- 3 Hooker Co. (tin cans and stamping)
- 1 Hoopes & Townsend
- 1 Hoopes, Bro., & Darlington
- 1 Hoover Dam
- 14 Hoover, Herbert, 1874-1964
- 5 Hope
- 7 Hope Street
- 3 Hopkinson, Francis, 1737-1791
- 1 Hops
- 1 Horace B. Wikley Caterer, Oysters (Firm)
- 1 Horace Linton & Bro. (ribbon weaving)
- 36 Horace Trumbauer (Firm)
- 1 Horbury Mills (Mortimer)
- 3 Horn & Hardart Baking Co.
- 5 Horn & Hardart's Ice Cream
- 117 Hornbooks
- 2 Horne, Catherine, Clare, St. George, Foggo
- 11 Horne, R. H. (Richard H.), 1802-1884
- 1 Horner's Varnish Factory
- 1 Horns (Anatomy)
- 1 Horns (animal components)
- 1 Horrocks Street
- 3 Horse racetracks
- 1 Horse racing
- 5 Horse racing
- 117 Horse railroads
- 2 Horse teams
- 6 Horse troughs
- 104 Horseback riding
- 45 Horsecars
- 662 Horse-drawn vehicles
- 513 Horses
- 1 Horse's head (Sculpture)
- 2 Horsham, Pennsylvania
- 3 Horstmann's Manufactory
- 1 Horter Street
- 6 Horticultural buildings
- 1 Horticultural Drive
- 98 Horticultural Hall
- 9 Horticultural Hall (Broad Street)
