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 5001, CAPITOL HEIGHTS, MD 20791-5001
PO BOX 5002, CAPITOL HEIGHTS, MD 20791-5002
PO BOX 5003, CAPITOL HEIGHTS, MD 20791-5003
PO BOX 5004, CAPITOL HEIGHTS, MD 20791-5004
PO BOX 5005, CAPITOL HEIGHTS, MD 20791-5005
PO BOX 5006, CAPITOL HEIGHTS, MD 20791-5006
PO BOX 5007, CAPITOL HEIGHTS, MD 20791-5007
PO BOX 5008, CAPITOL HEIGHTS, MD 20791-5008
PO BOX 5009, CAPITOL HEIGHTS, MD 20791-5009
PO BOX 5010, CAPITOL HEIGHTS, MD 20791-5010
PO BOX 5011, CAPITOL HEIGHTS, MD 20791-5011
PO BOX 5012, CAPITOL HEIGHTS, MD 20791-5012
PO BOX 5013, CAPITOL HEIGHTS, MD 20791-5013
PO BOX 5014, CAPITOL HEIGHTS, MD 20791-5014
PO BOX 5015, CAPITOL HEIGHTS, MD 20791-5015
PO BOX 5016, CAPITOL HEIGHTS, MD 20791-5016
PO BOX 5017, CAPITOL HEIGHTS, MD 20791-5017
PO BOX 5018, CAPITOL HEIGHTS, MD 20791-5018
PO BOX 5019, CAPITOL HEIGHTS, MD 20791-5019
PO BOX 5020, CAPITOL HEIGHTS, MD 20791-5020
PO BOX 5021, CAPITOL HEIGHTS, MD 20791-5021
PO BOX 5022, CAPITOL HEIGHTS, MD 20791-5022
PO BOX 5023, CAPITOL HEIGHTS, MD 20791-5023
PO BOX 5024, CAPITOL HEIGHTS, MD 20791-5024
PO BOX 5025, CAPITOL HEIGHTS, MD 20791-5025
PO BOX 5026, CAPITOL HEIGHTS, MD 20791-5026
PO BOX 5027, CAPITOL HEIGHTS, MD 20791-5027
PO BOX 5028, CAPITOL HEIGHTS, MD 20791-5028
PO BOX 5029, CAPITOL HEIGHTS, MD 20791-5029
PO BOX 5030, CAPITOL HEIGHTS, MD 20791-5030
PO BOX 5031, CAPITOL HEIGHTS, MD 20791-5031
PO BOX 5032, CAPITOL HEIGHTS, MD 20791-5032
PO BOX 5033, CAPITOL HEIGHTS, MD 20791-5033
PO BOX 5034, CAPITOL HEIGHTS, MD 20791-5034
PO BOX 5035, CAPITOL HEIGHTS, MD 20791-5035
PO BOX 5036, CAPITOL HEIGHTS, MD 20791-5036
PO BOX 5037, CAPITOL HEIGHTS, MD 20791-5037
PO BOX 5038, CAPITOL HEIGHTS, MD 20791-5038
PO BOX 5039, CAPITOL HEIGHTS, MD 20791-5039
PO BOX 5040, CAPITOL HEIGHTS, MD 20791-5040
PO BOX 5041, CAPITOL HEIGHTS, MD 20791-5041
PO BOX 5042, CAPITOL HEIGHTS, MD 20791-5042
PO BOX 5043, CAPITOL HEIGHTS, MD 20791-5043
PO BOX 5044, CAPITOL HEIGHTS, MD 20791-5044
PO BOX 5045, CAPITOL HEIGHTS, MD 20791-5045
PO BOX 5046, CAPITOL HEIGHTS, MD 20791-5046
PO BOX 5047, CAPITOL HEIGHTS, MD 20791-5047
PO BOX 5048, CAPITOL HEIGHTS, MD 20791-5048
PO BOX 5049, CAPITOL HEIGHTS, MD 20791-5049
PO BOX 5050, CAPITOL HEIGHTS, MD 20791-5050
PO BOX 5051, CAPITOL HEIGHTS, MD 20791-5051
PO BOX 5052, CAPITOL HEIGHTS, MD 20791-5052
PO BOX 5053, CAPITOL HEIGHTS, MD 20791-5053
PO BOX 5054, CAPITOL HEIGHTS, MD 20791-5054
PO BOX 5055, CAPITOL HEIGHTS, MD 20791-5055
PO BOX 5056, CAPITOL HEIGHTS, MD 20791-5056
PO BOX 5057, CAPITOL HEIGHTS, MD 20791-5057
PO BOX 5058, CAPITOL HEIGHTS, MD 20791-5058
PO BOX 5059, CAPITOL HEIGHTS, MD 20791-5059
PO BOX 5060, CAPITOL HEIGHTS, MD 20791-5060
PO BOX 5061, CAPITOL HEIGHTS, MD 20791-5061
PO BOX 5062, CAPITOL HEIGHTS, MD 20791-5062
PO BOX 5063, CAPITOL HEIGHTS, MD 20791-5063
PO BOX 5064, CAPITOL HEIGHTS, MD 20791-5064
PO BOX 5065, CAPITOL HEIGHTS, MD 20791-5065
