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, SIOUX FALLS, SD 57101-1741
PO BOX 1742, SIOUX FALLS, SD 57101-1742
PO BOX 1743, SIOUX FALLS, SD 57101-1743
PO BOX 1744, SIOUX FALLS, SD 57101-1744
PO BOX 1745, SIOUX FALLS, SD 57101-1745
PO BOX 1746, SIOUX FALLS, SD 57101-1746
PO BOX 1747, SIOUX FALLS, SD 57101-1747
PO BOX 1748, SIOUX FALLS, SD 57101-1748
PO BOX 1749, SIOUX FALLS, SD 57101-1749
PO BOX 1750, SIOUX FALLS, SD 57101-1750
PO BOX 1751, SIOUX FALLS, SD 57101-1751
PO BOX 1752, SIOUX FALLS, SD 57101-1752
PO BOX 1753, SIOUX FALLS, SD 57101-1753
PO BOX 1754, SIOUX FALLS, SD 57101-1754
PO BOX 1755, SIOUX FALLS, SD 57101-1755
PO BOX 1756, SIOUX FALLS, SD 57101-1756
PO BOX 1757, SIOUX FALLS, SD 57101-1757
PO BOX 1758, SIOUX FALLS, SD 57101-1758
PO BOX 1759, SIOUX FALLS, SD 57101-1759
PO BOX 1760, SIOUX FALLS, SD 57101-1760
PO BOX 1761, SIOUX FALLS, SD 57101-1761
PO BOX 1762, SIOUX FALLS, SD 57101-1762
PO BOX 1763, SIOUX FALLS, SD 57101-1763
PO BOX 1764, SIOUX FALLS, SD 57101-1764
PO BOX 1765, SIOUX FALLS, SD 57101-1765
PO BOX 1766, SIOUX FALLS, SD 57101-1766
PO BOX 1767, SIOUX FALLS, SD 57101-1767
PO BOX 1768, SIOUX FALLS, SD 57101-1768
PO BOX 1769, SIOUX FALLS, SD 57101-1769
PO BOX 1770, SIOUX FALLS, SD 57101-1770
PO BOX 1771, SIOUX FALLS, SD 57101-1771
PO BOX 1772, SIOUX FALLS, SD 57101-1772
PO BOX 1773, SIOUX FALLS, SD 57101-1773
PO BOX 1774, SIOUX FALLS, SD 57101-1774
PO BOX 1775, SIOUX FALLS, SD 57101-1775
PO BOX 1776, SIOUX FALLS, SD 57101-1776
PO BOX 1777, SIOUX FALLS, SD 57101-1777
PO BOX 1778, SIOUX FALLS, SD 57101-1778
PO BOX 1779, SIOUX FALLS, SD 57101-1779
PO BOX 1780, SIOUX FALLS, SD 57101-1780
PO BOX 1781, SIOUX FALLS, SD 57101-1781
PO BOX 1782, SIOUX FALLS, SD 57101-1782
PO BOX 1783, SIOUX FALLS, SD 57101-1783
PO BOX 1784, SIOUX FALLS, SD 57101-1784
PO BOX 1785, SIOUX FALLS, SD 57101-1785
PO BOX 1786, SIOUX FALLS, SD 57101-1786
PO BOX 1787, SIOUX FALLS, SD 57101-1787
PO BOX 1788, SIOUX FALLS, SD 57101-1788
PO BOX 1789, SIOUX FALLS, SD 57101-1789
PO BOX 1790, SIOUX FALLS, SD 57101-1790
PO BOX 1791, SIOUX FALLS, SD 57101-1791
PO BOX 1792, SIOUX FALLS, SD 57101-1792
PO BOX 1793, SIOUX FALLS, SD 57101-1793
PO BOX 1794, SIOUX FALLS, SD 57101-1794
PO BOX 1795, SIOUX FALLS, SD 57101-1795
