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 640010, PITTSBURGH, PA 15264-0010
PO BOX 640011, PITTSBURGH, PA 15264-0011
PO BOX 640012, PITTSBURGH, PA 15264-0012
PO BOX 640013, PITTSBURGH, PA 15264-0013
PO BOX 640014, PITTSBURGH, PA 15264-0014
PO BOX 640015, PITTSBURGH, PA 15264-0015
PO BOX 640016, PITTSBURGH, PA 15264-0016
PO BOX 640017, PITTSBURGH, PA 15264-0017
PO BOX 640018, PITTSBURGH, PA 15264-0018
PO BOX 640019, PITTSBURGH, PA 15264-0019
PO BOX 640020, PITTSBURGH, PA 15264-0020
PO BOX 640021, PITTSBURGH, PA 15264-0021
PO BOX 640022, PITTSBURGH, PA 15264-0022
PO BOX 640023, PITTSBURGH, PA 15264-0023
PO BOX 640024, PITTSBURGH, PA 15264-0024
PO BOX 640025, PITTSBURGH, PA 15264-0025
PO BOX 640026, PITTSBURGH, PA 15264-0026
PO BOX 640027, PITTSBURGH, PA 15264-0027
PO BOX 640028, PITTSBURGH, PA 15264-0028
PO BOX 640029, PITTSBURGH, PA 15264-0029
PO BOX 640030, PITTSBURGH, PA 15264-0030
PO BOX 640031, PITTSBURGH, PA 15264-0031
PO BOX 640032, PITTSBURGH, PA 15264-0032
PO BOX 640033, PITTSBURGH, PA 15264-0033
PO BOX 640034, PITTSBURGH, PA 15264-0034
PO BOX 640035, PITTSBURGH, PA 15264-0035
PO BOX 640036, PITTSBURGH, PA 15264-0036
PO BOX 640037, PITTSBURGH, PA 15264-0037
PO BOX 640038, PITTSBURGH, PA 15264-0038
PO BOX 640039, PITTSBURGH, PA 15264-0039
PO BOX 640040, PITTSBURGH, PA 15264-0040
PO BOX 640041, PITTSBURGH, PA 15264-0041
PO BOX 640042, PITTSBURGH, PA 15264-0042
PO BOX 640043, PITTSBURGH, PA 15264-0043
PO BOX 640044, PITTSBURGH, PA 15264-0044
PO BOX 640045, PITTSBURGH, PA 15264-0045
PO BOX 640046, PITTSBURGH, PA 15264-0046
PO BOX 640047, PITTSBURGH, PA 15264-0047
PO BOX 640048, PITTSBURGH, PA 15264-0048
PO BOX 640049, PITTSBURGH, PA 15264-0049
PO BOX 640050, PITTSBURGH, PA 15264-0050
PO BOX 640051, PITTSBURGH, PA 15264-0051
PO BOX 640052, PITTSBURGH, PA 15264-0052
PO BOX 640053, PITTSBURGH, PA 15264-0053
PO BOX 640054, PITTSBURGH, PA 15264-0054
PO BOX 640055, PITTSBURGH, PA 15264-0055
PO BOX 640056, PITTSBURGH, PA 15264-0056
PO BOX 640057, PITTSBURGH, PA 15264-0057
PO BOX 640058, PITTSBURGH, PA 15264-0058
PO BOX 640059, PITTSBURGH, PA 15264-0059
PO BOX 640060, PITTSBURGH, PA 15264-0060
PO BOX 640061, PITTSBURGH, PA 15264-0061
PO BOX 640062, PITTSBURGH, PA 15264-0062
PO BOX 640063, PITTSBURGH, PA 15264-0063
PO BOX 640064, PITTSBURGH, PA 15264-0064
PO BOX 640065, PITTSBURGH, PA 15264-0065
PO BOX 640066, PITTSBURGH, PA 15264-0066
PO BOX 640067, PITTSBURGH, PA 15264-0067
PO BOX 640068, PITTSBURGH, PA 15264-0068
PO BOX 640069, PITTSBURGH, PA 15264-0069
PO BOX 640070, PITTSBURGH, PA 15264-0070
PO BOX 640071, PITTSBURGH, PA 15264-0071
PO BOX 640072, PITTSBURGH, PA 15264-0072
PO BOX 640073, PITTSBURGH, PA 15264-0073
PO BOX 640074, PITTSBURGH, PA 15264-0074
PO BOX 640075, PITTSBURGH, PA 15264-0075
PO BOX 640076, PITTSBURGH, PA 15264-0076
PO BOX 640077, PITTSBURGH, PA 15264-0077
PO BOX 640078, PITTSBURGH, PA 15264-0078
PO BOX 640079, PITTSBURGH, PA 15264-0079
PO BOX 640080, PITTSBURGH, PA 15264-0080
PO BOX 640081, PITTSBURGH, PA 15264-0081
PO BOX 640082, PITTSBURGH, PA 15264-0082
PO BOX 640083, PITTSBURGH, PA 15264-0083
PO BOX 640084, PITTSBURGH, PA 15264-0084
PO BOX 640085, PITTSBURGH, PA 15264-0085
PO BOX 640086, PITTSBURGH, PA 15264-0086
PO BOX 640087, PITTSBURGH, PA 15264-0087
PO BOX 640088, PITTSBURGH, PA 15264-0088
PO BOX 640089, PITTSBURGH, PA 15264-0089
PO BOX 640090, PITTSBURGH, PA 15264-0090
