A PO BOX number can be less than or more than four digit. For post office boxes, the general rule is that each box has its own ZIP+4 code.
The last four digit is often one of the following:
1. Zero plus the last three digits of the box number (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. The last four digits of the box number (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. If the box number is less than four digits, enough zeros prepended to the front of the box number to produce a four-digit number(eg. PO BOX 1, Shreveport LA 71161-0001).
However, there is no uniform rule, the zip code plus four is for reference only, the ZIP+4 code must be looked up individually for each box in the USPS offical website.
PO BOX 433600, SAN YSIDRO, CA 92143-3600
PO BOX 433601, SAN YSIDRO, CA 92143-3601
PO BOX 433602, SAN YSIDRO, CA 92143-3602
PO BOX 433603, SAN YSIDRO, CA 92143-3603
PO BOX 433604, SAN YSIDRO, CA 92143-3604
PO BOX 433605, SAN YSIDRO, CA 92143-3605
PO BOX 433606, SAN YSIDRO, CA 92143-3606
PO BOX 433607, SAN YSIDRO, CA 92143-3607
PO BOX 433608, SAN YSIDRO, CA 92143-3608
PO BOX 433609, SAN YSIDRO, CA 92143-3609
PO BOX 433610, SAN YSIDRO, CA 92143-3610
PO BOX 433611, SAN YSIDRO, CA 92143-3611
PO BOX 433612, SAN YSIDRO, CA 92143-3612
PO BOX 433613, SAN YSIDRO, CA 92143-3613
PO BOX 433614, SAN YSIDRO, CA 92143-3614
PO BOX 433615, SAN YSIDRO, CA 92143-3615
PO BOX 433616, SAN YSIDRO, CA 92143-3616
PO BOX 433617, SAN YSIDRO, CA 92143-3617
PO BOX 433618, SAN YSIDRO, CA 92143-3618
PO BOX 433619, SAN YSIDRO, CA 92143-3619
PO BOX 433620, SAN YSIDRO, CA 92143-3620
PO BOX 433621, SAN YSIDRO, CA 92143-3621
PO BOX 433622, SAN YSIDRO, CA 92143-3622
PO BOX 433623, SAN YSIDRO, CA 92143-3623
PO BOX 433624, SAN YSIDRO, CA 92143-3624
PO BOX 433625, SAN YSIDRO, CA 92143-3625
PO BOX 433626, SAN YSIDRO, CA 92143-3626
PO BOX 433627, SAN YSIDRO, CA 92143-3627
PO BOX 433628, SAN YSIDRO, CA 92143-3628
PO BOX 433629, SAN YSIDRO, CA 92143-3629
PO BOX 433630, SAN YSIDRO, CA 92143-3630
PO BOX 433631, SAN YSIDRO, CA 92143-3631
PO BOX 433632, SAN YSIDRO, CA 92143-3632
PO BOX 433633, SAN YSIDRO, CA 92143-3633
PO BOX 433634, SAN YSIDRO, CA 92143-3634
PO BOX 433635, SAN YSIDRO, CA 92143-3635
PO BOX 433636, SAN YSIDRO, CA 92143-3636
PO BOX 433637, SAN YSIDRO, CA 92143-3637
PO BOX 433638, SAN YSIDRO, CA 92143-3638
PO BOX 433639, SAN YSIDRO, CA 92143-3639
PO BOX 433640, SAN YSIDRO, CA 92143-3640
PO BOX 433641, SAN YSIDRO, CA 92143-3641
PO BOX 433642, SAN YSIDRO, CA 92143-3642
PO BOX 433643, SAN YSIDRO, CA 92143-3643
PO BOX 433644, SAN YSIDRO, CA 92143-3644
PO BOX 433645, SAN YSIDRO, CA 92143-3645
PO BOX 433646, SAN YSIDRO, CA 92143-3646
PO BOX 433647, SAN YSIDRO, CA 92143-3647
PO BOX 433648, SAN YSIDRO, CA 92143-3648
