BOX 8, SAN MATEO, CA 94401-0008
PO BOX 9, SAN MATEO, CA 94401-0009
PO BOX 10, SAN MATEO, CA 94401-0010
PO BOX 11, SAN MATEO, CA 94401-0011
PO BOX 12, SAN MATEO, CA 94401-0012
PO BOX 13, SAN MATEO, CA 94401-0013
PO BOX 14, SAN MATEO, CA 94401-0014
PO BOX 15, SAN MATEO, CA 94401-0015
PO BOX 16, SAN MATEO, CA 94401-0016
PO BOX 17, SAN MATEO, CA 94401-0017
PO BOX 18, SAN MATEO, CA 94401-0018
PO BOX 19, SAN MATEO, CA 94401-0019
PO BOX 20, SAN MATEO, CA 94401-0020
PO BOX 21, SAN MATEO, CA 94401-0021
PO BOX 22, SAN MATEO, CA 94401-0022
PO BOX 23, SAN MATEO, CA 94401-0023
PO BOX 24, SAN MATEO, CA 94401-0024
PO BOX 25, SAN MATEO, CA 94401-0025
PO BOX 26, SAN MATEO, CA 94401-0026
PO BOX 27, SAN MATEO, CA 94401-0027
PO BOX 28, SAN MATEO, CA 94401-0028
PO BOX 29, SAN MATEO, CA 94401-0029
PO BOX 30, SAN MATEO, CA 94401-0030
PO BOX 31, SAN MATEO, CA 94401-0031
PO BOX 32, SAN MATEO, CA 94401-0032
PO BOX 33, SAN MATEO, CA 94401-0033
PO BOX 34, SAN MATEO, CA 94401-0034
PO BOX 35, SAN MATEO, CA 94401-0035
PO BOX 36, SAN MATEO, CA 94401-0036
PO BOX 37, SAN MATEO, CA 94401-0037
PO BOX 38, SAN MATEO, CA 94401-0038
PO BOX 39, SAN MATEO, CA 94401-0039
PO BOX 40, SAN MATEO, CA 94401-0040
PO BOX 41, SAN MATEO, CA 94401-0041
PO BOX 42, SAN MATEO, CA 94401-0042
PO BOX 43, SAN MATEO, CA 94401-0043
PO BOX 44, SAN MATEO, CA 94401-0044
PO BOX 45, SAN MATEO, CA 94401-0045
PO BOX 46, SAN MATEO, CA 94401-0046
PO BOX 47, SAN MATEO, CA 94401-0047
PO BOX 48, SAN MATEO, CA 94401-0048
PO BOX 49, SAN MATEO, CA 94401-0049
PO BOX 50, SAN MATEO, CA 94401-0050
PO BOX 51, SAN MATEO, CA 94401-0051
PO BOX 52, SAN MATEO, CA 94401-0052
PO BOX 53, SAN MATEO, CA 94401-0053
PO BOX 54, SAN MATEO, CA 94401-0054
PO BOX 55, SAN MATEO, CA 94401-0055
PO BOX 56, SAN MATEO, CA 94401-0056
PO BOX 57, SAN MATEO, CA 94401-0057
PO BOX 58, SAN MATEO, CA 94401-0058
PO BOX 59, SAN MATEO, CA 94401-0059
PO BOX 60, SAN MATEO, CA 94401-0060
PO BOX 61, SAN MATEO, CA 94401-0061
PO BOX 62, SAN MATEO, CA 94401-0062
PO BOX 63, SAN MATEO, CA 94401-0063
PO BOX 64, SAN MATEO, CA 94401-0064
PO BOX 65, SAN MATEO, CA 94401-0065
PO BOX 66, SAN MATEO, CA 94401-0066
PO BOX 67, SAN MATEO, CA 94401-0067
PO BOX 68, SAN MATEO, CA 94401-0068
PO BOX 69, SAN MATEO, CA 94401-0069
PO BOX 70, SAN MATEO, CA 94401-0070
PO BOX 71, SAN MATEO, CA 94401-0071
PO BOX 72, SAN MATEO, CA 94401-0072
PO BOX 73, SAN MATEO, CA 94401-0073
