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 1741, SAN MARCOS, CA 92079-1741
PO BOX 1742, SAN MARCOS, CA 92079-1742
PO BOX 1743, SAN MARCOS, CA 92079-1743
PO BOX 1744, SAN MARCOS, CA 92079-1744
PO BOX 1745, SAN MARCOS, CA 92079-1745
PO BOX 1746, SAN MARCOS, CA 92079-1746
PO BOX 1747, SAN MARCOS, CA 92079-1747
PO BOX 1748, SAN MARCOS, CA 92079-1748
PO BOX 1749, SAN MARCOS, CA 92079-1749
PO BOX 1750, SAN MARCOS, CA 92079-1750
PO BOX 1751, SAN MARCOS, CA 92079-1751
PO BOX 1752, SAN MARCOS, CA 92079-1752
PO BOX 1753, SAN MARCOS, CA 92079-1753
PO BOX 1754, SAN MARCOS, CA 92079-1754
PO BOX 1755, SAN MARCOS, CA 92079-1755
PO BOX 1756, SAN MARCOS, CA 92079-1756
PO BOX 1757, SAN MARCOS, CA 92079-1757
PO BOX 1758, SAN MARCOS, CA 92079-1758
PO BOX 1759, SAN MARCOS, CA 92079-1759
PO BOX 1760, SAN MARCOS, CA 92079-1760
PO BOX 1761, SAN MARCOS, CA 92079-1761
PO BOX 1762, SAN MARCOS, CA 92079-1762
PO BOX 1763, SAN MARCOS, CA 92079-1763
PO BOX 1764, SAN MARCOS, CA 92079-1764
PO BOX 1765, SAN MARCOS, CA 92079-1765
PO BOX 1766, SAN MARCOS, CA 92079-1766
PO BOX 1767, SAN MARCOS, CA 92079-1767
PO BOX 1768, SAN MARCOS, CA 92079-1768
PO BOX 1769, SAN MARCOS, CA 92079-1769
PO BOX 1770, SAN MARCOS, CA 92079-1770
PO BOX 1771, SAN MARCOS, CA 92079-1771
PO BOX 1772, SAN MARCOS, CA 92079-1772
PO BOX 1773, SAN MARCOS, CA 92079-1773
PO BOX 1774, SAN MARCOS, CA 92079-1774
PO BOX 1775, SAN MARCOS, CA 92079-1775
PO BOX 1776, SAN MARCOS, CA 92079-1776
PO BOX 1777, SAN MARCOS, CA 92079-1777
PO BOX 1778, SAN MARCOS, CA 92079-1778
PO BOX 1779, SAN MARCOS, CA 92079-1779
PO BOX 1780, SAN MARCOS, CA 92079-1780
PO BOX 1781, SAN MARCOS, CA 92079-1781
PO BOX 1782, SAN MARCOS, CA 92079-1782
PO BOX 1783, SAN MARCOS, CA 92079-1783
PO BOX 1784, SAN MARCOS, CA 92079-1784
PO BOX 1785, SAN MARCOS, CA 92079-1785
PO BOX 1786, SAN MARCOS, CA 92079-1786
PO BOX 1787, SAN MARCOS, CA 92079-1787
PO BOX 1788, SAN MARCOS, CA 92079-1788
PO BOX 1789, SAN MARCOS, CA 92079-1789
PO BOX 1790, SAN MARCOS, CA 92079-1790
PO BOX 1791, SAN MARCOS, CA 92079-1791
PO BOX 1792, SAN MARCOS, CA 92079-1792
PO BOX 1793, SAN MARCOS, CA 92079-1793
PO BOX 1794, SAN MARCOS, CA 92079-1794
PO BOX 1795, SAN MARCOS, CA 92079-1795
PO BOX 1796, SAN MARCOS, CA 92079-1796
PO BOX 1797, SAN MARCOS, CA 92079-1797
PO BOX 1798, SAN MARCOS, CA 92079-1798
PO BOX 1799, SAN MARCOS, CA 92079-1799
PO BOX 1800, SAN MARCOS, CA 92079-1800
PO BOX 1801, SAN MARCOS, CA 92079-1801
PO BOX 1802, SAN MARCOS, CA 92079-1802
PO BOX 1803, SAN MARCOS, CA 92079-1803
PO BOX 1804, SAN MARCOS, CA 92079-1804
PO BOX 1805, SAN MARCOS, CA 92079-1805
PO BOX 1806, SAN MARCOS, CA 92079-1806
PO BOX 1807, SAN MARCOS, CA 92079-1807
