What is the city where coins marked "D" beside the president's head are made?

Denver, Colorado there are two mints in the US for legal tender. Denver and Philadelphia. all those coins by the "franklin mint" are worthless as money.

Denver Colorado

D= Denver

P= Philadelphia

S= Sacremento

Denver and Philadelphia.

Those from San Francisco (SF) are commemorative coins only

Denver - cool Mint tour if you're ever in the downtown area

"D" mint mark.....Denver branch 1906

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"P" mint mark ............Philadelphia branch

"S" mint mark............. San Francisco branch

"W" mint mark............ West Point branch

"CC" mint mark.......... Carson City

Larger denominations of gold and silver coins were labeled with

"C" mint mark.............Charlotte

"O" mint mark.............New Orleans

"D" mint mark.............Dahlonega ( town in Lumpkin County, Georgia)

The latter three were used between 1838 and 1839

Between 1965 and 1967, no American coins displayed mintmarks, in order to discourage the hoarding of coins by numismatists.

Yea, I know, all of the was more than you ever wanted to know

That would be Denver...at the US Mint there...

denver , colorado