หมายเลขตู้ป ณ . ต้องน้อยกว่าหรือมากกว่าสี่หลัก สำหรับตู้ไปรษณีย์กฎทั่วไปคือแต่ละกล่องจะมีรหัส ZIP + 4 ของตัวเอง
ตัวเลขสี่หลักสุดท้ายมักเป็นตัวเลขใดตัวหนึ่งต่อไปนี้:
1. ศูนย์บวกสามหลักสุดท้ายของหมายเลขกล่อง (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. สี่หลักสุดท้ายของหมายเลขกล่อง (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. หากหมายเลขกล่องน้อยกว่าสี่หลักให้มีเลขศูนย์ที่อยู่ข้างหน้าหมายเลขกล่องมากพอเพื่อสร้างตัวเลขสี่หลัก(eg. PO BOX 1, Shreveport LA 71161-0001).
อย่างไรก็ตามไม่มีกฎที่เหมือนกันรหัสไปรษณีย์บวกสี่ใช้สำหรับการอ้างอิงเท่านั้นต้องค้นหารหัส ZIP + 4 ทีละกล่องในเว็บไซต์ทางการของ USPS
PO BOX 1, SCHOOLEYS MOUNTAIN, NJ 07870-0001
PO BOX 2, SCHOOLEYS MOUNTAIN, NJ 07870-0002
PO BOX 3, SCHOOLEYS MOUNTAIN, NJ 07870-0003
PO BOX 4, SCHOOLEYS MOUNTAIN, NJ 07870-0004
PO BOX 5, SCHOOLEYS MOUNTAIN, NJ 07870-0005
PO BOX 6, SCHOOLEYS MOUNTAIN, NJ 07870-0006
PO BOX 7, SCHOOLEYS MOUNTAIN, NJ 07870-0007
PO BOX 8, SCHOOLEYS MOUNTAIN, NJ 07870-0008
PO BOX 9, SCHOOLEYS MOUNTAIN, NJ 07870-0009
PO BOX 10, SCHOOLEYS MOUNTAIN, NJ 07870-0010
PO BOX 11, SCHOOLEYS MOUNTAIN, NJ 07870-0011
PO BOX 12, SCHOOLEYS MOUNTAIN, NJ 07870-0012
PO BOX 13, SCHOOLEYS MOUNTAIN, NJ 07870-0013
PO BOX 14, SCHOOLEYS MOUNTAIN, NJ 07870-0014
PO BOX 15, SCHOOLEYS MOUNTAIN, NJ 07870-0015
PO BOX 16, SCHOOLEYS MOUNTAIN, NJ 07870-0016
PO BOX 17, SCHOOLEYS MOUNTAIN, NJ 07870-0017
PO BOX 18, SCHOOLEYS MOUNTAIN, NJ 07870-0018
PO BOX 19, SCHOOLEYS MOUNTAIN, NJ 07870-0019
PO BOX 20, SCHOOLEYS MOUNTAIN, NJ 07870-0020
PO BOX 21, SCHOOLEYS MOUNTAIN, NJ 07870-0021
PO BOX 22, SCHOOLEYS MOUNTAIN, NJ 07870-0022
PO BOX 23, SCHOOLEYS MOUNTAIN, NJ 07870-0023
PO BOX 24, SCHOOLEYS MOUNTAIN, NJ 07870-0024
PO BOX 25, SCHOOLEYS MOUNTAIN, NJ 07870-0025
PO BOX 26, SCHOOLEYS MOUNTAIN, NJ 07870-0026
PO BOX 27, SCHOOLEYS MOUNTAIN, NJ 07870-0027
PO BOX 28, SCHOOLEYS MOUNTAIN, NJ 07870-0028
PO BOX 29, SCHOOLEYS MOUNTAIN, NJ 07870-0029
PO BOX 30, SCHOOLEYS MOUNTAIN, NJ 07870-0030
PO BOX 31, SCHOOLEYS MOUNTAIN, NJ 07870-0031
PO BOX 32, SCHOOLEYS MOUNTAIN, NJ 07870-0032
PO BOX 33, SCHOOLEYS MOUNTAIN, NJ 07870-0033
PO BOX 34, SCHOOLEYS MOUNTAIN, NJ 07870-0034
PO BOX 35, SCHOOLEYS MOUNTAIN, NJ 07870-0035
PO BOX 36, SCHOOLEYS MOUNTAIN, NJ 07870-0036
PO BOX 37, SCHOOLEYS MOUNTAIN, NJ 07870-0037
PO BOX 38, SCHOOLEYS MOUNTAIN, NJ 07870-0038
PO BOX 39, SCHOOLEYS MOUNTAIN, NJ 07870-0039
PO BOX 40, SCHOOLEYS MOUNTAIN, NJ 07870-0040
PO BOX 41, SCHOOLEYS MOUNTAIN, NJ 07870-0041
