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, RIDGEWOOD, NJ 07451-0001
PO BOX 2, RIDGEWOOD, NJ 07451-0002
PO BOX 3, RIDGEWOOD, NJ 07451-0003
PO BOX 4, RIDGEWOOD, NJ 07451-0004
PO BOX 5, RIDGEWOOD, NJ 07451-0005
PO BOX 6, RIDGEWOOD, NJ 07451-0006
PO BOX 7, RIDGEWOOD, NJ 07451-0007
PO BOX 8, RIDGEWOOD, NJ 07451-0008
PO BOX 9, RIDGEWOOD, NJ 07451-0009
PO BOX 10, RIDGEWOOD, NJ 07451-0010
PO BOX 11, RIDGEWOOD, NJ 07451-0011
PO BOX 12, RIDGEWOOD, NJ 07451-0012
PO BOX 13, RIDGEWOOD, NJ 07451-0013
PO BOX 14, RIDGEWOOD, NJ 07451-0014
PO BOX 15, RIDGEWOOD, NJ 07451-0015
PO BOX 16, RIDGEWOOD, NJ 07451-0016
PO BOX 17, RIDGEWOOD, NJ 07451-0017
PO BOX 18, RIDGEWOOD, NJ 07451-0018
PO BOX 19, RIDGEWOOD, NJ 07451-0019
PO BOX 20, RIDGEWOOD, NJ 07451-0020
PO BOX 21, RIDGEWOOD, NJ 07451-0021
PO BOX 22, RIDGEWOOD, NJ 07451-0022
PO BOX 23, RIDGEWOOD, NJ 07451-0023
PO BOX 24, RIDGEWOOD, NJ 07451-0024
PO BOX 25, RIDGEWOOD, NJ 07451-0025
PO BOX 26, RIDGEWOOD, NJ 07451-0026
PO BOX 27, RIDGEWOOD, NJ 07451-0027
PO BOX 28, RIDGEWOOD, NJ 07451-0028
PO BOX 29, RIDGEWOOD, NJ 07451-0029
PO BOX 30, RIDGEWOOD, NJ 07451-0030
PO BOX 31, RIDGEWOOD, NJ 07451-0031
PO BOX 32, RIDGEWOOD, NJ 07451-0032
PO BOX 33, RIDGEWOOD, NJ 07451-0033
PO BOX 34, RIDGEWOOD, NJ 07451-0034
PO BOX 35, RIDGEWOOD, NJ 07451-0035
PO BOX 36, RIDGEWOOD, NJ 07451-0036
PO BOX 37, RIDGEWOOD, NJ 07451-0037
PO BOX 38, RIDGEWOOD, NJ 07451-0038
PO BOX 39, RIDGEWOOD, NJ 07451-0039
PO BOX 40, RIDGEWOOD, NJ 07451-0040
PO BOX 41, RIDGEWOOD, NJ 07451-0041
PO BOX 42, RIDGEWOOD, NJ 07451-0042
PO BOX 43, RIDGEWOOD, NJ 07451-0043
PO BOX 44, RIDGEWOOD, NJ 07451-0044
PO BOX 45, RIDGEWOOD, NJ 07451-0045
PO BOX 46, RIDGEWOOD, NJ 07451-0046
PO BOX 47, RIDGEWOOD, NJ 07451-0047
PO BOX 48, RIDGEWOOD, NJ 07451-0048
PO BOX 49, RIDGEWOOD, NJ 07451-0049
PO BOX 50, RIDGEWOOD, NJ 07451-0050
PO BOX 51, RIDGEWOOD, NJ 07451-0051
PO BOX 52, RIDGEWOOD, NJ 07451-0052
PO BOX 53, RIDGEWOOD, NJ 07451-0053
PO BOX 54, RIDGEWOOD, NJ 07451-0054
PO BOX 55, RIDGEWOOD, NJ 07451-0055
PO BOX 56, RIDGEWOOD, NJ 07451-0056
PO BOX 57, RIDGEWOOD, NJ 07451-0057
PO BOX 58, RIDGEWOOD, NJ 07451-0058
PO BOX 59, RIDGEWOOD, NJ 07451-0059
PO BOX 60, RIDGEWOOD, NJ 07451-0060
PO BOX 61, RIDGEWOOD, NJ 07451-0061
