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 223003, PITTSBURGH, PA 15251-2003
PO BOX 223004, PITTSBURGH, PA 15251-2004
PO BOX 223005, PITTSBURGH, PA 15251-2005
PO BOX 223006, PITTSBURGH, PA 15251-2006
PO BOX 223007, PITTSBURGH, PA 15251-2007
PO BOX 223008, PITTSBURGH, PA 15251-2008
PO BOX 223009, PITTSBURGH, PA 15251-2009
PO BOX 223010, PITTSBURGH, PA 15251-2010
PO BOX 223011, PITTSBURGH, PA 15251-2011
PO BOX 223012, PITTSBURGH, PA 15251-2012
PO BOX 223013, PITTSBURGH, PA 15251-2013
PO BOX 223014, PITTSBURGH, PA 15251-2014
PO BOX 223015, PITTSBURGH, PA 15251-2015
PO BOX 223016, PITTSBURGH, PA 15251-2016
PO BOX 223017, PITTSBURGH, PA 15251-2017
PO BOX 223018, PITTSBURGH, PA 15251-2018
PO BOX 223019, PITTSBURGH, PA 15251-2019
PO BOX 223020, PITTSBURGH, PA 15251-2020
PO BOX 223021, PITTSBURGH, PA 15251-2021
PO BOX 223022, PITTSBURGH, PA 15251-2022
PO BOX 223023, PITTSBURGH, PA 15251-2023
PO BOX 223024, PITTSBURGH, PA 15251-2024
PO BOX 223025, PITTSBURGH, PA 15251-2025
PO BOX 223026, PITTSBURGH, PA 15251-2026
PO BOX 223027, PITTSBURGH, PA 15251-2027
PO BOX 223028, PITTSBURGH, PA 15251-2028
PO BOX 223029, PITTSBURGH, PA 15251-2029
PO BOX 223030, PITTSBURGH, PA 15251-2030
PO BOX 223031, PITTSBURGH, PA 15251-2031
PO BOX 223032, PITTSBURGH, PA 15251-2032
PO BOX 223033, PITTSBURGH, PA 15251-2033
PO BOX 223034, PITTSBURGH, PA 15251-2034
PO BOX 223035, PITTSBURGH, PA 15251-2035
PO BOX 223036, PITTSBURGH, PA 15251-2036
PO BOX 223037, PITTSBURGH, PA 15251-2037
PO BOX 223038, PITTSBURGH, PA 15251-2038
PO BOX 223039, PITTSBURGH, PA 15251-2039
PO BOX 223040, PITTSBURGH, PA 15251-2040
PO BOX 223041, PITTSBURGH, PA 15251-2041
PO BOX 223042, PITTSBURGH, PA 15251-2042
PO BOX 223043, PITTSBURGH, PA 15251-2043
PO BOX 223044, PITTSBURGH, PA 15251-2044
PO BOX 223045, PITTSBURGH, PA 15251-2045
PO BOX 223046, PITTSBURGH, PA 15251-2046
PO BOX 223047, PITTSBURGH, PA 15251-2047
PO BOX 223048, PITTSBURGH, PA 15251-2048
PO BOX 223049, PITTSBURGH, PA 15251-2049
PO BOX 223050, PITTSBURGH, PA 15251-2050
PO BOX 223051, PITTSBURGH, PA 15251-2051
PO BOX 223052, PITTSBURGH, PA 15251-2052
PO BOX 223053, PITTSBURGH, PA 15251-2053
PO BOX 223054, PITTSBURGH, PA 15251-2054
PO BOX 223055, PITTSBURGH, PA 15251-2055
PO BOX 223056, PITTSBURGH, PA 15251-2056
PO BOX 223057, PITTSBURGH, PA 15251-2057
PO BOX 223058, PITTSBURGH, PA 15251-2058
PO BOX 223059, PITTSBURGH, PA 15251-2059
PO BOX 223060, PITTSBURGH, PA 15251-2060
PO BOX 223061, PITTSBURGH, PA 15251-2061
PO BOX 223062, PITTSBURGH, PA 15251-2062
PO BOX 223063, PITTSBURGH, PA 15251-2063
PO BOX 223064, PITTSBURGH, PA 15251-2064
PO BOX 223065, PITTSBURGH, PA 15251-2065
PO BOX 223066, PITTSBURGH, PA 15251-2066
PO BOX 223067, PITTSBURGH, PA 15251-2067
PO BOX 223068, PITTSBURGH, PA 15251-2068
PO BOX 223069, PITTSBURGH, PA 15251-2069
