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, MANAHAWKIN, NJ 08050-0001
PO BOX 2, MANAHAWKIN, NJ 08050-0002
PO BOX 3, MANAHAWKIN, NJ 08050-0003
PO BOX 4, MANAHAWKIN, NJ 08050-0004
PO BOX 5, MANAHAWKIN, NJ 08050-0005
PO BOX 6, MANAHAWKIN, NJ 08050-0006
PO BOX 7, MANAHAWKIN, NJ 08050-0007
PO BOX 8, MANAHAWKIN, NJ 08050-0008
PO BOX 9, MANAHAWKIN, NJ 08050-0009
PO BOX 10, MANAHAWKIN, NJ 08050-0010
PO BOX 11, MANAHAWKIN, NJ 08050-0011
PO BOX 12, MANAHAWKIN, NJ 08050-0012
PO BOX 13, MANAHAWKIN, NJ 08050-0013
PO BOX 14, MANAHAWKIN, NJ 08050-0014
PO BOX 15, MANAHAWKIN, NJ 08050-0015
PO BOX 16, MANAHAWKIN, NJ 08050-0016
PO BOX 17, MANAHAWKIN, NJ 08050-0017
PO BOX 18, MANAHAWKIN, NJ 08050-0018
PO BOX 19, MANAHAWKIN, NJ 08050-0019
PO BOX 20, MANAHAWKIN, NJ 08050-0020
PO BOX 21, MANAHAWKIN, NJ 08050-0021
PO BOX 22, MANAHAWKIN, NJ 08050-0022
PO BOX 23, MANAHAWKIN, NJ 08050-0023
PO BOX 24, MANAHAWKIN, NJ 08050-0024
PO BOX 25, MANAHAWKIN, NJ 08050-0025
PO BOX 26, MANAHAWKIN, NJ 08050-0026
PO BOX 27, MANAHAWKIN, NJ 08050-0027
PO BOX 28, MANAHAWKIN, NJ 08050-0028
PO BOX 29, MANAHAWKIN, NJ 08050-0029
PO BOX 30, MANAHAWKIN, NJ 08050-0030
PO BOX 31, MANAHAWKIN, NJ 08050-0031
PO BOX 32, MANAHAWKIN, NJ 08050-0032
PO BOX 33, MANAHAWKIN, NJ 08050-0033
PO BOX 34, MANAHAWKIN, NJ 08050-0034
PO BOX 35, MANAHAWKIN, NJ 08050-0035
PO BOX 36, MANAHAWKIN, NJ 08050-0036
PO BOX 37, MANAHAWKIN, NJ 08050-0037
PO BOX 38, MANAHAWKIN, NJ 08050-0038
PO BOX 39, MANAHAWKIN, NJ 08050-0039
PO BOX 40, MANAHAWKIN, NJ 08050-0040
PO BOX 41, MANAHAWKIN, NJ 08050-0041
PO BOX 42, MANAHAWKIN, NJ 08050-0042
PO BOX 43, MANAHAWKIN, NJ 08050-0043
PO BOX 44, MANAHAWKIN, NJ 08050-0044
PO BOX 45, MANAHAWKIN, NJ 08050-0045
PO BOX 46, MANAHAWKIN, NJ 08050-0046
PO BOX 47, MANAHAWKIN, NJ 08050-0047
PO BOX 48, MANAHAWKIN, NJ 08050-0048
PO BOX 49, MANAHAWKIN, NJ 08050-0049
PO BOX 50, MANAHAWKIN, NJ 08050-0050
PO BOX 51, MANAHAWKIN, NJ 08050-0051
PO BOX 52, MANAHAWKIN, NJ 08050-0052
PO BOX 53, MANAHAWKIN, NJ 08050-0053
PO BOX 54, MANAHAWKIN, NJ 08050-0054
PO BOX 55, MANAHAWKIN, NJ 08050-0055
PO BOX 56, MANAHAWKIN, NJ 08050-0056
PO BOX 57, MANAHAWKIN, NJ 08050-0057
PO BOX 58, MANAHAWKIN, NJ 08050-0058
PO BOX 59, MANAHAWKIN, NJ 08050-0059
PO BOX 60, MANAHAWKIN, NJ 08050-0060
PO BOX 61, MANAHAWKIN, NJ 08050-0061
PO BOX 62, MANAHAWKIN, NJ 08050-0062
PO BOX 63, MANAHAWKIN, NJ 08050-0063
PO BOX 64, MANAHAWKIN, NJ 08050-0064
PO BOX 65, MANAHAWKIN, NJ 08050-0065
PO BOX 66, MANAHAWKIN, NJ 08050-0066
PO BOX 67, MANAHAWKIN, NJ 08050-0067
PO BOX 68, MANAHAWKIN, NJ 08050-0068
PO BOX 69, MANAHAWKIN, NJ 08050-0069
PO BOX 70, MANAHAWKIN, NJ 08050-0070
PO BOX 71, MANAHAWKIN, NJ 08050-0071
PO BOX 72, MANAHAWKIN, NJ 08050-0072
PO BOX 73, MANAHAWKIN, NJ 08050-0073
PO BOX 74, MANAHAWKIN, NJ 08050-0074
PO BOX 75, MANAHAWKIN, NJ 08050-0075
PO BOX 76, MANAHAWKIN, NJ 08050-0076
