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 1671, HIGHLAND PARK, IL 60035-7671
PO BOX 1672, HIGHLAND PARK, IL 60035-7672
PO BOX 1673, HIGHLAND PARK, IL 60035-7673
PO BOX 1674, HIGHLAND PARK, IL 60035-7674
PO BOX 1675, HIGHLAND PARK, IL 60035-7675
PO BOX 1676, HIGHLAND PARK, IL 60035-7676
PO BOX 1677, HIGHLAND PARK, IL 60035-7677
PO BOX 1678, HIGHLAND PARK, IL 60035-7678
PO BOX 1679, HIGHLAND PARK, IL 60035-7679
PO BOX 1680, HIGHLAND PARK, IL 60035-7680
PO BOX 1681, HIGHLAND PARK, IL 60035-7681
PO BOX 1682, HIGHLAND PARK, IL 60035-7682
PO BOX 1683, HIGHLAND PARK, IL 60035-7683
PO BOX 1684, HIGHLAND PARK, IL 60035-7684
PO BOX 1685, HIGHLAND PARK, IL 60035-7685
PO BOX 1686, HIGHLAND PARK, IL 60035-7686
PO BOX 1687, HIGHLAND PARK, IL 60035-7687
PO BOX 1688, HIGHLAND PARK, IL 60035-7688
PO BOX 1689, HIGHLAND PARK, IL 60035-7689
PO BOX 1690, HIGHLAND PARK, IL 60035-7690
PO BOX 1691, HIGHLAND PARK, IL 60035-7691
PO BOX 1692, HIGHLAND PARK, IL 60035-7692
PO BOX 1693, HIGHLAND PARK, IL 60035-7693
PO BOX 1694, HIGHLAND PARK, IL 60035-7694
PO BOX 1695, HIGHLAND PARK, IL 60035-7695
PO BOX 1696, HIGHLAND PARK, IL 60035-7696
PO BOX 1697, HIGHLAND PARK, IL 60035-7697
PO BOX 1698, HIGHLAND PARK, IL 60035-7698
PO BOX 1699, HIGHLAND PARK, IL 60035-7699
PO BOX 1700, HIGHLAND PARK, IL 60035-7700
PO BOX 1701, HIGHLAND PARK, IL 60035-7701
PO BOX 1702, HIGHLAND PARK, IL 60035-7702
PO BOX 1703, HIGHLAND PARK, IL 60035-7703
PO BOX 1704, HIGHLAND PARK, IL 60035-7704
PO BOX 1705, HIGHLAND PARK, IL 60035-7705
PO BOX 1706, HIGHLAND PARK, IL 60035-7706
PO BOX 1707, HIGHLAND PARK, IL 60035-7707
PO BOX 1708, HIGHLAND PARK, IL 60035-7708
PO BOX 1709, HIGHLAND PARK, IL 60035-7709
PO BOX 1710, HIGHLAND PARK, IL 60035-7710
PO BOX 1711, HIGHLAND PARK, IL 60035-7711
PO BOX 1712, HIGHLAND PARK, IL 60035-7712
PO BOX 1713, HIGHLAND PARK, IL 60035-7713
PO BOX 1714, HIGHLAND PARK, IL 60035-7714
PO BOX 1715, HIGHLAND PARK, IL 60035-7715
PO BOX 1716, HIGHLAND PARK, IL 60035-7716
PO BOX 1717, HIGHLAND PARK, IL 60035-7717
PO BOX 1718, HIGHLAND PARK, IL 60035-7718
PO BOX 1719, HIGHLAND PARK, IL 60035-7719
PO BOX 1720, HIGHLAND PARK, IL 60035-7720
PO BOX 1721, HIGHLAND PARK, IL 60035-7721
PO BOX 1722, HIGHLAND PARK, IL 60035-7722
PO BOX 1723, HIGHLAND PARK, IL 60035-7723
PO BOX 1724, HIGHLAND PARK, IL 60035-7724
PO BOX 1725, HIGHLAND PARK, IL 60035-7725
PO BOX 1726, HIGHLAND PARK, IL 60035-7726
PO BOX 1727, HIGHLAND PARK, IL 60035-7727
PO BOX 1728, HIGHLAND PARK, IL 60035-7728
PO BOX 1729, HIGHLAND PARK, IL 60035-7729
PO BOX 1730, HIGHLAND PARK, IL 60035-7730