PO BOX 1796, SIOUX FALLS, SD 57101-1796
PO BOX 1797, SIOUX FALLS, SD 57101-1797
PO BOX 1798, SIOUX FALLS, SD 57101-1798
PO BOX 1799, SIOUX FALLS, SD 57101-1799
PO BOX 1800, SIOUX FALLS, SD 57101-1800
PO BOX 1801, SIOUX FALLS, SD 57101-1801
PO BOX 1802, SIOUX FALLS, SD 57101-1802
PO BOX 1803, SIOUX FALLS, SD 57101-1803
PO BOX 1804, SIOUX FALLS, SD 57101-1804
PO BOX 1805, SIOUX FALLS, SD 57101-1805
PO BOX 1806, SIOUX FALLS, SD 57101-1806
PO BOX 1807, SIOUX FALLS, SD 57101-1807
PO BOX 1808, SIOUX FALLS, SD 57101-1808
PO BOX 1809, SIOUX FALLS, SD 57101-1809
PO BOX 1810, SIOUX FALLS, SD 57101-1810
PO BOX 1811, SIOUX FALLS, SD 57101-1811
PO BOX 1812, SIOUX FALLS, SD 57101-1812
PO BOX 1813, SIOUX FALLS, SD 57101-1813
PO BOX 1814, SIOUX FALLS, SD 57101-1814
PO BOX 1815, SIOUX FALLS, SD 57101-1815
PO BOX 1816, SIOUX FALLS, SD 57101-1816
PO BOX 1817, SIOUX FALLS, SD 57101-1817
PO BOX 1818, SIOUX FALLS, SD 57101-1818
PO BOX 1819, SIOUX FALLS, SD 57101-1819
PO BOX 1820, SIOUX FALLS, SD 57101-1820
PO BOX 1821, SIOUX FALLS, SD 57101-1821
PO BOX 1822, SIOUX FALLS, SD 57101-1822
PO BOX 1823, SIOUX FALLS, SD 57101-1823
PO BOX 1824, SIOUX FALLS, SD 57101-1824
PO BOX 1825, SIOUX FALLS, SD 57101-1825
PO BOX 1826, SIOUX FALLS, SD 57101-1826
PO BOX 1827, SIOUX FALLS, SD 57101-1827
PO BOX 1828, SIOUX FALLS, SD 57101-1828
PO BOX 1829, SIOUX FALLS, SD 57101-1829
PO BOX 1830, SIOUX FALLS, SD 57101-1830
PO BOX 1831, SIOUX FALLS, SD 57101-1831
PO BOX 1832, SIOUX FALLS, SD 57101-1832
PO BOX 1833, SIOUX FALLS, SD 57101-1833
PO BOX 1834, SIOUX FALLS, SD 57101-1834
PO BOX 1835, SIOUX FALLS, SD 57101-1835
PO BOX 1836, SIOUX FALLS, SD 57101-1836
PO BOX 1837, SIOUX FALLS, SD 57101-1837
PO BOX 1838, SIOUX FALLS, SD 57101-1838
PO BOX 1839, SIOUX FALLS, SD 57101-1839
PO BOX 1840, SIOUX FALLS, SD 57101-1840
PO BOX 1841, SIOUX FALLS, SD 57101-1841
PO BOX 1842, SIOUX FALLS, SD 57101-1842
PO BOX 1843, SIOUX FALLS, SD 57101-1843
PO BOX 1844, SIOUX FALLS, SD 57101-1844
PO BOX 1845, SIOUX FALLS, SD 57101-1845
PO BOX 1846, SIOUX FALLS, SD 57101-1846
PO BOX 1847, SIOUX FALLS, SD 57101-1847
PO BOX 1848, SIOUX FALLS, SD 57101-1848
PO BOX 1849, SIOUX FALLS, SD 57101-1849
PO BOX 1850, SIOUX FALLS, SD 57101-1850
PO BOX 1851, SIOUX FALLS, SD 57101-1851
