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 801, LAKE FOREST, IL 60045-0801
PO BOX 802, LAKE FOREST, IL 60045-0802
PO BOX 803, LAKE FOREST, IL 60045-0803
PO BOX 804, LAKE FOREST, IL 60045-0804
PO BOX 805, LAKE FOREST, IL 60045-0805
PO BOX 806, LAKE FOREST, IL 60045-0806
PO BOX 807, LAKE FOREST, IL 60045-0807
PO BOX 808, LAKE FOREST, IL 60045-0808
PO BOX 809, LAKE FOREST, IL 60045-0809
PO BOX 810, LAKE FOREST, IL 60045-0810
PO BOX 811, LAKE FOREST, IL 60045-0811
PO BOX 812, LAKE FOREST, IL 60045-0812
PO BOX 813, LAKE FOREST, IL 60045-0813
PO BOX 814, LAKE FOREST, IL 60045-0814
PO BOX 815, LAKE FOREST, IL 60045-0815
PO BOX 816, LAKE FOREST, IL 60045-0816
PO BOX 817, LAKE FOREST, IL 60045-0817
PO BOX 818, LAKE FOREST, IL 60045-0818
PO BOX 819, LAKE FOREST, IL 60045-0819
PO BOX 820, LAKE FOREST, IL 60045-0820
PO BOX 821, LAKE FOREST, IL 60045-0821
PO BOX 822, LAKE FOREST, IL 60045-0822
PO BOX 823, LAKE FOREST, IL 60045-0823
PO BOX 824, LAKE FOREST, IL 60045-0824
PO BOX 825, LAKE FOREST, IL 60045-0825
PO BOX 826, LAKE FOREST, IL 60045-0826
PO BOX 827, LAKE FOREST, IL 60045-0827
PO BOX 828, LAKE FOREST, IL 60045-0828
PO BOX 829, LAKE FOREST, IL 60045-0829
PO BOX 830, LAKE FOREST, IL 60045-0830
PO BOX 831, LAKE FOREST, IL 60045-0831
PO BOX 832, LAKE FOREST, IL 60045-0832
PO BOX 833, LAKE FOREST, IL 60045-0833
PO BOX 834, LAKE FOREST, IL 60045-0834
PO BOX 835, LAKE FOREST, IL 60045-0835
PO BOX 836, LAKE FOREST, IL 60045-0836
PO BOX 837, LAKE FOREST, IL 60045-0837
PO BOX 838, LAKE FOREST, IL 60045-0838
PO BOX 839, LAKE FOREST, IL 60045-0839
PO BOX 840, LAKE FOREST, IL 60045-0840
PO BOX 841, LAKE FOREST, IL 60045-0841
PO BOX 842, LAKE FOREST, IL 60045-0842
PO BOX 843, LAKE FOREST, IL 60045-0843
PO BOX 844, LAKE FOREST, IL 60045-0844
PO BOX 845, LAKE FOREST, IL 60045-0845
PO BOX 846, LAKE FOREST, IL 60045-0846
PO BOX 847, LAKE FOREST, IL 60045-0847
PO BOX 848, LAKE FOREST, IL 60045-0848
PO BOX 849, LAKE FOREST, IL 60045-0849
PO BOX 850, LAKE FOREST, IL 60045-0850
PO BOX 851, LAKE FOREST, IL 60045-0851
PO BOX 852, LAKE FOREST, IL 60045-0852
PO BOX 853, LAKE FOREST, IL 60045-0853
PO BOX 854, LAKE FOREST, IL 60045-0854
PO BOX 855, LAKE FOREST, IL 60045-0855
PO BOX 856, LAKE FOREST, IL 60045-0856
PO BOX 857, LAKE FOREST, IL 60045-0857
PO BOX 858, LAKE FOREST, IL 60045-0858
PO BOX 859, LAKE FOREST, IL 60045-0859
PO BOX 860, LAKE FOREST, IL 60045-0860
PO BOX 861, LAKE FOREST, IL 60045-0861
PO BOX 862, LAKE FOREST, IL 60045-0862
PO BOX 863, LAKE FOREST, IL 60045-0863
PO BOX 864, LAKE FOREST, IL 60045-0864
PO BOX 865, LAKE FOREST, IL 60045-0865
PO BOX 866, LAKE FOREST, IL 60045-0866
PO BOX 867, LAKE FOREST, IL 60045-0867
PO BOX 868, LAKE FOREST, IL 60045-0868
PO BOX 869, LAKE FOREST, IL 60045-0869
PO BOX 870, LAKE FOREST, IL 60045-0870
PO BOX 871, LAKE FOREST, IL 60045-0871
PO BOX 872, LAKE FOREST, IL 60045-0872
PO BOX 873, LAKE FOREST, IL 60045-0873
PO BOX 874, LAKE FOREST, IL 60045-0874
PO BOX 875, LAKE FOREST, IL 60045-0875
PO BOX 876, LAKE FOREST, IL 60045-0876
