He was not listed in the 1880 census with the other family members, therefore assuming he was born after 1880
California State Historical Landmarks in Sonoma County
NO. 981 ICARIA-SPERANZA COMMUNE - Icaria-Speranza was a Utopian community based on the writings of French philosopher Etienne Cabet. In 1881, at Cloverdale, French immigrant families led by the Dehay and Leroux families began their social experiment in cooperative living based on solidarity and depending on an agrarian economy. It lasted until 1886. Icaria-Speranza was the only Icarian Colony in California and the last of seven established throughout the United States. On this site stood the Icarian schoolhouse, deeded to the county in 1886. Location: W side of Asti Rd, 1.68 mi. N of Asti Post Office Rd, S of Cloverdale.
1930 census, Washington Twp, Sonoma Co., California
Walter G. Leroux, age 53, KS, France, IN
M. Belle, wife, age 45, WI, WI, WI
Walter B., son, age 17, CA