Whitcomb continued his untiring interest and devotion to Glendora for the next 30 years. The Whitcomb home was a center of activity during these years. Guests ranged from the Bovards of the newly established University of Southern California, to civic leaders from the city and county of Los Angeles and other parts of California, as well as business leaders from around the region and country. During those years, he was able to convince Glendorans to delay the incorporation of Glendora (est. 1911) until the Los Angeles County Board of Supervisors agreed to pave Foothill Boulevard and make several other civic improvements in the town using Los Angeles County funds.