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, BRIDGEWATER CORNERS, VT 05035-0001
PO BOX 2, BRIDGEWATER CORNERS, VT 05035-0002
PO BOX 3, BRIDGEWATER CORNERS, VT 05035-0003
PO BOX 4, BRIDGEWATER CORNERS, VT 05035-0004
PO BOX 5, BRIDGEWATER CORNERS, VT 05035-0005
PO BOX 6, BRIDGEWATER CORNERS, VT 05035-0006
PO BOX 7, BRIDGEWATER CORNERS, VT 05035-0007
PO BOX 8, BRIDGEWATER CORNERS, VT 05035-0008
PO BOX 9, BRIDGEWATER CORNERS, VT 05035-0009
PO BOX 10, BRIDGEWATER CORNERS, VT 05035-0010
PO BOX 11, BRIDGEWATER CORNERS, VT 05035-0011
PO BOX 12, BRIDGEWATER CORNERS, VT 05035-0012
PO BOX 13, BRIDGEWATER CORNERS, VT 05035-0013
PO BOX 14, BRIDGEWATER CORNERS, VT 05035-0014
PO BOX 15, BRIDGEWATER CORNERS, VT 05035-0015
PO BOX 16, BRIDGEWATER CORNERS, VT 05035-0016
PO BOX 17, BRIDGEWATER CORNERS, VT 05035-0017
PO BOX 18, BRIDGEWATER CORNERS, VT 05035-0018
PO BOX 19, BRIDGEWATER CORNERS, VT 05035-0019
PO BOX 20, BRIDGEWATER CORNERS, VT 05035-0020
PO BOX 21, BRIDGEWATER CORNERS, VT 05035-0021
PO BOX 22, BRIDGEWATER CORNERS, VT 05035-0022
PO BOX 23, BRIDGEWATER CORNERS, VT 05035-0023
PO BOX 24, BRIDGEWATER CORNERS, VT 05035-0024
PO BOX 25, BRIDGEWATER CORNERS, VT 05035-0025
PO BOX 26, BRIDGEWATER CORNERS, VT 05035-0026
PO BOX 27, BRIDGEWATER CORNERS, VT 05035-0027
PO BOX 28, BRIDGEWATER CORNERS, VT 05035-0028
PO BOX 29, BRIDGEWATER CORNERS, VT 05035-0029
PO BOX 30, BRIDGEWATER CORNERS, VT 05035-0030
PO BOX 31, BRIDGEWATER CORNERS, VT 05035-0031
PO BOX 32, BRIDGEWATER CORNERS, VT 05035-0032
PO BOX 33, BRIDGEWATER CORNERS, VT 05035-0033
PO BOX 34, BRIDGEWATER CORNERS, VT 05035-0034
PO BOX 35, BRIDGEWATER CORNERS, VT 05035-0035
PO BOX 36, BRIDGEWATER CORNERS, VT 05035-0036
PO BOX 37, BRIDGEWATER CORNERS, VT 05035-0037
PO BOX 38, BRIDGEWATER CORNERS, VT 05035-0038
PO BOX 39, BRIDGEWATER CORNERS, VT 05035-0039
PO BOX 40, BRIDGEWATER CORNERS, VT 05035-0040
PO BOX 41, BRIDGEWATER CORNERS, VT 05035-0041
PO BOX 42, BRIDGEWATER CORNERS, VT 05035-0042
PO BOX 43, BRIDGEWATER CORNERS, VT 05035-0043
PO BOX 44, BRIDGEWATER CORNERS, VT 05035-0044
PO BOX 45, BRIDGEWATER CORNERS, VT 05035-0045
PO BOX 46, BRIDGEWATER CORNERS, VT 05035-0046
PO BOX 47, BRIDGEWATER CORNERS, VT 05035-0047
PO BOX 48, BRIDGEWATER CORNERS, VT 05035-0048
PO BOX 49, BRIDGEWATER CORNERS, VT 05035-0049
PO BOX 50, BRIDGEWATER CORNERS, VT 05035-0050
PO BOX 51, BRIDGEWATER CORNERS, VT 05035-0051
PO BOX 52, BRIDGEWATER CORNERS, VT 05035-0052
PO BOX 53, BRIDGEWATER CORNERS, VT 05035-0053
PO BOX 54, BRIDGEWATER CORNERS, VT 05035-0054
PO BOX 55, BRIDGEWATER CORNERS, VT 05035-0055
PO BOX 56, BRIDGEWATER CORNERS, VT 05035-0056
PO BOX 57, BRIDGEWATER CORNERS, VT 05035-0057
PO BOX 58, BRIDGEWATER CORNERS, VT 05035-0058
PO BOX 59, BRIDGEWATER CORNERS, VT 05035-0059
PO BOX 60, BRIDGEWATER CORNERS, VT 05035-0060