PO BOX 77, MANAHAWKIN, NJ 08050-0077
PO BOX 78, MANAHAWKIN, NJ 08050-0078
PO BOX 79, MANAHAWKIN, NJ 08050-0079
PO BOX 80, MANAHAWKIN, NJ 08050-0080
PO BOX 81, MANAHAWKIN, NJ 08050-0081
PO BOX 82, MANAHAWKIN, NJ 08050-0082
PO BOX 83, MANAHAWKIN, NJ 08050-0083
PO BOX 84, MANAHAWKIN, NJ 08050-0084
PO BOX 85, MANAHAWKIN, NJ 08050-0085
PO BOX 86, MANAHAWKIN, NJ 08050-0086
PO BOX 87, MANAHAWKIN, NJ 08050-0087
PO BOX 88, MANAHAWKIN, NJ 08050-0088
PO BOX 89, MANAHAWKIN, NJ 08050-0089
PO BOX 90, MANAHAWKIN, NJ 08050-0090
PO BOX 91, MANAHAWKIN, NJ 08050-0091
PO BOX 92, MANAHAWKIN, NJ 08050-0092
PO BOX 93, MANAHAWKIN, NJ 08050-0093
PO BOX 94, MANAHAWKIN, NJ 08050-0094
PO BOX 95, MANAHAWKIN, NJ 08050-0095
PO BOX 96, MANAHAWKIN, NJ 08050-0096
PO BOX 97, MANAHAWKIN, NJ 08050-0097
PO BOX 98, MANAHAWKIN, NJ 08050-0098
PO BOX 99, MANAHAWKIN, NJ 08050-0099
PO BOX 100, MANAHAWKIN, NJ 08050-0100
PO BOX 101, MANAHAWKIN, NJ 08050-0101
PO BOX 102, MANAHAWKIN, NJ 08050-0102
PO BOX 103, MANAHAWKIN, NJ 08050-0103
PO BOX 104, MANAHAWKIN, NJ 08050-0104
PO BOX 105, MANAHAWKIN, NJ 08050-0105
PO BOX 106, MANAHAWKIN, NJ 08050-0106
PO BOX 107, MANAHAWKIN, NJ 08050-0107
PO BOX 108, MANAHAWKIN, NJ 08050-0108
PO BOX 109, MANAHAWKIN, NJ 08050-0109
PO BOX 110, MANAHAWKIN, NJ 08050-0110
PO BOX 111, MANAHAWKIN, NJ 08050-0111
PO BOX 112, MANAHAWKIN, NJ 08050-0112
PO BOX 113, MANAHAWKIN, NJ 08050-0113
PO BOX 114, MANAHAWKIN, NJ 08050-0114
PO BOX 115, MANAHAWKIN, NJ 08050-0115
PO BOX 116, MANAHAWKIN, NJ 08050-0116
PO BOX 117, MANAHAWKIN, NJ 08050-0117
PO BOX 118, MANAHAWKIN, NJ 08050-0118
PO BOX 119, MANAHAWKIN, NJ 08050-0119
PO BOX 120, MANAHAWKIN, NJ 08050-0120
PO BOX 121, MANAHAWKIN, NJ 08050-0121
PO BOX 122, MANAHAWKIN, NJ 08050-0122
PO BOX 123, MANAHAWKIN, NJ 08050-0123
PO BOX 124, MANAHAWKIN, NJ 08050-0124
PO BOX 125, MANAHAWKIN, NJ 08050-0125
PO BOX 126, MANAHAWKIN, NJ 08050-0126
PO BOX 127, MANAHAWKIN, NJ 08050-0127
PO BOX 128, MANAHAWKIN, NJ 08050-0128
PO BOX 129, MANAHAWKIN, NJ 08050-0129
PO BOX 130, MANAHAWKIN, NJ 08050-0130
PO BOX 131, MANAHAWKIN, NJ 08050-0131
PO BOX 132, MANAHAWKIN, NJ 08050-0132
PO BOX 133, MANAHAWKIN, NJ 08050-0133
PO BOX 134, MANAHAWKIN, NJ 08050-0134
PO BOX 135, MANAHAWKIN, NJ 08050-0135
PO BOX 136, MANAHAWKIN, NJ 08050-0136
PO BOX 137, MANAHAWKIN, NJ 08050-0137
PO BOX 138, MANAHAWKIN, NJ 08050-0138
PO BOX 139, MANAHAWKIN, NJ 08050-0139
PO BOX 140, MANAHAWKIN, NJ 08050-0140
PO BOX 141, MANAHAWKIN, NJ 08050-0141
PO BOX 142, MANAHAWKIN, NJ 08050-0142
PO BOX 143, MANAHAWKIN, NJ 08050-0143
PO BOX 144, MANAHAWKIN, NJ 08050-0144
PO BOX 145, MANAHAWKIN, NJ 08050-0145
PO BOX 146, MANAHAWKIN, NJ 08050-0146
PO BOX 147, MANAHAWKIN, NJ 08050-0147
PO BOX 148, MANAHAWKIN, NJ 08050-0148
PO BOX 149, MANAHAWKIN, NJ 08050-0149
PO BOX 150, MANAHAWKIN, NJ 08050-0150
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