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 7751, SAN JUAN, PR 00916-7751
PO BOX 7752, SAN JUAN, PR 00916-7752
PO BOX 7753, SAN JUAN, PR 00916-7753
PO BOX 7754, SAN JUAN, PR 00916-7754
PO BOX 7755, SAN JUAN, PR 00916-7755
PO BOX 7756, SAN JUAN, PR 00916-7756
PO BOX 7757, SAN JUAN, PR 00916-7757
PO BOX 7758, SAN JUAN, PR 00916-7758
PO BOX 7759, SAN JUAN, PR 00916-7759
PO BOX 7760, SAN JUAN, PR 00916-7760
PO BOX 7761, SAN JUAN, PR 00916-7761
PO BOX 7762, SAN JUAN, PR 00916-7762
PO BOX 7763, SAN JUAN, PR 00916-7763
PO BOX 7764, SAN JUAN, PR 00916-7764
PO BOX 7765, SAN JUAN, PR 00916-7765
PO BOX 7766, SAN JUAN, PR 00916-7766
PO BOX 7767, SAN JUAN, PR 00916-7767
PO BOX 7768, SAN JUAN, PR 00916-7768
PO BOX 7769, SAN JUAN, PR 00916-7769
PO BOX 7770, SAN JUAN, PR 00916-7770
PO BOX 7771, SAN JUAN, PR 00916-7771
PO BOX 7772, SAN JUAN, PR 00916-7772
PO BOX 7773, SAN JUAN, PR 00916-7773
PO BOX 7774, SAN JUAN, PR 00916-7774
PO BOX 7775, SAN JUAN, PR 00916-7775
PO BOX 7776, SAN JUAN, PR 00916-7776
PO BOX 7777, SAN JUAN, PR 00916-7777
PO BOX 7778, SAN JUAN, PR 00916-7778
PO BOX 7779, SAN JUAN, PR 00916-7779
PO BOX 7780, SAN JUAN, PR 00916-7780
PO BOX 7781, SAN JUAN, PR 00916-7781
PO BOX 7782, SAN JUAN, PR 00916-7782
PO BOX 7783, SAN JUAN, PR 00916-7783
PO BOX 7784, SAN JUAN, PR 00916-7784
PO BOX 7785, SAN JUAN, PR 00916-7785
PO BOX 7786, SAN JUAN, PR 00916-7786
PO BOX 7787, SAN JUAN, PR 00916-7787
PO BOX 7788, SAN JUAN, PR 00916-7788
PO BOX 7789, SAN JUAN, PR 00916-7789
PO BOX 7790, SAN JUAN, PR 00916-7790
PO BOX 7791, SAN JUAN, PR 00916-7791
PO BOX 7792, SAN JUAN, PR 00916-7792
PO BOX 7793, SAN JUAN, PR 00916-7793
PO BOX 7794, SAN JUAN, PR 00916-7794
PO BOX 7795, SAN JUAN, PR 00916-7795
PO BOX 7796, SAN JUAN, PR 00916-7796
PO BOX 7797, SAN JUAN, PR 00916-7797
PO BOX 7798, SAN JUAN, PR 00916-7798
PO BOX 7799, SAN JUAN, PR 00916-7799
PO BOX 7800, SAN JUAN, PR 00916-7800
PO BOX 7801, SAN JUAN, PR 00916-7801
PO BOX 7802, SAN JUAN, PR 00916-7802
PO BOX 7803, SAN JUAN, PR 00916-7803
PO BOX 7804, SAN JUAN, PR 00916-7804
PO BOX 7805, SAN JUAN, PR 00916-7805
PO BOX 7806, SAN JUAN, PR 00916-7806
PO BOX 7807, SAN JUAN, PR 00916-7807
PO BOX 7808, SAN JUAN, PR 00916-7808
PO BOX 7809, SAN JUAN, PR 00916-7809
PO BOX 7810, SAN JUAN, PR 00916-7810
PO BOX 7811, SAN JUAN, PR 00916-7811
PO BOX 7812, SAN JUAN, PR 00916-7812
PO BOX 7813, SAN JUAN, PR 00916-7813
PO BOX 7814, SAN JUAN, PR 00916-7814
PO BOX 7815, SAN JUAN, PR 00916-7815
PO BOX 7816, SAN JUAN, PR 00916-7816
PO BOX 7817, SAN JUAN, PR 00916-7817
PO BOX 7818, SAN JUAN, PR 00916-7818
PO BOX 7819, SAN JUAN, PR 00916-7819
PO BOX 7820, SAN JUAN, PR 00916-7820
PO BOX 7821, SAN JUAN, PR 00916-7821
PO BOX 7822, SAN JUAN, PR 00916-7822
PO BOX 7823, SAN JUAN, PR 00916-7823
PO BOX 7824, SAN JUAN, PR 00916-7824
PO BOX 7825, SAN JUAN, PR 00916-7825
