| Floor plans for the new Eureka High School | Humboldt Times | MF 10 | 10/31/1913 | 6 | | Projects works | Eureka | Eureka, Eureka High School, J Street |
| Flyover of the airship Shenandoah | Humboldt Times | MF 10 | 10/18/1924 | 1 | | Flyover | | Airship, Shenandoah, U.S. Navy |
| Foot of water over 101 | Humboldt Times | MF 10 | 2/22/1927 | 11 cont from p.3 | | Flood damage | Brainerds Point Arcata Eel River | 101, Flood, Eel River |
| For $1010 the B.O.S. approved a warrant of $1010 to Hammond Lum. Co | The Humboldt Times | MF 10 | 10/10/1947 | 15 | 4 | Construction | McKinleyville | Warrant, Grant, Construction |
| For road project B.O.S used Road District Improvement Act as it pays half of the cost | Humboldt Times | MF 10 | 10/24/1924 | 9 | 3 | Road work | Miranda Salmon Creek | B.O.S. , Cost, Road District Improvement Act Of 1907, Bonding |
| For the first time in history, power from PG+E is now provided to 170 customers in the Mattole Valley. | The Humboldt Times | MF 10 | 2/27/1947 | 4 | 3 | Electricity | Mattole Valley | Power, Pg+E, History |
| Ford releases new info. on models of Model A | Humboldt Times | MF 10 | 12/2/1927 | 4 | | New car models | | Ford, Model A |
| Ford V8 | Humboldt Times | MF 10 | 8/5/1934 | 5 | 4--8 | Vehicle | | Vehicle, Newspaper Ad, For Sale, Ford V-8, Safety |
| Ford, Hupmobile | Humboldt Times | MF 10 | 7/5/1924 | 16 | | Vehicle | | Vehicle, Newspaper Ad, For Sale, Ford, Hupmobile |
| Forest Airplane Patrols Operates in Orleans District | Humboldt Times | MF 10 | 7/6/1920 | 3 | | Airplane Use | Orleans | Orleans, Airplane Patrol |
| Forest Service and Trinity county working on road to connect Weaverville with Burnt Ranch | Humboldt Times | MF 10 | 10/30/1909 | 1 | 3 | Road work | Weaverville Burnt Reach | Road, Connect Weaverville With Burnt Ranch, Forest Service |
| Forest Statistics of Humboldt County | Humboldt Times, Vacation Edition, Eureka Newspaper Inc. | MF 10 | 5/21/1952 | 7 | | Forest Statistics | Humboldt County | Forest Statistics, Humboldt County |
| Forestry Dept. trail | Humboldt Times | MF 10 | 9/15/1917 | 1 | 1 | Construction | Klamath River Terway Requa | Construction, Forestry Dept., Road, Grade, Survey, Bridge, State Highway, Engineers |
| Formal formation of Humboldt Airbase Committee occurred at C of C | Humboldt Times | MF 10 | 9/19/1940 | 2 | | Formation | Humboldt County | Formation, Humboldt Airbase Committee |
| Formal opening of Golden Gate Bridge | Humboldt Times | MF 10 | 1/28/1937 | 1 | 3 | Bridge opening | Golden Gate Bridge | Formal, Opening, Golden Gate Bridge |
| Formal Protests against the diversion of Eel | Humboldt Times | MF 10 | 4/23/1926 | 12 | 3 | Formal Protests | Eel | Eel, Formal Protests, |
| Former cannery in Trinidad being torn down | Humboldt Times | MF 10 | 9/24/1959 | 5 | 3 | Building remove | Trinidad Dock | Trinidad Dock, Cannery, Torn Down |
| Forset Fire destroyed 2 bridges | Humboldt Times | MF 10 | 9/12/1936 | 3 | | Fire damage | North of Crannel | Crannel, Forest Fire, 2 Bridges Destroyed |
| Fort Humboldt | Humboldt Times | MF 10 | 7/9/1939 | 2 | | Photo | Fort Humboldt | Fort Humboldt, Simpson, Mccutcheon |
| Fort Humboldt | Humboldt Times | MF 10 | 7/9/1939 | 2 | | Photo | Fort Humboldt | Fort Humboldt, Simpson, Mccutcheon |
| Fortuna Airport to get improvements | The Humboldt Times | MF 10 | 10/28/1939 | 3 | 8 | Airport Improvements | Fortuna Airport Sandy Prairie Road airfield | Fortuna Airport, Improvements, Hangar |
| Fortuna businessman feel Devoy Field is not good for airport | Humboldt Times | MF 10 | 4/4/1929 | 12 | 3 | Land Use | Devoy Field | Devoy Field, Businessman Fortuna, Airport |
| Fortuna Lighting Company busy wiring city for electricity | Humboldt Times | MF 10 | 10/27/1904 | 5 | 4 | Wiring city | Fortuna Rohnerville | Fortuna Lighting Company, Wiring, Electricity |
| Foundation poured for new HSU dormitory | The Humboldt Times | MF 10 | 11/17/1939 | 3 | 2 & 3 | New building | Humboldt State College | Foundation, Hsu, Dormitory |
| Founding of Eureka | Humboldt Times | MF 10 | 5/7/1950 | 5 | | Photos | Eureka | Eureka |