PO BOX 640091, PITTSBURGH, PA 15264-0091
PO BOX 640092, PITTSBURGH, PA 15264-0092
PO BOX 640093, PITTSBURGH, PA 15264-0093
PO BOX 640094, PITTSBURGH, PA 15264-0094
PO BOX 640095, PITTSBURGH, PA 15264-0095
PO BOX 640096, PITTSBURGH, PA 15264-0096
PO BOX 640097, PITTSBURGH, PA 15264-0097
PO BOX 640098, PITTSBURGH, PA 15264-0098
PO BOX 640099, PITTSBURGH, PA 15264-0099
PO BOX 640100, PITTSBURGH, PA 15264-0100
PO BOX 640101, PITTSBURGH, PA 15264-0101
PO BOX 640102, PITTSBURGH, PA 15264-0102
PO BOX 640103, PITTSBURGH, PA 15264-0103
PO BOX 640104, PITTSBURGH, PA 15264-0104
PO BOX 640105, PITTSBURGH, PA 15264-0105
PO BOX 640106, PITTSBURGH, PA 15264-0106
PO BOX 640107, PITTSBURGH, PA 15264-0107
PO BOX 640108, PITTSBURGH, PA 15264-0108
PO BOX 640109, PITTSBURGH, PA 15264-0109
PO BOX 640110, PITTSBURGH, PA 15264-0110
PO BOX 640111, PITTSBURGH, PA 15264-0111
PO BOX 640112, PITTSBURGH, PA 15264-0112
PO BOX 640113, PITTSBURGH, PA 15264-0113
PO BOX 640114, PITTSBURGH, PA 15264-0114
PO BOX 640115, PITTSBURGH, PA 15264-0115
PO BOX 640116, PITTSBURGH, PA 15264-0116
PO BOX 640117, PITTSBURGH, PA 15264-0117
PO BOX 640118, PITTSBURGH, PA 15264-0118
PO BOX 640119, PITTSBURGH, PA 15264-0119
PO BOX 640120, PITTSBURGH, PA 15264-0120
PO BOX 640121, PITTSBURGH, PA 15264-0121
PO BOX 640122, PITTSBURGH, PA 15264-0122
PO BOX 640123, PITTSBURGH, PA 15264-0123
PO BOX 640124, PITTSBURGH, PA 15264-0124
PO BOX 640125, PITTSBURGH, PA 15264-0125
PO BOX 640126, PITTSBURGH, PA 15264-0126
PO BOX 640127, PITTSBURGH, PA 15264-0127
PO BOX 640128, PITTSBURGH, PA 15264-0128
PO BOX 640129, PITTSBURGH, PA 15264-0129
PO BOX 640130, PITTSBURGH, PA 15264-0130
PO BOX 640131, PITTSBURGH, PA 15264-0131
PO BOX 640132, PITTSBURGH, PA 15264-0132
PO BOX 640133, PITTSBURGH, PA 15264-0133
PO BOX 640134, PITTSBURGH, PA 15264-0134
PO BOX 640135, PITTSBURGH, PA 15264-0135
PO BOX 640136, PITTSBURGH, PA 15264-0136
PO BOX 640137, PITTSBURGH, PA 15264-0137
PO BOX 640138, PITTSBURGH, PA 15264-0138
PO BOX 640139, PITTSBURGH, PA 15264-0139
PO BOX 640140, PITTSBURGH, PA 15264-0140
PO BOX 640141, PITTSBURGH, PA 15264-0141
PO BOX 640142, PITTSBURGH, PA 15264-0142
PO BOX 640143, PITTSBURGH, PA 15264-0143
PO BOX 640144, PITTSBURGH, PA 15264-0144
PO BOX 640145, PITTSBURGH, PA 15264-0145
PO BOX 640146, PITTSBURGH, PA 15264-0146
PO BOX 640147, PITTSBURGH, PA 15264-0147
PO BOX 640148, PITTSBURGH, PA 15264-0148
PO BOX 640149, PITTSBURGH, PA 15264-0149
PO BOX 640150, PITTSBURGH, PA 15264-0150
PO BOX 640151, PITTSBURGH, PA 15264-0151
PO BOX 640152, PITTSBURGH, PA 15264-0152
PO BOX 640153, PITTSBURGH, PA 15264-0153
PO BOX 640154, PITTSBURGH, PA 15264-0154
PO BOX 640155, PITTSBURGH, PA 15264-0155
PO BOX 640156, PITTSBURGH, PA 15264-0156
PO BOX 640157, PITTSBURGH, PA 15264-0157
PO BOX 640158, PITTSBURGH, PA 15264-0158
PO BOX 640159, PITTSBURGH, PA 15264-0159
PO BOX 640160, PITTSBURGH, PA 15264-0160
PO BOX 640161, PITTSBURGH, PA 15264-0161
PO BOX 640162, PITTSBURGH, PA 15264-0162
PO BOX 640163, PITTSBURGH, PA 15264-0163
PO BOX 640164, PITTSBURGH, PA 15264-0164
PO BOX 640165, PITTSBURGH, PA 15264-0165
PO BOX 640166, PITTSBURGH, PA 15264-0166
PO BOX 640167, PITTSBURGH, PA 15264-0167
PO BOX 640168, PITTSBURGH, PA 15264-0168
PO BOX 640169, PITTSBURGH, PA 15264-0169
PO BOX 640170, PITTSBURGH, PA 15264-0170
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