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 432040, SAN YSIDRO, CA 92143-2040
PO BOX 432041, SAN YSIDRO, CA 92143-2041
PO BOX 432042, SAN YSIDRO, CA 92143-2042
PO BOX 432043, SAN YSIDRO, CA 92143-2043
PO BOX 432044, SAN YSIDRO, CA 92143-2044
PO BOX 432045, SAN YSIDRO, CA 92143-2045
PO BOX 432046, SAN YSIDRO, CA 92143-2046
PO BOX 432047, SAN YSIDRO, CA 92143-2047
PO BOX 432048, SAN YSIDRO, CA 92143-2048
PO BOX 432049, SAN YSIDRO, CA 92143-2049
PO BOX 432050, SAN YSIDRO, CA 92143-2050
PO BOX 432051, SAN YSIDRO, CA 92143-2051
PO BOX 432052, SAN YSIDRO, CA 92143-2052
PO BOX 432053, SAN YSIDRO, CA 92143-2053
PO BOX 432054, SAN YSIDRO, CA 92143-2054
PO BOX 432055, SAN YSIDRO, CA 92143-2055
PO BOX 432056, SAN YSIDRO, CA 92143-2056
PO BOX 432057, SAN YSIDRO, CA 92143-2057
PO BOX 432058, SAN YSIDRO, CA 92143-2058
PO BOX 432059, SAN YSIDRO, CA 92143-2059
PO BOX 432060, SAN YSIDRO, CA 92143-2060
PO BOX 432061, SAN YSIDRO, CA 92143-2061
PO BOX 432062, SAN YSIDRO, CA 92143-2062
PO BOX 432063, SAN YSIDRO, CA 92143-2063
PO BOX 432064, SAN YSIDRO, CA 92143-2064
PO BOX 432065, SAN YSIDRO, CA 92143-2065
PO BOX 432066, SAN YSIDRO, CA 92143-2066
PO BOX 432067, SAN YSIDRO, CA 92143-2067
PO BOX 432068, SAN YSIDRO, CA 92143-2068
PO BOX 432069, SAN YSIDRO, CA 92143-2069
PO BOX 432070, SAN YSIDRO, CA 92143-2070
PO BOX 432071, SAN YSIDRO, CA 92143-2071
PO BOX 432072, SAN YSIDRO, CA 92143-2072
PO BOX 432073, SAN YSIDRO, CA 92143-2073
PO BOX 432074, SAN YSIDRO, CA 92143-2074
PO BOX 432075, SAN YSIDRO, CA 92143-2075
PO BOX 432076, SAN YSIDRO, CA 92143-2076
PO BOX 432077, SAN YSIDRO, CA 92143-2077
PO BOX 432078, SAN YSIDRO, CA 92143-2078
PO BOX 432079, SAN YSIDRO, CA 92143-2079
PO BOX 432080, SAN YSIDRO, CA 92143-2080
PO BOX 432081, SAN YSIDRO, CA 92143-2081
PO BOX 432082, SAN YSIDRO, CA 92143-2082
PO BOX 432083, SAN YSIDRO, CA 92143-2083
PO BOX 432084, SAN YSIDRO, CA 92143-2084
PO BOX 432085, SAN YSIDRO, CA 92143-2085
PO BOX 432086, SAN YSIDRO, CA 92143-2086
PO BOX 432087, SAN YSIDRO, CA 92143-2087
PO BOX 432088, SAN YSIDRO, CA 92143-2088
PO BOX 432089, SAN YSIDRO, CA 92143-2089
PO BOX 432090, SAN YSIDRO, CA 92143-2090
PO BOX 432091, SAN YSIDRO, CA 92143-2091
PO BOX 432092, SAN YSIDRO, CA 92143-2092
PO BOX 432093, SAN YSIDRO, CA 92143-2093
PO BOX 432094, SAN YSIDRO, CA 92143-2094
PO BOX 432095, SAN YSIDRO, CA 92143-2095
PO BOX 432096, SAN YSIDRO, CA 92143-2096
PO BOX 432097, SAN YSIDRO, CA 92143-2097
PO BOX 432098, SAN YSIDRO, CA 92143-2098
PO BOX 432099, SAN YSIDRO, CA 92143-2099
PO BOX 432100, SAN YSIDRO, CA 92143-2100
PO BOX 432101, SAN YSIDRO, CA 92143-2101
PO BOX 432102, SAN YSIDRO, CA 92143-2102
PO BOX 432103, SAN YSIDRO, CA 92143-2103
PO BOX 432104, SAN YSIDRO, CA 92143-2104
PO BOX 432105, SAN YSIDRO, CA 92143-2105
PO BOX 432106, SAN YSIDRO, CA 92143-2106
