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 7001, CAPITOL HEIGHTS, MD 20791-7001
PO BOX 7002, CAPITOL HEIGHTS, MD 20791-7002
PO BOX 7003, CAPITOL HEIGHTS, MD 20791-7003
PO BOX 7004, CAPITOL HEIGHTS, MD 20791-7004
PO BOX 7005, CAPITOL HEIGHTS, MD 20791-7005
PO BOX 7006, CAPITOL HEIGHTS, MD 20791-7006
PO BOX 7007, CAPITOL HEIGHTS, MD 20791-7007
PO BOX 7008, CAPITOL HEIGHTS, MD 20791-7008
PO BOX 7009, CAPITOL HEIGHTS, MD 20791-7009
PO BOX 7010, CAPITOL HEIGHTS, MD 20791-7010
PO BOX 7011, CAPITOL HEIGHTS, MD 20791-7011
PO BOX 7012, CAPITOL HEIGHTS, MD 20791-7012
PO BOX 7013, CAPITOL HEIGHTS, MD 20791-7013
PO BOX 7014, CAPITOL HEIGHTS, MD 20791-7014
PO BOX 7015, CAPITOL HEIGHTS, MD 20791-7015
PO BOX 7016, CAPITOL HEIGHTS, MD 20791-7016
PO BOX 7017, CAPITOL HEIGHTS, MD 20791-7017
PO BOX 7018, CAPITOL HEIGHTS, MD 20791-7018
PO BOX 7019, CAPITOL HEIGHTS, MD 20791-7019
PO BOX 7020, CAPITOL HEIGHTS, MD 20791-7020
PO BOX 7021, CAPITOL HEIGHTS, MD 20791-7021
PO BOX 7022, CAPITOL HEIGHTS, MD 20791-7022
PO BOX 7023, CAPITOL HEIGHTS, MD 20791-7023
PO BOX 7024, CAPITOL HEIGHTS, MD 20791-7024
PO BOX 7025, CAPITOL HEIGHTS, MD 20791-7025
PO BOX 7026, CAPITOL HEIGHTS, MD 20791-7026
PO BOX 7027, CAPITOL HEIGHTS, MD 20791-7027
PO BOX 7028, CAPITOL HEIGHTS, MD 20791-7028
PO BOX 7029, CAPITOL HEIGHTS, MD 20791-7029
PO BOX 7030, CAPITOL HEIGHTS, MD 20791-7030
PO BOX 7031, CAPITOL HEIGHTS, MD 20791-7031
PO BOX 7032, CAPITOL HEIGHTS, MD 20791-7032
PO BOX 7033, CAPITOL HEIGHTS, MD 20791-7033
PO BOX 7034, CAPITOL HEIGHTS, MD 20791-7034
PO BOX 7035, CAPITOL HEIGHTS, MD 20791-7035
PO BOX 7036, CAPITOL HEIGHTS, MD 20791-7036
PO BOX 7037, CAPITOL HEIGHTS, MD 20791-7037
PO BOX 7038, CAPITOL HEIGHTS, MD 20791-7038
PO BOX 7039, CAPITOL HEIGHTS, MD 20791-7039
PO BOX 7040, CAPITOL HEIGHTS, MD 20791-7040
PO BOX 7041, CAPITOL HEIGHTS, MD 20791-7041
PO BOX 7042, CAPITOL HEIGHTS, MD 20791-7042
PO BOX 7043, CAPITOL HEIGHTS, MD 20791-7043
PO BOX 7044, CAPITOL HEIGHTS, MD 20791-7044
PO BOX 7045, CAPITOL HEIGHTS, MD 20791-7045
PO BOX 7046, CAPITOL HEIGHTS, MD 20791-7046
PO BOX 7047, CAPITOL HEIGHTS, MD 20791-7047
PO BOX 7048, CAPITOL HEIGHTS, MD 20791-7048
PO BOX 7049, CAPITOL HEIGHTS, MD 20791-7049
PO BOX 7050, CAPITOL HEIGHTS, MD 20791-7050
PO BOX 7051, CAPITOL HEIGHTS, MD 20791-7051
PO BOX 7052, CAPITOL HEIGHTS, MD 20791-7052
PO BOX 7053, CAPITOL HEIGHTS, MD 20791-7053
PO BOX 7054, CAPITOL HEIGHTS, MD 20791-7054
PO BOX 7055, CAPITOL HEIGHTS, MD 20791-7055
PO BOX 7056, CAPITOL HEIGHTS, MD 20791-7056
PO BOX 7057, CAPITOL HEIGHTS, MD 20791-7057
PO BOX 7058, CAPITOL HEIGHTS, MD 20791-7058
PO BOX 7059, CAPITOL HEIGHTS, MD 20791-7059
PO BOX 7060, CAPITOL HEIGHTS, MD 20791-7060
