| Infrastructure - General | Humboldt Times | MF 10 | 7/25/1939 | 5 | 3 | Oral History | Freshwater Park | Gillette, State Highway |
| Inspection to be done on Ruth Dam | Humboldt Times | MF 10 | 7/7/1961 | 3 | 4 | Inspection | Ruth Dam | Ruth Dam, Inspection, Bid |
| Instructions to start immediately on Life Saving Station | Daily Humboldt Times | MF 10 | 8/6/1878 | 3 | 1 | Building | Humboldt Bay Eureka | Life Saving Station, Mr. Mills |
| Interest in places of humboldt county | Weely Humboldt Times | MF 10 | 4/17/1902 | 2 | 8 | Deed | Johnston extension Big lagoon Ossian Creek | Deeds, Charles F. James , Robert D. Johnston, Big Lagoon, Place Mines, Ossian Creek |
| Introduction of Yellow Lupine to Samoa Peninsula | Humboldt Times | MF 10 | 7/17/1956 | 9 | N/A | History | Samoa San Francisco | Yellow Lupine, Genzoli, George C. Cobb, Dunes, Railroad, Theodora C. Cobb. |
| Involved in public lands fraud | Daily Times Telephone | MF 10 | 4/1/1886 | 2 | 1 | Editorial | | Editorial, Public Lands Fraud |
| Irwin Quinn former state senator | Humboldt Times | MF 10 | 4/21/1949 | 1 | | Person | | Irwin Quinn, State Senator |
| Issue is missing | Daily Humboldt Times | MF 10 | 9/3/1878 | | | issue | | |
| Italians having good luck fishing | Daily Times | MF 10 | 2/2/1883 | 3 | 1 | Fishing | Humboldt Bay | Italians, Fishing, Humboldt Bay |
| Items from Ferndale like strawberries | Daily Humboldt Times | MF 10 | 5/26/1878 | 3 | 1 | Items | Ferndale Eel river | Ferndale, Strawberries |
| J street | Humboldt Times | MF 10 | 12/24/1880 | | | Infrastructure-road | | J Street |
| J. N. Lentell has group of surveyors in field making survey for Humboldt & Eastern RR | Humboldt Times | MF 10 | 7/20/1910 | 1 | 7 | Survey work | Eureka Redding Trinity County | J.N. Lentell, Surveyors, Sell , Railroad, Trinity County |
| J.A. Genzoli died at 80 yrs old | Humboldt Times | MF 10 | 8/14/1958 | 15 | 6 | Death report | Bear River Bunker Hill | J.A. Genzoli Died |
| J.B. Foss lost his son on July 15 | Daily Humboldt Standard | MF 9 | 7/24/1908 | 3 | 2 | Death report | Stone Lagoon Arroyo Grande | J.B. Foss, Son Died, Pioneer Resident |
| J.B. Goodwin resigned | Humboldt Times | MF 10 | 7/30/1920 | 3 | 3 | Person Resigned | Trinidad | J.B. Goodwin, Whaling Station, Calif Sea Products |
| J.C. Bull Jr. will hold a celebration next Saturday. | The Humboldt Times | MF 10 | 12/13/1929 | 12 | 3 | Celebration | Arcata | Celebration, Company |
| J.E. Wheeler, W.B, W.E., E.L. and H.R. Mercereau purchased the 32,000 acres Big Lagoon Tract from C.A. Hooper | Daily Humboldt Standard | MF 9 | 7/13/1908 | 3 | 2 | Land sale | Big Lagoon Fruitvale | J.E. Wheeler, Purchase, Big Lagoon Tract, C.A. Hooper, |
| J.F. Ball Stud Mill burned down | Humboldt Times | MF 10 | 9/25/1956 | 1 | 4 | Fire | J.F. Ball Stud mill | J.F. Ball Stud Mall, Burned |
| J.N. Lentell has surveyed route for the Humboldt-Electric Railroad | Humboldt Times | MF 10 | 10/27/1909 | 1 | 7 | Railroad work | Trinidad National Forest | Trinidad National Forest, Humboldt Electric Railroad |
| J.N. Lentell proposed a route for a RR that would run east all the way to Winnemucca, Nevada | The Humboldt Times | MF 10 | 11/29/1946 | 1 | 8 | Proposal | Nevada | Railroad, Route, Pacific |
| J.N. Lentell, C.E., printed new map of Humboldt county | Humboldt Times | MF 10 | 5/1/1909 | 5 | 5,6 | New Map | Humboldt county Eureka | J.N. Lentell, C.E., New Map, Humboldt County |
| J.N. Lentell, surveyor progressing eastward along Trinity Road routes | The Humboldt Times | MF 10 | 9/14/1907 | 4 | 2 | Survey work | Trinity road routes | Surveyor, J.L. Lentell, Trinity Road Routes |
| J.S. Murray awarded contract for maps | Daily Humboldt Times | MF 10 | 8/8/1878 | 3 | 2 | Map Contract | Humboldt County | J.S. Murray, Map Contract, Map Entire County |
| J.W. Kerr sold lot to L.C. Tuttle | Weely Humboldt Times | MF 10 | 1/23/1902 | 3 | 6 | Land sale | | J.W. Kerr, L.C. Tuttle |
