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 1, SAVAGE, MD 20763-0001
PO BOX 2, SAVAGE, MD 20763-0002
PO BOX 3, SAVAGE, MD 20763-0003
PO BOX 4, SAVAGE, MD 20763-0004
PO BOX 5, SAVAGE, MD 20763-0005
PO BOX 6, SAVAGE, MD 20763-0006
PO BOX 7, SAVAGE, MD 20763-0007
PO BOX 8, SAVAGE, MD 20763-0008
PO BOX 9, SAVAGE, MD 20763-0009
PO BOX 10, SAVAGE, MD 20763-0010
PO BOX 11, SAVAGE, MD 20763-0011
PO BOX 12, SAVAGE, MD 20763-0012
PO BOX 13, SAVAGE, MD 20763-0013
PO BOX 14, SAVAGE, MD 20763-0014
PO BOX 15, SAVAGE, MD 20763-0015
PO BOX 16, SAVAGE, MD 20763-0016
PO BOX 17, SAVAGE, MD 20763-0017
PO BOX 18, SAVAGE, MD 20763-0018
PO BOX 19, SAVAGE, MD 20763-0019
PO BOX 20, SAVAGE, MD 20763-0020
PO BOX 21, SAVAGE, MD 20763-0021
PO BOX 22, SAVAGE, MD 20763-0022
PO BOX 23, SAVAGE, MD 20763-0023
PO BOX 24, SAVAGE, MD 20763-0024
PO BOX 25, SAVAGE, MD 20763-0025
PO BOX 26, SAVAGE, MD 20763-0026
PO BOX 27, SAVAGE, MD 20763-0027
PO BOX 28, SAVAGE, MD 20763-0028
PO BOX 29, SAVAGE, MD 20763-0029
PO BOX 30, SAVAGE, MD 20763-0030
PO BOX 31, SAVAGE, MD 20763-0031
PO BOX 32, SAVAGE, MD 20763-0032
PO BOX 33, SAVAGE, MD 20763-0033
PO BOX 34, SAVAGE, MD 20763-0034
PO BOX 35, SAVAGE, MD 20763-0035
PO BOX 36, SAVAGE, MD 20763-0036
PO BOX 37, SAVAGE, MD 20763-0037
PO BOX 38, SAVAGE, MD 20763-0038
PO BOX 39, SAVAGE, MD 20763-0039
PO BOX 40, SAVAGE, MD 20763-0040
PO BOX 41, SAVAGE, MD 20763-0041
PO BOX 42, SAVAGE, MD 20763-0042
PO BOX 43, SAVAGE, MD 20763-0043
PO BOX 44, SAVAGE, MD 20763-0044
PO BOX 45, SAVAGE, MD 20763-0045
PO BOX 46, SAVAGE, MD 20763-0046
PO BOX 47, SAVAGE, MD 20763-0047
PO BOX 48, SAVAGE, MD 20763-0048
PO BOX 49, SAVAGE, MD 20763-0049
PO BOX 50, SAVAGE, MD 20763-0050
PO BOX 51, SAVAGE, MD 20763-0051
PO BOX 52, SAVAGE, MD 20763-0052
PO BOX 53, SAVAGE, MD 20763-0053
PO BOX 54, SAVAGE, MD 20763-0054
PO BOX 55, SAVAGE, MD 20763-0055
PO BOX 56, SAVAGE, MD 20763-0056
PO BOX 57, SAVAGE, MD 20763-0057
PO BOX 58, SAVAGE, MD 20763-0058
PO BOX 59, SAVAGE, MD 20763-0059
PO BOX 60, SAVAGE, MD 20763-0060
PO BOX 61, SAVAGE, MD 20763-0061
PO BOX 62, SAVAGE, MD 20763-0062
PO BOX 63, SAVAGE, MD 20763-0063
PO BOX 64, SAVAGE, MD 20763-0064
PO BOX 65, SAVAGE, MD 20763-0065
PO BOX 66, SAVAGE, MD 20763-0066
PO BOX 67, SAVAGE, MD 20763-0067
PO BOX 68, SAVAGE, MD 20763-0068
