| POST OFFICE | ESTABLISHED | DISCONTINUED |
| Adams | 13 May 1873 | 15 May 1903 |
| Ardon | 23 Nov 1905 | 31 Mar 1954 |
| Atalissa - Formerly Overman's Ferry | 4 Apr 1856 | In Service |
| Bayfield | 5 Jun 1893 | 30 Dec 1895 |
| Bayfield re-established | 3 Mar 1898 | 31 Dec 1903 |
| Bloomington - Changed to Muscatine | 25 Sep 1837 | 26 Jun 1849 |
| Bower Landing - Formerly Fountain | 26 Feb 1858 | 8 Jun 1859 |
| Cedarville | 24 Mar 1838 | 4 Mar 1840 |
| Centre Grove - Changed to Durant | 12 Aug 1852 | 13 Feb 1857 |
| Conesville - Formerly Orono | 7 Jun 1870 | In Service |
| Cranston | 24 Jun 1905 | In Service |
| Durant - Formerly Centre Grove; Changed to be in Cedar County | 13 Feb 1857 | 14 Apr 1857 |
| Fairport - Formerly Wyoming | 29 Aug 1845 | 12 Jul 1945 |
| Fountain - Changed to Bower Landing | 14 Sep 1857 | 26 Feb 1858 |
| Fruitland | 23 Jun 1880 | In Service |
| Geneva - Formerly Vanderpool | 23 Apr 1838 | 22 Jun 1841 |
| Glen Dale | 1 Jun 1850 | 3 Jul 1851 |
| Iowa - Formerly in Des Moines County; Changed to Montpelier | 22 Nov 1837 | 4 Jan 1839 |
| Lacey (Lacy) | 15 Dec 1860 | 22 Aug 1871 |
| Melpine | 15 Nov 1847 | 16 Mar 1864 |
| Melpine re-established | 12 Sep 1865 | 29 Jul 1879 |
| Montpelier - Formerly Iowa | 4 Jan 1839 | 11 Feb 1846 |
| Montpelier re-established | 28 Feb 1882 | In Service |
| Moscow - Formerly in Dubuque County | 9 Oct 1839 | In Service |
| Muscatine - Formerly in Louisa County | 24 Feb 1841 | 16 Dec 1843 |
| Muscatine - Formerly Bloomington | 26 Jun 1849 | In Service |
| Myrtle | 22 Jun 1892 | 3 Jul 1899 |
| Nichol Station - Changed to Nichol | 14 Oct 1870 | 21 May 1883 |
| Nichol - Formerly Nichol Station; Changed to Nichols | 21 May 1883 | 20 Jun 1892 |
| Nichols - Formerly Nichol | 20 Jun 1892 | In Service |
| Orono - Changed to Conesville | 2 Aug 1861 | 7 Jun 1870 |
| Overman's Ferry - Formerly Powasheek; Changed to Atalissa | 30 Jan 1844 | 4 Apr 1856 |
| Pike | 6 Jan 1852 | 13 Jul 1860 |
| Pike re-established | 18 Oct 1860 | 21 Jul 1871 |
| Pine Mills | 6 Jan 1870 | 19 Aug 1873 |
| Pine Mills re-established | 3 Jul 1874 | 2 Feb 1882 |
| Pine Mills re-established | 6 Dec 1889 | 31 Jan 1901 |
| Pleasant Prairie | 10 Sep 1858 | 8 Mar 1867 |
| Pleasant Prairie re-established | 3 Jun 1868 | 9 Jan 1872 |
| Pleasant Prairie re-established | 21 Dec 1874 | 30 Jun 1902 |
| Port Allen - Formerly in Louisa County | 18 Apr 1883 | 17 Apr 1888 |
| Powasheek - Changed to Overman's Ferry | 23 Dec 1841 | 30 Jan 1844 |
| Prairie Mills - Changed to Stockton | 25 Jan 1858 | 26 Jun 1871 |
| Stockton - Formerly Prairie Mills | 26 Jun 1871 | In Service |
| Strawberry Hill | 20 Jan 1851 | 12 Sep 1861 |
| Summit | 19 Jun 1858 | 3 Aug 1863 |
| Summit re-established | 9 Sep 1863 | 22 Jul 1872 |
| Summitt Ridge | 12 May 1876 | 3 Sep 1879 |
| Sweetland - Formerly Sweetland Centre | 11 Nov 1851 | 1 Jan 1854 |
| Sweetland Centre - Changed to Sweetland | 14 Jun 1854 | 21 Jun 1883 |
| Vanderpool - Changed to Geneva | 31 Aug 1837 | 23 Apr 1838 |
| West Liberty | 24 Mar 1838 | In Service |
| Wilton Juction - Changed to Wilton | 14 Jul 1856 | 27 Feb 1972 |
| Wilton - Formerly Wilton Juction | 28 Feb 1972 | In Service |
| Wyoming - Changed to Fairport | 13 Feb 1838 | 29 Aug 1845 |