PO BOX 432107, SAN YSIDRO, CA 92143-2107
PO BOX 432108, SAN YSIDRO, CA 92143-2108
PO BOX 432109, SAN YSIDRO, CA 92143-2109
PO BOX 432110, SAN YSIDRO, CA 92143-2110
PO BOX 432111, SAN YSIDRO, CA 92143-2111
PO BOX 432112, SAN YSIDRO, CA 92143-2112
PO BOX 432113, SAN YSIDRO, CA 92143-2113
PO BOX 432114, SAN YSIDRO, CA 92143-2114
PO BOX 432115, SAN YSIDRO, CA 92143-2115
PO BOX 432116, SAN YSIDRO, CA 92143-2116
PO BOX 432117, SAN YSIDRO, CA 92143-2117
PO BOX 432118, SAN YSIDRO, CA 92143-2118
PO BOX 432119, SAN YSIDRO, CA 92143-2119
PO BOX 432120, SAN YSIDRO, CA 92143-2120
PO BOX 432121, SAN YSIDRO, CA 92143-2121
PO BOX 432122, SAN YSIDRO, CA 92143-2122
PO BOX 432123, SAN YSIDRO, CA 92143-2123
PO BOX 432124, SAN YSIDRO, CA 92143-2124
PO BOX 432125, SAN YSIDRO, CA 92143-2125
PO BOX 432126, SAN YSIDRO, CA 92143-2126
PO BOX 432127, SAN YSIDRO, CA 92143-2127
PO BOX 432128, SAN YSIDRO, CA 92143-2128
PO BOX 432129, SAN YSIDRO, CA 92143-2129
PO BOX 432130, SAN YSIDRO, CA 92143-2130
PO BOX 432131, SAN YSIDRO, CA 92143-2131
PO BOX 432132, SAN YSIDRO, CA 92143-2132
PO BOX 432133, SAN YSIDRO, CA 92143-2133
PO BOX 432134, SAN YSIDRO, CA 92143-2134
PO BOX 432135, SAN YSIDRO, CA 92143-2135
PO BOX 432136, SAN YSIDRO, CA 92143-2136
PO BOX 432137, SAN YSIDRO, CA 92143-2137
PO BOX 432138, SAN YSIDRO, CA 92143-2138
PO BOX 432139, SAN YSIDRO, CA 92143-2139
PO BOX 432140, SAN YSIDRO, CA 92143-2140
PO BOX 432141, SAN YSIDRO, CA 92143-2141
PO BOX 432142, SAN YSIDRO, CA 92143-2142
PO BOX 432143, SAN YSIDRO, CA 92143-2143
PO BOX 432144, SAN YSIDRO, CA 92143-2144
PO BOX 432145, SAN YSIDRO, CA 92143-2145
PO BOX 432146, SAN YSIDRO, CA 92143-2146
PO BOX 432147, SAN YSIDRO, CA 92143-2147
PO BOX 432148, SAN YSIDRO, CA 92143-2148
PO BOX 432149, SAN YSIDRO, CA 92143-2149
PO BOX 432150, SAN YSIDRO, CA 92143-2150
PO BOX 432151, SAN YSIDRO, CA 92143-2151
PO BOX 432152, SAN YSIDRO, CA 92143-2152
PO BOX 432153, SAN YSIDRO, CA 92143-2153
PO BOX 432154, SAN YSIDRO, CA 92143-2154
PO BOX 432155, SAN YSIDRO, CA 92143-2155
PO BOX 432156, SAN YSIDRO, CA 92143-2156
PO BOX 432157, SAN YSIDRO, CA 92143-2157
PO BOX 432158, SAN YSIDRO, CA 92143-2158
PO BOX 432159, SAN YSIDRO, CA 92143-2159
PO BOX 432160, SAN YSIDRO, CA 92143-2160
PO BOX 432161, SAN YSIDRO, CA 92143-2161
PO BOX 432162, SAN YSIDRO, CA 92143-2162
PO BOX 432163, SAN YSIDRO, CA 92143-2163
PO BOX 432164, SAN YSIDRO, CA 92143-2164
PO BOX 432165, SAN YSIDRO, CA 92143-2165
PO BOX 432166, SAN YSIDRO, CA 92143-2166
PO BOX 432167, SAN YSIDRO, CA 92143-2167
PO BOX 432168, SAN YSIDRO, CA 92143-2168
PO BOX 432169, SAN YSIDRO, CA 92143-2169
PO BOX 432170, SAN YSIDRO, CA 92143-2170
PO BOX 432171, SAN YSIDRO, CA 92143-2171
PO BOX 432172, SAN YSIDRO, CA 92143-2172
PO BOX 432173, SAN YSIDRO, CA 92143-2173