PO BOX 433649, SAN YSIDRO, CA 92143-3649
PO BOX 433650, SAN YSIDRO, CA 92143-3650
PO BOX 433651, SAN YSIDRO, CA 92143-3651
PO BOX 433652, SAN YSIDRO, CA 92143-3652
PO BOX 433653, SAN YSIDRO, CA 92143-3653
PO BOX 433654, SAN YSIDRO, CA 92143-3654
PO BOX 433655, SAN YSIDRO, CA 92143-3655
PO BOX 433656, SAN YSIDRO, CA 92143-3656
PO BOX 433657, SAN YSIDRO, CA 92143-3657
PO BOX 433658, SAN YSIDRO, CA 92143-3658
PO BOX 433659, SAN YSIDRO, CA 92143-3659
PO BOX 433660, SAN YSIDRO, CA 92143-3660
PO BOX 433661, SAN YSIDRO, CA 92143-3661
PO BOX 433662, SAN YSIDRO, CA 92143-3662
PO BOX 433663, SAN YSIDRO, CA 92143-3663
PO BOX 433664, SAN YSIDRO, CA 92143-3664
PO BOX 433665, SAN YSIDRO, CA 92143-3665
PO BOX 433666, SAN YSIDRO, CA 92143-3666
PO BOX 433667, SAN YSIDRO, CA 92143-3667
PO BOX 433668, SAN YSIDRO, CA 92143-3668
PO BOX 433669, SAN YSIDRO, CA 92143-3669
PO BOX 433670, SAN YSIDRO, CA 92143-3670
PO BOX 433671, SAN YSIDRO, CA 92143-3671
PO BOX 433672, SAN YSIDRO, CA 92143-3672
PO BOX 433673, SAN YSIDRO, CA 92143-3673
PO BOX 433674, SAN YSIDRO, CA 92143-3674
PO BOX 433675, SAN YSIDRO, CA 92143-3675
PO BOX 433676, SAN YSIDRO, CA 92143-3676
PO BOX 433677, SAN YSIDRO, CA 92143-3677
PO BOX 433678, SAN YSIDRO, CA 92143-3678
PO BOX 433679, SAN YSIDRO, CA 92143-3679
PO BOX 433680, SAN YSIDRO, CA 92143-3680
PO BOX 433681, SAN YSIDRO, CA 92143-3681
PO BOX 433682, SAN YSIDRO, CA 92143-3682
PO BOX 433683, SAN YSIDRO, CA 92143-3683
PO BOX 433684, SAN YSIDRO, CA 92143-3684
PO BOX 433685, SAN YSIDRO, CA 92143-3685
PO BOX 433686, SAN YSIDRO, CA 92143-3686
PO BOX 433687, SAN YSIDRO, CA 92143-3687
PO BOX 433688, SAN YSIDRO, CA 92143-3688
PO BOX 433689, SAN YSIDRO, CA 92143-3689
PO BOX 433690, SAN YSIDRO, CA 92143-3690
PO BOX 433691, SAN YSIDRO, CA 92143-3691
PO BOX 433692, SAN YSIDRO, CA 92143-3692
PO BOX 433693, SAN YSIDRO, CA 92143-3693
PO BOX 433694, SAN YSIDRO, CA 92143-3694
PO BOX 433695, SAN YSIDRO, CA 92143-3695
PO BOX 433696, SAN YSIDRO, CA 92143-3696
PO BOX 433697, SAN YSIDRO, CA 92143-3697
PO BOX 433698, SAN YSIDRO, CA 92143-3698
PO BOX 433699, SAN YSIDRO, CA 92143-3699
PO BOX 433700, SAN YSIDRO, CA 92143-3700
PO BOX 433701, SAN YSIDRO, CA 92143-3701
PO BOX 433702, SAN YSIDRO, CA 92143-3702
PO BOX 433703, SAN YSIDRO, CA 92143-3703
PO BOX 433704, SAN YSIDRO, CA 92143-3704
PO BOX 433705, SAN YSIDRO, CA 92143-3705
PO BOX 433706, SAN YSIDRO, CA 92143-3706
PO BOX 433707, SAN YSIDRO, CA 92143-3707
PO BOX 433708, SAN YSIDRO, CA 92143-3708
PO BOX 433709, SAN YSIDRO, CA 92143-3709
PO BOX 433710, SAN YSIDRO, CA 92143-3710
PO BOX 433711, SAN YSIDRO, CA 92143-3711
PO BOX 433712, SAN YSIDRO, CA 92143-3712
PO BOX 433713, SAN YSIDRO, CA 92143-3713
PO BOX 433714, SAN YSIDRO, CA 92143-3714
