Here’s a listing of the top 100 most used fonts from the Fonts.com Web Fonts service for January 2014:

Trade Gothic
Neue Helvetica
Avenir Next
Univers
Avenir
Proxima Nova
Gill Sans
Frutiger
Futura
Helvetica
Linotype Univers
Museo Sans
Museo Slab
DIN Next
Century Gothic
Klint
Bree
Chaparral
Myriad
Rockwell
ITC Avant Garde Gothic
Arial
Univers Next
ITC Caslon No. 224
Eurostile LT
ITC Century
VAG Rounded
ITC Legacy Serif
Neo Sans
ITC Franklin Gothic
Neue Helvetica eText
ITC Lubalin Graph
Gill Sans Infant
Amasis
Optima
Motoya Birch
ITC Legacy Square Serif
Neue Frutiger
Swiss 721
Trade Gothic Next
ITC Officina Serif
ITC Charter
Soho Gothic
Sabon Next
Helvetica World
Frutiger Next
Linotype Sketch
Azbuka
ITC Officina Sans
Lexia
Bodoni LT
PMN Caecilia
ITC Conduit
Linotype Didot
Calibri
ITC Fenice
Bookman Old Style
Humanist 777
Delima
Trade Gothic Next Soft Rounded
Caslon Classico
ITC American Typewriter
Auriol
Monotype News Gothic
ITC American Typewriter Hellenic
Rotis Sans Serif
Adobe Garamond
Soho
Tempo
Bembo
ITC Stone Informal
Droid Sans Mono
Swift
Glypha
Neue Helvetica Arabic
Praxis
Brandon Grotesque
Novecento
Adobe Caslon
Sackers Gothic
Egyptienne F
Perpetua
Francker
Monotype Goudy
Baskerville Classico
ITC Eras
Droid Serif
Serpentine
Orator
Rotis II Sans
C Hei 2 PRC
Clarendon
Bodoni
M Elle PRC
C Hei PRC
M Lady PRC
M Stiff Hei PRC
Comic Strip
Inform
Gibson