PO BOX 1731, HIGHLAND PARK, IL 60035-7731
PO BOX 1732, HIGHLAND PARK, IL 60035-7732
PO BOX 1733, HIGHLAND PARK, IL 60035-7733
PO BOX 1734, HIGHLAND PARK, IL 60035-7734
PO BOX 1735, HIGHLAND PARK, IL 60035-7735
PO BOX 1736, HIGHLAND PARK, IL 60035-7736
PO BOX 1737, HIGHLAND PARK, IL 60035-7737
PO BOX 1738, HIGHLAND PARK, IL 60035-7738
PO BOX 1739, HIGHLAND PARK, IL 60035-7739
PO BOX 1740, HIGHLAND PARK, IL 60035-7740
PO BOX 1741, HIGHLAND PARK, IL 60035-7741
PO BOX 1742, HIGHLAND PARK, IL 60035-7742
PO BOX 1743, HIGHLAND PARK, IL 60035-7743
PO BOX 1744, HIGHLAND PARK, IL 60035-7744
PO BOX 1745, HIGHLAND PARK, IL 60035-7745
PO BOX 1746, HIGHLAND PARK, IL 60035-7746
PO BOX 1747, HIGHLAND PARK, IL 60035-7747
PO BOX 1748, HIGHLAND PARK, IL 60035-7748
PO BOX 1749, HIGHLAND PARK, IL 60035-7749
PO BOX 1750, HIGHLAND PARK, IL 60035-7750
PO BOX 1751, HIGHLAND PARK, IL 60035-7751
PO BOX 1752, HIGHLAND PARK, IL 60035-7752
PO BOX 1753, HIGHLAND PARK, IL 60035-7753
PO BOX 1754, HIGHLAND PARK, IL 60035-7754
PO BOX 1755, HIGHLAND PARK, IL 60035-7755
PO BOX 1756, HIGHLAND PARK, IL 60035-7756
PO BOX 1757, HIGHLAND PARK, IL 60035-7757
PO BOX 1758, HIGHLAND PARK, IL 60035-7758
PO BOX 1759, HIGHLAND PARK, IL 60035-7759
PO BOX 1760, HIGHLAND PARK, IL 60035-7760
PO BOX 1761, HIGHLAND PARK, IL 60035-7761
PO BOX 1762, HIGHLAND PARK, IL 60035-7762
PO BOX 1763, HIGHLAND PARK, IL 60035-7763
PO BOX 1764, HIGHLAND PARK, IL 60035-7764
PO BOX 1765, HIGHLAND PARK, IL 60035-7765
PO BOX 1766, HIGHLAND PARK, IL 60035-7766
PO BOX 1767, HIGHLAND PARK, IL 60035-7767
PO BOX 1768, HIGHLAND PARK, IL 60035-7768
PO BOX 1769, HIGHLAND PARK, IL 60035-7769
PO BOX 1770, HIGHLAND PARK, IL 60035-7770
PO BOX 1771, HIGHLAND PARK, IL 60035-7771
PO BOX 1772, HIGHLAND PARK, IL 60035-7772
PO BOX 1773, HIGHLAND PARK, IL 60035-7773
PO BOX 1774, HIGHLAND PARK, IL 60035-7774
PO BOX 1775, HIGHLAND PARK, IL 60035-7775
PO BOX 1776, HIGHLAND PARK, IL 60035-7776
PO BOX 1777, HIGHLAND PARK, IL 60035-7777
PO BOX 1778, HIGHLAND PARK, IL 60035-7778
PO BOX 1779, HIGHLAND PARK, IL 60035-7779
PO BOX 1780, HIGHLAND PARK, IL 60035-7780
PO BOX 1781, HIGHLAND PARK, IL 60035-7781
PO BOX 1782, HIGHLAND PARK, IL 60035-7782
PO BOX 1783, HIGHLAND PARK, IL 60035-7783
PO BOX 1784, HIGHLAND PARK, IL 60035-7784
PO BOX 1785, HIGHLAND PARK, IL 60035-7785
PO BOX 1786, HIGHLAND PARK, IL 60035-7786
PO BOX 1787, HIGHLAND PARK, IL 60035-7787
PO BOX 1788, HIGHLAND PARK, IL 60035-7788
PO BOX 1789, HIGHLAND PARK, IL 60035-7789
PO BOX 1790, HIGHLAND PARK, IL 60035-7790