| Jack Gates | Humboldt Times | MF 10 | 9/3/1917 | 5 | 7 | Burial | Fortuna Indianola | Burial, Indian, Person, Community |
| Jack Gates passed away yesterday and will be buried tomorrow | Humboldt Times | MF 10 | 9/3/1917 | 5 | 7 | Obituary | Indianola | Passed Away, Indian |
| Jack Mckellar & Ronald Gensaw wen race | Humboldt Times | MF 10 | 7/16/1950 | | | Race | Klamath | Jack Mackellar & Ronald Gensaw, 176 Mile Race |
| Jack McKellar's diary & photos of trip | Humboldt Times | MF 10 | 9/16/1951 | 5 | | Diary & Photos | Colorado River | Jack Mckellar, Colorado River |
| Jack McKellar's run down the Colorado River | Humboldt Times | MF 10 | 9/16/1951 | 2,5 | | Rivers | | Rivers |
| Jacob Oscar Showers died yesterday at his home | Weely Humboldt Times | MF 10 | 1/23/1902 | 4 | 5 | Death report | Elk river Eureka | Elk River, Jacob Oscar Showers , Death |
| Jacoby Creek School will open soon | Humboldt Times | MF 10 | 9/1/1957 | 13 | | School Opening | Jacoby Creek School | Open, Jacoby Creek School |
| Jam Charley of Big Lagoon | Humboldt Times | MF 10 | 7/26/1918 | 5 | | Death report | Big Longan | Jam Charley, Big Longan, Hammond Lumber Company |
| James Becker Smith died @ age 53 | Humboldt Times | MF 10 | 9/17/1950 | 3 | | Death report | Park Street | James Becker Smith |
| James Buchanan and William McKeown spent sunday at Big Lagoon. | Humboldt Times | MF 10 | 7/3/1925 | 7 | 3 | | Big Lagoon | Big Lagoon |
| James E. Boots died on Gold Beach | Humboldt Times | MF 10 | 9/12/1963 | 1 | 3 | Death report | Gold Beach Petrolia | Died, Gold Beach, Car, Stuck |
| James McGinnis of Eureka was burned to death | The Humboldt Standard | MF 9 | 10/8/1945 | 1 | 7 | Death | Eureka Big Lagoon | Fire, Death |
| James McGrath wrote letter say that road on North Spit be extended | Humboldt Times | MF 10 | 6/15/1932 | 2 | 3 | Letter | North Spit Fairhaven | James Mcgrath, Letter, Recommending, Road, Extended |
| James Simpson has all subcontracts for 2nd story of new courthouse | Daily Times Telephone | MF 10 | 3/18/1886 | 3 | 1 | Subcontracts | | James Simpson, New Courthouse, John Dupoy |
| James William Henderson died | Humboldt Times | MF 10 | 7/14/1910 | 1 | 7 | Death report | Spanish Bar | Spanish Bar, James William Henderson |
| Janes creek mill shut down | Weekly Humboldt Times | MF 10 | 1/26/1888 | 3 | | Mill closing | Janes Creek | Janes Creek Mill |
| Jarnagan's Place, Mad River, Elk River | Weekly Times | MF 10 | 7/3/1880 | 3 | | New railroad | Freshwater slough | Freshwater Slough, J.H. Hendersons , Railroad |
| Jeems Pipes wrote letter about beach road, Price of lumber has dropped, lower wages and lays off | Weekly Times | MF 10 | 11/22/1879 | 3 | 3 | Letter, Low lumber price | Beach road Big surf Genterville | Jeems Pipes, Big Surf, Genterville, Price Of Lumber Dropped |
| Jerry James death | Humboldt Times | MF 10 | 4/3/1929 | 2 | 3 | Person | Bucksport Ocean View Cemetery | Jerry James |
| Jess Greenlaw is cutting down pepperwood trees on Elinor Flat | The Humboldt Times | MF 10 | 10/3/1961 | 9 | | RFD | Elinor Flat | Jess Greenlaw, Elinor Flat |
| Jetties | Humboldt Times | MF 10 | 8/2/1939 | 1 | 1 | Construction | Humboldt Bay South Jetty | South Jetty, Concrete, Humboldt Bay, Construction |
| Jetties | Humboldt Times | MF 10 | 8/2/1939 | 1 | 1 | Construction | Humboldt Bay South Jetty | South Jetty, Concrete, Humboldt Bay, Construction |
| Jetty road work to Commence Soon | Humboldt Times | MF 10 | 7/8/1920 | 5 | 5 | Road work | Samoa | Jetty Work, Samoa |
| Jimmy Gensaw died on Klamath at 108 years old | Humboldt Times | MF 10 | 4/18/1953 | 11 | 5 | Life history | Klamath | Jimmy Gensaw, Klamath, Died, Ran First Ferry |
| Job of filling on Clark street is happening | Daily Times | MF 10 | 5/24/1883 | 3 | 1 | Road work | | Clark Street |
| Job of Office of County Administrator set by Grand Jury | Humboldt Times | MF 10 | 3/28/1962 | 1 | 8 | Job position | | Grand Jury, B.O.S., Administrative Assistant, Creation, Office Of County Administrator |
