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 642000, PITTSBURGH, PA 15264-2000
PO BOX 642001, PITTSBURGH, PA 15264-2001
PO BOX 642002, PITTSBURGH, PA 15264-2002
PO BOX 642003, PITTSBURGH, PA 15264-2003
PO BOX 642004, PITTSBURGH, PA 15264-2004
PO BOX 642005, PITTSBURGH, PA 15264-2005
PO BOX 642006, PITTSBURGH, PA 15264-2006
PO BOX 642007, PITTSBURGH, PA 15264-2007
PO BOX 642008, PITTSBURGH, PA 15264-2008
PO BOX 642009, PITTSBURGH, PA 15264-2009
PO BOX 642010, PITTSBURGH, PA 15264-2010
PO BOX 642011, PITTSBURGH, PA 15264-2011
PO BOX 642012, PITTSBURGH, PA 15264-2012
PO BOX 642013, PITTSBURGH, PA 15264-2013
PO BOX 642014, PITTSBURGH, PA 15264-2014
PO BOX 642015, PITTSBURGH, PA 15264-2015
PO BOX 642016, PITTSBURGH, PA 15264-2016
PO BOX 642017, PITTSBURGH, PA 15264-2017
PO BOX 642018, PITTSBURGH, PA 15264-2018
PO BOX 642019, PITTSBURGH, PA 15264-2019
PO BOX 642020, PITTSBURGH, PA 15264-2020
PO BOX 642021, PITTSBURGH, PA 15264-2021
PO BOX 642022, PITTSBURGH, PA 15264-2022
PO BOX 642023, PITTSBURGH, PA 15264-2023
PO BOX 642024, PITTSBURGH, PA 15264-2024
PO BOX 642025, PITTSBURGH, PA 15264-2025
PO BOX 642026, PITTSBURGH, PA 15264-2026
PO BOX 642027, PITTSBURGH, PA 15264-2027
PO BOX 642028, PITTSBURGH, PA 15264-2028
PO BOX 642029, PITTSBURGH, PA 15264-2029
PO BOX 642030, PITTSBURGH, PA 15264-2030
PO BOX 642031, PITTSBURGH, PA 15264-2031
PO BOX 642032, PITTSBURGH, PA 15264-2032
PO BOX 642033, PITTSBURGH, PA 15264-2033
PO BOX 642034, PITTSBURGH, PA 15264-2034
PO BOX 642035, PITTSBURGH, PA 15264-2035
PO BOX 642036, PITTSBURGH, PA 15264-2036
PO BOX 642037, PITTSBURGH, PA 15264-2037
PO BOX 642038, PITTSBURGH, PA 15264-2038
PO BOX 642039, PITTSBURGH, PA 15264-2039
PO BOX 642040, PITTSBURGH, PA 15264-2040
PO BOX 642041, PITTSBURGH, PA 15264-2041
PO BOX 642042, PITTSBURGH, PA 15264-2042
PO BOX 642043, PITTSBURGH, PA 15264-2043
PO BOX 642044, PITTSBURGH, PA 15264-2044
PO BOX 642045, PITTSBURGH, PA 15264-2045
PO BOX 642046, PITTSBURGH, PA 15264-2046
PO BOX 642047, PITTSBURGH, PA 15264-2047
PO BOX 642048, PITTSBURGH, PA 15264-2048
PO BOX 642049, PITTSBURGH, PA 15264-2049
PO BOX 642050, PITTSBURGH, PA 15264-2050
PO BOX 642051, PITTSBURGH, PA 15264-2051
PO BOX 642052, PITTSBURGH, PA 15264-2052
PO BOX 642053, PITTSBURGH, PA 15264-2053
PO BOX 642054, PITTSBURGH, PA 15264-2054
PO BOX 642055, PITTSBURGH, PA 15264-2055
PO BOX 642056, PITTSBURGH, PA 15264-2056
PO BOX 642057, PITTSBURGH, PA 15264-2057
PO BOX 642058, PITTSBURGH, PA 15264-2058
PO BOX 642059, PITTSBURGH, PA 15264-2059
PO BOX 642060, PITTSBURGH, PA 15264-2060
PO BOX 642061, PITTSBURGH, PA 15264-2061
PO BOX 642062, PITTSBURGH, PA 15264-2062
PO BOX 642063, PITTSBURGH, PA 15264-2063
PO BOX 642064, PITTSBURGH, PA 15264-2064
PO BOX 642065, PITTSBURGH, PA 15264-2065
PO BOX 642066, PITTSBURGH, PA 15264-2066