PO BOX 1791, HIGHLAND PARK, IL 60035-7791
PO BOX 1792, HIGHLAND PARK, IL 60035-7792
PO BOX 1793, HIGHLAND PARK, IL 60035-7793
PO BOX 1794, HIGHLAND PARK, IL 60035-7794
PO BOX 1795, HIGHLAND PARK, IL 60035-7795
PO BOX 1796, HIGHLAND PARK, IL 60035-7796
PO BOX 1797, HIGHLAND PARK, IL 60035-7797
PO BOX 1798, HIGHLAND PARK, IL 60035-7798
PO BOX 1799, HIGHLAND PARK, IL 60035-7799
PO BOX 1800, HIGHLAND PARK, IL 60035-7800
PO BOX 1801, HIGHLAND PARK, IL 60035-7801
PO BOX 1802, HIGHLAND PARK, IL 60035-7802
PO BOX 1803, HIGHLAND PARK, IL 60035-7803
PO BOX 1804, HIGHLAND PARK, IL 60035-7804
PO BOX 1805, HIGHLAND PARK, IL 60035-7805
PO BOX 1806, HIGHLAND PARK, IL 60035-7806
PO BOX 1807, HIGHLAND PARK, IL 60035-7807
PO BOX 1808, HIGHLAND PARK, IL 60035-7808
PO BOX 1809, HIGHLAND PARK, IL 60035-7809
PO BOX 1810, HIGHLAND PARK, IL 60035-7810
PO BOX 1811, HIGHLAND PARK, IL 60035-7811
PO BOX 1812, HIGHLAND PARK, IL 60035-7812
PO BOX 1813, HIGHLAND PARK, IL 60035-7813
PO BOX 1814, HIGHLAND PARK, IL 60035-7814
PO BOX 1815, HIGHLAND PARK, IL 60035-7815
PO BOX 1816, HIGHLAND PARK, IL 60035-7816
PO BOX 1817, HIGHLAND PARK, IL 60035-7817
PO BOX 1818, HIGHLAND PARK, IL 60035-7818
PO BOX 1819, HIGHLAND PARK, IL 60035-7819
PO BOX 1820, HIGHLAND PARK, IL 60035-7820
PO BOX 1821, HIGHLAND PARK, IL 60035-7821
PO BOX 1822, HIGHLAND PARK, IL 60035-7822
PO BOX 1823, HIGHLAND PARK, IL 60035-7823
PO BOX 1824, HIGHLAND PARK, IL 60035-7824
PO BOX 1825, HIGHLAND PARK, IL 60035-7825
PO BOX 1826, HIGHLAND PARK, IL 60035-7826
PO BOX 1827, HIGHLAND PARK, IL 60035-7827
PO BOX 1828, HIGHLAND PARK, IL 60035-7828
PO BOX 1829, HIGHLAND PARK, IL 60035-7829
PO BOX 1830, HIGHLAND PARK, IL 60035-7830
PO BOX 1831, HIGHLAND PARK, IL 60035-7831
PO BOX 1832, HIGHLAND PARK, IL 60035-7832
PO BOX 1833, HIGHLAND PARK, IL 60035-7833
PO BOX 1834, HIGHLAND PARK, IL 60035-7834
PO BOX 1835, HIGHLAND PARK, IL 60035-7835
PO BOX 1836, HIGHLAND PARK, IL 60035-7836
PO BOX 1837, HIGHLAND PARK, IL 60035-7837
PO BOX 1838, HIGHLAND PARK, IL 60035-7838
PO BOX 1839, HIGHLAND PARK, IL 60035-7839
PO BOX 1840, HIGHLAND PARK, IL 60035-7840
PO BOX 1841, HIGHLAND PARK, IL 60035-7841
PO BOX 1842, HIGHLAND PARK, IL 60035-7842
PO BOX 1843, HIGHLAND PARK, IL 60035-7843
PO BOX 1844, HIGHLAND PARK, IL 60035-7844
PO BOX 1845, HIGHLAND PARK, IL 60035-7845
PO BOX 1846, HIGHLAND PARK, IL 60035-7846
PO BOX 1847, HIGHLAND PARK, IL 60035-7847
PO BOX 1848, HIGHLAND PARK, IL 60035-7848
PO BOX 1849, HIGHLAND PARK, IL 60035-7849
PO BOX 1850, HIGHLAND PARK, IL 60035-7850
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