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 2001, PORTERVILLE, CA 93258-2001
PO BOX 2002, PORTERVILLE, CA 93258-2002
PO BOX 2003, PORTERVILLE, CA 93258-2003
PO BOX 2004, PORTERVILLE, CA 93258-2004
PO BOX 2005, PORTERVILLE, CA 93258-2005
PO BOX 2006, PORTERVILLE, CA 93258-2006
PO BOX 2007, PORTERVILLE, CA 93258-2007
PO BOX 2008, PORTERVILLE, CA 93258-2008
PO BOX 2009, PORTERVILLE, CA 93258-2009
PO BOX 2010, PORTERVILLE, CA 93258-2010
PO BOX 2011, PORTERVILLE, CA 93258-2011
PO BOX 2012, PORTERVILLE, CA 93258-2012
PO BOX 2013, PORTERVILLE, CA 93258-2013
PO BOX 2014, PORTERVILLE, CA 93258-2014
PO BOX 2015, PORTERVILLE, CA 93258-2015
PO BOX 2016, PORTERVILLE, CA 93258-2016
PO BOX 2017, PORTERVILLE, CA 93258-2017
PO BOX 2018, PORTERVILLE, CA 93258-2018
PO BOX 2019, PORTERVILLE, CA 93258-2019
PO BOX 2020, PORTERVILLE, CA 93258-2020
PO BOX 2021, PORTERVILLE, CA 93258-2021
PO BOX 2022, PORTERVILLE, CA 93258-2022
PO BOX 2023, PORTERVILLE, CA 93258-2023
PO BOX 2024, PORTERVILLE, CA 93258-2024
PO BOX 2025, PORTERVILLE, CA 93258-2025
PO BOX 2026, PORTERVILLE, CA 93258-2026
PO BOX 2027, PORTERVILLE, CA 93258-2027
PO BOX 2028, PORTERVILLE, CA 93258-2028
PO BOX 2029, PORTERVILLE, CA 93258-2029
PO BOX 2030, PORTERVILLE, CA 93258-2030
PO BOX 2031, PORTERVILLE, CA 93258-2031
PO BOX 2032, PORTERVILLE, CA 93258-2032
PO BOX 2033, PORTERVILLE, CA 93258-2033
PO BOX 2034, PORTERVILLE, CA 93258-2034
PO BOX 2035, PORTERVILLE, CA 93258-2035
PO BOX 2036, PORTERVILLE, CA 93258-2036
PO BOX 2037, PORTERVILLE, CA 93258-2037
PO BOX 2038, PORTERVILLE, CA 93258-2038
PO BOX 2039, PORTERVILLE, CA 93258-2039
PO BOX 2040, PORTERVILLE, CA 93258-2040
PO BOX 2041, PORTERVILLE, CA 93258-2041
PO BOX 2042, PORTERVILLE, CA 93258-2042
PO BOX 2043, PORTERVILLE, CA 93258-2043
PO BOX 2044, PORTERVILLE, CA 93258-2044
PO BOX 2045, PORTERVILLE, CA 93258-2045
PO BOX 2046, PORTERVILLE, CA 93258-2046
PO BOX 2047, PORTERVILLE, CA 93258-2047
PO BOX 2048, PORTERVILLE, CA 93258-2048
PO BOX 2049, PORTERVILLE, CA 93258-2049
PO BOX 2050, PORTERVILLE, CA 93258-2050
PO BOX 2051, PORTERVILLE, CA 93258-2051
PO BOX 2052, PORTERVILLE, CA 93258-2052
PO BOX 2053, PORTERVILLE, CA 93258-2053
PO BOX 2054, PORTERVILLE, CA 93258-2054
PO BOX 2055, PORTERVILLE, CA 93258-2055
PO BOX 2056, PORTERVILLE, CA 93258-2056
PO BOX 2057, PORTERVILLE, CA 93258-2057
PO BOX 2058, PORTERVILLE, CA 93258-2058
PO BOX 2059, PORTERVILLE, CA 93258-2059
PO BOX 2060, PORTERVILLE, CA 93258-2060