PO BOX 5066, CAPITOL HEIGHTS, MD 20791-5066
PO BOX 5067, CAPITOL HEIGHTS, MD 20791-5067
PO BOX 5068, CAPITOL HEIGHTS, MD 20791-5068
PO BOX 5069, CAPITOL HEIGHTS, MD 20791-5069
PO BOX 5070, CAPITOL HEIGHTS, MD 20791-5070
PO BOX 5071, CAPITOL HEIGHTS, MD 20791-5071
PO BOX 5072, CAPITOL HEIGHTS, MD 20791-5072
PO BOX 5073, CAPITOL HEIGHTS, MD 20791-5073
PO BOX 5074, CAPITOL HEIGHTS, MD 20791-5074
PO BOX 5075, CAPITOL HEIGHTS, MD 20791-5075
PO BOX 5076, CAPITOL HEIGHTS, MD 20791-5076
PO BOX 5077, CAPITOL HEIGHTS, MD 20791-5077
PO BOX 5078, CAPITOL HEIGHTS, MD 20791-5078
PO BOX 5079, CAPITOL HEIGHTS, MD 20791-5079
PO BOX 5080, CAPITOL HEIGHTS, MD 20791-5080
PO BOX 5081, CAPITOL HEIGHTS, MD 20791-5081
PO BOX 5082, CAPITOL HEIGHTS, MD 20791-5082
PO BOX 5083, CAPITOL HEIGHTS, MD 20791-5083
PO BOX 5084, CAPITOL HEIGHTS, MD 20791-5084
PO BOX 5085, CAPITOL HEIGHTS, MD 20791-5085
PO BOX 5086, CAPITOL HEIGHTS, MD 20791-5086
PO BOX 5087, CAPITOL HEIGHTS, MD 20791-5087
PO BOX 5088, CAPITOL HEIGHTS, MD 20791-5088
PO BOX 5089, CAPITOL HEIGHTS, MD 20791-5089
PO BOX 5090, CAPITOL HEIGHTS, MD 20791-5090
PO BOX 5091, CAPITOL HEIGHTS, MD 20791-5091
PO BOX 5092, CAPITOL HEIGHTS, MD 20791-5092
PO BOX 5093, CAPITOL HEIGHTS, MD 20791-5093
PO BOX 5094, CAPITOL HEIGHTS, MD 20791-5094
PO BOX 5095, CAPITOL HEIGHTS, MD 20791-5095
PO BOX 5096, CAPITOL HEIGHTS, MD 20791-5096
PO BOX 5097, CAPITOL HEIGHTS, MD 20791-5097
PO BOX 5098, CAPITOL HEIGHTS, MD 20791-5098
PO BOX 5099, CAPITOL HEIGHTS, MD 20791-5099
PO BOX 5100, CAPITOL HEIGHTS, MD 20791-5100
PO BOX 5101, CAPITOL HEIGHTS, MD 20791-5101
PO BOX 5102, CAPITOL HEIGHTS, MD 20791-5102
PO BOX 5103, CAPITOL HEIGHTS, MD 20791-5103
PO BOX 5104, CAPITOL HEIGHTS, MD 20791-5104
PO BOX 5105, CAPITOL HEIGHTS, MD 20791-5105
PO BOX 5106, CAPITOL HEIGHTS, MD 20791-5106
PO BOX 5107, CAPITOL HEIGHTS, MD 20791-5107
PO BOX 5108, CAPITOL HEIGHTS, MD 20791-5108
PO BOX 5109, CAPITOL HEIGHTS, MD 20791-5109
PO BOX 5110, CAPITOL HEIGHTS, MD 20791-5110
PO BOX 5111, CAPITOL HEIGHTS, MD 20791-5111
PO BOX 5112, CAPITOL HEIGHTS, MD 20791-5112
PO BOX 5113, CAPITOL HEIGHTS, MD 20791-5113
PO BOX 5114, CAPITOL HEIGHTS, MD 20791-5114
PO BOX 5115, CAPITOL HEIGHTS, MD 20791-5115
PO BOX 5116, CAPITOL HEIGHTS, MD 20791-5116
PO BOX 5117, CAPITOL HEIGHTS, MD 20791-5117
PO BOX 5118, CAPITOL HEIGHTS, MD 20791-5118
PO BOX 5119, CAPITOL HEIGHTS, MD 20791-5119
PO BOX 5120, CAPITOL HEIGHTS, MD 20791-5120
PO BOX 5121, CAPITOL HEIGHTS, MD 20791-5121
PO BOX 5122, CAPITOL HEIGHTS, MD 20791-5122
PO BOX 5123, CAPITOL HEIGHTS, MD 20791-5123
PO BOX 5124, CAPITOL HEIGHTS, MD 20791-5124
PO BOX 5125, CAPITOL HEIGHTS, MD 20791-5125
PO BOX 5126, CAPITOL HEIGHTS, MD 20791-5126
PO BOX 5127, CAPITOL HEIGHTS, MD 20791-5127
PO BOX 5128, CAPITOL HEIGHTS, MD 20791-5128
PO BOX 5129, CAPITOL HEIGHTS, MD 20791-5129
PO BOX 5130, CAPITOL HEIGHTS, MD 20791-5130
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