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 21, PONTE VEDRA BEACH, FL 32004-0021
PO BOX 22, PONTE VEDRA BEACH, FL 32004-0022
PO BOX 23, PONTE VEDRA BEACH, FL 32004-0023
PO BOX 24, PONTE VEDRA BEACH, FL 32004-0024
PO BOX 25, PONTE VEDRA BEACH, FL 32004-0025
PO BOX 26, PONTE VEDRA BEACH, FL 32004-0026
PO BOX 27, PONTE VEDRA BEACH, FL 32004-0027
PO BOX 28, PONTE VEDRA BEACH, FL 32004-0028
PO BOX 29, PONTE VEDRA BEACH, FL 32004-0029
PO BOX 30, PONTE VEDRA BEACH, FL 32004-0030
PO BOX 31, PONTE VEDRA BEACH, FL 32004-0031
PO BOX 32, PONTE VEDRA BEACH, FL 32004-0032
PO BOX 33, PONTE VEDRA BEACH, FL 32004-0033
PO BOX 34, PONTE VEDRA BEACH, FL 32004-0034
PO BOX 35, PONTE VEDRA BEACH, FL 32004-0035
PO BOX 36, PONTE VEDRA BEACH, FL 32004-0036
PO BOX 37, PONTE VEDRA BEACH, FL 32004-0037
PO BOX 38, PONTE VEDRA BEACH, FL 32004-0038
PO BOX 39, PONTE VEDRA BEACH, FL 32004-0039
PO BOX 40, PONTE VEDRA BEACH, FL 32004-0040
PO BOX 41, PONTE VEDRA BEACH, FL 32004-0041
PO BOX 42, PONTE VEDRA BEACH, FL 32004-0042
PO BOX 43, PONTE VEDRA BEACH, FL 32004-0043
PO BOX 44, PONTE VEDRA BEACH, FL 32004-0044
PO BOX 45, PONTE VEDRA BEACH, FL 32004-0045
PO BOX 46, PONTE VEDRA BEACH, FL 32004-0046
PO BOX 47, PONTE VEDRA BEACH, FL 32004-0047
PO BOX 48, PONTE VEDRA BEACH, FL 32004-0048
PO BOX 49, PONTE VEDRA BEACH, FL 32004-0049
PO BOX 50, PONTE VEDRA BEACH, FL 32004-0050
PO BOX 51, PONTE VEDRA BEACH, FL 32004-0051
PO BOX 52, PONTE VEDRA BEACH, FL 32004-0052
PO BOX 53, PONTE VEDRA BEACH, FL 32004-0053
PO BOX 54, PONTE VEDRA BEACH, FL 32004-0054
PO BOX 55, PONTE VEDRA BEACH, FL 32004-0055
PO BOX 56, PONTE VEDRA BEACH, FL 32004-0056
PO BOX 57, PONTE VEDRA BEACH, FL 32004-0057
PO BOX 58, PONTE VEDRA BEACH, FL 32004-0058
PO BOX 59, PONTE VEDRA BEACH, FL 32004-0059
PO BOX 60, PONTE VEDRA BEACH, FL 32004-0060
PO BOX 61, PONTE VEDRA BEACH, FL 32004-0061
PO BOX 62, PONTE VEDRA BEACH, FL 32004-0062
PO BOX 63, PONTE VEDRA BEACH, FL 32004-0063
PO BOX 64, PONTE VEDRA BEACH, FL 32004-0064
PO BOX 65, PONTE VEDRA BEACH, FL 32004-0065
PO BOX 66, PONTE VEDRA BEACH, FL 32004-0066
PO BOX 67, PONTE VEDRA BEACH, FL 32004-0067
PO BOX 68, PONTE VEDRA BEACH, FL 32004-0068
PO BOX 69, PONTE VEDRA BEACH, FL 32004-0069
PO BOX 70, PONTE VEDRA BEACH, FL 32004-0070