PO BOX 69, SAVAGE, MD 20763-0069
PO BOX 70, SAVAGE, MD 20763-0070
PO BOX 71, SAVAGE, MD 20763-0071
PO BOX 72, SAVAGE, MD 20763-0072
PO BOX 73, SAVAGE, MD 20763-0073
PO BOX 74, SAVAGE, MD 20763-0074
PO BOX 75, SAVAGE, MD 20763-0075
PO BOX 76, SAVAGE, MD 20763-0076
PO BOX 77, SAVAGE, MD 20763-0077
PO BOX 78, SAVAGE, MD 20763-0078
PO BOX 79, SAVAGE, MD 20763-0079
PO BOX 80, SAVAGE, MD 20763-0080
PO BOX 81, SAVAGE, MD 20763-0081
PO BOX 82, SAVAGE, MD 20763-0082
PO BOX 83, SAVAGE, MD 20763-0083
PO BOX 84, SAVAGE, MD 20763-0084
PO BOX 85, SAVAGE, MD 20763-0085
PO BOX 86, SAVAGE, MD 20763-0086
PO BOX 87, SAVAGE, MD 20763-0087
PO BOX 88, SAVAGE, MD 20763-0088
PO BOX 89, SAVAGE, MD 20763-0089
PO BOX 90, SAVAGE, MD 20763-0090
PO BOX 91, SAVAGE, MD 20763-0091
PO BOX 92, SAVAGE, MD 20763-0092
PO BOX 93, SAVAGE, MD 20763-0093
PO BOX 94, SAVAGE, MD 20763-0094
PO BOX 95, SAVAGE, MD 20763-0095
PO BOX 96, SAVAGE, MD 20763-0096
PO BOX 97, SAVAGE, MD 20763-0097
PO BOX 98, SAVAGE, MD 20763-0098
PO BOX 99, SAVAGE, MD 20763-0099
PO BOX 100, SAVAGE, MD 20763-0100
PO BOX 101, SAVAGE, MD 20763-0101
PO BOX 102, SAVAGE, MD 20763-0102
PO BOX 103, SAVAGE, MD 20763-0103
PO BOX 104, SAVAGE, MD 20763-0104
PO BOX 105, SAVAGE, MD 20763-0105
PO BOX 106, SAVAGE, MD 20763-0106
PO BOX 107, SAVAGE, MD 20763-0107
PO BOX 108, SAVAGE, MD 20763-0108
PO BOX 109, SAVAGE, MD 20763-0109
PO BOX 110, SAVAGE, MD 20763-0110
PO BOX 111, SAVAGE, MD 20763-0111
PO BOX 112, SAVAGE, MD 20763-0112
PO BOX 113, SAVAGE, MD 20763-0113
PO BOX 114, SAVAGE, MD 20763-0114
PO BOX 115, SAVAGE, MD 20763-0115
PO BOX 116, SAVAGE, MD 20763-0116
PO BOX 117, SAVAGE, MD 20763-0117
PO BOX 118, SAVAGE, MD 20763-0118
PO BOX 119, SAVAGE, MD 20763-0119
PO BOX 120, SAVAGE, MD 20763-0120
PO BOX 121, SAVAGE, MD 20763-0121
PO BOX 122, SAVAGE, MD 20763-0122
PO BOX 123, SAVAGE, MD 20763-0123
PO BOX 124, SAVAGE, MD 20763-0124
PO BOX 125, SAVAGE, MD 20763-0125
PO BOX 126, SAVAGE, MD 20763-0126
PO BOX 127, SAVAGE, MD 20763-0127
PO BOX 128, SAVAGE, MD 20763-0128
PO BOX 129, SAVAGE, MD 20763-0129
PO BOX 130, SAVAGE, MD 20763-0130
PO BOX 131, SAVAGE, MD 20763-0131
PO BOX 132, SAVAGE, MD 20763-0132
PO BOX 133, SAVAGE, MD 20763-0133
PO BOX 134, SAVAGE, MD 20763-0134
PO BOX 135, SAVAGE, MD 20763-0135
PO BOX 136, SAVAGE, MD 20763-0136