PO BOX 7826, SAN JUAN, PR 00916-7826
PO BOX 7827, SAN JUAN, PR 00916-7827
PO BOX 7828, SAN JUAN, PR 00916-7828
PO BOX 7829, SAN JUAN, PR 00916-7829
PO BOX 7830, SAN JUAN, PR 00916-7830
PO BOX 7831, SAN JUAN, PR 00916-7831
PO BOX 7832, SAN JUAN, PR 00916-7832
PO BOX 7833, SAN JUAN, PR 00916-7833
PO BOX 7834, SAN JUAN, PR 00916-7834
PO BOX 7835, SAN JUAN, PR 00916-7835
PO BOX 7836, SAN JUAN, PR 00916-7836
PO BOX 7837, SAN JUAN, PR 00916-7837
PO BOX 7838, SAN JUAN, PR 00916-7838
PO BOX 7839, SAN JUAN, PR 00916-7839
PO BOX 7840, SAN JUAN, PR 00916-7840
PO BOX 7841, SAN JUAN, PR 00916-7841
PO BOX 7842, SAN JUAN, PR 00916-7842
PO BOX 7843, SAN JUAN, PR 00916-7843
PO BOX 7844, SAN JUAN, PR 00916-7844
PO BOX 7845, SAN JUAN, PR 00916-7845
PO BOX 7846, SAN JUAN, PR 00916-7846
PO BOX 7847, SAN JUAN, PR 00916-7847
PO BOX 7848, SAN JUAN, PR 00916-7848
PO BOX 7849, SAN JUAN, PR 00916-7849
PO BOX 7850, SAN JUAN, PR 00916-7850
PO BOX 7851, SAN JUAN, PR 00916-7851
PO BOX 7852, SAN JUAN, PR 00916-7852
PO BOX 7853, SAN JUAN, PR 00916-7853
PO BOX 7854, SAN JUAN, PR 00916-7854
PO BOX 7855, SAN JUAN, PR 00916-7855
PO BOX 7856, SAN JUAN, PR 00916-7856
PO BOX 7857, SAN JUAN, PR 00916-7857
PO BOX 7858, SAN JUAN, PR 00916-7858
PO BOX 7859, SAN JUAN, PR 00916-7859
PO BOX 7860, SAN JUAN, PR 00916-7860
PO BOX 7861, SAN JUAN, PR 00916-7861
PO BOX 7862, SAN JUAN, PR 00916-7862
PO BOX 7863, SAN JUAN, PR 00916-7863
PO BOX 7864, SAN JUAN, PR 00916-7864
PO BOX 7865, SAN JUAN, PR 00916-7865
PO BOX 7866, SAN JUAN, PR 00916-7866
PO BOX 7867, SAN JUAN, PR 00916-7867
PO BOX 7868, SAN JUAN, PR 00916-7868
PO BOX 7869, SAN JUAN, PR 00916-7869
PO BOX 7870, SAN JUAN, PR 00916-7870
PO BOX 7871, SAN JUAN, PR 00916-7871
PO BOX 7872, SAN JUAN, PR 00916-7872
PO BOX 7873, SAN JUAN, PR 00916-7873
PO BOX 7874, SAN JUAN, PR 00916-7874
PO BOX 7875, SAN JUAN, PR 00916-7875
PO BOX 7876, SAN JUAN, PR 00916-7876
PO BOX 7877, SAN JUAN, PR 00916-7877
PO BOX 7878, SAN JUAN, PR 00916-7878
PO BOX 7879, SAN JUAN, PR 00916-7879
PO BOX 7880, SAN JUAN, PR 00916-7880
PO BOX 7881, SAN JUAN, PR 00916-7881
PO BOX 7882, SAN JUAN, PR 00916-7882
PO BOX 7883, SAN JUAN, PR 00916-7883
PO BOX 7884, SAN JUAN, PR 00916-7884
PO BOX 7885, SAN JUAN, PR 00916-7885
PO BOX 7886, SAN JUAN, PR 00916-7886
PO BOX 7887, SAN JUAN, PR 00916-7887
PO BOX 7888, SAN JUAN, PR 00916-7888
PO BOX 7889, SAN JUAN, PR 00916-7889
PO BOX 7890, SAN JUAN, PR 00916-7890
PO BOX 7891, SAN JUAN, PR 00916-7891
PO BOX 7892, SAN JUAN, PR 00916-7892
PO BOX 7893, SAN JUAN, PR 00916-7893
PO BOX 7894, SAN JUAN, PR 00916-7894
PO BOX 7895, SAN JUAN, PR 00916-7895
PO BOX 7896, SAN JUAN, PR 00916-7896
PO BOX 7897, SAN JUAN, PR 00916-7897
PO BOX 7898, SAN JUAN, PR 00916-7898
PO BOX 7899, SAN JUAN, PR 00916-7899
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