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 1681, BORREGO SPRINGS, CA 92004-1681
PO BOX 1682, BORREGO SPRINGS, CA 92004-1682
PO BOX 1683, BORREGO SPRINGS, CA 92004-1683
PO BOX 1684, BORREGO SPRINGS, CA 92004-1684
PO BOX 1685, BORREGO SPRINGS, CA 92004-1685
PO BOX 1686, BORREGO SPRINGS, CA 92004-1686
PO BOX 1687, BORREGO SPRINGS, CA 92004-1687
PO BOX 1688, BORREGO SPRINGS, CA 92004-1688
PO BOX 1689, BORREGO SPRINGS, CA 92004-1689
PO BOX 1690, BORREGO SPRINGS, CA 92004-1690
PO BOX 1691, BORREGO SPRINGS, CA 92004-1691
PO BOX 1692, BORREGO SPRINGS, CA 92004-1692
PO BOX 1693, BORREGO SPRINGS, CA 92004-1693
PO BOX 1694, BORREGO SPRINGS, CA 92004-1694
PO BOX 1695, BORREGO SPRINGS, CA 92004-1695
PO BOX 1696, BORREGO SPRINGS, CA 92004-1696
PO BOX 1697, BORREGO SPRINGS, CA 92004-1697
PO BOX 1698, BORREGO SPRINGS, CA 92004-1698
PO BOX 1699, BORREGO SPRINGS, CA 92004-1699
PO BOX 1700, BORREGO SPRINGS, CA 92004-1700
PO BOX 1701, BORREGO SPRINGS, CA 92004-1701
PO BOX 1702, BORREGO SPRINGS, CA 92004-1702
PO BOX 1703, BORREGO SPRINGS, CA 92004-1703
PO BOX 1704, BORREGO SPRINGS, CA 92004-1704
PO BOX 1705, BORREGO SPRINGS, CA 92004-1705
PO BOX 1706, BORREGO SPRINGS, CA 92004-1706
PO BOX 1707, BORREGO SPRINGS, CA 92004-1707
PO BOX 1708, BORREGO SPRINGS, CA 92004-1708
PO BOX 1709, BORREGO SPRINGS, CA 92004-1709
PO BOX 1710, BORREGO SPRINGS, CA 92004-1710
PO BOX 1711, BORREGO SPRINGS, CA 92004-1711
PO BOX 1712, BORREGO SPRINGS, CA 92004-1712
PO BOX 1713, BORREGO SPRINGS, CA 92004-1713
PO BOX 1714, BORREGO SPRINGS, CA 92004-1714
PO BOX 1715, BORREGO SPRINGS, CA 92004-1715
PO BOX 1716, BORREGO SPRINGS, CA 92004-1716
PO BOX 1717, BORREGO SPRINGS, CA 92004-1717
PO BOX 1718, BORREGO SPRINGS, CA 92004-1718
PO BOX 1719, BORREGO SPRINGS, CA 92004-1719
PO BOX 1720, BORREGO SPRINGS, CA 92004-1720
PO BOX 1721, BORREGO SPRINGS, CA 92004-1721
PO BOX 1722, BORREGO SPRINGS, CA 92004-1722
PO BOX 1723, BORREGO SPRINGS, CA 92004-1723
PO BOX 1724, BORREGO SPRINGS, CA 92004-1724
PO BOX 1725, BORREGO SPRINGS, CA 92004-1725
PO BOX 1726, BORREGO SPRINGS, CA 92004-1726
PO BOX 1727, BORREGO SPRINGS, CA 92004-1727
PO BOX 1728, BORREGO SPRINGS, CA 92004-1728
PO BOX 1729, BORREGO SPRINGS, CA 92004-1729
PO BOX 1730, BORREGO SPRINGS, CA 92004-1730
PO BOX 1731, BORREGO SPRINGS, CA 92004-1731
PO BOX 1732, BORREGO SPRINGS, CA 92004-1732
PO BOX 1733, BORREGO SPRINGS, CA 92004-1733
PO BOX 1734, BORREGO SPRINGS, CA 92004-1734
PO BOX 1735, BORREGO SPRINGS, CA 92004-1735
PO BOX 1736, BORREGO SPRINGS, CA 92004-1736
PO BOX 1737, BORREGO SPRINGS, CA 92004-1737
PO BOX 1738, BORREGO SPRINGS, CA 92004-1738
PO BOX 1739, BORREGO SPRINGS, CA 92004-1739
PO BOX 1740, BORREGO SPRINGS, CA 92004-1740
PO BOX 1741, BORREGO SPRINGS, CA 92004-1741
PO BOX 1742, BORREGO SPRINGS, CA 92004-1742
PO BOX 1743, BORREGO SPRINGS, CA 92004-1743
PO BOX 1744, BORREGO SPRINGS, CA 92004-1744
PO BOX 1745, BORREGO SPRINGS, CA 92004-1745
PO BOX 1746, BORREGO SPRINGS, CA 92004-1746
PO BOX 1747, BORREGO SPRINGS, CA 92004-1747