PO BOX 71, PONTE VEDRA BEACH, FL 32004-0071
PO BOX 72, PONTE VEDRA BEACH, FL 32004-0072
PO BOX 73, PONTE VEDRA BEACH, FL 32004-0073
PO BOX 74, PONTE VEDRA BEACH, FL 32004-0074
PO BOX 75, PONTE VEDRA BEACH, FL 32004-0075
PO BOX 76, PONTE VEDRA BEACH, FL 32004-0076
PO BOX 77, PONTE VEDRA BEACH, FL 32004-0077
PO BOX 78, PONTE VEDRA BEACH, FL 32004-0078
PO BOX 79, PONTE VEDRA BEACH, FL 32004-0079
PO BOX 80, PONTE VEDRA BEACH, FL 32004-0080
PO BOX 81, PONTE VEDRA BEACH, FL 32004-0081
PO BOX 82, PONTE VEDRA BEACH, FL 32004-0082
PO BOX 83, PONTE VEDRA BEACH, FL 32004-0083
PO BOX 84, PONTE VEDRA BEACH, FL 32004-0084
PO BOX 85, PONTE VEDRA BEACH, FL 32004-0085
PO BOX 86, PONTE VEDRA BEACH, FL 32004-0086
PO BOX 87, PONTE VEDRA BEACH, FL 32004-0087
PO BOX 88, PONTE VEDRA BEACH, FL 32004-0088
PO BOX 89, PONTE VEDRA BEACH, FL 32004-0089
PO BOX 90, PONTE VEDRA BEACH, FL 32004-0090
PO BOX 91, PONTE VEDRA BEACH, FL 32004-0091
PO BOX 92, PONTE VEDRA BEACH, FL 32004-0092
PO BOX 93, PONTE VEDRA BEACH, FL 32004-0093
PO BOX 94, PONTE VEDRA BEACH, FL 32004-0094
PO BOX 95, PONTE VEDRA BEACH, FL 32004-0095
PO BOX 96, PONTE VEDRA BEACH, FL 32004-0096
PO BOX 97, PONTE VEDRA BEACH, FL 32004-0097
PO BOX 98, PONTE VEDRA BEACH, FL 32004-0098
PO BOX 99, PONTE VEDRA BEACH, FL 32004-0099
PO BOX 100, PONTE VEDRA BEACH, FL 32004-0100
PO BOX 101, PONTE VEDRA BEACH, FL 32004-0101
PO BOX 102, PONTE VEDRA BEACH, FL 32004-0102
PO BOX 103, PONTE VEDRA BEACH, FL 32004-0103
PO BOX 104, PONTE VEDRA BEACH, FL 32004-0104
PO BOX 105, PONTE VEDRA BEACH, FL 32004-0105
PO BOX 106, PONTE VEDRA BEACH, FL 32004-0106
PO BOX 107, PONTE VEDRA BEACH, FL 32004-0107
PO BOX 108, PONTE VEDRA BEACH, FL 32004-0108
PO BOX 109, PONTE VEDRA BEACH, FL 32004-0109
PO BOX 110, PONTE VEDRA BEACH, FL 32004-0110
PO BOX 111, PONTE VEDRA BEACH, FL 32004-0111
PO BOX 112, PONTE VEDRA BEACH, FL 32004-0112
PO BOX 113, PONTE VEDRA BEACH, FL 32004-0113
PO BOX 114, PONTE VEDRA BEACH, FL 32004-0114
PO BOX 115, PONTE VEDRA BEACH, FL 32004-0115
PO BOX 116, PONTE VEDRA BEACH, FL 32004-0116
PO BOX 117, PONTE VEDRA BEACH, FL 32004-0117
PO BOX 118, PONTE VEDRA BEACH, FL 32004-0118
PO BOX 119, PONTE VEDRA BEACH, FL 32004-0119
PO BOX 120, PONTE VEDRA BEACH, FL 32004-0120
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