Half Cents:
All Types:
( 1793-1857)
No Mint Marks - All minted in Philadelphia

Cents:
Flowing Hair:
(1793)
No Mint Marks - All minted in Philadelphia

Liberty Cap:
(1793-1796)
No Mint Marks - All minted in Philadelphia

Draped Bust:
(1796-1807)
No Mint Marks - All minted in Philadelphia

Classic Head:
(1808-1814)
No Mint Marks - All minted in Philadelphia

Coronet:
(1816-1857)
No Mint Marks - All minted in Philadelphia

Flying Eagle:
(1856-1858) -
No Mint Marks - All minted in Philadelphia

Indian Head:
(1859-1907)
No Mint Marks - All minted in Philadelphia
(1908-1909)
Philadelphia - No Mint Mark,
San Francisco - 'S' Mint Mark located under the Wreath on the reverse

Lincoln Wheat
(1909-1958)
Philadelphia - No Mint Mark,
Denver - 'D' Mint Mark located under the Date on obverse,
San Francisco - S Mint Mark located under the Date on obverse.

Lincoln Memorial
(1959-Present)
Philadelphia - No Mint Mark,
Denver - 'D' Mint Mark located under the Date on obverse,
San Francisco - 'S' Mint Mark located under the Date on obverse.

Two Cents:
All Types:
( 1864-1873)
No Mint Marks - All minted in Philadelphia

Three Cents Silver:
All Types:
( 1851-1873)
No Mint Marks - All minted in Philadelphia

Three Cents Nickel:
All Types:
( 1865-1889)
No Mint Marks - All minted in Philadelphia

Nickels:
Shield:
(1866-1883)
No Mint Marks - All minted in Philadelphia

Liberty Head:
(1883-1911)
No Mint Marks - All minted in Philadelphia

(1912)
Philadelphia - No Mint Mark,
Denver - 'D' Mint Mark located under the Dot between UNITED and CENTS on reverse,
San Francisco - 'S' Mint Mark located under the Dot between UNITED and CENTS on reverse.

Indian Head / Buffalo:
(1913-1938)
Philadelphia - No Mint Mark,
Denver - 'D' Mint Mark located under FIVE CENTS on reverse,
San Francisco - 'S' Mint Mark located under FIVE CENTS on reverse.

Jefferson:
(1938-1942)
Philadelphia - No Mint Mark,
Denver - 'D' Mint Mark located to the right of the Building (Monticello) on reverse,
San Francisco - 'S' Mint Mark located to the right of the Building (Monticello) on reverse.

(1942-1945)
Philadelphia - 'P' Mint Mark located above the Dome on reverse,
Denver - 'D' Mint Mark located above the Dome on reverse,
San Francisco - 'S' Mint Mark located above the Dome on reverse.

(1946-1964)
Philadelphia - No Mint Mark,
Denver - 'D' Mint Mark located to the right of the Building (Monticello) on reverse,
San Francisco - 'S' Mint Mark located to the right of the Building (Monticello) on reverse.

(1965-1967)
No Mint Marks

(1968-1979)
Philadelphia - No Mint Mark,
Denver - 'D' Mint Mark located to the right of the Building (Monticello) on reverse,
San Francisco - 'S' Mint Mark located to the right of the Building (Monticello) on reverse.

(1980-present)
Philadelphia - 'P' Mint Mark located under the last digit of the Date on the obverse,
Denver - 'D' Mint Mark located under the last digit of the Date on the obverse,
San Francisco - 'S' Mint Mark located under the last digit of the Date on the obverse.

{moscomment}
To be continued...