PO BOX 74, SAN MATEO, CA 94401-0074
PO BOX 75, SAN MATEO, CA 94401-0075
PO BOX 76, SAN MATEO, CA 94401-0076
PO BOX 77, SAN MATEO, CA 94401-0077
PO BOX 78, SAN MATEO, CA 94401-0078
PO BOX 79, SAN MATEO, CA 94401-0079
PO BOX 80, SAN MATEO, CA 94401-0080
PO BOX 81, SAN MATEO, CA 94401-0081
PO BOX 82, SAN MATEO, CA 94401-0082
PO BOX 83, SAN MATEO, CA 94401-0083
PO BOX 84, SAN MATEO, CA 94401-0084
PO BOX 85, SAN MATEO, CA 94401-0085
PO BOX 86, SAN MATEO, CA 94401-0086
PO BOX 87, SAN MATEO, CA 94401-0087
PO BOX 88, SAN MATEO, CA 94401-0088
PO BOX 89, SAN MATEO, CA 94401-0089
PO BOX 90, SAN MATEO, CA 94401-0090
PO BOX 91, SAN MATEO, CA 94401-0091
PO BOX 92, SAN MATEO, CA 94401-0092
PO BOX 93, SAN MATEO, CA 94401-0093
PO BOX 94, SAN MATEO, CA 94401-0094
PO BOX 95, SAN MATEO, CA 94401-0095
PO BOX 96, SAN MATEO, CA 94401-0096
PO BOX 97, SAN MATEO, CA 94401-0097
PO BOX 98, SAN MATEO, CA 94401-0098
PO BOX 99, SAN MATEO, CA 94401-0099
PO BOX 100, SAN MATEO, CA 94401-0100
PO BOX 101, SAN MATEO, CA 94401-0101
PO BOX 102, SAN MATEO, CA 94401-0102
PO BOX 103, SAN MATEO, CA 94401-0103
PO BOX 104, SAN MATEO, CA 94401-0104
PO BOX 105, SAN MATEO, CA 94401-0105
PO BOX 106, SAN MATEO, CA 94401-0106
PO BOX 107, SAN MATEO, CA 94401-0107
PO BOX 108, SAN MATEO, CA 94401-0108
PO BOX 109, SAN MATEO, CA 94401-0109
PO BOX 110, SAN MATEO, CA 94401-0110
PO BOX 111, SAN MATEO, CA 94401-0111
PO BOX 112, SAN MATEO, CA 94401-0112
PO BOX 113, SAN MATEO, CA 94401-0113
PO BOX 114, SAN MATEO, CA 94401-0114
PO BOX 115, SAN MATEO, CA 94401-0115
PO BOX 116, SAN MATEO, CA 94401-0116
PO BOX 117, SAN MATEO, CA 94401-0117
PO BOX 118, SAN MATEO, CA 94401-0118
PO BOX 119, SAN MATEO, CA 94401-0119
PO BOX 120, SAN MATEO, CA 94401-0120
PO BOX 121, SAN MATEO, CA 94401-0121
PO BOX 122, SAN MATEO, CA 94401-0122
PO BOX 123, SAN MATEO, CA 94401-0123
PO BOX 124, SAN MATEO, CA 94401-0124
PO BOX 125, SAN MATEO, CA 94401-0125
PO BOX 126, SAN MATEO, CA 94401-0126
PO BOX 127, SAN MATEO, CA 94401-0127
PO BOX 128, SAN MATEO, CA 94401-0128
PO BOX 129, SAN MATEO, CA 94401-0129
PO BOX 130, SAN MATEO, CA 94401-0130
PO BOX 131, SAN MATEO, CA 94401-0131
PO BOX 132, SAN MATEO, CA 94401-0132
PO BOX 133, SAN MATEO, CA 94401-0133
PO BOX 134, SAN MATEO, CA 94401-0134
PO BOX 135, SAN MATEO, CA 94401-0135
PO BOX 136, SAN MATEO, CA 94401-0136
PO BOX 137, SAN MATEO, CA 94401-0137
PO BOX 138, SAN MATEO, CA 94401-0138
