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, MARYDEL, DE 19964-0001
PO BOX 2, MARYDEL, DE 19964-0002
PO BOX 3, MARYDEL, DE 19964-0003
PO BOX 4, MARYDEL, DE 19964-0004
PO BOX 5, MARYDEL, DE 19964-0005
PO BOX 6, MARYDEL, DE 19964-0006
PO BOX 7, MARYDEL, DE 19964-0007
PO BOX 8, MARYDEL, DE 19964-0008
PO BOX 9, MARYDEL, DE 19964-0009
PO BOX 10, MARYDEL, DE 19964-0010
PO BOX 11, MARYDEL, DE 19964-0011
PO BOX 12, MARYDEL, DE 19964-0012
PO BOX 13, MARYDEL, DE 19964-0013
PO BOX 14, MARYDEL, DE 19964-0014
PO BOX 15, MARYDEL, DE 19964-0015
PO BOX 16, MARYDEL, DE 19964-0016
PO BOX 17, MARYDEL, DE 19964-0017
PO BOX 18, MARYDEL, DE 19964-0018
PO BOX 19, MARYDEL, DE 19964-0019
PO BOX 20, MARYDEL, DE 19964-0020
PO BOX 21, MARYDEL, DE 19964-0021
PO BOX 22, MARYDEL, DE 19964-0022
PO BOX 23, MARYDEL, DE 19964-0023
PO BOX 24, MARYDEL, DE 19964-0024
PO BOX 25, MARYDEL, DE 19964-0025
PO BOX 26, MARYDEL, DE 19964-0026
PO BOX 27, MARYDEL, DE 19964-0027
PO BOX 28, MARYDEL, DE 19964-0028
PO BOX 29, MARYDEL, DE 19964-0029
PO BOX 30, MARYDEL, DE 19964-0030
PO BOX 31, MARYDEL, DE 19964-0031
PO BOX 32, MARYDEL, DE 19964-0032
PO BOX 33, MARYDEL, DE 19964-0033
PO BOX 34, MARYDEL, DE 19964-0034
PO BOX 35, MARYDEL, DE 19964-0035
PO BOX 36, MARYDEL, DE 19964-0036
PO BOX 37, MARYDEL, DE 19964-0037
PO BOX 38, MARYDEL, DE 19964-0038
PO BOX 39, MARYDEL, DE 19964-0039
PO BOX 40, MARYDEL, DE 19964-0040
PO BOX 41, MARYDEL, DE 19964-0041
PO BOX 42, MARYDEL, DE 19964-0042
PO BOX 43, MARYDEL, DE 19964-0043
PO BOX 44, MARYDEL, DE 19964-0044
PO BOX 45, MARYDEL, DE 19964-0045
PO BOX 46, MARYDEL, DE 19964-0046
PO BOX 47, MARYDEL, DE 19964-0047
PO BOX 48, MARYDEL, DE 19964-0048
PO BOX 49, MARYDEL, DE 19964-0049
PO BOX 50, MARYDEL, DE 19964-0050
PO BOX 51, MARYDEL, DE 19964-0051
PO BOX 52, MARYDEL, DE 19964-0052
PO BOX 53, MARYDEL, DE 19964-0053
PO BOX 54, MARYDEL, DE 19964-0054
PO BOX 55, MARYDEL, DE 19964-0055
PO BOX 56, MARYDEL, DE 19964-0056
PO BOX 57, MARYDEL, DE 19964-0057
PO BOX 58, MARYDEL, DE 19964-0058
PO BOX 59, MARYDEL, DE 19964-0059
PO BOX 60, MARYDEL, DE 19964-0060
PO BOX 61, MARYDEL, DE 19964-0061
PO BOX 62, MARYDEL, DE 19964-0062
PO BOX 63, MARYDEL, DE 19964-0063
PO BOX 64, MARYDEL, DE 19964-0064
PO BOX 65, MARYDEL, DE 19964-0065
PO BOX 66, MARYDEL, DE 19964-0066
PO BOX 67, MARYDEL, DE 19964-0067
PO BOX 68, MARYDEL, DE 19964-0068
PO BOX 69, MARYDEL, DE 19964-0069
PO BOX 70, MARYDEL, DE 19964-0070
PO BOX 71, MARYDEL, DE 19964-0071
PO BOX 72, MARYDEL, DE 19964-0072
PO BOX 73, MARYDEL, DE 19964-0073
PO BOX 74, MARYDEL, DE 19964-0074
PO BOX 75, MARYDEL, DE 19964-0075
PO BOX 76, MARYDEL, DE 19964-0076
PO BOX 77, MARYDEL, DE 19964-0077
PO BOX 78, MARYDEL, DE 19964-0078
PO BOX 79, MARYDEL, DE 19964-0079
PO BOX 80, MARYDEL, DE 19964-0080
PO BOX 81, MARYDEL, DE 19964-0081
PO BOX 82, MARYDEL, DE 19964-0082
PO BOX 83, MARYDEL, DE 19964-0083
PO BOX 84, MARYDEL, DE 19964-0084
PO BOX 85, MARYDEL, DE 19964-0085
PO BOX 86, MARYDEL, DE 19964-0086
PO BOX 87, MARYDEL, DE 19964-0087
PO BOX 88, MARYDEL, DE 19964-0088
PO BOX 89, MARYDEL, DE 19964-0089
PO BOX 90, MARYDEL, DE 19964-0090
PO BOX 91, MARYDEL, DE 19964-0091