PO BOX 433715, SAN YSIDRO, CA 92143-3715
PO BOX 433716, SAN YSIDRO, CA 92143-3716
PO BOX 433717, SAN YSIDRO, CA 92143-3717
PO BOX 433718, SAN YSIDRO, CA 92143-3718
PO BOX 433719, SAN YSIDRO, CA 92143-3719
PO BOX 433720, SAN YSIDRO, CA 92143-3720
PO BOX 433721, SAN YSIDRO, CA 92143-3721
PO BOX 433722, SAN YSIDRO, CA 92143-3722
PO BOX 433723, SAN YSIDRO, CA 92143-3723
PO BOX 433724, SAN YSIDRO, CA 92143-3724
PO BOX 433725, SAN YSIDRO, CA 92143-3725
PO BOX 433726, SAN YSIDRO, CA 92143-3726
PO BOX 433727, SAN YSIDRO, CA 92143-3727
PO BOX 433728, SAN YSIDRO, CA 92143-3728
PO BOX 433729, SAN YSIDRO, CA 92143-3729
PO BOX 433730, SAN YSIDRO, CA 92143-3730
PO BOX 433731, SAN YSIDRO, CA 92143-3731
PO BOX 433732, SAN YSIDRO, CA 92143-3732
PO BOX 433733, SAN YSIDRO, CA 92143-3733
PO BOX 433734, SAN YSIDRO, CA 92143-3734
PO BOX 433735, SAN YSIDRO, CA 92143-3735
PO BOX 433736, SAN YSIDRO, CA 92143-3736
PO BOX 433737, SAN YSIDRO, CA 92143-3737
PO BOX 433738, SAN YSIDRO, CA 92143-3738
PO BOX 433739, SAN YSIDRO, CA 92143-3739
PO BOX 433740, SAN YSIDRO, CA 92143-3740
PO BOX 433741, SAN YSIDRO, CA 92143-3741
PO BOX 433742, SAN YSIDRO, CA 92143-3742
PO BOX 433743, SAN YSIDRO, CA 92143-3743
PO BOX 433744, SAN YSIDRO, CA 92143-3744
PO BOX 433745, SAN YSIDRO, CA 92143-3745
PO BOX 433746, SAN YSIDRO, CA 92143-3746
PO BOX 433747, SAN YSIDRO, CA 92143-3747
PO BOX 433748, SAN YSIDRO, CA 92143-3748
PO BOX 433749, SAN YSIDRO, CA 92143-3749
PO BOX 433750, SAN YSIDRO, CA 92143-3750
PO BOX 433751, SAN YSIDRO, CA 92143-3751
PO BOX 433752, SAN YSIDRO, CA 92143-3752
PO BOX 433753, SAN YSIDRO, CA 92143-3753
PO BOX 433754, SAN YSIDRO, CA 92143-3754
PO BOX 433755, SAN YSIDRO, CA 92143-3755
PO BOX 433756, SAN YSIDRO, CA 92143-3756
PO BOX 433757, SAN YSIDRO, CA 92143-3757
PO BOX 433758, SAN YSIDRO, CA 92143-3758
PO BOX 433759, SAN YSIDRO, CA 92143-3759
PO BOX 433760, SAN YSIDRO, CA 92143-3760
PO BOX 433761, SAN YSIDRO, CA 92143-3761
PO BOX 433762, SAN YSIDRO, CA 92143-3762
PO BOX 433763, SAN YSIDRO, CA 92143-3763
PO BOX 433764, SAN YSIDRO, CA 92143-3764
PO BOX 433765, SAN YSIDRO, CA 92143-3765
PO BOX 433766, SAN YSIDRO, CA 92143-3766
PO BOX 433767, SAN YSIDRO, CA 92143-3767
PO BOX 433768, SAN YSIDRO, CA 92143-3768
PO BOX 433769, SAN YSIDRO, CA 92143-3769
PO BOX 433770, SAN YSIDRO, CA 92143-3770
PO BOX 433771, SAN YSIDRO, CA 92143-3771
PO BOX 433772, SAN YSIDRO, CA 92143-3772
PO BOX 433773, SAN YSIDRO, CA 92143-3773
PO BOX 433774, SAN YSIDRO, CA 92143-3774
PO BOX 433775, SAN YSIDRO, CA 92143-3775
PO BOX 433776, SAN YSIDRO, CA 92143-3776
PO BOX 433777, SAN YSIDRO, CA 92143-3777
PO BOX 433778, SAN YSIDRO, CA 92143-3778
PO BOX 433779, SAN YSIDRO, CA 92143-3779
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