PO BOX 42, SCHOOLEYS MOUNTAIN, NJ 07870-0042
PO BOX 43, SCHOOLEYS MOUNTAIN, NJ 07870-0043
PO BOX 44, SCHOOLEYS MOUNTAIN, NJ 07870-0044
PO BOX 45, SCHOOLEYS MOUNTAIN, NJ 07870-0045
PO BOX 46, SCHOOLEYS MOUNTAIN, NJ 07870-0046
PO BOX 47, SCHOOLEYS MOUNTAIN, NJ 07870-0047
PO BOX 48, SCHOOLEYS MOUNTAIN, NJ 07870-0048
PO BOX 49, SCHOOLEYS MOUNTAIN, NJ 07870-0049
PO BOX 50, SCHOOLEYS MOUNTAIN, NJ 07870-0050
PO BOX 51, SCHOOLEYS MOUNTAIN, NJ 07870-0051
PO BOX 52, SCHOOLEYS MOUNTAIN, NJ 07870-0052
PO BOX 53, SCHOOLEYS MOUNTAIN, NJ 07870-0053
PO BOX 54, SCHOOLEYS MOUNTAIN, NJ 07870-0054
PO BOX 55, SCHOOLEYS MOUNTAIN, NJ 07870-0055
PO BOX 56, SCHOOLEYS MOUNTAIN, NJ 07870-0056
PO BOX 57, SCHOOLEYS MOUNTAIN, NJ 07870-0057
PO BOX 58, SCHOOLEYS MOUNTAIN, NJ 07870-0058
PO BOX 59, SCHOOLEYS MOUNTAIN, NJ 07870-0059
PO BOX 60, SCHOOLEYS MOUNTAIN, NJ 07870-0060
PO BOX 61, SCHOOLEYS MOUNTAIN, NJ 07870-0061
PO BOX 62, SCHOOLEYS MOUNTAIN, NJ 07870-0062
PO BOX 63, SCHOOLEYS MOUNTAIN, NJ 07870-0063
PO BOX 64, SCHOOLEYS MOUNTAIN, NJ 07870-0064
PO BOX 65, SCHOOLEYS MOUNTAIN, NJ 07870-0065
PO BOX 66, SCHOOLEYS MOUNTAIN, NJ 07870-0066
PO BOX 67, SCHOOLEYS MOUNTAIN, NJ 07870-0067
PO BOX 68, SCHOOLEYS MOUNTAIN, NJ 07870-0068
PO BOX 69, SCHOOLEYS MOUNTAIN, NJ 07870-0069
PO BOX 70, SCHOOLEYS MOUNTAIN, NJ 07870-0070
PO BOX 71, SCHOOLEYS MOUNTAIN, NJ 07870-0071
PO BOX 72, SCHOOLEYS MOUNTAIN, NJ 07870-0072
PO BOX 73, SCHOOLEYS MOUNTAIN, NJ 07870-0073
PO BOX 74, SCHOOLEYS MOUNTAIN, NJ 07870-0074
PO BOX 75, SCHOOLEYS MOUNTAIN, NJ 07870-0075
PO BOX 76, SCHOOLEYS MOUNTAIN, NJ 07870-0076
PO BOX 77, SCHOOLEYS MOUNTAIN, NJ 07870-0077
PO BOX 78, SCHOOLEYS MOUNTAIN, NJ 07870-0078
PO BOX 79, SCHOOLEYS MOUNTAIN, NJ 07870-0079
PO BOX 80, SCHOOLEYS MOUNTAIN, NJ 07870-0080
PO BOX 81, SCHOOLEYS MOUNTAIN, NJ 07870-0081
PO BOX 82, SCHOOLEYS MOUNTAIN, NJ 07870-0082
PO BOX 83, SCHOOLEYS MOUNTAIN, NJ 07870-0083
PO BOX 84, SCHOOLEYS MOUNTAIN, NJ 07870-0084
PO BOX 85, SCHOOLEYS MOUNTAIN, NJ 07870-0085
PO BOX 86, SCHOOLEYS MOUNTAIN, NJ 07870-0086
PO BOX 87, SCHOOLEYS MOUNTAIN, NJ 07870-0087
PO BOX 88, SCHOOLEYS MOUNTAIN, NJ 07870-0088
PO BOX 89, SCHOOLEYS MOUNTAIN, NJ 07870-0089
PO BOX 90, SCHOOLEYS MOUNTAIN, NJ 07870-0090
PO BOX 91, SCHOOLEYS MOUNTAIN, NJ 07870-0091
PO BOX 92, SCHOOLEYS MOUNTAIN, NJ 07870-0092
PO BOX 93, SCHOOLEYS MOUNTAIN, NJ 07870-0093
PO BOX 94, SCHOOLEYS MOUNTAIN, NJ 07870-0094
PO BOX 95, SCHOOLEYS MOUNTAIN, NJ 07870-0095
PO BOX 96, SCHOOLEYS MOUNTAIN, NJ 07870-0096
