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 535000, PITTSBURGH, PA 15253-5000
PO BOX 535001, PITTSBURGH, PA 15253-5001
PO BOX 535002, PITTSBURGH, PA 15253-5002
PO BOX 535003, PITTSBURGH, PA 15253-5003
PO BOX 535004, PITTSBURGH, PA 15253-5004
PO BOX 535005, PITTSBURGH, PA 15253-5005
PO BOX 535006, PITTSBURGH, PA 15253-5006
PO BOX 535007, PITTSBURGH, PA 15253-5007
PO BOX 535008, PITTSBURGH, PA 15253-5008
PO BOX 535009, PITTSBURGH, PA 15253-5009
PO BOX 535010, PITTSBURGH, PA 15253-5010
PO BOX 535011, PITTSBURGH, PA 15253-5011
PO BOX 535012, PITTSBURGH, PA 15253-5012
PO BOX 535013, PITTSBURGH, PA 15253-5013
PO BOX 535014, PITTSBURGH, PA 15253-5014
PO BOX 535015, PITTSBURGH, PA 15253-5015
PO BOX 535016, PITTSBURGH, PA 15253-5016
PO BOX 535017, PITTSBURGH, PA 15253-5017
PO BOX 535018, PITTSBURGH, PA 15253-5018
PO BOX 535019, PITTSBURGH, PA 15253-5019
PO BOX 535020, PITTSBURGH, PA 15253-5020
PO BOX 535021, PITTSBURGH, PA 15253-5021
PO BOX 535022, PITTSBURGH, PA 15253-5022
PO BOX 535023, PITTSBURGH, PA 15253-5023
PO BOX 535024, PITTSBURGH, PA 15253-5024
PO BOX 535025, PITTSBURGH, PA 15253-5025
PO BOX 535026, PITTSBURGH, PA 15253-5026
PO BOX 535027, PITTSBURGH, PA 15253-5027
PO BOX 535028, PITTSBURGH, PA 15253-5028
PO BOX 535029, PITTSBURGH, PA 15253-5029
PO BOX 535030, PITTSBURGH, PA 15253-5030
PO BOX 535031, PITTSBURGH, PA 15253-5031
PO BOX 535032, PITTSBURGH, PA 15253-5032
PO BOX 535033, PITTSBURGH, PA 15253-5033
PO BOX 535034, PITTSBURGH, PA 15253-5034
PO BOX 535035, PITTSBURGH, PA 15253-5035
PO BOX 535036, PITTSBURGH, PA 15253-5036
PO BOX 535037, PITTSBURGH, PA 15253-5037
PO BOX 535038, PITTSBURGH, PA 15253-5038
PO BOX 535039, PITTSBURGH, PA 15253-5039
PO BOX 535040, PITTSBURGH, PA 15253-5040
PO BOX 535041, PITTSBURGH, PA 15253-5041
PO BOX 535042, PITTSBURGH, PA 15253-5042
PO BOX 535043, PITTSBURGH, PA 15253-5043
PO BOX 535044, PITTSBURGH, PA 15253-5044
PO BOX 535045, PITTSBURGH, PA 15253-5045
PO BOX 535046, PITTSBURGH, PA 15253-5046
PO BOX 535047, PITTSBURGH, PA 15253-5047
PO BOX 535048, PITTSBURGH, PA 15253-5048
PO BOX 535049, PITTSBURGH, PA 15253-5049
PO BOX 535050, PITTSBURGH, PA 15253-5050
PO BOX 535051, PITTSBURGH, PA 15253-5051
PO BOX 535052, PITTSBURGH, PA 15253-5052
PO BOX 535053, PITTSBURGH, PA 15253-5053
PO BOX 535054, PITTSBURGH, PA 15253-5054
PO BOX 535055, PITTSBURGH, PA 15253-5055
PO BOX 535056, PITTSBURGH, PA 15253-5056
PO BOX 535057, PITTSBURGH, PA 15253-5057
PO BOX 535058, PITTSBURGH, PA 15253-5058
PO BOX 535059, PITTSBURGH, PA 15253-5059
PO BOX 535060, PITTSBURGH, PA 15253-5060
PO BOX 535061, PITTSBURGH, PA 15253-5061
PO BOX 535062, PITTSBURGH, PA 15253-5062
PO BOX 535063, PITTSBURGH, PA 15253-5063
PO BOX 535064, PITTSBURGH, PA 15253-5064
PO BOX 535065, PITTSBURGH, PA 15253-5065
PO BOX 535066, PITTSBURGH, PA 15253-5066