PO BOX 62, RIDGEWOOD, NJ 07451-0062
PO BOX 63, RIDGEWOOD, NJ 07451-0063
PO BOX 64, RIDGEWOOD, NJ 07451-0064
PO BOX 65, RIDGEWOOD, NJ 07451-0065
PO BOX 66, RIDGEWOOD, NJ 07451-0066
PO BOX 67, RIDGEWOOD, NJ 07451-0067
PO BOX 68, RIDGEWOOD, NJ 07451-0068
PO BOX 69, RIDGEWOOD, NJ 07451-0069
PO BOX 70, RIDGEWOOD, NJ 07451-0070
PO BOX 71, RIDGEWOOD, NJ 07451-0071
PO BOX 72, RIDGEWOOD, NJ 07451-0072
PO BOX 73, RIDGEWOOD, NJ 07451-0073
PO BOX 74, RIDGEWOOD, NJ 07451-0074
PO BOX 75, RIDGEWOOD, NJ 07451-0075
PO BOX 76, RIDGEWOOD, NJ 07451-0076
PO BOX 77, RIDGEWOOD, NJ 07451-0077
PO BOX 78, RIDGEWOOD, NJ 07451-0078
PO BOX 79, RIDGEWOOD, NJ 07451-0079
PO BOX 80, RIDGEWOOD, NJ 07451-0080
PO BOX 81, RIDGEWOOD, NJ 07451-0081
PO BOX 82, RIDGEWOOD, NJ 07451-0082
PO BOX 83, RIDGEWOOD, NJ 07451-0083
PO BOX 84, RIDGEWOOD, NJ 07451-0084
PO BOX 85, RIDGEWOOD, NJ 07451-0085
PO BOX 86, RIDGEWOOD, NJ 07451-0086
PO BOX 87, RIDGEWOOD, NJ 07451-0087
PO BOX 88, RIDGEWOOD, NJ 07451-0088
PO BOX 89, RIDGEWOOD, NJ 07451-0089
PO BOX 90, RIDGEWOOD, NJ 07451-0090
PO BOX 91, RIDGEWOOD, NJ 07451-0091
PO BOX 92, RIDGEWOOD, NJ 07451-0092
PO BOX 93, RIDGEWOOD, NJ 07451-0093
PO BOX 94, RIDGEWOOD, NJ 07451-0094
PO BOX 95, RIDGEWOOD, NJ 07451-0095
PO BOX 96, RIDGEWOOD, NJ 07451-0096
PO BOX 97, RIDGEWOOD, NJ 07451-0097
PO BOX 98, RIDGEWOOD, NJ 07451-0098
PO BOX 99, RIDGEWOOD, NJ 07451-0099
PO BOX 100, RIDGEWOOD, NJ 07451-0100
PO BOX 101, RIDGEWOOD, NJ 07451-0101
PO BOX 102, RIDGEWOOD, NJ 07451-0102
PO BOX 103, RIDGEWOOD, NJ 07451-0103
PO BOX 104, RIDGEWOOD, NJ 07451-0104
PO BOX 105, RIDGEWOOD, NJ 07451-0105
PO BOX 106, RIDGEWOOD, NJ 07451-0106
PO BOX 107, RIDGEWOOD, NJ 07451-0107
PO BOX 108, RIDGEWOOD, NJ 07451-0108
PO BOX 109, RIDGEWOOD, NJ 07451-0109
PO BOX 110, RIDGEWOOD, NJ 07451-0110
PO BOX 111, RIDGEWOOD, NJ 07451-0111
PO BOX 112, RIDGEWOOD, NJ 07451-0112
PO BOX 113, RIDGEWOOD, NJ 07451-0113
PO BOX 114, RIDGEWOOD, NJ 07451-0114
PO BOX 115, RIDGEWOOD, NJ 07451-0115
PO BOX 116, RIDGEWOOD, NJ 07451-0116
PO BOX 117, RIDGEWOOD, NJ 07451-0117
PO BOX 118, RIDGEWOOD, NJ 07451-0118
PO BOX 119, RIDGEWOOD, NJ 07451-0119
PO BOX 120, RIDGEWOOD, NJ 07451-0120
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