PO BOX 97, SCHOOLEYS MOUNTAIN, NJ 07870-0097
PO BOX 98, SCHOOLEYS MOUNTAIN, NJ 07870-0098
PO BOX 99, SCHOOLEYS MOUNTAIN, NJ 07870-0099
PO BOX 100, SCHOOLEYS MOUNTAIN, NJ 07870-0100
PO BOX 101, SCHOOLEYS MOUNTAIN, NJ 07870-0101
PO BOX 102, SCHOOLEYS MOUNTAIN, NJ 07870-0102
PO BOX 103, SCHOOLEYS MOUNTAIN, NJ 07870-0103
PO BOX 104, SCHOOLEYS MOUNTAIN, NJ 07870-0104
PO BOX 105, SCHOOLEYS MOUNTAIN, NJ 07870-0105
PO BOX 106, SCHOOLEYS MOUNTAIN, NJ 07870-0106
PO BOX 107, SCHOOLEYS MOUNTAIN, NJ 07870-0107
PO BOX 108, SCHOOLEYS MOUNTAIN, NJ 07870-0108
PO BOX 109, SCHOOLEYS MOUNTAIN, NJ 07870-0109
PO BOX 110, SCHOOLEYS MOUNTAIN, NJ 07870-0110
PO BOX 111, SCHOOLEYS MOUNTAIN, NJ 07870-0111
PO BOX 112, SCHOOLEYS MOUNTAIN, NJ 07870-0112
PO BOX 113, SCHOOLEYS MOUNTAIN, NJ 07870-0113
PO BOX 114, SCHOOLEYS MOUNTAIN, NJ 07870-0114
PO BOX 115, SCHOOLEYS MOUNTAIN, NJ 07870-0115
PO BOX 116, SCHOOLEYS MOUNTAIN, NJ 07870-0116
PO BOX 117, SCHOOLEYS MOUNTAIN, NJ 07870-0117
PO BOX 118, SCHOOLEYS MOUNTAIN, NJ 07870-0118
PO BOX 119, SCHOOLEYS MOUNTAIN, NJ 07870-0119
PO BOX 120, SCHOOLEYS MOUNTAIN, NJ 07870-0120
PO BOX 121, SCHOOLEYS MOUNTAIN, NJ 07870-0121
PO BOX 122, SCHOOLEYS MOUNTAIN, NJ 07870-0122
PO BOX 123, SCHOOLEYS MOUNTAIN, NJ 07870-0123
PO BOX 124, SCHOOLEYS MOUNTAIN, NJ 07870-0124
PO BOX 125, SCHOOLEYS MOUNTAIN, NJ 07870-0125
PO BOX 126, SCHOOLEYS MOUNTAIN, NJ 07870-0126
PO BOX 127, SCHOOLEYS MOUNTAIN, NJ 07870-0127
PO BOX 128, SCHOOLEYS MOUNTAIN, NJ 07870-0128
PO BOX 129, SCHOOLEYS MOUNTAIN, NJ 07870-0129
PO BOX 130, SCHOOLEYS MOUNTAIN, NJ 07870-0130
PO BOX 131, SCHOOLEYS MOUNTAIN, NJ 07870-0131
PO BOX 132, SCHOOLEYS MOUNTAIN, NJ 07870-0132
PO BOX 133, SCHOOLEYS MOUNTAIN, NJ 07870-0133
PO BOX 134, SCHOOLEYS MOUNTAIN, NJ 07870-0134
PO BOX 135, SCHOOLEYS MOUNTAIN, NJ 07870-0135
PO BOX 136, SCHOOLEYS MOUNTAIN, NJ 07870-0136
PO BOX 137, SCHOOLEYS MOUNTAIN, NJ 07870-0137
PO BOX 138, SCHOOLEYS MOUNTAIN, NJ 07870-0138
PO BOX 139, SCHOOLEYS MOUNTAIN, NJ 07870-0139
PO BOX 140, SCHOOLEYS MOUNTAIN, NJ 07870-0140
PO BOX 141, SCHOOLEYS MOUNTAIN, NJ 07870-0141
PO BOX 142, SCHOOLEYS MOUNTAIN, NJ 07870-0142
PO BOX 143, SCHOOLEYS MOUNTAIN, NJ 07870-0143
PO BOX 144, SCHOOLEYS MOUNTAIN, NJ 07870-0144
PO BOX 145, SCHOOLEYS MOUNTAIN, NJ 07870-0145
PO BOX 146, SCHOOLEYS MOUNTAIN, NJ 07870-0146
PO BOX 147, SCHOOLEYS MOUNTAIN, NJ 07870-0147
PO BOX 148, SCHOOLEYS MOUNTAIN, NJ 07870-0148
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