J.T. Young
Petersburg, VA  c. 1855
Thomas You
Charleston, SC  1753-c. 1786
Alexander Young / A. Young & Co.
Baltimore, MD c. 1806-1807 and Camden, SC 1807-1856.  A branch
location was added in Columbia, SC c. 1845 under the name of
A. Young & Co. and operated by Young's son Edward, and was
closed when Edward died in 1848.
William P. Yates
Elmira, NY  c. 1841-1850  In the partnership of Yates & Kimball 1842-1843.  
Silversmith and jeweler.
Nicholas E. Young
Saratoga Springs, NY  1839-1846
York Silver Co.
New York, NY  c. 1950
C. Youngs
Bridgeport, CT  1824-1827
Silversmiths - Y
Levi Young / L. Young & Co.
Bridgeport, CT  1824-1827
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David Yurman, Inc.
New York, NY  1980-Present  Primarily a high end jewelery manufacturer.