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 71, EL CENTRO, CA 92244-0071
PO BOX 72, EL CENTRO, CA 92244-0072
PO BOX 73, EL CENTRO, CA 92244-0073
PO BOX 74, EL CENTRO, CA 92244-0074
PO BOX 75, EL CENTRO, CA 92244-0075
PO BOX 76, EL CENTRO, CA 92244-0076
PO BOX 77, EL CENTRO, CA 92244-0077
PO BOX 78, EL CENTRO, CA 92244-0078
PO BOX 79, EL CENTRO, CA 92244-0079
PO BOX 80, EL CENTRO, CA 92244-0080
PO BOX 81, EL CENTRO, CA 92244-0081
PO BOX 82, EL CENTRO, CA 92244-0082
PO BOX 83, EL CENTRO, CA 92244-0083
PO BOX 84, EL CENTRO, CA 92244-0084
PO BOX 85, EL CENTRO, CA 92244-0085
PO BOX 86, EL CENTRO, CA 92244-0086
PO BOX 87, EL CENTRO, CA 92244-0087
PO BOX 88, EL CENTRO, CA 92244-0088
PO BOX 89, EL CENTRO, CA 92244-0089
PO BOX 90, EL CENTRO, CA 92244-0090
PO BOX 91, EL CENTRO, CA 92244-0091
PO BOX 92, EL CENTRO, CA 92244-0092
PO BOX 93, EL CENTRO, CA 92244-0093
PO BOX 94, EL CENTRO, CA 92244-0094
PO BOX 95, EL CENTRO, CA 92244-0095
PO BOX 96, EL CENTRO, CA 92244-0096
PO BOX 97, EL CENTRO, CA 92244-0097
PO BOX 98, EL CENTRO, CA 92244-0098
PO BOX 99, EL CENTRO, CA 92244-0099
PO BOX 100, EL CENTRO, CA 92244-0100
PO BOX 101, EL CENTRO, CA 92244-0101
PO BOX 102, EL CENTRO, CA 92244-0102
PO BOX 103, EL CENTRO, CA 92244-0103
PO BOX 104, EL CENTRO, CA 92244-0104
PO BOX 105, EL CENTRO, CA 92244-0105
PO BOX 106, EL CENTRO, CA 92244-0106
PO BOX 107, EL CENTRO, CA 92244-0107
PO BOX 108, EL CENTRO, CA 92244-0108
PO BOX 109, EL CENTRO, CA 92244-0109
PO BOX 110, EL CENTRO, CA 92244-0110
PO BOX 111, EL CENTRO, CA 92244-0111
PO BOX 112, EL CENTRO, CA 92244-0112
PO BOX 113, EL CENTRO, CA 92244-0113
PO BOX 114, EL CENTRO, CA 92244-0114
PO BOX 115, EL CENTRO, CA 92244-0115
PO BOX 116, EL CENTRO, CA 92244-0116
PO BOX 117, EL CENTRO, CA 92244-0117
PO BOX 118, EL CENTRO, CA 92244-0118
PO BOX 119, EL CENTRO, CA 92244-0119
PO BOX 120, EL CENTRO, CA 92244-0120
PO BOX 121, EL CENTRO, CA 92244-0121
PO BOX 122, EL CENTRO, CA 92244-0122
PO BOX 123, EL CENTRO, CA 92244-0123
PO BOX 124, EL CENTRO, CA 92244-0124
PO BOX 125, EL CENTRO, CA 92244-0125
PO BOX 126, EL CENTRO, CA 92244-0126
PO BOX 127, EL CENTRO, CA 92244-0127
PO BOX 128, EL CENTRO, CA 92244-0128
PO BOX 129, EL CENTRO, CA 92244-0129
PO BOX 130, EL CENTRO, CA 92244-0130
PO BOX 131, EL CENTRO, CA 92244-0131
PO BOX 132, EL CENTRO, CA 92244-0132
PO BOX 133, EL CENTRO, CA 92244-0133
PO BOX 134, EL CENTRO, CA 92244-0134
PO BOX 135, EL CENTRO, CA 92244-0135
PO BOX 136, EL CENTRO, CA 92244-0136
PO BOX 137, EL CENTRO, CA 92244-0137
PO BOX 138, EL CENTRO, CA 92244-0138
PO BOX 139, EL CENTRO, CA 92244-0139
PO BOX 140, EL CENTRO, CA 92244-0140
PO BOX 141, EL CENTRO, CA 92244-0141
PO BOX 142, EL CENTRO, CA 92244-0142
PO BOX 143, EL CENTRO, CA 92244-0143
PO BOX 144, EL CENTRO, CA 92244-0144
PO BOX 145, EL CENTRO, CA 92244-0145