| Four cabins and house burned | The Humboldt Times | MF 10 | 11/14/1939 | 7 | | Fire | Stafford or Brown's Mill | Bruned, Brown'S Mill, |
| Four county group will battle Trinity diversion | Humboldt Times | MF 10 | 7/29/1950 | | | Land use | Trinity River | Trinity River Diversion, Engle- Scudder Canal Bill |
| Four early 1885 circa photos are at top of page | The Humboldt Times | MF 10 | 12/8/1946 | 1 | | Photos and article | Elinor Fruitland Sausalito | Historical, Transportation, Photos |
| four earthquakes | Humboldt Times | MF 10 | 8/30/1955 | 1 | | Earthquakes | | Humboldt County, Earthquakes |
| Four Indian arrow trees described at meeting | Humboldt Times | MF 10 | 1/6/1937 | 10 | 3 | Meeting | Veterans Mem. Building | Indian, Arrow Trees , Described, Meeting |
| Four Photos | Humboldt Times | MF 10 | 7/16/1922 | 9 | | Photos | Merryman's Hotel Clam Beach Moonstone Beach | Photos, Merryman'S Hotel, Beach |
| Four photos of Mad River Dam site | Humboldt Times | MF 10 | 10/24/1935 | 3 | 3 - 6 | Photos | Mad River dam | Photos, Mad River, Dam Site |
| Four Photos of the highway north of Eureka | Humboldt Times | MF 10 | 10/9/1921 | 9 | | Photos | Eureka | Highway North, Eureka |
| Fourth barge added for hauling rock | The Humboldt Times | MF 10 | 8/29/1916 | 1 | 3 | Delivers | Jacoby Creek Quarry Jetty | Fourth Barge, Rock Haul, Jetty |
| FPC granted permit to Electre Metals of S.F. | Humboldt Times | MF 10 | 8/14/1924 | 1 | 5 | Legal Notices | Klamath RIver | Klamath, Electre Metals |
| Frank Asbill murder trial opens | Humboldt Times | MF 10 | 9/17/1936 | 3 | | Murder Trial | Garberville | Garberville, Murder Trial, Frank Asbill |
| Frank Bartlett drowned in Salt River | Daily Times | MF 10 | 6/3/1883 | 3 | 1 | Death report | Salt River Port Kenyon | Port Kenyon, Frank Bartlett |
| Frank Kelly has completed a survey of the Centerville Beach Project | The Humboldt Times | MF 10 | 12/25/1947 | 8 | 2 | Survey report | Centerville | Survey, Beach, Project |
| Frank Kelly, co-surveyor, said the work of surfacing the road from Arcata to Samoa is almost completed | Humboldt Times | MF 10 | 10/10/1934 | 5 | 6 | Construction update | Arcata Samoa | Surfacing, Road, Construction |
| Frank L. Smith and crew on route to Eureka | Humboldt Times | MF 10 | 10/9/1913 | 6 | 14 | Travel | South Fork Trinity Blue Lake Eureka | Frank L. Smith, New Bridges, Route |
| Frank Longford died | The Humboldt Times | MF 10 | 10/29/1925 | 3 | 2 | Death report | Ishi Pishi Orleans | Frank Longford, Water Power Scheme, Electro Metals Company |
| Frank M. Asbill & Louis Goutieres sold land on Trinity | Daily Times | MF 10 | 1/18/1883 | 3 | 1 | Land sale | Trinity River | Trinity River, Frank M. Asbill, Louis Goutieres |
| Frank Pool & Master Bell hunting | Weekly Humboldt Times | MF 10 | 8/28/1902 | 4 | 2 | Hunting | Coyote Camp Trinidad Big Lagoon | Coyote Camp, Hunting |
| Frank T. Georgeson died | Humboldt Times | MF 10 | 10/29/1953 | 7 | | Obituary | Eureka | Obituary, Frank T. Georgeson |
| Frank Workman duties terminated by BOS | Humboldt Times | MF 10 | 7/1/1959 | 15 | | Terminated position | Big Lagoon Park | Frank Workman, Big Lagoon Park |
| Fred Bair sold his ranch to Dr. C.G. Wiggins | Humboldt Times | MF 10 | 7/26/1931 | 1 & 9 | | Land sale | Pasadena Maple Creek ranch | Fred Bair, Dr. C.G. Wiggins |
| Fred Hartsook is now at Deer Lodge | Humboldt Times | MF 10 | 5/6/1925 | 5 | 4 | Site details | L.A. Deer Lodge | Construction, Hotel, Ranch |
| Fred Lundblade is finishing building at Grotto & F | Humboldt Times | MF 10 | 11/4/1949 | 20 | | New building | Eureka | Fred Lundblade, Building, Grotto & F |
| Fred Mauer awarded contract by B.O.S. | The Humboldt Times | MF 10 | 9/16/1932 | 12 | 2 | Legal Notice | Mad River Slough Samoa | Fred Mauer, Contract, Awarded, Bridge |
| Fred Smythe purchased all equip from Overland Auto Company | Morning Daily Humboldt Times | MF 10 | 6/25/1910 | 1 | 3 | Purchase | Cummings Harris Bryan's Bluff | Fred Smythe, Overland Auto Company, Mail, Equip. |