PO BOX 1808, SAN MARCOS, CA 92079-1808
PO BOX 1809, SAN MARCOS, CA 92079-1809
PO BOX 1810, SAN MARCOS, CA 92079-1810
PO BOX 1811, SAN MARCOS, CA 92079-1811
PO BOX 1812, SAN MARCOS, CA 92079-1812
PO BOX 1813, SAN MARCOS, CA 92079-1813
PO BOX 1814, SAN MARCOS, CA 92079-1814
PO BOX 1815, SAN MARCOS, CA 92079-1815
PO BOX 1816, SAN MARCOS, CA 92079-1816
PO BOX 1817, SAN MARCOS, CA 92079-1817
PO BOX 1818, SAN MARCOS, CA 92079-1818
PO BOX 1819, SAN MARCOS, CA 92079-1819
PO BOX 1820, SAN MARCOS, CA 92079-1820
PO BOX 1821, SAN MARCOS, CA 92079-1821
PO BOX 1822, SAN MARCOS, CA 92079-1822
PO BOX 1823, SAN MARCOS, CA 92079-1823
PO BOX 1824, SAN MARCOS, CA 92079-1824
PO BOX 1825, SAN MARCOS, CA 92079-1825
PO BOX 1826, SAN MARCOS, CA 92079-1826
PO BOX 1827, SAN MARCOS, CA 92079-1827
PO BOX 1828, SAN MARCOS, CA 92079-1828
PO BOX 1829, SAN MARCOS, CA 92079-1829
PO BOX 1830, SAN MARCOS, CA 92079-1830
PO BOX 1831, SAN MARCOS, CA 92079-1831
PO BOX 1832, SAN MARCOS, CA 92079-1832
PO BOX 1833, SAN MARCOS, CA 92079-1833
PO BOX 1834, SAN MARCOS, CA 92079-1834
PO BOX 1835, SAN MARCOS, CA 92079-1835
PO BOX 1836, SAN MARCOS, CA 92079-1836
PO BOX 1837, SAN MARCOS, CA 92079-1837
PO BOX 1838, SAN MARCOS, CA 92079-1838
PO BOX 1839, SAN MARCOS, CA 92079-1839
PO BOX 1840, SAN MARCOS, CA 92079-1840
PO BOX 1841, SAN MARCOS, CA 92079-1841
PO BOX 1842, SAN MARCOS, CA 92079-1842
PO BOX 1843, SAN MARCOS, CA 92079-1843
PO BOX 1844, SAN MARCOS, CA 92079-1844
PO BOX 1845, SAN MARCOS, CA 92079-1845
PO BOX 1846, SAN MARCOS, CA 92079-1846
PO BOX 1847, SAN MARCOS, CA 92079-1847
PO BOX 1848, SAN MARCOS, CA 92079-1848
PO BOX 1849, SAN MARCOS, CA 92079-1849
PO BOX 1850, SAN MARCOS, CA 92079-1850
PO BOX 1851, SAN MARCOS, CA 92079-1851
PO BOX 1852, SAN MARCOS, CA 92079-1852
PO BOX 1853, SAN MARCOS, CA 92079-1853
PO BOX 1854, SAN MARCOS, CA 92079-1854
PO BOX 1855, SAN MARCOS, CA 92079-1855
PO BOX 1856, SAN MARCOS, CA 92079-1856
PO BOX 1857, SAN MARCOS, CA 92079-1857
PO BOX 1858, SAN MARCOS, CA 92079-1858
PO BOX 1859, SAN MARCOS, CA 92079-1859
PO BOX 1860, SAN MARCOS, CA 92079-1860
PO BOX 1861, SAN MARCOS, CA 92079-1861
PO BOX 1862, SAN MARCOS, CA 92079-1862
PO BOX 1863, SAN MARCOS, CA 92079-1863
PO BOX 1864, SAN MARCOS, CA 92079-1864
PO BOX 1865, SAN MARCOS, CA 92079-1865
PO BOX 1866, SAN MARCOS, CA 92079-1866
PO BOX 1867, SAN MARCOS, CA 92079-1867
PO BOX 1868, SAN MARCOS, CA 92079-1868
PO BOX 1869, SAN MARCOS, CA 92079-1869
PO BOX 1870, SAN MARCOS, CA 92079-1870
PO BOX 1871, SAN MARCOS, CA 92079-1871
PO BOX 1872, SAN MARCOS, CA 92079-1872
PO BOX 1873, SAN MARCOS, CA 92079-1873
PO BOX 1874, SAN MARCOS, CA 92079-1874
PO BOX 1875, SAN MARCOS, CA 92079-1875