PO BOX 1852, SIOUX FALLS, SD 57101-1852
PO BOX 1853, SIOUX FALLS, SD 57101-1853
PO BOX 1854, SIOUX FALLS, SD 57101-1854
PO BOX 1855, SIOUX FALLS, SD 57101-1855
PO BOX 1856, SIOUX FALLS, SD 57101-1856
PO BOX 1857, SIOUX FALLS, SD 57101-1857
PO BOX 1858, SIOUX FALLS, SD 57101-1858
PO BOX 1859, SIOUX FALLS, SD 57101-1859
PO BOX 1860, SIOUX FALLS, SD 57101-1860
PO BOX 1861, SIOUX FALLS, SD 57101-1861
PO BOX 1862, SIOUX FALLS, SD 57101-1862
PO BOX 1863, SIOUX FALLS, SD 57101-1863
PO BOX 1864, SIOUX FALLS, SD 57101-1864
PO BOX 1865, SIOUX FALLS, SD 57101-1865
PO BOX 1866, SIOUX FALLS, SD 57101-1866
PO BOX 1867, SIOUX FALLS, SD 57101-1867
PO BOX 1868, SIOUX FALLS, SD 57101-1868
PO BOX 1869, SIOUX FALLS, SD 57101-1869
PO BOX 1870, SIOUX FALLS, SD 57101-1870
PO BOX 1871, SIOUX FALLS, SD 57101-1871
PO BOX 1872, SIOUX FALLS, SD 57101-1872
PO BOX 1873, SIOUX FALLS, SD 57101-1873
PO BOX 1874, SIOUX FALLS, SD 57101-1874
PO BOX 1875, SIOUX FALLS, SD 57101-1875
PO BOX 1876, SIOUX FALLS, SD 57101-1876
PO BOX 1877, SIOUX FALLS, SD 57101-1877
PO BOX 1878, SIOUX FALLS, SD 57101-1878
PO BOX 1879, SIOUX FALLS, SD 57101-1879
PO BOX 1880, SIOUX FALLS, SD 57101-1880
PO BOX 1881, SIOUX FALLS, SD 57101-1881
PO BOX 1882, SIOUX FALLS, SD 57101-1882
PO BOX 1883, SIOUX FALLS, SD 57101-1883
PO BOX 1884, SIOUX FALLS, SD 57101-1884
PO BOX 1885, SIOUX FALLS, SD 57101-1885
PO BOX 1886, SIOUX FALLS, SD 57101-1886
PO BOX 1887, SIOUX FALLS, SD 57101-1887
PO BOX 1888, SIOUX FALLS, SD 57101-1888
PO BOX 1889, SIOUX FALLS, SD 57101-1889
PO BOX 1890, SIOUX FALLS, SD 57101-1890
PO BOX 1891, SIOUX FALLS, SD 57101-1891
PO BOX 1892, SIOUX FALLS, SD 57101-1892
PO BOX 1893, SIOUX FALLS, SD 57101-1893
PO BOX 1894, SIOUX FALLS, SD 57101-1894
PO BOX 1895, SIOUX FALLS, SD 57101-1895
PO BOX 1896, SIOUX FALLS, SD 57101-1896
PO BOX 1897, SIOUX FALLS, SD 57101-1897
PO BOX 1898, SIOUX FALLS, SD 57101-1898
PO BOX 1899, SIOUX FALLS, SD 57101-1899
PO BOX 1900, SIOUX FALLS, SD 57101-1900
PO BOX 1901, SIOUX FALLS, SD 57101-1901
PO BOX 1902, SIOUX FALLS, SD 57101-1902
PO BOX 1903, SIOUX FALLS, SD 57101-1903
PO BOX 1904, SIOUX FALLS, SD 57101-1904
PO BOX 1905, SIOUX FALLS, SD 57101-1905
PO BOX 1906, SIOUX FALLS, SD 57101-1906
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