1654, July 3. Calvert County formed by order in Council of Maryland. County originally encompassed most of Prince George's County, and parts of Anne Arundel and St. Mary's counties.
1669. Courthouse built by this date at Battle Town on north shore of Battle Creek.
c. 1680. Arthur Storer (c.1642-1686), America's first colonial astronomer, arrived in Calvert County from Lincolnshire, England.
1695. Prince George's County erected from parts of Charles and Calvert counties (Chapter 13, Acts of 1695, May session)
1731. First Courthouse under construction at Prince Frederick.
1732, Nov. 4. Thomas Johnson (1732-1819), Maryland’s first elected governor, born near St. Leonard’s Creek.
1749. Second Courthouse at Prince Frederick authorized.
1777, March 17. Roger Brooke Taney (1777-1864), Chief Justice, U.S. Supreme Court, and U.S. Attorney General, born in Calvert County.
1779, Jan. 14. Joseph Kent (1779-1837), Governor of Maryland, born in Calvert County.
1814, July 19. British burned Courthouse at Prince Frederick.
1814, June 26. Joshua Barney (1759-1818) commanded flotilla of barges and gunboats against British forces at Battle of the Barges, St. Leonard's Creek.
1814, July 4. British forces burned wharves and warehouses at Town of St. Leonard.
1814, Aug. 19 British fleet sailed up Patuxent River.
1819. Third Courthouse at Prince Frederick completed.
c.1870. Solomon's Island causeway built, connecting island to mainland.
1883. Drum Point Lighthouse erected at Solomons.
1884. Fourth Courthouse built at Prince Frederick.
1886. Chesapeake Beach incorporated.
1886, June 6. Charles Whitley lynched at Prince Frederick.
1897. Chesapeake Beach Railway linked Washington, DC, to Chesapeake Beach.
1910. North Beach incorporated.
1916. Fifth Courthouse at Prince Frederick completed.
1925. Chesapeake Biological Laboratory, Solomons Island, started as research station by Reginald V. Truitt.
1937, Dec. 27. Harriet Elizabeth Brown, represented by attorney Thurgood Marshall, won case against County Board of Education, ending teacher salary distinctions based on race.
1941. Patuxent Naval Air Test Center constructed.
1942. At Solomons, nation's first naval amphibious training base established.
1949. Slot machines allowed by law in Calvert County (Chapter 13, Acts of 1948 Special Session).
1950. Benedict Bridge opened across Patuxent River, connecting Calvert and Charles counties.
1963. Legislation passed to outlaw slot-machine gambling.
1964, Dec. 6. Tri-County Council for Southern Maryland created.
1969. Baltimore Gas and Electric Company began construction of Calvert Cliffs Nuclear Power Plant at Lusby.
1975, May. Calvert Cliffs Nuclear Power Plant began operation in Calvert County.
1977. Battle Creek Cypress Swamp leased to Calvert County as a public park.
1978, Jan. Governor Thomas Johnson Memorial Bridge opened across Patuxent River, connecting Calvert and St. Mary's counties.
2004, March 2. Electronic voting system used during primary elections at polling places and for absentee ballots in all counties and Baltimore City.
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