PO BOX 432174, SAN YSIDRO, CA 92143-2174
PO BOX 432175, SAN YSIDRO, CA 92143-2175
PO BOX 432176, SAN YSIDRO, CA 92143-2176
PO BOX 432177, SAN YSIDRO, CA 92143-2177
PO BOX 432178, SAN YSIDRO, CA 92143-2178
PO BOX 432179, SAN YSIDRO, CA 92143-2179
PO BOX 432180, SAN YSIDRO, CA 92143-2180
PO BOX 432181, SAN YSIDRO, CA 92143-2181
PO BOX 432182, SAN YSIDRO, CA 92143-2182
PO BOX 432183, SAN YSIDRO, CA 92143-2183
PO BOX 432184, SAN YSIDRO, CA 92143-2184
PO BOX 432185, SAN YSIDRO, CA 92143-2185
PO BOX 432186, SAN YSIDRO, CA 92143-2186
PO BOX 432187, SAN YSIDRO, CA 92143-2187
PO BOX 432188, SAN YSIDRO, CA 92143-2188
PO BOX 432189, SAN YSIDRO, CA 92143-2189
PO BOX 432190, SAN YSIDRO, CA 92143-2190
PO BOX 432191, SAN YSIDRO, CA 92143-2191
PO BOX 432192, SAN YSIDRO, CA 92143-2192
PO BOX 432193, SAN YSIDRO, CA 92143-2193
PO BOX 432194, SAN YSIDRO, CA 92143-2194
PO BOX 432195, SAN YSIDRO, CA 92143-2195
PO BOX 432196, SAN YSIDRO, CA 92143-2196
PO BOX 432197, SAN YSIDRO, CA 92143-2197
PO BOX 432198, SAN YSIDRO, CA 92143-2198
PO BOX 432199, SAN YSIDRO, CA 92143-2199
PO BOX 432200, SAN YSIDRO, CA 92143-2200
PO BOX 432201, SAN YSIDRO, CA 92143-2201
PO BOX 432202, SAN YSIDRO, CA 92143-2202
PO BOX 432203, SAN YSIDRO, CA 92143-2203
PO BOX 432204, SAN YSIDRO, CA 92143-2204
PO BOX 432205, SAN YSIDRO, CA 92143-2205
PO BOX 432206, SAN YSIDRO, CA 92143-2206
PO BOX 432207, SAN YSIDRO, CA 92143-2207
PO BOX 432208, SAN YSIDRO, CA 92143-2208
PO BOX 432209, SAN YSIDRO, CA 92143-2209
PO BOX 432210, SAN YSIDRO, CA 92143-2210
PO BOX 432211, SAN YSIDRO, CA 92143-2211
PO BOX 432212, SAN YSIDRO, CA 92143-2212
PO BOX 432213, SAN YSIDRO, CA 92143-2213
PO BOX 432214, SAN YSIDRO, CA 92143-2214
PO BOX 432215, SAN YSIDRO, CA 92143-2215
PO BOX 432216, SAN YSIDRO, CA 92143-2216
PO BOX 432217, SAN YSIDRO, CA 92143-2217
PO BOX 432218, SAN YSIDRO, CA 92143-2218
PO BOX 432219, SAN YSIDRO, CA 92143-2219
PO BOX 432220, SAN YSIDRO, CA 92143-2220
PO BOX 432221, SAN YSIDRO, CA 92143-2221
PO BOX 432222, SAN YSIDRO, CA 92143-2222
PO BOX 432223, SAN YSIDRO, CA 92143-2223
PO BOX 432224, SAN YSIDRO, CA 92143-2224
PO BOX 432225, SAN YSIDRO, CA 92143-2225
PO BOX 432226, SAN YSIDRO, CA 92143-2226
PO BOX 432227, SAN YSIDRO, CA 92143-2227
PO BOX 432228, SAN YSIDRO, CA 92143-2228
PO BOX 432229, SAN YSIDRO, CA 92143-2229
PO BOX 432230, SAN YSIDRO, CA 92143-2230
PO BOX 432231, SAN YSIDRO, CA 92143-2231
PO BOX 432232, SAN YSIDRO, CA 92143-2232
PO BOX 432233, SAN YSIDRO, CA 92143-2233
PO BOX 432234, SAN YSIDRO, CA 92143-2234
PO BOX 432235, SAN YSIDRO, CA 92143-2235
PO BOX 432236, SAN YSIDRO, CA 92143-2236
PO BOX 432237, SAN YSIDRO, CA 92143-2237
PO BOX 432238, SAN YSIDRO, CA 92143-2238
PO BOX 432239, SAN YSIDRO, CA 92143-2239
PO BOX 432240, SAN YSIDRO, CA 92143-2240
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