PO BOX 1748, BORREGO SPRINGS, CA 92004-1748
PO BOX 1749, BORREGO SPRINGS, CA 92004-1749
PO BOX 1750, BORREGO SPRINGS, CA 92004-1750
PO BOX 1751, BORREGO SPRINGS, CA 92004-1751
PO BOX 1752, BORREGO SPRINGS, CA 92004-1752
PO BOX 1753, BORREGO SPRINGS, CA 92004-1753
PO BOX 1754, BORREGO SPRINGS, CA 92004-1754
PO BOX 1755, BORREGO SPRINGS, CA 92004-1755
PO BOX 1756, BORREGO SPRINGS, CA 92004-1756
PO BOX 1757, BORREGO SPRINGS, CA 92004-1757
PO BOX 1758, BORREGO SPRINGS, CA 92004-1758
PO BOX 1759, BORREGO SPRINGS, CA 92004-1759
PO BOX 1760, BORREGO SPRINGS, CA 92004-1760
PO BOX 1761, BORREGO SPRINGS, CA 92004-1761
PO BOX 1762, BORREGO SPRINGS, CA 92004-1762
PO BOX 1763, BORREGO SPRINGS, CA 92004-1763
PO BOX 1764, BORREGO SPRINGS, CA 92004-1764
PO BOX 1765, BORREGO SPRINGS, CA 92004-1765
PO BOX 1766, BORREGO SPRINGS, CA 92004-1766
PO BOX 1767, BORREGO SPRINGS, CA 92004-1767
PO BOX 1768, BORREGO SPRINGS, CA 92004-1768
PO BOX 1769, BORREGO SPRINGS, CA 92004-1769
PO BOX 1770, BORREGO SPRINGS, CA 92004-1770
PO BOX 1771, BORREGO SPRINGS, CA 92004-1771
PO BOX 1772, BORREGO SPRINGS, CA 92004-1772
PO BOX 1773, BORREGO SPRINGS, CA 92004-1773
PO BOX 1774, BORREGO SPRINGS, CA 92004-1774
PO BOX 1775, BORREGO SPRINGS, CA 92004-1775
PO BOX 1776, BORREGO SPRINGS, CA 92004-1776
PO BOX 1777, BORREGO SPRINGS, CA 92004-1777
PO BOX 1778, BORREGO SPRINGS, CA 92004-1778
PO BOX 1779, BORREGO SPRINGS, CA 92004-1779
PO BOX 1780, BORREGO SPRINGS, CA 92004-1780
PO BOX 1781, BORREGO SPRINGS, CA 92004-1781
PO BOX 1782, BORREGO SPRINGS, CA 92004-1782
PO BOX 1783, BORREGO SPRINGS, CA 92004-1783
PO BOX 1784, BORREGO SPRINGS, CA 92004-1784
PO BOX 1785, BORREGO SPRINGS, CA 92004-1785
PO BOX 1786, BORREGO SPRINGS, CA 92004-1786
PO BOX 1787, BORREGO SPRINGS, CA 92004-1787
PO BOX 1788, BORREGO SPRINGS, CA 92004-1788
PO BOX 1789, BORREGO SPRINGS, CA 92004-1789
PO BOX 1790, BORREGO SPRINGS, CA 92004-1790
PO BOX 1791, BORREGO SPRINGS, CA 92004-1791
PO BOX 1792, BORREGO SPRINGS, CA 92004-1792
PO BOX 1793, BORREGO SPRINGS, CA 92004-1793
PO BOX 1794, BORREGO SPRINGS, CA 92004-1794
PO BOX 1795, BORREGO SPRINGS, CA 92004-1795
PO BOX 1796, BORREGO SPRINGS, CA 92004-1796
PO BOX 1797, BORREGO SPRINGS, CA 92004-1797
PO BOX 1798, BORREGO SPRINGS, CA 92004-1798
PO BOX 1799, BORREGO SPRINGS, CA 92004-1799
PO BOX 1800, BORREGO SPRINGS, CA 92004-1800
PO BOX 1801, BORREGO SPRINGS, CA 92004-1801
PO BOX 1802, BORREGO SPRINGS, CA 92004-1802
PO BOX 1803, BORREGO SPRINGS, CA 92004-1803
PO BOX 1804, BORREGO SPRINGS, CA 92004-1804
PO BOX 1805, BORREGO SPRINGS, CA 92004-1805
PO BOX 1806, BORREGO SPRINGS, CA 92004-1806
PO BOX 1807, BORREGO SPRINGS, CA 92004-1807
PO BOX 1808, BORREGO SPRINGS, CA 92004-1808
PO BOX 1809, BORREGO SPRINGS, CA 92004-1809
PO BOX 1810, BORREGO SPRINGS, CA 92004-1810
PO BOX 1811, BORREGO SPRINGS, CA 92004-1811
PO BOX 1812, BORREGO SPRINGS, CA 92004-1812
PO BOX 1813, BORREGO SPRINGS, CA 92004-1813
PO BOX 1814, BORREGO SPRINGS, CA 92004-1814