PO BOX 137, SAVAGE, MD 20763-0137
PO BOX 138, SAVAGE, MD 20763-0138
PO BOX 139, SAVAGE, MD 20763-0139
PO BOX 140, SAVAGE, MD 20763-0140
PO BOX 141, SAVAGE, MD 20763-0141
PO BOX 142, SAVAGE, MD 20763-0142
PO BOX 143, SAVAGE, MD 20763-0143
PO BOX 144, SAVAGE, MD 20763-0144
PO BOX 145, SAVAGE, MD 20763-0145
PO BOX 146, SAVAGE, MD 20763-0146
PO BOX 147, SAVAGE, MD 20763-0147
PO BOX 148, SAVAGE, MD 20763-0148
PO BOX 149, SAVAGE, MD 20763-0149
PO BOX 150, SAVAGE, MD 20763-0150
PO BOX 151, SAVAGE, MD 20763-0151
PO BOX 152, SAVAGE, MD 20763-0152
PO BOX 153, SAVAGE, MD 20763-0153
PO BOX 154, SAVAGE, MD 20763-0154
PO BOX 155, SAVAGE, MD 20763-0155
PO BOX 156, SAVAGE, MD 20763-0156
PO BOX 157, SAVAGE, MD 20763-0157
PO BOX 158, SAVAGE, MD 20763-0158
PO BOX 159, SAVAGE, MD 20763-0159
PO BOX 160, SAVAGE, MD 20763-0160
PO BOX 161, SAVAGE, MD 20763-0161
PO BOX 162, SAVAGE, MD 20763-0162
PO BOX 163, SAVAGE, MD 20763-0163
PO BOX 164, SAVAGE, MD 20763-0164
PO BOX 165, SAVAGE, MD 20763-0165
PO BOX 166, SAVAGE, MD 20763-0166
PO BOX 167, SAVAGE, MD 20763-0167
PO BOX 168, SAVAGE, MD 20763-0168
PO BOX 169, SAVAGE, MD 20763-0169
PO BOX 170, SAVAGE, MD 20763-0170
PO BOX 171, SAVAGE, MD 20763-0171
PO BOX 172, SAVAGE, MD 20763-0172
PO BOX 173, SAVAGE, MD 20763-0173
PO BOX 174, SAVAGE, MD 20763-0174
PO BOX 175, SAVAGE, MD 20763-0175
PO BOX 176, SAVAGE, MD 20763-0176
PO BOX 177, SAVAGE, MD 20763-0177
PO BOX 178, SAVAGE, MD 20763-0178
PO BOX 179, SAVAGE, MD 20763-0179
PO BOX 180, SAVAGE, MD 20763-0180
PO BOX 181, SAVAGE, MD 20763-0181
PO BOX 182, SAVAGE, MD 20763-0182
PO BOX 183, SAVAGE, MD 20763-0183
PO BOX 184, SAVAGE, MD 20763-0184
PO BOX 185, SAVAGE, MD 20763-0185
PO BOX 186, SAVAGE, MD 20763-0186
PO BOX 187, SAVAGE, MD 20763-0187
PO BOX 188, SAVAGE, MD 20763-0188
PO BOX 189, SAVAGE, MD 20763-0189
PO BOX 190, SAVAGE, MD 20763-0190
PO BOX 191, SAVAGE, MD 20763-0191
PO BOX 192, SAVAGE, MD 20763-0192
PO BOX 193, SAVAGE, MD 20763-0193
PO BOX 194, SAVAGE, MD 20763-0194
PO BOX 195, SAVAGE, MD 20763-0195
PO BOX 196, SAVAGE, MD 20763-0196
PO BOX 197, SAVAGE, MD 20763-0197
PO BOX 198, SAVAGE, MD 20763-0198
PO BOX 199, SAVAGE, MD 20763-0199
PO BOX 200, SAVAGE, MD 20763-0200
PO BOX 201, SAVAGE, MD 20763-0201
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