PO BOX 642067, PITTSBURGH, PA 15264-2067
PO BOX 642068, PITTSBURGH, PA 15264-2068
PO BOX 642069, PITTSBURGH, PA 15264-2069
PO BOX 642070, PITTSBURGH, PA 15264-2070
PO BOX 642071, PITTSBURGH, PA 15264-2071
PO BOX 642072, PITTSBURGH, PA 15264-2072
PO BOX 642073, PITTSBURGH, PA 15264-2073
PO BOX 642074, PITTSBURGH, PA 15264-2074
PO BOX 642075, PITTSBURGH, PA 15264-2075
PO BOX 642076, PITTSBURGH, PA 15264-2076
PO BOX 642077, PITTSBURGH, PA 15264-2077
PO BOX 642078, PITTSBURGH, PA 15264-2078
PO BOX 642079, PITTSBURGH, PA 15264-2079
PO BOX 642080, PITTSBURGH, PA 15264-2080
PO BOX 642081, PITTSBURGH, PA 15264-2081
PO BOX 642082, PITTSBURGH, PA 15264-2082
PO BOX 642083, PITTSBURGH, PA 15264-2083
PO BOX 642084, PITTSBURGH, PA 15264-2084
PO BOX 642085, PITTSBURGH, PA 15264-2085
PO BOX 642086, PITTSBURGH, PA 15264-2086
PO BOX 642087, PITTSBURGH, PA 15264-2087
PO BOX 642088, PITTSBURGH, PA 15264-2088
PO BOX 642089, PITTSBURGH, PA 15264-2089
PO BOX 642090, PITTSBURGH, PA 15264-2090
PO BOX 642091, PITTSBURGH, PA 15264-2091
PO BOX 642092, PITTSBURGH, PA 15264-2092
PO BOX 642093, PITTSBURGH, PA 15264-2093
PO BOX 642094, PITTSBURGH, PA 15264-2094
PO BOX 642095, PITTSBURGH, PA 15264-2095
PO BOX 642096, PITTSBURGH, PA 15264-2096
PO BOX 642097, PITTSBURGH, PA 15264-2097
PO BOX 642098, PITTSBURGH, PA 15264-2098
PO BOX 642099, PITTSBURGH, PA 15264-2099
PO BOX 642100, PITTSBURGH, PA 15264-2100
PO BOX 642101, PITTSBURGH, PA 15264-2101
PO BOX 642102, PITTSBURGH, PA 15264-2102
PO BOX 642103, PITTSBURGH, PA 15264-2103
PO BOX 642104, PITTSBURGH, PA 15264-2104
PO BOX 642105, PITTSBURGH, PA 15264-2105
PO BOX 642106, PITTSBURGH, PA 15264-2106
PO BOX 642107, PITTSBURGH, PA 15264-2107
PO BOX 642108, PITTSBURGH, PA 15264-2108
PO BOX 642109, PITTSBURGH, PA 15264-2109
PO BOX 642110, PITTSBURGH, PA 15264-2110
PO BOX 642111, PITTSBURGH, PA 15264-2111
PO BOX 642112, PITTSBURGH, PA 15264-2112
PO BOX 642113, PITTSBURGH, PA 15264-2113
PO BOX 642114, PITTSBURGH, PA 15264-2114
PO BOX 642115, PITTSBURGH, PA 15264-2115
PO BOX 642116, PITTSBURGH, PA 15264-2116
PO BOX 642117, PITTSBURGH, PA 15264-2117
PO BOX 642118, PITTSBURGH, PA 15264-2118
PO BOX 642119, PITTSBURGH, PA 15264-2119
PO BOX 642120, PITTSBURGH, PA 15264-2120
PO BOX 642121, PITTSBURGH, PA 15264-2121
PO BOX 642122, PITTSBURGH, PA 15264-2122
PO BOX 642123, PITTSBURGH, PA 15264-2123
PO BOX 642124, PITTSBURGH, PA 15264-2124
PO BOX 642125, PITTSBURGH, PA 15264-2125
PO BOX 642126, PITTSBURGH, PA 15264-2126
PO BOX 642127, PITTSBURGH, PA 15264-2127
PO BOX 642128, PITTSBURGH, PA 15264-2128
PO BOX 642129, PITTSBURGH, PA 15264-2129
PO BOX 642130, PITTSBURGH, PA 15264-2130
PO BOX 642131, PITTSBURGH, PA 15264-2131
PO BOX 642132, PITTSBURGH, PA 15264-2132
PO BOX 642133, PITTSBURGH, PA 15264-2133
