2020 census As of the
2020 census, Shell Ridge had a population of 1,014. The population density was . The median age was 49.4 years; 23.6% of residents were under the age of 18, 4.4% were aged 18 to 24, 16.9% were aged 25 to 44, 31.2% were aged 45 to 64, and 24.0% were 65 years of age or older. For every 100 females, there were 100.0 males, and for every 100 females age 18 and over, there were 96.2 males age 18 and over. There were 377 housing units at an average density of . Of all housing units, 2.7% were vacant; the homeowner vacancy rate was 0.3% and the rental vacancy rate was 8.1%. Of the 367 occupied units, 90.7% were owner-occupied and 9.3% were occupied by renters. 100.0% of residents lived in urban areas, while 0.0% lived in rural areas.
2010 census Shell Ridge first appeared as a
census designated place in the
2010 U.S. census. ==Education==