PO BOX 1876, SAN MARCOS, CA 92079-1876
PO BOX 1877, SAN MARCOS, CA 92079-1877
PO BOX 1878, SAN MARCOS, CA 92079-1878
PO BOX 1879, SAN MARCOS, CA 92079-1879
PO BOX 1880, SAN MARCOS, CA 92079-1880
PO BOX 1881, SAN MARCOS, CA 92079-1881
PO BOX 1882, SAN MARCOS, CA 92079-1882
PO BOX 1883, SAN MARCOS, CA 92079-1883
PO BOX 1884, SAN MARCOS, CA 92079-1884
PO BOX 1885, SAN MARCOS, CA 92079-1885
PO BOX 1886, SAN MARCOS, CA 92079-1886
PO BOX 1887, SAN MARCOS, CA 92079-1887
PO BOX 1888, SAN MARCOS, CA 92079-1888
PO BOX 1889, SAN MARCOS, CA 92079-1889
PO BOX 1890, SAN MARCOS, CA 92079-1890
PO BOX 1891, SAN MARCOS, CA 92079-1891
PO BOX 1892, SAN MARCOS, CA 92079-1892
PO BOX 1893, SAN MARCOS, CA 92079-1893
PO BOX 1894, SAN MARCOS, CA 92079-1894
PO BOX 1895, SAN MARCOS, CA 92079-1895
PO BOX 1896, SAN MARCOS, CA 92079-1896
PO BOX 1897, SAN MARCOS, CA 92079-1897
PO BOX 1898, SAN MARCOS, CA 92079-1898
PO BOX 1899, SAN MARCOS, CA 92079-1899
PO BOX 1900, SAN MARCOS, CA 92079-1900
PO BOX 1901, SAN MARCOS, CA 92079-1901
PO BOX 1902, SAN MARCOS, CA 92079-1902
PO BOX 1903, SAN MARCOS, CA 92079-1903
PO BOX 1904, SAN MARCOS, CA 92079-1904
PO BOX 1905, SAN MARCOS, CA 92079-1905
PO BOX 1906, SAN MARCOS, CA 92079-1906
PO BOX 1907, SAN MARCOS, CA 92079-1907
PO BOX 1908, SAN MARCOS, CA 92079-1908
PO BOX 1909, SAN MARCOS, CA 92079-1909
PO BOX 1910, SAN MARCOS, CA 92079-1910
PO BOX 1911, SAN MARCOS, CA 92079-1911
PO BOX 1912, SAN MARCOS, CA 92079-1912
PO BOX 1913, SAN MARCOS, CA 92079-1913
PO BOX 1914, SAN MARCOS, CA 92079-1914
PO BOX 1915, SAN MARCOS, CA 92079-1915
PO BOX 1916, SAN MARCOS, CA 92079-1916
PO BOX 1917, SAN MARCOS, CA 92079-1917
PO BOX 1918, SAN MARCOS, CA 92079-1918
PO BOX 1919, SAN MARCOS, CA 92079-1919
PO BOX 1920, SAN MARCOS, CA 92079-1920
PO BOX 1921, SAN MARCOS, CA 92079-1921
PO BOX 1922, SAN MARCOS, CA 92079-1922
PO BOX 1923, SAN MARCOS, CA 92079-1923
PO BOX 1924, SAN MARCOS, CA 92079-1924
PO BOX 1925, SAN MARCOS, CA 92079-1925
PO BOX 1926, SAN MARCOS, CA 92079-1926
PO BOX 1927, SAN MARCOS, CA 92079-1927
PO BOX 1928, SAN MARCOS, CA 92079-1928
PO BOX 1929, SAN MARCOS, CA 92079-1929
PO BOX 1930, SAN MARCOS, CA 92079-1930
PO BOX 1931, SAN MARCOS, CA 92079-1931
PO BOX 1932, SAN MARCOS, CA 92079-1932
PO BOX 1933, SAN MARCOS, CA 92079-1933
PO BOX 1934, SAN MARCOS, CA 92079-1934
PO BOX 1935, SAN MARCOS, CA 92079-1935
PO BOX 1936, SAN MARCOS, CA 92079-1936
PO BOX 1937, SAN MARCOS, CA 92079-1937
PO BOX 1938, SAN MARCOS, CA 92079-1938
PO BOX 1939, SAN MARCOS, CA 92079-1939
PO BOX 1940, SAN MARCOS, CA 92079-1940
PO BOX 1941, SAN MARCOS, CA 92079-1941
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