PO BOX 146, EL CENTRO, CA 92244-0146
PO BOX 147, EL CENTRO, CA 92244-0147
PO BOX 148, EL CENTRO, CA 92244-0148
PO BOX 149, EL CENTRO, CA 92244-0149
PO BOX 150, EL CENTRO, CA 92244-0150
PO BOX 151, EL CENTRO, CA 92244-0151
PO BOX 152, EL CENTRO, CA 92244-0152
PO BOX 153, EL CENTRO, CA 92244-0153
PO BOX 154, EL CENTRO, CA 92244-0154
PO BOX 155, EL CENTRO, CA 92244-0155
PO BOX 156, EL CENTRO, CA 92244-0156
PO BOX 157, EL CENTRO, CA 92244-0157
PO BOX 158, EL CENTRO, CA 92244-0158
PO BOX 159, EL CENTRO, CA 92244-0159
PO BOX 160, EL CENTRO, CA 92244-0160
PO BOX 161, EL CENTRO, CA 92244-0161
PO BOX 162, EL CENTRO, CA 92244-0162
PO BOX 163, EL CENTRO, CA 92244-0163
PO BOX 164, EL CENTRO, CA 92244-0164
PO BOX 165, EL CENTRO, CA 92244-0165
PO BOX 166, EL CENTRO, CA 92244-0166
PO BOX 167, EL CENTRO, CA 92244-0167
PO BOX 168, EL CENTRO, CA 92244-0168
PO BOX 169, EL CENTRO, CA 92244-0169
PO BOX 170, EL CENTRO, CA 92244-0170
PO BOX 171, EL CENTRO, CA 92244-0171
PO BOX 172, EL CENTRO, CA 92244-0172
PO BOX 173, EL CENTRO, CA 92244-0173
PO BOX 174, EL CENTRO, CA 92244-0174
PO BOX 175, EL CENTRO, CA 92244-0175
PO BOX 176, EL CENTRO, CA 92244-0176
PO BOX 177, EL CENTRO, CA 92244-0177
PO BOX 178, EL CENTRO, CA 92244-0178
PO BOX 179, EL CENTRO, CA 92244-0179
PO BOX 180, EL CENTRO, CA 92244-0180
PO BOX 181, EL CENTRO, CA 92244-0181
PO BOX 182, EL CENTRO, CA 92244-0182
PO BOX 183, EL CENTRO, CA 92244-0183
PO BOX 184, EL CENTRO, CA 92244-0184
PO BOX 185, EL CENTRO, CA 92244-0185
PO BOX 186, EL CENTRO, CA 92244-0186
PO BOX 187, EL CENTRO, CA 92244-0187
PO BOX 188, EL CENTRO, CA 92244-0188
PO BOX 189, EL CENTRO, CA 92244-0189
PO BOX 190, EL CENTRO, CA 92244-0190
PO BOX 191, EL CENTRO, CA 92244-0191
PO BOX 192, EL CENTRO, CA 92244-0192
PO BOX 193, EL CENTRO, CA 92244-0193
PO BOX 194, EL CENTRO, CA 92244-0194
PO BOX 195, EL CENTRO, CA 92244-0195
PO BOX 196, EL CENTRO, CA 92244-0196
PO BOX 197, EL CENTRO, CA 92244-0197
PO BOX 198, EL CENTRO, CA 92244-0198
PO BOX 199, EL CENTRO, CA 92244-0199
PO BOX 200, EL CENTRO, CA 92244-0200
PO BOX 201, EL CENTRO, CA 92244-0201
PO BOX 202, EL CENTRO, CA 92244-0202
PO BOX 203, EL CENTRO, CA 92244-0203
PO BOX 204, EL CENTRO, CA 92244-0204
PO BOX 205, EL CENTRO, CA 92244-0205
PO BOX 206, EL CENTRO, CA 92244-0206
PO BOX 207, EL CENTRO, CA 92244-0207
PO BOX 208, EL CENTRO, CA 92244-0208
PO BOX 209, EL CENTRO, CA 92244-0209
PO BOX 210, EL CENTRO, CA 92244-0210
PO BOX 211, EL CENTRO, CA 92244-0211
PO BOX 212, EL CENTRO, CA 92244-0212
PO BOX 213, EL CENTRO, CA 92244-0213
PO BOX 214, EL CENTRO, CA 92244-0214
PO BOX 215, EL CENTRO, CA 92244-0215
PO BOX 216, EL CENTRO, CA 92244-0216
PO BOX 217, EL CENTRO, CA 92244-0217
PO BOX 218, EL CENTRO, CA 92244-0218
PO BOX 219, EL CENTRO, CA 92244-0219
PO BOX 220, EL CENTRO, CA 92244-0220
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