PO BOX 1815, BORREGO SPRINGS, CA 92004-1815
PO BOX 1816, BORREGO SPRINGS, CA 92004-1816
PO BOX 1817, BORREGO SPRINGS, CA 92004-1817
PO BOX 1818, BORREGO SPRINGS, CA 92004-1818
PO BOX 1819, BORREGO SPRINGS, CA 92004-1819
PO BOX 1820, BORREGO SPRINGS, CA 92004-1820
PO BOX 1821, BORREGO SPRINGS, CA 92004-1821
PO BOX 1822, BORREGO SPRINGS, CA 92004-1822
PO BOX 1823, BORREGO SPRINGS, CA 92004-1823
PO BOX 1824, BORREGO SPRINGS, CA 92004-1824
PO BOX 1825, BORREGO SPRINGS, CA 92004-1825
PO BOX 1826, BORREGO SPRINGS, CA 92004-1826
PO BOX 1827, BORREGO SPRINGS, CA 92004-1827
PO BOX 1828, BORREGO SPRINGS, CA 92004-1828
PO BOX 1829, BORREGO SPRINGS, CA 92004-1829
PO BOX 1830, BORREGO SPRINGS, CA 92004-1830
PO BOX 1831, BORREGO SPRINGS, CA 92004-1831
PO BOX 1832, BORREGO SPRINGS, CA 92004-1832
PO BOX 1833, BORREGO SPRINGS, CA 92004-1833
PO BOX 1834, BORREGO SPRINGS, CA 92004-1834
PO BOX 1835, BORREGO SPRINGS, CA 92004-1835
PO BOX 1836, BORREGO SPRINGS, CA 92004-1836
PO BOX 1837, BORREGO SPRINGS, CA 92004-1837
PO BOX 1838, BORREGO SPRINGS, CA 92004-1838
PO BOX 1839, BORREGO SPRINGS, CA 92004-1839
PO BOX 1840, BORREGO SPRINGS, CA 92004-1840
PO BOX 1841, BORREGO SPRINGS, CA 92004-1841
PO BOX 1842, BORREGO SPRINGS, CA 92004-1842
PO BOX 1843, BORREGO SPRINGS, CA 92004-1843
PO BOX 1844, BORREGO SPRINGS, CA 92004-1844
PO BOX 1845, BORREGO SPRINGS, CA 92004-1845
PO BOX 1846, BORREGO SPRINGS, CA 92004-1846
PO BOX 1847, BORREGO SPRINGS, CA 92004-1847
PO BOX 1848, BORREGO SPRINGS, CA 92004-1848
PO BOX 1849, BORREGO SPRINGS, CA 92004-1849
PO BOX 1850, BORREGO SPRINGS, CA 92004-1850
PO BOX 1851, BORREGO SPRINGS, CA 92004-1851
PO BOX 1852, BORREGO SPRINGS, CA 92004-1852
PO BOX 1853, BORREGO SPRINGS, CA 92004-1853
PO BOX 1854, BORREGO SPRINGS, CA 92004-1854
PO BOX 1855, BORREGO SPRINGS, CA 92004-1855
PO BOX 1856, BORREGO SPRINGS, CA 92004-1856
PO BOX 1857, BORREGO SPRINGS, CA 92004-1857
PO BOX 1858, BORREGO SPRINGS, CA 92004-1858
PO BOX 1859, BORREGO SPRINGS, CA 92004-1859
PO BOX 1860, BORREGO SPRINGS, CA 92004-1860
PO BOX 1861, BORREGO SPRINGS, CA 92004-1861
PO BOX 1862, BORREGO SPRINGS, CA 92004-1862
PO BOX 1863, BORREGO SPRINGS, CA 92004-1863
PO BOX 1864, BORREGO SPRINGS, CA 92004-1864
PO BOX 1865, BORREGO SPRINGS, CA 92004-1865
PO BOX 1866, BORREGO SPRINGS, CA 92004-1866
PO BOX 1867, BORREGO SPRINGS, CA 92004-1867
PO BOX 1868, BORREGO SPRINGS, CA 92004-1868
PO BOX 1869, BORREGO SPRINGS, CA 92004-1869
PO BOX 1870, BORREGO SPRINGS, CA 92004-1870
PO BOX 1871, BORREGO SPRINGS, CA 92004-1871
PO BOX 1872, BORREGO SPRINGS, CA 92004-1872
PO BOX 1873, BORREGO SPRINGS, CA 92004-1873
PO BOX 1874, BORREGO SPRINGS, CA 92004-1874
PO BOX 1875, BORREGO SPRINGS, CA 92004-1875
PO BOX 1876, BORREGO SPRINGS, CA 92004-1876
PO BOX 1877, BORREGO SPRINGS, CA 92004-1877
PO BOX 1878, BORREGO SPRINGS, CA 92004-1878
PO BOX 1879, BORREGO SPRINGS, CA 92004-1879
PO BOX 1880, BORREGO SPRINGS, CA 92004-1880
PO BOX 1881, BORREGO SPRINGS, CA 92004-1881
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