Henry Clay Davis (July 12, 1845 – April 22, 1912) was a Washington State pioneer, pharmacist, real estate businessman, and speculator who lived in Tacoma and Claquato.

Davis experienced big losses, and eventually extracted himself from pharmaceutical business, focusing for several years on Tacoma real estate.

In later years, Davis kept making deals and investing in real estate in his native town, Claquato, located near Chehalis, Washington.

Henry was a pioneer of Washington State[9] and made big contributions in founding and developing Claquato town's infrastructure and layout.

[3] The drug-store was destroyed by fire three times, resulting in big losses for the owners, and eventually Davis left the business.

[2][1] After his terms as city treasurer, Davis entered the real estate business, working in the field for several years.

[3] During this time, he built the first-ever three-story brick building in Tacoma, and later rented it for "good profit.

At different times, he worked under the leadership of Arthur A. Denny, Washingtonian pioneer and one of Seattle's founders, and William Farrand Prosser, American politician, historian and Union Army colonel.

[17] He left an estate estimated at $110,000 ($170,000[note 1]), which was equally divided between his living family members: wife Ida and son Donald.