PO BOX 535067, PITTSBURGH, PA 15253-5067
PO BOX 535068, PITTSBURGH, PA 15253-5068
PO BOX 535069, PITTSBURGH, PA 15253-5069
PO BOX 535070, PITTSBURGH, PA 15253-5070
PO BOX 535071, PITTSBURGH, PA 15253-5071
PO BOX 535072, PITTSBURGH, PA 15253-5072
PO BOX 535073, PITTSBURGH, PA 15253-5073
PO BOX 535074, PITTSBURGH, PA 15253-5074
PO BOX 535075, PITTSBURGH, PA 15253-5075
PO BOX 535076, PITTSBURGH, PA 15253-5076
PO BOX 535077, PITTSBURGH, PA 15253-5077
PO BOX 535078, PITTSBURGH, PA 15253-5078
PO BOX 535079, PITTSBURGH, PA 15253-5079
PO BOX 535080, PITTSBURGH, PA 15253-5080
PO BOX 535081, PITTSBURGH, PA 15253-5081
PO BOX 535082, PITTSBURGH, PA 15253-5082
PO BOX 535083, PITTSBURGH, PA 15253-5083
PO BOX 535084, PITTSBURGH, PA 15253-5084
PO BOX 535085, PITTSBURGH, PA 15253-5085
PO BOX 535086, PITTSBURGH, PA 15253-5086
PO BOX 535087, PITTSBURGH, PA 15253-5087
PO BOX 535088, PITTSBURGH, PA 15253-5088
PO BOX 535089, PITTSBURGH, PA 15253-5089
PO BOX 535090, PITTSBURGH, PA 15253-5090
PO BOX 535091, PITTSBURGH, PA 15253-5091
PO BOX 535092, PITTSBURGH, PA 15253-5092
PO BOX 535093, PITTSBURGH, PA 15253-5093
PO BOX 535094, PITTSBURGH, PA 15253-5094
PO BOX 535095, PITTSBURGH, PA 15253-5095
PO BOX 535096, PITTSBURGH, PA 15253-5096
PO BOX 535097, PITTSBURGH, PA 15253-5097
PO BOX 535098, PITTSBURGH, PA 15253-5098
PO BOX 535099, PITTSBURGH, PA 15253-5099
PO BOX 535100, PITTSBURGH, PA 15253-5100
PO BOX 535101, PITTSBURGH, PA 15253-5101
PO BOX 535102, PITTSBURGH, PA 15253-5102
PO BOX 535103, PITTSBURGH, PA 15253-5103
PO BOX 535104, PITTSBURGH, PA 15253-5104
PO BOX 535105, PITTSBURGH, PA 15253-5105
PO BOX 535106, PITTSBURGH, PA 15253-5106
PO BOX 535107, PITTSBURGH, PA 15253-5107
PO BOX 535108, PITTSBURGH, PA 15253-5108
PO BOX 535109, PITTSBURGH, PA 15253-5109
PO BOX 535110, PITTSBURGH, PA 15253-5110
PO BOX 535111, PITTSBURGH, PA 15253-5111
PO BOX 535112, PITTSBURGH, PA 15253-5112
PO BOX 535113, PITTSBURGH, PA 15253-5113
PO BOX 535114, PITTSBURGH, PA 15253-5114
PO BOX 535115, PITTSBURGH, PA 15253-5115
PO BOX 535116, PITTSBURGH, PA 15253-5116
PO BOX 535117, PITTSBURGH, PA 15253-5117
PO BOX 535118, PITTSBURGH, PA 15253-5118
PO BOX 535119, PITTSBURGH, PA 15253-5119
PO BOX 535120, PITTSBURGH, PA 15253-5120
PO BOX 535121, PITTSBURGH, PA 15253-5121
PO BOX 535122, PITTSBURGH, PA 15253-5122
PO BOX 535123, PITTSBURGH, PA 15253-5123
PO BOX 535124, PITTSBURGH, PA 15253-5124
PO BOX 535125, PITTSBURGH, PA 15253-5125
PO BOX 535126, PITTSBURGH, PA 15253-5126
PO BOX 535127, PITTSBURGH, PA 15253-5127
PO BOX 535128, PITTSBURGH, PA 15253-5128
PO BOX 535129, PITTSBURGH, PA 15253-5129
PO BOX 535130, PITTSBURGH, PA 15253-5130
PO BOX 535131, PITTSBURGH, PA 15253-5131
PO BOX 535132, PITTSBURGH, PA 15253-5132
PO BOX 535133, PITTSBURGH, PA 15253-5133