PO BOX 223070, PITTSBURGH, PA 15251-2070
PO BOX 223071, PITTSBURGH, PA 15251-2071
PO BOX 223072, PITTSBURGH, PA 15251-2072
PO BOX 223073, PITTSBURGH, PA 15251-2073
PO BOX 223074, PITTSBURGH, PA 15251-2074
PO BOX 223075, PITTSBURGH, PA 15251-2075
PO BOX 223076, PITTSBURGH, PA 15251-2076
PO BOX 223077, PITTSBURGH, PA 15251-2077
PO BOX 223078, PITTSBURGH, PA 15251-2078
PO BOX 223079, PITTSBURGH, PA 15251-2079
PO BOX 223080, PITTSBURGH, PA 15251-2080
PO BOX 223081, PITTSBURGH, PA 15251-2081
PO BOX 223082, PITTSBURGH, PA 15251-2082
PO BOX 223083, PITTSBURGH, PA 15251-2083
PO BOX 223084, PITTSBURGH, PA 15251-2084
PO BOX 223085, PITTSBURGH, PA 15251-2085
PO BOX 223086, PITTSBURGH, PA 15251-2086
PO BOX 223087, PITTSBURGH, PA 15251-2087
PO BOX 223088, PITTSBURGH, PA 15251-2088
PO BOX 223089, PITTSBURGH, PA 15251-2089
PO BOX 223090, PITTSBURGH, PA 15251-2090
PO BOX 223091, PITTSBURGH, PA 15251-2091
PO BOX 223092, PITTSBURGH, PA 15251-2092
PO BOX 223093, PITTSBURGH, PA 15251-2093
PO BOX 223094, PITTSBURGH, PA 15251-2094
PO BOX 223095, PITTSBURGH, PA 15251-2095
PO BOX 223096, PITTSBURGH, PA 15251-2096
PO BOX 223097, PITTSBURGH, PA 15251-2097
PO BOX 223098, PITTSBURGH, PA 15251-2098
PO BOX 223099, PITTSBURGH, PA 15251-2099
PO BOX 223100, PITTSBURGH, PA 15251-2100
PO BOX 223101, PITTSBURGH, PA 15251-2101
PO BOX 223102, PITTSBURGH, PA 15251-2102
PO BOX 223103, PITTSBURGH, PA 15251-2103
PO BOX 223104, PITTSBURGH, PA 15251-2104
PO BOX 223105, PITTSBURGH, PA 15251-2105
PO BOX 223106, PITTSBURGH, PA 15251-2106
PO BOX 223107, PITTSBURGH, PA 15251-2107
PO BOX 223108, PITTSBURGH, PA 15251-2108
PO BOX 223109, PITTSBURGH, PA 15251-2109
PO BOX 223110, PITTSBURGH, PA 15251-2110
PO BOX 223111, PITTSBURGH, PA 15251-2111
PO BOX 223112, PITTSBURGH, PA 15251-2112
PO BOX 223113, PITTSBURGH, PA 15251-2113
PO BOX 223114, PITTSBURGH, PA 15251-2114
PO BOX 223115, PITTSBURGH, PA 15251-2115
PO BOX 223116, PITTSBURGH, PA 15251-2116
PO BOX 223117, PITTSBURGH, PA 15251-2117
PO BOX 223118, PITTSBURGH, PA 15251-2118
PO BOX 223119, PITTSBURGH, PA 15251-2119
PO BOX 223120, PITTSBURGH, PA 15251-2120
PO BOX 223121, PITTSBURGH, PA 15251-2121
PO BOX 223122, PITTSBURGH, PA 15251-2122
PO BOX 223123, PITTSBURGH, PA 15251-2123
PO BOX 223124, PITTSBURGH, PA 15251-2124
PO BOX 223125, PITTSBURGH, PA 15251-2125
PO BOX 223126, PITTSBURGH, PA 15251-2126
PO BOX 223127, PITTSBURGH, PA 15251-2127
PO BOX 223128, PITTSBURGH, PA 15251-2128
PO BOX 223129, PITTSBURGH, PA 15251-2129
PO BOX 223130, PITTSBURGH, PA 15251-2130
PO BOX 223131, PITTSBURGH, PA 15251-2131
PO BOX 223132, PITTSBURGH, PA 15251-2132
PO BOX 223133, PITTSBURGH, PA 15251-2133
PO BOX 223134, PITTSBURGH, PA 15251-2134
PO BOX 223135, PITTSBURGH, PA 15251-2135
PO BOX 223136, PITTSBURGH, PA 15251-2136