PO BOX 2061, PORTERVILLE, CA 93258-2061
PO BOX 2062, PORTERVILLE, CA 93258-2062
PO BOX 2063, PORTERVILLE, CA 93258-2063
PO BOX 2064, PORTERVILLE, CA 93258-2064
PO BOX 2065, PORTERVILLE, CA 93258-2065
PO BOX 2066, PORTERVILLE, CA 93258-2066
PO BOX 2067, PORTERVILLE, CA 93258-2067
PO BOX 2068, PORTERVILLE, CA 93258-2068
PO BOX 2069, PORTERVILLE, CA 93258-2069
PO BOX 2070, PORTERVILLE, CA 93258-2070
PO BOX 2071, PORTERVILLE, CA 93258-2071
PO BOX 2072, PORTERVILLE, CA 93258-2072
PO BOX 2073, PORTERVILLE, CA 93258-2073
PO BOX 2074, PORTERVILLE, CA 93258-2074
PO BOX 2075, PORTERVILLE, CA 93258-2075
PO BOX 2076, PORTERVILLE, CA 93258-2076
PO BOX 2077, PORTERVILLE, CA 93258-2077
PO BOX 2078, PORTERVILLE, CA 93258-2078
PO BOX 2079, PORTERVILLE, CA 93258-2079
PO BOX 2080, PORTERVILLE, CA 93258-2080
PO BOX 2081, PORTERVILLE, CA 93258-2081
PO BOX 2082, PORTERVILLE, CA 93258-2082
PO BOX 2083, PORTERVILLE, CA 93258-2083
PO BOX 2084, PORTERVILLE, CA 93258-2084
PO BOX 2085, PORTERVILLE, CA 93258-2085
PO BOX 2086, PORTERVILLE, CA 93258-2086
PO BOX 2087, PORTERVILLE, CA 93258-2087
PO BOX 2088, PORTERVILLE, CA 93258-2088
PO BOX 2089, PORTERVILLE, CA 93258-2089
PO BOX 2090, PORTERVILLE, CA 93258-2090
PO BOX 2091, PORTERVILLE, CA 93258-2091
PO BOX 2092, PORTERVILLE, CA 93258-2092
PO BOX 2093, PORTERVILLE, CA 93258-2093
PO BOX 2094, PORTERVILLE, CA 93258-2094
PO BOX 2095, PORTERVILLE, CA 93258-2095
PO BOX 2096, PORTERVILLE, CA 93258-2096
PO BOX 2097, PORTERVILLE, CA 93258-2097
PO BOX 2098, PORTERVILLE, CA 93258-2098
PO BOX 2099, PORTERVILLE, CA 93258-2099
PO BOX 2100, PORTERVILLE, CA 93258-2100
PO BOX 2101, PORTERVILLE, CA 93258-2101
PO BOX 2102, PORTERVILLE, CA 93258-2102
PO BOX 2103, PORTERVILLE, CA 93258-2103
PO BOX 2104, PORTERVILLE, CA 93258-2104
PO BOX 2105, PORTERVILLE, CA 93258-2105
PO BOX 2106, PORTERVILLE, CA 93258-2106
PO BOX 2107, PORTERVILLE, CA 93258-2107
PO BOX 2108, PORTERVILLE, CA 93258-2108
PO BOX 2109, PORTERVILLE, CA 93258-2109
PO BOX 2110, PORTERVILLE, CA 93258-2110
PO BOX 2111, PORTERVILLE, CA 93258-2111
PO BOX 2112, PORTERVILLE, CA 93258-2112
PO BOX 2113, PORTERVILLE, CA 93258-2113
PO BOX 2114, PORTERVILLE, CA 93258-2114
PO BOX 2115, PORTERVILLE, CA 93258-2115
PO BOX 2116, PORTERVILLE, CA 93258-2116
PO BOX 2117, PORTERVILLE, CA 93258-2117
PO BOX 2118, PORTERVILLE, CA 93258-2118
PO BOX 2119, PORTERVILLE, CA 93258-2119
PO BOX 2120, PORTERVILLE, CA 93258-2120
