He died on June 08, 1943 in Lancaster, Coos, New Hampshire, United States
Sources
"New Hampshire Birth Records, Early to 1900," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FL5K-7XQ : 12 December 2014), Guernsey, 27 Dec 1858; citing Lancaster, Coos, New Hampshire, United States, Bureau of Vital Records and Health Statistics, Concord; FHL microfilm 1,000,942.
"United States Census, 1860", database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M7WL-5D4 : 30 December 2015), Hubert Guernsey in entry for Aaron Geurnsey, 1860.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHRF-HBX : 29 August 2017), Hubert H Guernsey in household of Aaron Guernsey, Lancaster, Coos, New Hampshire, United States; citing enumeration district ED 41, sheet 163C, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0762; FHL microfilm 1,254,762.
"New Hampshire Marriages, 1720-1920," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FDGQ-JR1 : 31 December 2014), Hubert J. Guernsey and Lizzie J. Woodward, 13 Nov 1884; citing reference 2:3XV1M8R; FHL microfilm 1,000,995.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M3YQ-N4Y : accessed 1 August 2018), Hubert J Guernsey, Lancaster Town (southwest part), Coos, New Hampshire, United States; citing enumeration district (ED) 267, sheet 8B, family 211, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,945.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MH8D-1DW : accessed 1 August 2018), Hubert Guernsey, Lancaster, Coos, New Hampshire, United States; citing ED 52, sheet 6B, line 66, family 166, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1007; FHL microfilm 1,821,007.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/X7NZ-Q44 : accessed 1 August 2018), Hubart J Gurney, Lancaster, Coos, New Hampshire, United States; citing enumeration district (ED) ED 36, sheet 4B, line 61, family 60, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1300; FHL microfilm 2,341,035.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VTMT-1PB : accessed 1 August 2018), Hubert Guernsey, Lancaster Town, Coos, New Hampshire, United States; citing enumeration district (ED) 4-50, sheet 10B, line 76, family 64, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 2285.
"New Hampshire Deaths and Burials, 1784-1949," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FDKR-YFD : 12 December 2014), Hubert James Guernsey, 08 Jun 1943; citing Lancaster, Coos, New Hampshire; FHL microfilm 2,295,401.