PO BOX 7061, CAPITOL HEIGHTS, MD 20791-7061
PO BOX 7062, CAPITOL HEIGHTS, MD 20791-7062
PO BOX 7063, CAPITOL HEIGHTS, MD 20791-7063
PO BOX 7064, CAPITOL HEIGHTS, MD 20791-7064
PO BOX 7065, CAPITOL HEIGHTS, MD 20791-7065
PO BOX 7066, CAPITOL HEIGHTS, MD 20791-7066
PO BOX 7067, CAPITOL HEIGHTS, MD 20791-7067
PO BOX 7068, CAPITOL HEIGHTS, MD 20791-7068
PO BOX 7069, CAPITOL HEIGHTS, MD 20791-7069
PO BOX 7070, CAPITOL HEIGHTS, MD 20791-7070
PO BOX 7071, CAPITOL HEIGHTS, MD 20791-7071
PO BOX 7072, CAPITOL HEIGHTS, MD 20791-7072
PO BOX 7073, CAPITOL HEIGHTS, MD 20791-7073
PO BOX 7074, CAPITOL HEIGHTS, MD 20791-7074
PO BOX 7075, CAPITOL HEIGHTS, MD 20791-7075
PO BOX 7076, CAPITOL HEIGHTS, MD 20791-7076
PO BOX 7077, CAPITOL HEIGHTS, MD 20791-7077
PO BOX 7078, CAPITOL HEIGHTS, MD 20791-7078
PO BOX 7079, CAPITOL HEIGHTS, MD 20791-7079
PO BOX 7080, CAPITOL HEIGHTS, MD 20791-7080
PO BOX 7081, CAPITOL HEIGHTS, MD 20791-7081
PO BOX 7082, CAPITOL HEIGHTS, MD 20791-7082
PO BOX 7083, CAPITOL HEIGHTS, MD 20791-7083
PO BOX 7084, CAPITOL HEIGHTS, MD 20791-7084
PO BOX 7085, CAPITOL HEIGHTS, MD 20791-7085
PO BOX 7086, CAPITOL HEIGHTS, MD 20791-7086
PO BOX 7087, CAPITOL HEIGHTS, MD 20791-7087
PO BOX 7088, CAPITOL HEIGHTS, MD 20791-7088
PO BOX 7089, CAPITOL HEIGHTS, MD 20791-7089
PO BOX 7090, CAPITOL HEIGHTS, MD 20791-7090
PO BOX 7091, CAPITOL HEIGHTS, MD 20791-7091
PO BOX 7092, CAPITOL HEIGHTS, MD 20791-7092
PO BOX 7093, CAPITOL HEIGHTS, MD 20791-7093
PO BOX 7094, CAPITOL HEIGHTS, MD 20791-7094
PO BOX 7095, CAPITOL HEIGHTS, MD 20791-7095
PO BOX 7096, CAPITOL HEIGHTS, MD 20791-7096
PO BOX 7097, CAPITOL HEIGHTS, MD 20791-7097
PO BOX 7098, CAPITOL HEIGHTS, MD 20791-7098
PO BOX 7099, CAPITOL HEIGHTS, MD 20791-7099
PO BOX 7100, CAPITOL HEIGHTS, MD 20791-7100
PO BOX 7101, CAPITOL HEIGHTS, MD 20791-7101
PO BOX 7102, CAPITOL HEIGHTS, MD 20791-7102
PO BOX 7103, CAPITOL HEIGHTS, MD 20791-7103
PO BOX 7104, CAPITOL HEIGHTS, MD 20791-7104
PO BOX 7105, CAPITOL HEIGHTS, MD 20791-7105
PO BOX 7106, CAPITOL HEIGHTS, MD 20791-7106
PO BOX 7107, CAPITOL HEIGHTS, MD 20791-7107
PO BOX 7108, CAPITOL HEIGHTS, MD 20791-7108
PO BOX 7109, CAPITOL HEIGHTS, MD 20791-7109
PO BOX 7110, CAPITOL HEIGHTS, MD 20791-7110
PO BOX 7111, CAPITOL HEIGHTS, MD 20791-7111
PO BOX 7112, CAPITOL HEIGHTS, MD 20791-7112
PO BOX 7113, CAPITOL HEIGHTS, MD 20791-7113
PO BOX 7114, CAPITOL HEIGHTS, MD 20791-7114
PO BOX 7115, CAPITOL HEIGHTS, MD 20791-7115
PO BOX 7116, CAPITOL HEIGHTS, MD 20791-7116
PO BOX 7117, CAPITOL HEIGHTS, MD 20791-7117
PO BOX 7118, CAPITOL HEIGHTS, MD 20791-7118
PO BOX 7119, CAPITOL HEIGHTS, MD 20791-7119
PO BOX 7120, CAPITOL HEIGHTS, MD 20791-7120
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