PO BOX 535134, PITTSBURGH, PA 15253-5134
PO BOX 535135, PITTSBURGH, PA 15253-5135
PO BOX 535136, PITTSBURGH, PA 15253-5136
PO BOX 535137, PITTSBURGH, PA 15253-5137
PO BOX 535138, PITTSBURGH, PA 15253-5138
PO BOX 535139, PITTSBURGH, PA 15253-5139
PO BOX 535140, PITTSBURGH, PA 15253-5140
PO BOX 535141, PITTSBURGH, PA 15253-5141
PO BOX 535142, PITTSBURGH, PA 15253-5142
PO BOX 535143, PITTSBURGH, PA 15253-5143
PO BOX 535144, PITTSBURGH, PA 15253-5144
PO BOX 535145, PITTSBURGH, PA 15253-5145
PO BOX 535146, PITTSBURGH, PA 15253-5146
PO BOX 535147, PITTSBURGH, PA 15253-5147
PO BOX 535148, PITTSBURGH, PA 15253-5148
PO BOX 535149, PITTSBURGH, PA 15253-5149
PO BOX 535150, PITTSBURGH, PA 15253-5150
PO BOX 535151, PITTSBURGH, PA 15253-5151
PO BOX 535152, PITTSBURGH, PA 15253-5152
PO BOX 535153, PITTSBURGH, PA 15253-5153
PO BOX 535154, PITTSBURGH, PA 15253-5154
PO BOX 535155, PITTSBURGH, PA 15253-5155
PO BOX 535156, PITTSBURGH, PA 15253-5156
PO BOX 535157, PITTSBURGH, PA 15253-5157
PO BOX 535158, PITTSBURGH, PA 15253-5158
PO BOX 535159, PITTSBURGH, PA 15253-5159
PO BOX 535160, PITTSBURGH, PA 15253-5160
PO BOX 535161, PITTSBURGH, PA 15253-5161
PO BOX 535162, PITTSBURGH, PA 15253-5162
PO BOX 535163, PITTSBURGH, PA 15253-5163
PO BOX 535164, PITTSBURGH, PA 15253-5164
PO BOX 535165, PITTSBURGH, PA 15253-5165
PO BOX 535166, PITTSBURGH, PA 15253-5166
PO BOX 535167, PITTSBURGH, PA 15253-5167
PO BOX 535168, PITTSBURGH, PA 15253-5168
PO BOX 535169, PITTSBURGH, PA 15253-5169
PO BOX 535170, PITTSBURGH, PA 15253-5170
PO BOX 535171, PITTSBURGH, PA 15253-5171
PO BOX 535172, PITTSBURGH, PA 15253-5172
PO BOX 535173, PITTSBURGH, PA 15253-5173
PO BOX 535174, PITTSBURGH, PA 15253-5174
PO BOX 535175, PITTSBURGH, PA 15253-5175
PO BOX 535176, PITTSBURGH, PA 15253-5176
PO BOX 535177, PITTSBURGH, PA 15253-5177
PO BOX 535178, PITTSBURGH, PA 15253-5178
PO BOX 535179, PITTSBURGH, PA 15253-5179
PO BOX 535180, PITTSBURGH, PA 15253-5180
PO BOX 535181, PITTSBURGH, PA 15253-5181
PO BOX 535182, PITTSBURGH, PA 15253-5182
PO BOX 535183, PITTSBURGH, PA 15253-5183
PO BOX 535184, PITTSBURGH, PA 15253-5184
PO BOX 535185, PITTSBURGH, PA 15253-5185
PO BOX 535186, PITTSBURGH, PA 15253-5186
PO BOX 535187, PITTSBURGH, PA 15253-5187
PO BOX 535188, PITTSBURGH, PA 15253-5188
PO BOX 535189, PITTSBURGH, PA 15253-5189
PO BOX 535190, PITTSBURGH, PA 15253-5190
PO BOX 535191, PITTSBURGH, PA 15253-5191
PO BOX 535192, PITTSBURGH, PA 15253-5192
PO BOX 535193, PITTSBURGH, PA 15253-5193
PO BOX 535194, PITTSBURGH, PA 15253-5194
PO BOX 535195, PITTSBURGH, PA 15253-5195
PO BOX 535196, PITTSBURGH, PA 15253-5196
PO BOX 535197, PITTSBURGH, PA 15253-5197
PO BOX 535198, PITTSBURGH, PA 15253-5198
PO BOX 535199, PITTSBURGH, PA 15253-5199
PO BOX 535200, PITTSBURGH, PA 15253-5200
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