PO BOX 92, MARYDEL, DE 19964-0092
PO BOX 93, MARYDEL, DE 19964-0093
PO BOX 94, MARYDEL, DE 19964-0094
PO BOX 95, MARYDEL, DE 19964-0095
PO BOX 96, MARYDEL, DE 19964-0096
PO BOX 97, MARYDEL, DE 19964-0097
PO BOX 98, MARYDEL, DE 19964-0098
PO BOX 99, MARYDEL, DE 19964-0099
PO BOX 100, MARYDEL, DE 19964-0100
PO BOX 101, MARYDEL, DE 19964-0101
PO BOX 102, MARYDEL, DE 19964-0102
PO BOX 103, MARYDEL, DE 19964-0103
PO BOX 104, MARYDEL, DE 19964-0104
PO BOX 105, MARYDEL, DE 19964-0105
PO BOX 106, MARYDEL, DE 19964-0106
PO BOX 107, MARYDEL, DE 19964-0107
PO BOX 108, MARYDEL, DE 19964-0108
PO BOX 109, MARYDEL, DE 19964-0109
PO BOX 110, MARYDEL, DE 19964-0110
PO BOX 111, MARYDEL, DE 19964-0111
PO BOX 112, MARYDEL, DE 19964-0112
PO BOX 113, MARYDEL, DE 19964-0113
PO BOX 114, MARYDEL, DE 19964-0114
PO BOX 115, MARYDEL, DE 19964-0115
PO BOX 116, MARYDEL, DE 19964-0116
PO BOX 117, MARYDEL, DE 19964-0117
PO BOX 118, MARYDEL, DE 19964-0118
PO BOX 119, MARYDEL, DE 19964-0119
PO BOX 120, MARYDEL, DE 19964-0120
PO BOX 121, MARYDEL, DE 19964-0121
PO BOX 122, MARYDEL, DE 19964-0122
PO BOX 123, MARYDEL, DE 19964-0123
PO BOX 124, MARYDEL, DE 19964-0124
PO BOX 125, MARYDEL, DE 19964-0125
PO BOX 126, MARYDEL, DE 19964-0126
PO BOX 127, MARYDEL, DE 19964-0127
PO BOX 128, MARYDEL, DE 19964-0128
PO BOX 129, MARYDEL, DE 19964-0129
PO BOX 130, MARYDEL, DE 19964-0130
PO BOX 131, MARYDEL, DE 19964-0131
PO BOX 132, MARYDEL, DE 19964-0132
PO BOX 133, MARYDEL, DE 19964-0133
PO BOX 134, MARYDEL, DE 19964-0134
PO BOX 135, MARYDEL, DE 19964-0135
PO BOX 136, MARYDEL, DE 19964-0136
PO BOX 137, MARYDEL, DE 19964-0137
PO BOX 138, MARYDEL, DE 19964-0138
PO BOX 139, MARYDEL, DE 19964-0139
PO BOX 140, MARYDEL, DE 19964-0140
PO BOX 141, MARYDEL, DE 19964-0141
PO BOX 142, MARYDEL, DE 19964-0142
PO BOX 143, MARYDEL, DE 19964-0143
PO BOX 144, MARYDEL, DE 19964-0144
PO BOX 145, MARYDEL, DE 19964-0145
PO BOX 146, MARYDEL, DE 19964-0146
PO BOX 147, MARYDEL, DE 19964-0147
PO BOX 148, MARYDEL, DE 19964-0148
PO BOX 149, MARYDEL, DE 19964-0149
PO BOX 150, MARYDEL, DE 19964-0150
PO BOX 151, MARYDEL, DE 19964-0151
PO BOX 152, MARYDEL, DE 19964-0152
PO BOX 153, MARYDEL, DE 19964-0153
PO BOX 154, MARYDEL, DE 19964-0154
PO BOX 155, MARYDEL, DE 19964-0155
PO BOX 156, MARYDEL, DE 19964-0156
PO BOX 157, MARYDEL, DE 19964-0157
PO BOX 158, MARYDEL, DE 19964-0158
PO BOX 159, MARYDEL, DE 19964-0159
PO BOX 160, MARYDEL, DE 19964-0160
PO BOX 161, MARYDEL, DE 19964-0161
PO BOX 162, MARYDEL, DE 19964-0162
PO BOX 163, MARYDEL, DE 19964-0163
PO BOX 164, MARYDEL, DE 19964-0164
PO BOX 165, MARYDEL, DE 19964-0165
PO BOX 166, MARYDEL, DE 19964-0166
PO BOX 167, MARYDEL, DE 19964-0167
PO BOX 168, MARYDEL, DE 19964-0168
PO BOX 169, MARYDEL, DE 19964-0169
PO BOX 170, MARYDEL, DE 19964-0170
PO BOX 171, MARYDEL, DE 19964-0171
PO BOX 172, MARYDEL, DE 19964-0172
PO BOX 173, MARYDEL, DE 19964-0173
PO BOX 174, MARYDEL, DE 19964-0174
PO BOX 175, MARYDEL, DE 19964-0175
PO BOX 176, MARYDEL, DE 19964-0176
PO BOX 177, MARYDEL, DE 19964-0177
PO BOX 178, MARYDEL, DE 19964-0178
PO BOX 179, MARYDEL, DE 19964-0179
PO BOX 180, MARYDEL, DE 19964-0180
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