| 12c. | Castell Cadwgan, earth and timber castle built on the coast |
| 15c. | Cywydd (poem) by Lewis Glyn Cothi mentions Aberaeron |
| 1565 | Aberaeron mentioned in a survey of the coast |
| 1693 | First surviving entry in Court Leet records of Manor of Llyswen (next is 1774) |
| 1748 | Chart of the coast by Lewis Morris doesn’t show Aberaeron |
| 1757 | Aberaeron Uchaf (Dolau Aeron) built by Lewis Gwynne. Closed c 1815, rebuilt 1852 |
| 1769 | Earliest known reference by a visitor to an Inn at Aberaeron |
| 1770 | Turnpike Trust formed. Presumably a toll gate was erected shortly afterwards |
| 1774 | Court Leet (the council of the Manor of Llyswen) records complete to late 19th century |
| 1783 | Upper Bridge built 15 yards from the old one |
| 1785 | Aberaeron Benefit Society formed |
| 1801 | Chart of the coast by William Morris shows Aberaeron |
| 1807 | Act of Parliament enabling Rev. Alban Thomas Jones Gwynne to improve the harbour |
| 1807 | Harbourmaster Hotel built |
| 1809 | First Pier complete |
| 1811 | Second Pier complete |
| 1811 | Crescent of four houses (Mynachdy Row – Bedlam Barracks) built just north of the Harbour mouth |
| 1813 | Storm damaged the new piers |
| 1813 | New Lower bridge built (rebuilt 1881-2) |
| c. 1815 | The Feathers hotel built by William Lewes of Llanaeron |
| c. 1815 | Pengarreg House built by John Atwood, son-in-law of Rev. A.T.J. Gwynne (presumably earlier if it was built before the road) |
| 1818 | School (Ysgol-Glan y-môr) built on the shore just north of the Harbour mouth |
| 1819 | Rev. A.T.J. Gwynne died |
| 1830 | Colonel Alban Thomas Jones Gwynne succeeded his mother to the estate |
| c. 1830 | Post Office established in the town |
| 1833 | Tabernacl (Calvinistic Methodists) built (enlarged 1869) |
| 1833 | Peniel Chapel (Congregationalists) built (remodelled 1857, 1897) |
| 1835 | Trinity Chapel built (now Holy Trinity Church); Edward Haycock architect (rebuilt 1872) |
| 1839 | Workhouse {now Aberaeron Hospital) built |
| 1840s | Northern Pier extended to the north |
| 1844 | Town Hall (for magistrates), market and gaol built |
| 1845 | Tithe survey and map |
| 1848 | National School established |
| 1861 | Col Alban Thomas Jones Gwynne died |
| 1863 | Aberayron Steam Navigation Company was formed (existed until 1876) |
| 1864 | Salem chapel (Wesleyan Methodists) built (Roman Catholic church 1997) |
| 1866 | Act enabling Aberaeron to have gas lighting |
| 1872 | British School built (behind Portland Place) |
| 1872 | National School opened (now Freemasons’ Lodge) |
| 1872 | Chalybeate Well discovered |
| 1872 | Holy Trinity rebuilt (chancel rebuilt 1897) |
| 1877 | The Aberayron Steam Packet Company, formed, (existed until about 1918) |
| 1878 | Siloam Chapel (Baptists) built (now carpet warehouse) |
| 1881 | Lower Bridge damaged in a flood and rebuilt |
| 1881 | Aerial railway crossed the harbour. Closed about 1931; new one erected 1988, closed by 1990 |
| 1882 | Tennis Club formed |
| 1884 | Last ship, the Cadwgan, to be built in the harbour |
| 1888 | Aberaeron became the County Town |
| 1892 | 20th September. Aberaeron Urban and Rural Districts formed |
| 1898 | County School opened |
| 1909 | Work began on the new railway line to Aberaeron, opened in 1911 |
| 1911 | New Upper Bridge built to provide access to the new station |
| 1925 | Memorial Hall built |
| 1951 | Railway closed for passengers |
| 1965 | Last goods train left Aberaeron |
| 2007 | Bicentenary of 1807 Harbour Act |