PO BOX 642134, PITTSBURGH, PA 15264-2134
PO BOX 642135, PITTSBURGH, PA 15264-2135
PO BOX 642136, PITTSBURGH, PA 15264-2136
PO BOX 642137, PITTSBURGH, PA 15264-2137
PO BOX 642138, PITTSBURGH, PA 15264-2138
PO BOX 642139, PITTSBURGH, PA 15264-2139
PO BOX 642140, PITTSBURGH, PA 15264-2140
PO BOX 642141, PITTSBURGH, PA 15264-2141
PO BOX 642142, PITTSBURGH, PA 15264-2142
PO BOX 642143, PITTSBURGH, PA 15264-2143
PO BOX 642144, PITTSBURGH, PA 15264-2144
PO BOX 642145, PITTSBURGH, PA 15264-2145
PO BOX 642146, PITTSBURGH, PA 15264-2146
PO BOX 642147, PITTSBURGH, PA 15264-2147
PO BOX 642148, PITTSBURGH, PA 15264-2148
PO BOX 642149, PITTSBURGH, PA 15264-2149
PO BOX 642150, PITTSBURGH, PA 15264-2150
PO BOX 642151, PITTSBURGH, PA 15264-2151
PO BOX 642152, PITTSBURGH, PA 15264-2152
PO BOX 642153, PITTSBURGH, PA 15264-2153
PO BOX 642154, PITTSBURGH, PA 15264-2154
PO BOX 642155, PITTSBURGH, PA 15264-2155
PO BOX 642156, PITTSBURGH, PA 15264-2156
PO BOX 642157, PITTSBURGH, PA 15264-2157
PO BOX 642158, PITTSBURGH, PA 15264-2158
PO BOX 642159, PITTSBURGH, PA 15264-2159
PO BOX 642160, PITTSBURGH, PA 15264-2160
PO BOX 642161, PITTSBURGH, PA 15264-2161
PO BOX 642162, PITTSBURGH, PA 15264-2162
PO BOX 642163, PITTSBURGH, PA 15264-2163
PO BOX 642164, PITTSBURGH, PA 15264-2164
PO BOX 642165, PITTSBURGH, PA 15264-2165
PO BOX 642166, PITTSBURGH, PA 15264-2166
PO BOX 642167, PITTSBURGH, PA 15264-2167
PO BOX 642168, PITTSBURGH, PA 15264-2168
PO BOX 642169, PITTSBURGH, PA 15264-2169
PO BOX 642170, PITTSBURGH, PA 15264-2170
PO BOX 642171, PITTSBURGH, PA 15264-2171
PO BOX 642172, PITTSBURGH, PA 15264-2172
PO BOX 642173, PITTSBURGH, PA 15264-2173
PO BOX 642174, PITTSBURGH, PA 15264-2174
PO BOX 642175, PITTSBURGH, PA 15264-2175
PO BOX 642176, PITTSBURGH, PA 15264-2176
PO BOX 642177, PITTSBURGH, PA 15264-2177
PO BOX 642178, PITTSBURGH, PA 15264-2178
PO BOX 642179, PITTSBURGH, PA 15264-2179
PO BOX 642180, PITTSBURGH, PA 15264-2180
PO BOX 642181, PITTSBURGH, PA 15264-2181
PO BOX 642182, PITTSBURGH, PA 15264-2182
PO BOX 642183, PITTSBURGH, PA 15264-2183
PO BOX 642184, PITTSBURGH, PA 15264-2184
PO BOX 642185, PITTSBURGH, PA 15264-2185
PO BOX 642186, PITTSBURGH, PA 15264-2186
PO BOX 642187, PITTSBURGH, PA 15264-2187
PO BOX 642188, PITTSBURGH, PA 15264-2188
PO BOX 642189, PITTSBURGH, PA 15264-2189
PO BOX 642190, PITTSBURGH, PA 15264-2190
PO BOX 642191, PITTSBURGH, PA 15264-2191
PO BOX 642192, PITTSBURGH, PA 15264-2192
PO BOX 642193, PITTSBURGH, PA 15264-2193
PO BOX 642194, PITTSBURGH, PA 15264-2194
PO BOX 642195, PITTSBURGH, PA 15264-2195
PO BOX 642196, PITTSBURGH, PA 15264-2196
PO BOX 642197, PITTSBURGH, PA 15264-2197
PO BOX 642198, PITTSBURGH, PA 15264-2198
PO BOX 642199, PITTSBURGH, PA 15264-2199
PO BOX 642200, PITTSBURGH, PA 15264-2200
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