1206 Barryscourt Castle built by Philip de Barry
1807 Slatty and Belvelly Bridges built
1856 Old boys and girls national school built at Barryscourt Road.
1862 Railway line opened
1869 The foundation stone of the present St. Mary’s Parish Church was laid on Nov 4th 1869
1872 The present St. Mary’s Parish Church was consecrated on May 15th 1872
1875 Poor Servants of the Mother of God arrived, invited by Fr. Seymour
1879 Carrigtwohill branch of the Land League was formed
1897 Tenders sought in May for building of Tibbotstown Resevoir
1903 Tibbotstown Reservoir opened,  Contractors: E. & R. Lester, Plymouth. £23,000
1905 St. David’s Church opened`(Church of Ireland)
1920 Carrigtwohill RIC Barracks captured by IRA on January 3rd
1939 Creamery at Ballyrichard opened
1939 St. Aloysius’ College opened
1947 Muintir na Tíre set up in Carrigtwohill
1952 New Muintir na Tire Hall opened and the first dance was held on December 2nd
1956 Scoil Mhuire Naofa (Boys National School) moved to present premises
1956 Scoil Chlochair Mhuire (Girls National School)
1961 Carrigtwohill Brach of the Irish Country Women’s Association was formed in October
1969 Atlantic Shellfish moved into Rossmore
1983 Credit Union opened for business on May 6th in Community Council Portacabin
1983 Fota Wildlife Park opened
1988 Millipore commenced production at their new plant in Tullagreine in January
1988 The Barryscourt Trust was formed with aim of preserving Barryscourt Castle
1988 Credit Union moved into new building in July
1989 Carrigtwohill Variety Group won Cork County Tops of the Communities on March 5th
1991 Community Centre extended with new sports hall/stage & kitchen
1991 Family Resource opened by St. Vincent de Paul
1991 Greenville House Autistic Centre opened by President Mary Robinson
1992 National Ploughing Championshps in Carrigtwohill
1994 Carrigtwohill By-pass was opened on November 14th
1998 The Well Lane and Park officially opened in June by Minister Noel Davern T.D.
2003 Children’s Playground behind the Community Centre opened at Christmas