PO BOX 2121, PORTERVILLE, CA 93258-2121
PO BOX 2122, PORTERVILLE, CA 93258-2122
PO BOX 2123, PORTERVILLE, CA 93258-2123
PO BOX 2124, PORTERVILLE, CA 93258-2124
PO BOX 2125, PORTERVILLE, CA 93258-2125
PO BOX 2126, PORTERVILLE, CA 93258-2126
PO BOX 2127, PORTERVILLE, CA 93258-2127
PO BOX 2128, PORTERVILLE, CA 93258-2128
PO BOX 2129, PORTERVILLE, CA 93258-2129
PO BOX 2130, PORTERVILLE, CA 93258-2130
PO BOX 2131, PORTERVILLE, CA 93258-2131
PO BOX 2132, PORTERVILLE, CA 93258-2132
PO BOX 2133, PORTERVILLE, CA 93258-2133
PO BOX 2134, PORTERVILLE, CA 93258-2134
PO BOX 2135, PORTERVILLE, CA 93258-2135
PO BOX 2136, PORTERVILLE, CA 93258-2136
PO BOX 2137, PORTERVILLE, CA 93258-2137
PO BOX 2138, PORTERVILLE, CA 93258-2138
PO BOX 2139, PORTERVILLE, CA 93258-2139
PO BOX 2140, PORTERVILLE, CA 93258-2140
PO BOX 2141, PORTERVILLE, CA 93258-2141
PO BOX 2142, PORTERVILLE, CA 93258-2142
PO BOX 2143, PORTERVILLE, CA 93258-2143
PO BOX 2144, PORTERVILLE, CA 93258-2144
PO BOX 2145, PORTERVILLE, CA 93258-2145
PO BOX 2146, PORTERVILLE, CA 93258-2146
PO BOX 2147, PORTERVILLE, CA 93258-2147
PO BOX 2148, PORTERVILLE, CA 93258-2148
PO BOX 2149, PORTERVILLE, CA 93258-2149
PO BOX 2150, PORTERVILLE, CA 93258-2150
PO BOX 2151, PORTERVILLE, CA 93258-2151
PO BOX 2152, PORTERVILLE, CA 93258-2152
PO BOX 2153, PORTERVILLE, CA 93258-2153
PO BOX 2154, PORTERVILLE, CA 93258-2154
PO BOX 2155, PORTERVILLE, CA 93258-2155
PO BOX 2156, PORTERVILLE, CA 93258-2156
PO BOX 2157, PORTERVILLE, CA 93258-2157
PO BOX 2158, PORTERVILLE, CA 93258-2158
PO BOX 2159, PORTERVILLE, CA 93258-2159
PO BOX 2160, PORTERVILLE, CA 93258-2160
PO BOX 2161, PORTERVILLE, CA 93258-2161
PO BOX 2162, PORTERVILLE, CA 93258-2162
PO BOX 2163, PORTERVILLE, CA 93258-2163
PO BOX 2164, PORTERVILLE, CA 93258-2164
PO BOX 2165, PORTERVILLE, CA 93258-2165
PO BOX 2166, PORTERVILLE, CA 93258-2166
PO BOX 2167, PORTERVILLE, CA 93258-2167
PO BOX 2168, PORTERVILLE, CA 93258-2168
PO BOX 2169, PORTERVILLE, CA 93258-2169
PO BOX 2170, PORTERVILLE, CA 93258-2170
PO BOX 2171, PORTERVILLE, CA 93258-2171
PO BOX 2172, PORTERVILLE, CA 93258-2172
PO BOX 2173, PORTERVILLE, CA 93258-2173
PO BOX 2174, PORTERVILLE, CA 93258-2174
PO BOX 2175, PORTERVILLE, CA 93258-2175
PO BOX 2176, PORTERVILLE, CA 93258-2176
PO BOX 2177, PORTERVILLE, CA 93258-2177
PO BOX 2178, PORTERVILLE, CA 93258-2178
PO BOX 2179, PORTERVILLE, CA 93258-2179
PO BOX 2180, PORTERVILLE, CA 93258-2180
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