PO BOX 139, SAN MATEO, CA 94401-0139
PO BOX 140, SAN MATEO, CA 94401-0140
PO BOX 141, SAN MATEO, CA 94401-0141
PO BOX 142, SAN MATEO, CA 94401-0142
PO BOX 143, SAN MATEO, CA 94401-0143
PO BOX 144, SAN MATEO, CA 94401-0144
PO BOX 145, SAN MATEO, CA 94401-0145
PO BOX 146, SAN MATEO, CA 94401-0146
PO BOX 147, SAN MATEO, CA 94401-0147
PO BOX 148, SAN MATEO, CA 94401-0148
PO BOX 149, SAN MATEO, CA 94401-0149
PO BOX 150, SAN MATEO, CA 94401-0150
PO BOX 151, SAN MATEO, CA 94401-0151
PO BOX 152, SAN MATEO, CA 94401-0152
PO BOX 153, SAN MATEO, CA 94401-0153
PO BOX 154, SAN MATEO, CA 94401-0154
PO BOX 155, SAN MATEO, CA 94401-0155
PO BOX 156, SAN MATEO, CA 94401-0156
PO BOX 157, SAN MATEO, CA 94401-0157
PO BOX 158, SAN MATEO, CA 94401-0158
PO BOX 159, SAN MATEO, CA 94401-0159
PO BOX 160, SAN MATEO, CA 94401-0160
PO BOX 161, SAN MATEO, CA 94401-0161
PO BOX 162, SAN MATEO, CA 94401-0162
PO BOX 163, SAN MATEO, CA 94401-0163
PO BOX 164, SAN MATEO, CA 94401-0164
PO BOX 165, SAN MATEO, CA 94401-0165
PO BOX 166, SAN MATEO, CA 94401-0166
PO BOX 167, SAN MATEO, CA 94401-0167
PO BOX 168, SAN MATEO, CA 94401-0168
PO BOX 169, SAN MATEO, CA 94401-0169
PO BOX 170, SAN MATEO, CA 94401-0170
PO BOX 171, SAN MATEO, CA 94401-0171
PO BOX 172, SAN MATEO, CA 94401-0172
PO BOX 173, SAN MATEO, CA 94401-0173
PO BOX 174, SAN MATEO, CA 94401-0174
PO BOX 175, SAN MATEO, CA 94401-0175
PO BOX 176, SAN MATEO, CA 94401-0176
PO BOX 177, SAN MATEO, CA 94401-0177
PO BOX 178, SAN MATEO, CA 94401-0178
PO BOX 179, SAN MATEO, CA 94401-0179
PO BOX 180, SAN MATEO, CA 94401-0180
PO BOX 181, SAN MATEO, CA 94401-0181
PO BOX 182, SAN MATEO, CA 94401-0182
PO BOX 183, SAN MATEO, CA 94401-0183
PO BOX 184, SAN MATEO, CA 94401-0184
PO BOX 185, SAN MATEO, CA 94401-0185
PO BOX 186, SAN MATEO, CA 94401-0186
PO BOX 187, SAN MATEO, CA 94401-0187
PO BOX 188, SAN MATEO, CA 94401-0188
PO BOX 189, SAN MATEO, CA 94401-0189
PO BOX 190, SAN MATEO, CA 94401-0190
PO BOX 191, SAN MATEO, CA 94401-0191
PO BOX 192, SAN MATEO, CA 94401-0192
PO BOX 193, SAN MATEO, CA 94401-0193
PO BOX 194, SAN MATEO, CA 94401-0194
PO BOX 195, SAN MATEO, CA 94401-0195
PO BOX 196, SAN MATEO, CA 94401-0196
PO BOX 197, SAN MATEO, CA 94401-0197
PO BOX 198, SAN MATEO, CA 94401-0198
PO BOX 199, SAN MATEO, CA 94401-0199
PO BOX 200, SAN MATEO, CA 94401-0200
PO BOX 201, SAN MATEO, CA 94401-0201
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