Zarley, J.W. arrived in 1832 and served under Capt. G. Kercheval in the Chicago company during the Black Hawk War; was listed among “500 Chicagoans” on the census which Commissioner Thomas J.V. Owen took prior to the incorporation of Chicago as a town in early August 1833. [12, 319] 
Zender, Dr. from Paris, member of the Botanical Medical Society and of the Phrenological Society of New York; placed an ad in the Nov. 11, 1835, Chicago Democrat offering “his professional services in the practice of Medicine to the inhabitants of Chicago”; residing at the Exchange Coffee House, he “will pay particular attention to dyspepsia, consumptions, liver complaints, culaneous diseases, and fevers of every kind” or would provide a class in French or “lessons in the Greek, Latin or Spanish languages, Philosophy, &c.; &c.;”
Zeuch, Lucius H., M.D. Illinois physician and historian; author of History of Medical Practice in Illinois, Preceding 1850, which he finished in 1927, the year of his death; together with Robert Knight, he also authored Mount Joliet: Its Place in Illinois History and Its Location and The Location of the Chicago Portage Route of the 17th Century.  
Zimmerman Site the 1947 archaeological excavation site north of Utica, IL, where Father Marquette founded the Mission de la Conception at a Kaskaskia village in 1675; the location of several Illinois Indian settlements between 1673 and 1711.