PO BOX 877, LAKE FOREST, IL 60045-0877
PO BOX 878, LAKE FOREST, IL 60045-0878
PO BOX 879, LAKE FOREST, IL 60045-0879
PO BOX 880, LAKE FOREST, IL 60045-0880
PO BOX 881, LAKE FOREST, IL 60045-0881
PO BOX 882, LAKE FOREST, IL 60045-0882
PO BOX 883, LAKE FOREST, IL 60045-0883
PO BOX 884, LAKE FOREST, IL 60045-0884
PO BOX 885, LAKE FOREST, IL 60045-0885
PO BOX 886, LAKE FOREST, IL 60045-0886
PO BOX 887, LAKE FOREST, IL 60045-0887
PO BOX 888, LAKE FOREST, IL 60045-0888
PO BOX 889, LAKE FOREST, IL 60045-0889
PO BOX 890, LAKE FOREST, IL 60045-0890
PO BOX 891, LAKE FOREST, IL 60045-0891
PO BOX 892, LAKE FOREST, IL 60045-0892
PO BOX 893, LAKE FOREST, IL 60045-0893
PO BOX 894, LAKE FOREST, IL 60045-0894
PO BOX 895, LAKE FOREST, IL 60045-0895
PO BOX 896, LAKE FOREST, IL 60045-0896
PO BOX 897, LAKE FOREST, IL 60045-0897
PO BOX 898, LAKE FOREST, IL 60045-0898
PO BOX 899, LAKE FOREST, IL 60045-0899
PO BOX 900, LAKE FOREST, IL 60045-0900
PO BOX 901, LAKE FOREST, IL 60045-0901
PO BOX 902, LAKE FOREST, IL 60045-0902
PO BOX 903, LAKE FOREST, IL 60045-0903
PO BOX 904, LAKE FOREST, IL 60045-0904
PO BOX 905, LAKE FOREST, IL 60045-0905
PO BOX 906, LAKE FOREST, IL 60045-0906
PO BOX 907, LAKE FOREST, IL 60045-0907
PO BOX 908, LAKE FOREST, IL 60045-0908
PO BOX 909, LAKE FOREST, IL 60045-0909
PO BOX 910, LAKE FOREST, IL 60045-0910
PO BOX 911, LAKE FOREST, IL 60045-0911
PO BOX 912, LAKE FOREST, IL 60045-0912
PO BOX 913, LAKE FOREST, IL 60045-0913
PO BOX 914, LAKE FOREST, IL 60045-0914
PO BOX 915, LAKE FOREST, IL 60045-0915
PO BOX 916, LAKE FOREST, IL 60045-0916
PO BOX 917, LAKE FOREST, IL 60045-0917
PO BOX 918, LAKE FOREST, IL 60045-0918
PO BOX 919, LAKE FOREST, IL 60045-0919
PO BOX 920, LAKE FOREST, IL 60045-0920
PO BOX 921, LAKE FOREST, IL 60045-0921
PO BOX 922, LAKE FOREST, IL 60045-0922
PO BOX 923, LAKE FOREST, IL 60045-0923
PO BOX 924, LAKE FOREST, IL 60045-0924
PO BOX 925, LAKE FOREST, IL 60045-0925
PO BOX 926, LAKE FOREST, IL 60045-0926
PO BOX 927, LAKE FOREST, IL 60045-0927
PO BOX 928, LAKE FOREST, IL 60045-0928
PO BOX 929, LAKE FOREST, IL 60045-0929
PO BOX 930, LAKE FOREST, IL 60045-0930
PO BOX 931, LAKE FOREST, IL 60045-0931
PO BOX 932, LAKE FOREST, IL 60045-0932
PO BOX 933, LAKE FOREST, IL 60045-0933
PO BOX 934, LAKE FOREST, IL 60045-0934
PO BOX 935, LAKE FOREST, IL 60045-0935
PO BOX 936, LAKE FOREST, IL 60045-0936
PO BOX 937, LAKE FOREST, IL 60045-0937
PO BOX 938, LAKE FOREST, IL 60045-0938
PO BOX 939, LAKE FOREST, IL 60045-0939
PO BOX 940, LAKE FOREST, IL 60045-0940
PO BOX 941, LAKE FOREST, IL 60045-0941
PO BOX 942, LAKE FOREST, IL 60045-0942
PO BOX 943, LAKE FOREST, IL 60045-0943
PO BOX 944, LAKE FOREST, IL 60045-0944
PO BOX 945, LAKE FOREST, IL 60045-0945
PO BOX 946, LAKE FOREST, IL 60045-0946
PO BOX 947, LAKE FOREST, IL 60045-0947
PO BOX 948, LAKE FOREST, IL 60045-0948
PO BOX 949, LAKE FOREST, IL 60045-0949
PO BOX 950, LAKE FOREST, IL 60045-0950
PO BOX 951, LAKE FOREST, IL 60045-0951
PO BOX 952, LAKE FOREST, IL 60045-0952
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