PO BOX 61, BRIDGEWATER CORNERS, VT 05035-0061
PO BOX 62, BRIDGEWATER CORNERS, VT 05035-0062
PO BOX 63, BRIDGEWATER CORNERS, VT 05035-0063
PO BOX 64, BRIDGEWATER CORNERS, VT 05035-0064
PO BOX 65, BRIDGEWATER CORNERS, VT 05035-0065
PO BOX 66, BRIDGEWATER CORNERS, VT 05035-0066
PO BOX 67, BRIDGEWATER CORNERS, VT 05035-0067
PO BOX 68, BRIDGEWATER CORNERS, VT 05035-0068
PO BOX 69, BRIDGEWATER CORNERS, VT 05035-0069
PO BOX 70, BRIDGEWATER CORNERS, VT 05035-0070
PO BOX 71, BRIDGEWATER CORNERS, VT 05035-0071
PO BOX 72, BRIDGEWATER CORNERS, VT 05035-0072
PO BOX 73, BRIDGEWATER CORNERS, VT 05035-0073
PO BOX 74, BRIDGEWATER CORNERS, VT 05035-0074
PO BOX 75, BRIDGEWATER CORNERS, VT 05035-0075
PO BOX 76, BRIDGEWATER CORNERS, VT 05035-0076
PO BOX 77, BRIDGEWATER CORNERS, VT 05035-0077
PO BOX 78, BRIDGEWATER CORNERS, VT 05035-0078
PO BOX 79, BRIDGEWATER CORNERS, VT 05035-0079
PO BOX 80, BRIDGEWATER CORNERS, VT 05035-0080
PO BOX 81, BRIDGEWATER CORNERS, VT 05035-0081
PO BOX 82, BRIDGEWATER CORNERS, VT 05035-0082
PO BOX 83, BRIDGEWATER CORNERS, VT 05035-0083
PO BOX 84, BRIDGEWATER CORNERS, VT 05035-0084
PO BOX 85, BRIDGEWATER CORNERS, VT 05035-0085
PO BOX 86, BRIDGEWATER CORNERS, VT 05035-0086
PO BOX 87, BRIDGEWATER CORNERS, VT 05035-0087
PO BOX 88, BRIDGEWATER CORNERS, VT 05035-0088
PO BOX 89, BRIDGEWATER CORNERS, VT 05035-0089
PO BOX 90, BRIDGEWATER CORNERS, VT 05035-0090
PO BOX 91, BRIDGEWATER CORNERS, VT 05035-0091
PO BOX 92, BRIDGEWATER CORNERS, VT 05035-0092
PO BOX 93, BRIDGEWATER CORNERS, VT 05035-0093
PO BOX 94, BRIDGEWATER CORNERS, VT 05035-0094
PO BOX 95, BRIDGEWATER CORNERS, VT 05035-0095
PO BOX 96, BRIDGEWATER CORNERS, VT 05035-0096
PO BOX 97, BRIDGEWATER CORNERS, VT 05035-0097
PO BOX 98, BRIDGEWATER CORNERS, VT 05035-0098
PO BOX 99, BRIDGEWATER CORNERS, VT 05035-0099
PO BOX 100, BRIDGEWATER CORNERS, VT 05035-0100
PO BOX 101, BRIDGEWATER CORNERS, VT 05035-0101
PO BOX 102, BRIDGEWATER CORNERS, VT 05035-0102
PO BOX 103, BRIDGEWATER CORNERS, VT 05035-0103
PO BOX 104, BRIDGEWATER CORNERS, VT 05035-0104
PO BOX 105, BRIDGEWATER CORNERS, VT 05035-0105
PO BOX 106, BRIDGEWATER CORNERS, VT 05035-0106
PO BOX 107, BRIDGEWATER CORNERS, VT 05035-0107
PO BOX 108, BRIDGEWATER CORNERS, VT 05035-0108
PO BOX 109, BRIDGEWATER CORNERS, VT 05035-0109
PO BOX 110, BRIDGEWATER CORNERS, VT 05035-0110
PO BOX 111, BRIDGEWATER CORNERS, VT 05035-0111
PO BOX 112, BRIDGEWATER CORNERS, VT 05035-0112
PO BOX 113, BRIDGEWATER CORNERS, VT 05035-0113
PO BOX 114, BRIDGEWATER CORNERS, VT 05035-0114
PO BOX 115, BRIDGEWATER CORNERS, VT 05035-0115
PO BOX 116, BRIDGEWATER CORNERS, VT 05035-0116
PO BOX 117, BRIDGEWATER CORNERS, VT 05035-0117
PO BOX 118, BRIDGEWATER CORNERS, VT 05035-0118
PO BOX 119, BRIDGEWATER CORNERS, VT 05035-0119
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