April 4

— 1849 – Forestville incorporated. It dissolved back into the Town of Hanover on December 31, 2016.

— 1930 – Bemus Point High School formally opened.

— 1950 – Jamestown Telephone Company bought Central Chautauqua Telephone Company in Sinclairville.

April 5

— 1928 – C.H. Martin of Fredonia reported the find of diamond-like gems.

April 6

— 1860 – First mention of a fire extinguisher in a Jamestown newspaper.

April 7

— 1868 – 1 a.m., fire destroyed seven buildings in Sinclairville.

1910 – Jamestown High School senior class left for Washington, D.C. on first official senior class trip.

1913 – Voting machines used in every election district in Jamestown for the first time.