Franklinville is an unincorporated community and census-designated place in McHenry County, Illinois, United States. It was named a CDP before the 2020 census, at which time it had a population of 38.

The community is situated in the heart of Seneca Township at the junction of Franklinville Road (County Highway T-68) and Garden Valley-Perkins Road. A minor middle branch of the Kishwaukee River — called Franklinville Creek by some — crosses the community in a northeast-to-southwest direction. In terms of geographic coordinates, the community is located at 42°16′36″N 88°30′40″W / 42.27667°N 88.51111°W / 42.27667; -88.51111 (42.2766886, -88.5112025) In terms of the Public Land Survey System, Franklinville is divided between Sections 22 and 23, Township 44 North, Range 6 East of the Third Principal Meridian.

Historical population

Census	Pop.	Note	%±
2020	38		—
U.S. Decennial Census 2020

Franklinville first appeared as a census designated place in the 2020 U.S. Census.

Franklinville CDP, Illinois – Racial and ethnic composition
Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos may be of any race.

Race / Ethnicity (NH = Non-Hispanic)	Pop 2020	% 2020
White alone (NH)	33	86.84%
Black or African American alone (NH)	0	0.00%
Native American or Alaska Native alone (NH)	0	0.00%
Asian alone (NH)	0	0.00%
Pacific Islander alone (NH)	0	0.00%
Other race alone (NH)	0	0.00%
Mixed race or Multiracial (NH)	4	10.53%
Hispanic or Latino (any race)	1	2.63%
Total	38	100.00%

Franklinville is the site of the old Seneca Township Hall (built circa 1885) and the Franklinville cemetery. The modern office of Seneca Township is located approximately three-quarters of a mile west of the crossroads at 16506 Garden Valley Road (post office: Woodstock, IL 60098).

• Seneca Township