PO BOX 223137, PITTSBURGH, PA 15251-2137
PO BOX 223138, PITTSBURGH, PA 15251-2138
PO BOX 223139, PITTSBURGH, PA 15251-2139
PO BOX 223140, PITTSBURGH, PA 15251-2140
PO BOX 223141, PITTSBURGH, PA 15251-2141
PO BOX 223142, PITTSBURGH, PA 15251-2142
PO BOX 223143, PITTSBURGH, PA 15251-2143
PO BOX 223144, PITTSBURGH, PA 15251-2144
PO BOX 223145, PITTSBURGH, PA 15251-2145
PO BOX 223146, PITTSBURGH, PA 15251-2146
PO BOX 223147, PITTSBURGH, PA 15251-2147
PO BOX 223148, PITTSBURGH, PA 15251-2148
PO BOX 223149, PITTSBURGH, PA 15251-2149
PO BOX 223150, PITTSBURGH, PA 15251-2150
PO BOX 223151, PITTSBURGH, PA 15251-2151
PO BOX 223152, PITTSBURGH, PA 15251-2152
PO BOX 223153, PITTSBURGH, PA 15251-2153
PO BOX 223154, PITTSBURGH, PA 15251-2154
PO BOX 223155, PITTSBURGH, PA 15251-2155
PO BOX 223156, PITTSBURGH, PA 15251-2156
PO BOX 223157, PITTSBURGH, PA 15251-2157
PO BOX 223158, PITTSBURGH, PA 15251-2158
PO BOX 223159, PITTSBURGH, PA 15251-2159
PO BOX 223160, PITTSBURGH, PA 15251-2160
PO BOX 223161, PITTSBURGH, PA 15251-2161
PO BOX 223162, PITTSBURGH, PA 15251-2162
PO BOX 223163, PITTSBURGH, PA 15251-2163
PO BOX 223164, PITTSBURGH, PA 15251-2164
PO BOX 223165, PITTSBURGH, PA 15251-2165
PO BOX 223166, PITTSBURGH, PA 15251-2166
PO BOX 223167, PITTSBURGH, PA 15251-2167
PO BOX 223168, PITTSBURGH, PA 15251-2168
PO BOX 223169, PITTSBURGH, PA 15251-2169
PO BOX 223170, PITTSBURGH, PA 15251-2170
PO BOX 223171, PITTSBURGH, PA 15251-2171
PO BOX 223172, PITTSBURGH, PA 15251-2172
PO BOX 223173, PITTSBURGH, PA 15251-2173
PO BOX 223174, PITTSBURGH, PA 15251-2174
PO BOX 223175, PITTSBURGH, PA 15251-2175
PO BOX 223176, PITTSBURGH, PA 15251-2176
PO BOX 223177, PITTSBURGH, PA 15251-2177
PO BOX 223178, PITTSBURGH, PA 15251-2178
PO BOX 223179, PITTSBURGH, PA 15251-2179
PO BOX 223180, PITTSBURGH, PA 15251-2180
PO BOX 223181, PITTSBURGH, PA 15251-2181
PO BOX 223182, PITTSBURGH, PA 15251-2182
PO BOX 223183, PITTSBURGH, PA 15251-2183
PO BOX 223184, PITTSBURGH, PA 15251-2184
PO BOX 223185, PITTSBURGH, PA 15251-2185
PO BOX 223186, PITTSBURGH, PA 15251-2186
PO BOX 223187, PITTSBURGH, PA 15251-2187
PO BOX 223188, PITTSBURGH, PA 15251-2188
PO BOX 223189, PITTSBURGH, PA 15251-2189
PO BOX 223190, PITTSBURGH, PA 15251-2190
PO BOX 223191, PITTSBURGH, PA 15251-2191
PO BOX 223192, PITTSBURGH, PA 15251-2192
PO BOX 223193, PITTSBURGH, PA 15251-2193
PO BOX 223194, PITTSBURGH, PA 15251-2194
PO BOX 223195, PITTSBURGH, PA 15251-2195
PO BOX 223196, PITTSBURGH, PA 15251-2196
PO BOX 223197, PITTSBURGH, PA 15251-2197
PO BOX 223198, PITTSBURGH, PA 15251-2198
PO BOX 223199, PITTSBURGH, PA 15251-2199
PO BOX 223200, PITTSBURGH, PA 15251-2200
PO BOX 223201, PITTSBURGH, PA 15251-2201
PO BOX 223202, PITTSBURGH, PA 15251-2202
PO BOX 223203, PITTSBURGH, PA 15251-2203
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